### Install PyAV from source

Source: https://pyav.org/docs/stable/_sources/overview/installation.rst.txt

Force installation from source to use a custom build of FFmpeg.

```bash
pip install av --no-binary av
```

--------------------------------

### Install PyAV via pip

Source: https://pyav.org/docs/stable/_sources/overview/installation.rst.txt

The standard method to install PyAV using binary wheels from PyPI.

```bash
pip install av
```

--------------------------------

### Install dependencies on Ubuntu 18.04 LTS

Source: https://pyav.org/docs/stable/_sources/overview/installation.rst.txt

Install Python development headers and FFmpeg library components using apt-get.

```bash
# General dependencies
sudo apt-get install -y python-dev pkg-config

# Library components
sudo apt-get install -y \
    libavformat-dev libavcodec-dev libavdevice-dev \
    libavutil-dev libswscale-dev libswresample-dev libavfilter-dev
```

--------------------------------

### Install PyAV via Conda

Source: https://pyav.org/docs/stable/_sources/overview/installation.rst.txt

Alternative installation method using the conda-forge channel.

```bash
conda install av -c conda-forge
```

--------------------------------

### Open a device with av.open

Source: https://pyav.org/docs/stable/api/_globals.html

Example of opening a webcam device on OS X using the avfoundation format.

```python
>>> # Open webcam on OS X.
>>> av.open(format='avfoundation', file='0') 
```

--------------------------------

### Accessing a stream from a container

Source: https://pyav.org/docs/stable/api/stream.html

An example of opening a container and accessing the first video stream.

```python
>>> fh = av.open(video_path)
>>> stream = fh.streams.video[0]
>>> stream
<av.VideoStream #0 h264, yuv420p 1280x720 at 0x...>
```

--------------------------------

### VideoFrame.to_image(**kwargs)

Source: https://pyav.org/docs/stable/api/video.html

Gets an RGB PIL.Image of this frame. Any **kwargs are passed to VideoReformatter.reformat(). PIL or Pillow must be installed.

```APIDOC
## VideoFrame.to_image(**kwargs)

### Description
Gets an RGB PIL.Image of this frame. Any **kwargs are passed to VideoReformatter.reformat(). PIL or Pillow must be installed.

### Method
Method

### Parameters
- **kwargs** - Optional - Keyword arguments passed to VideoReformatter.reformat().

### Response
#### Success Response
- **image** (PIL.Image) - The RGB image representation of the frame.

```

--------------------------------

### Install FFmpeg dependencies on Mac OS X

Source: https://pyav.org/docs/stable/_sources/overview/installation.rst.txt

Use Homebrew to install required FFmpeg and pkg-config tools on macOS.

```bash
brew install ffmpeg pkg-config
```

--------------------------------

### Stream.start_time

Source: https://pyav.org/docs/stable/_sources/api/stream.rst.txt

The start time of the stream.

```APIDOC
## Stream.start_time

### Description
The start time of the stream.

### Type
- **int** or None

### Usage
Get the start time in stream time base units.
```

--------------------------------

### VideoFrame.to_ndarray(**kwargs)

Source: https://pyav.org/docs/stable/api/video.html

Gets a numpy array of this frame. Any **kwargs are passed to VideoReformatter.reformat(). Numpy must be installed. For pal8, an (image, palette) tuple will be returned, with the palette being in ARGB (PyAV will swap bytes if needed).

```APIDOC
## VideoFrame.to_ndarray(**kwargs)

### Description
Gets a numpy array of this frame. Any **kwargs are passed to VideoReformatter.reformat(). Numpy must be installed. For pal8, an (image, palette) tuple will be returned, with the palette being in ARGB (PyAV will swap bytes if needed).

### Method
Method

### Parameters
- **kwargs** - Optional - Keyword arguments passed to VideoReformatter.reformat().

### Response
#### Success Response
- **array** (numpy.ndarray) - The numpy array representation of the frame. For pal8, a tuple (image, palette) is returned.

```

--------------------------------

### Dynamic slicing with StreamContainer.get

Source: https://pyav.org/docs/stable/api/stream.html

Shows how to use the get method to select specific streams using positional arguments.

```python
# Get the first channel.
streams.get(0)

# Get the first two audio channels.
streams.get(audio=(0, 1))
```

--------------------------------

### Get canonical name for AudioFormat

Source: https://pyav.org/docs/stable/api/audio.html

Retrieves the canonical name of the sample format.

```python
>>> SampleFormat('s16p').name
's16p'
```

--------------------------------

### Get bytes per sample for AudioFormat

Source: https://pyav.org/docs/stable/api/audio.html

Retrieves the number of bytes per sample for a given audio format.

```python
>>> SampleFormat('s16p').bytes
2
```

--------------------------------

### Convert VideoFrame to RGB

Source: https://pyav.org/docs/stable/api/video.html

Use the to_rgb method to convert a frame to the rgb24 format. This example shows the default format and the result after conversion.

```python
>>> frame = VideoFrame(1920, 1080)
>>> frame.format.name
'yuv420p'
>>> frame.to_rgb().format.name
'rgb24'
```

--------------------------------

### Build PyAV from GitHub source

Source: https://pyav.org/docs/stable/_sources/overview/installation.rst.txt

Steps to clone the repository, set up the environment, and build PyAV.

```bash
# Get PyAV from GitHub.
git clone git@github.com:PyAV-Org/PyAV.git
cd PyAV

# Prep a virtualenv.
source scripts/activate.sh

# Install basic requirements.
pip install -r tests/requirements.txt

# Optionally build FFmpeg.
./scripts/build-deps

# Build PyAV.
make
# or
python setup.py build_ext --inplace
```

--------------------------------

### swr_init

Source: https://pyav.org/docs/stable/development/includes.html

Initializes the SwrContext after options have been set.

```APIDOC
## `swr_init`

### Description
Initializes the SwrContext after options have been set.

### Method
Function

### Signature
`int swr_init(struct SwrContext *s)`

### Parameters
- **s** (struct SwrContext*) - Required - The context to initialize.

### Return Value
- **int** - 0 on success, negative error code on failure.
```

--------------------------------

### Create a VideoFormat and access its name

Source: https://pyav.org/docs/stable/api/video.html

Shows how to instantiate a VideoFormat with the pixel format 'rgb24' and access its name attribute.

```python
>>> format = VideoFormat('rgb24')
>>> format.name
'rgb24'
```

--------------------------------

### sws_getColorspaceDetails

Source: https://pyav.org/docs/stable/development/includes.html

Gets the colorspace details from a SwsContext.

```APIDOC
## `sws_getColorspaceDetails`

### Description
Gets the colorspace details from a SwsContext.

### Method
Function

### Signature
`int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table, int *srcRange, int **table, int *dstRange, int *brightness, int *contrast, int *saturation)`

### Parameters
- **c** (struct SwsContext*) - Required - The context.
- **inv_table** (int**) - Required - Output inverse table.
- **srcRange** (int*) - Required - Output source range.
- **table** (int**) - Required - Output table.
- **dstRange** (int*) - Required - Output destination range.
- **brightness** (int*) - Required - Output brightness.
- **contrast** (int*) - Required - Output contrast.
- **saturation** (int*) - Required - Output saturation.

### Return Value
- **int** - 0 on success, negative error code on failure.
```

--------------------------------

### Build and Test PyAV Environment

Source: https://pyav.org/docs/stable/development/hacking.html

Commands to prepare the development environment, build dependencies, compile the project, and execute the test suite.

```bash
# Prep the environment.
source scripts/activate.sh

# Build FFmpeg.
./scripts/build-deps

# Build PyAV.
make

# Run the tests.
make test
```

--------------------------------

### swr_get_delay

Source: https://pyav.org/docs/stable/development/includes.html

Gets the delay in the resampler in terms of the given base.

```APIDOC
## `swr_get_delay`

### Description
Gets the delay in the resampler in terms of the given base.

### Method
Function

### Signature
`int64_t swr_get_delay(struct SwrContext *s, int64_t base)`

### Parameters
- **s** (struct SwrContext*) - Required - The context.
- **base** (int64_t) - Required - The base for the delay calculation.

### Return Value
- **int64_t** - The delay.
```

--------------------------------

### Initialize and Inspect a Codec

Source: https://pyav.org/docs/stable/api/codec.html

Demonstrates how to initialize a Codec object for decoding and inspect its attributes such as name, type, and encoder status.

```python
>>> codec = Codec('mpeg4', 'r')
>>> codec.name
'mpeg4'
>>> codec.type
'video'
>>> codec.is_encoder
False
```

--------------------------------

### AudioResampler.__init__

Source: https://pyav.org/docs/stable/api/audio.html

Constructor for AudioResampler. Initializes a resampler with target format, layout, and sample rate.

```APIDOC
## AudioResampler.__init__

### Description
Initializes an AudioResampler instance with the target audio format, channel layout, and sample rate.

### Method
Constructor

### Parameters
- **format** (AudioFormat) - Optional - The target format, or string that parses to one (e.g. "s16").
- **layout** (AudioLayout) - Optional - The target layout, or an int/string that parses to one (e.g. "stereo").
- **rate** (int) - Optional - The target sample rate.

### Returns
An AudioResampler instance.
```

--------------------------------

### sws_getCachedContext

Source: https://pyav.org/docs/stable/development/includes.html

Gets a cached SwsContext, reusing an existing one if possible.

```APIDOC
## `sws_getCachedContext`

### Description
Gets a cached SwsContext, reusing an existing one if possible.

### Method
Function

### Signature
`struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW, int srcH, enum AVPixelFormat srcFormat, int dstW, int dstH, enum AVPixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)`

### Parameters
- **context** (struct SwsContext*) - Required - Existing context to reuse.
- **srcW** (int) - Required - Source width.
- **srcH** (int) - Required - Source height.
- **srcFormat** (enum AVPixelFormat) - Required - Source pixel format.
- **dstW** (int) - Required - Destination width.
- **dstH** (int) - Required - Destination height.
- **dstFormat** (enum AVPixelFormat) - Required - Destination pixel format.
- **flags** (int) - Required - Scaling flags.
- **srcFilter** (SwsFilter*) - Required - Source filter.
- **dstFilter** (SwsFilter*) - Required - Destination filter.
- **param** (const double*) - Required - Scaling parameters.

### Return Value
- **struct SwsContext*** - The context, or NULL on failure.
```

--------------------------------

### Initialize a VideoFrame

Source: https://pyav.org/docs/stable/api/video.html

Create a new VideoFrame instance by specifying width, height, and pixel format.

```python
>>> frame = VideoFrame(1920, 1080, 'rgb24')
```

--------------------------------

### AudioFrame.to_ndarray

Source: https://pyav.org/docs/stable/api/audio.html

Converts the audio frame to a numpy array. Requires numpy to be installed.

```APIDOC
## AudioFrame.to_ndarray

### Description
Get a numpy array of this frame. Note: Numpy must be installed.

### Method
instance

### Signature
to_ndarray(**kwargs)

### Parameters
- **kwargs** - Optional - Additional keyword arguments for conversion.

### Returns
numpy.ndarray - The audio data as a numpy array.
```

--------------------------------

### VideoFrame.to_rgb(**kwargs)

Source: https://pyav.org/docs/stable/api/video.html

Gets an RGB version of this frame. Any **kwargs are passed to VideoReformatter.reformat().

```APIDOC
## VideoFrame.to_rgb(**kwargs)

### Description
Gets an RGB version of this frame. Any **kwargs are passed to VideoReformatter.reformat().

### Method
Method

### Parameters
- **kwargs** - Optional - Keyword arguments passed to VideoReformatter.reformat().

### Request Example
```
>>> frame = VideoFrame(1920, 1080)
>>> frame.format.name
'yuv420p'
>>> frame.to_rgb().format.name
'rgb24'
```

### Response
#### Success Response
- **frame** (VideoFrame) - The RGB version of the frame.

```

--------------------------------

### Create a VideoFrame with width, height, and format

Source: https://pyav.org/docs/stable/_sources/api/video.rst.txt

Creates a VideoFrame with the given width, height, and format. The format can be a VideoFormat instance or a string such as 'rgb24'.

```python
frame = VideoFrame(1920, 1080, 'rgb24')
```

--------------------------------

### swr_alloc

Source: https://pyav.org/docs/stable/development/includes.html

Allocates a new SwrContext.

```APIDOC
## `swr_alloc`

### Description
Allocates a new SwrContext.

### Method
Function

### Signature
`struct SwrContext *swr_alloc(void)`

### Parameters
None

### Return Value
- **struct SwrContext*** - The allocated context, or NULL on failure.
```

--------------------------------

### swr_alloc_set_opts

Source: https://pyav.org/docs/stable/development/includes.html

Allocates a SwrContext and sets the options for audio resampling.

```APIDOC
## `swr_alloc_set_opts`

### Description
Allocates a SwrContext and sets the options for audio resampling.

### Method
Function

### Signature
`struct SwrContext *swr_alloc_set_opts(struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate, int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate, int log_offset, void *log_ctx)`

### Parameters
- **s** (struct SwrContext*) - Optional - Existing context to reuse, or NULL to allocate a new one.
- **out_ch_layout** (int64_t) - Required - Output channel layout.
- **out_sample_fmt** (enum AVSampleFormat) - Required - Output sample format.
- **out_sample_rate** (int) - Required - Output sample rate.
- **in_ch_layout** (int64_t) - Required - Input channel layout.
- **in_sample_fmt** (enum AVSampleFormat) - Required - Input sample format.
- **in_sample_rate** (int) - Required - Input sample rate.
- **log_offset** (int) - Required - Log offset.
- **log_ctx** (void*) - Required - Log context.

### Return Value
- **struct SwrContext*** - The allocated context, or NULL on failure.
```

--------------------------------

### Build PyAV on Windows with custom FFmpeg path

Source: https://pyav.org/docs/stable/_sources/overview/installation.rst.txt

Specify the directory containing FFmpeg binaries when building on Windows.

```bash
python setup.py build --ffmpeg-dir=C:\ffmpeg
```

--------------------------------

### Dynamic slicing with keyword arguments

Source: https://pyav.org/docs/stable/api/stream.html

Demonstrates selecting streams using keyword arguments or dictionaries to specify stream types.

```python
# Get the first video channel.
streams.get(video=0)
# or
streams.get({'video': 0})
```

--------------------------------

### CodecContext.open

Source: https://pyav.org/docs/stable/api/codec.html

Opens the codec context, making it ready for encoding or decoding.

```APIDOC
## CodecContext.open

### Description
Opens the codec context, initializing the codec for use.

### Method
Instance method

### Parameters
- **strict** (bool) - Optional - If True, strict mode is enabled. Default is True.

### Returns
None
```

--------------------------------

### Get bits per sample for AudioFormat

Source: https://pyav.org/docs/stable/api/audio.html

Retrieves the number of bits per sample for a given audio format.

```python
>>> SampleFormat('s16p').bits
16
```

--------------------------------

### StreamContainer.get

Source: https://pyav.org/docs/stable/api/stream.html

Get a selection of Stream objects as a list. Supports positional int indices, lists/tuples of indices, and keyword arguments for stream types.

```APIDOC
## StreamContainer.get

### Description
Get a selection of Stream as a list. Positional arguments may be int (index into streams) or list/tuple of those. Keyword arguments (or dicts) are interpreted as (stream_type, index_value_or_set) pairs. Stream objects are passed through untouched. If nothing is selected, all streams are returned.

### Method
N/A (Python method)

### Parameters
#### Positional Arguments
- **streams** (int, list, tuple, dict) - Optional - Selection of streams by index or type.

#### Keyword Arguments
- **video** (int, list, tuple) - Optional - Select video streams by index or indices.
- **audio** (int, list, tuple) - Optional - Select audio streams by index or indices.
- **subtitles** (int, list, tuple) - Optional - Select subtitle streams by index or indices.
- **data** (int, list, tuple) - Optional - Select data streams by index or indices.

### Returns
- **list** of Stream - The selected streams.

### Examples
```python
# Get the first channel.
streams.get(0)

# Get the first two audio channels.
streams.get(audio=(0, 1))

# Get the first video channel.
streams.get(video=0)
# or
streams.get({'video': 0})
```
```

--------------------------------

### Use av.open as context manager

Source: https://pyav.org/docs/stable/_sources/overview/caveats.rst.txt

Use the container as a context manager to ensure it is closed automatically, avoiding garbage collection issues in tight loops. This is recommended until reference cycles are resolved.

```python
with av.open(path) as fh:
    # Do stuff with it.
```

--------------------------------

### CodecContext.create

Source: https://pyav.org/docs/stable/api/codec.html

Static method to create a new CodecContext instance for a given codec and mode.

```APIDOC
## CodecContext.create

### Description
Creates a new CodecContext instance for the specified codec and mode.

### Method
Static method

### Parameters
- **codec** (Codec) - Required - The codec to use.
- **mode** (str) - Optional - The mode, either 'r' for read (decode) or 'w' for write (encode).

### Returns
CodecContext - The newly created context.
```

--------------------------------

### Accessing streams from a container

Source: https://pyav.org/docs/stable/api/stream.html

Demonstrates various ways to retrieve streams from a container, including indexing and filtering by type.

```python
# There are a few ways to pulling out streams.
first = container.streams[0]
video = container.streams.video[0]
audio = container.streams.get(audio=(0, 1))
```

--------------------------------

### sws_getContext

Source: https://pyav.org/docs/stable/development/includes.html

Creates a SwsContext for image scaling and format conversion.

```APIDOC
## `sws_getContext`

### Description
Creates a SwsContext for image scaling and format conversion.

### Method
Function

### Signature
`struct SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat, int dstW, int dstH, enum AVPixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)`

### Parameters
- **srcW** (int) - Required - Source width.
- **srcH** (int) - Required - Source height.
- **srcFormat** (enum AVPixelFormat) - Required - Source pixel format.
- **dstW** (int) - Required - Destination width.
- **dstH** (int) - Required - Destination height.
- **dstFormat** (enum AVPixelFormat) - Required - Destination pixel format.
- **flags** (int) - Required - Scaling flags.
- **srcFilter** (SwsFilter*) - Required - Source filter.
- **dstFilter** (SwsFilter*) - Required - Destination filter.
- **param** (const double*) - Required - Scaling parameters.

### Return Value
- **struct SwsContext*** - The context, or NULL on failure.
```

--------------------------------

### swresample_configuration

Source: https://pyav.org/docs/stable/development/includes.html

Returns the configuration string of the libswresample library.

```APIDOC
## `swresample_configuration`

### Description
Returns the configuration string of the libswresample library.

### Method
Function

### Signature
`const char *swresample_configuration(void)`

### Parameters
None

### Return Value
- **const char*** - The configuration string.
```

--------------------------------

### swscale_configuration

Source: https://pyav.org/docs/stable/development/includes.html

Returns the configuration string of the libswscale library.

```APIDOC
## `swscale_configuration`

### Description
Returns the configuration string of the libswscale library.

### Method
Function

### Signature
`const char *swscale_configuration(void)`

### Parameters
None

### Return Value
- **const char*** - The configuration string.
```

--------------------------------

### AudioFifo.write

Source: https://pyav.org/docs/stable/api/audio.html

Pushes a frame of audio samples into the FIFO buffer. The FIFO remembers attributes from the first frame and uses them for output frames.

```APIDOC
## AudioFifo.write

### Description
Push a frame of samples into the queue. The FIFO will remember the attributes from the first frame, and use those to populate all output frames. If there is a pts and time_base and sample_rate, then the FIFO will assert that the incoming timestamps are continuous.

### Method
instance

### Signature
write(frame)

### Parameters
- **frame** (AudioFrame) - Required - The frame of samples to push.

### Returns
None
```

--------------------------------

### av.open(file, mode='r', **kwargs)

Source: https://pyav.org/docs/stable/api/_globals.html

The av.open function is the main entrypoint for opening files or streams in PyAV. It accepts a file path or file-like object, a mode for reading or writing, and various optional parameters for format, options, and timeouts.

```APIDOC
## av.open(file, mode='r', **kwargs)

### Description
Main entrypoint to opening files/streams. This function is used to open media files or streams for reading or writing.

### Method
Function call

### Endpoint
av.open(file, mode='r', **kwargs)

### Parameters
#### Positional Parameters
- **file** (str) - Required - The file to open, which can be either a string or a file-like object.
- **mode** (str) - Optional - `"r"` for reading and `"w"` for writing. Defaults to `"r"`.

#### Keyword Parameters
- **format** (str) - Optional - Specific format to use. Defaults to autodetect.
- **options** (dict) - Optional - Options to pass to the container and all streams.
- **container_options** (dict) - Optional - Options to pass to the container.
- **stream_options** (list) - Optional - Options to pass to each stream.
- **metadata_encoding** (str) - Optional - Encoding to use when reading or writing file metadata. Defaults to `"utf-8"`.
- **metadata_errors** (str) - Optional - Specifies how to handle encoding errors; behaves like `str.encode` parameter. Defaults to `"strict"`.
- **buffer_size** (int) - Optional - Size of buffer for Python input/output operations in bytes. Honored only when `file` is a file-like object. Defaults to 32768 (32k).
- **timeout** (float or tuple) - Optional - How many seconds to wait for data before giving up, as a float, or a (open timeout, read timeout) tuple.

### Request Example
```python
# Open webcam on OS X.
av.open(format='avfoundation', file='0')
```

### Response
Returns a container object representing the opened file/stream.

### Notes
For devices (via `libavdevice`), pass the name of the device to `format`.

See also: Garbage Collection. More information on using input and output devices is available on the FFmpeg website.
```

--------------------------------

### OutputContainer.start_encoding

Source: https://pyav.org/docs/stable/api/container.html

Writes the file header. Called automatically.

```APIDOC
## OutputContainer.start_encoding

### Description
Write the file header. Called automatically.
```

--------------------------------

### VideoFrame.reformat(width=None, height=None, format=None, src_colorspace=None, dst_colorspace=None, interpolation=None)

Source: https://pyav.org/docs/stable/api/video.html

Creates a new VideoFrame with the specified width, height, format, and colorspace.

```APIDOC
## VideoFrame.reformat(width=None, height=None, format=None, src_colorspace=None, dst_colorspace=None, interpolation=None)

### Description
Creates a new VideoFrame with the given width, height, format, and colorspace. See VideoReformatter.reformat() for arguments.

### Method
Method

### Parameters
- **width** (int) - Optional - The new width.
- **height** (int) - Optional - The new height.
- **format** (VideoFormat or str) - Optional - The new format.
- **src_colorspace** (str) - Optional - The source colorspace.
- **dst_colorspace** (str) - Optional - The destination colorspace.
- **interpolation** (str) - Optional - The interpolation method.

### Response
#### Success Response
- **frame** (VideoFrame) - The reformatted video frame.

```

--------------------------------

### Initialize Python logging for PyAV

Source: https://pyav.org/docs/stable/api/utils.html

Initializes Python's logging system so PyAV can translate FFmpeg logs into Python logging. Use this if you are not already using Python's logging system.

```python
import logging
logging.basicConfig()

```

--------------------------------

### Calculating duration in seconds

Source: https://pyav.org/docs/stable/_sources/api/time.rst.txt

Shows how to calculate the duration of a video stream in seconds by multiplying the duration by the time_base.

```python
>>> video.duration
168
>>> float(video.duration * video.time_base)
6.72
```

--------------------------------

### VideoFrame(width, height, format)

Source: https://pyav.org/docs/stable/api/video.html

Creates a new video frame with the specified width, height, and pixel format.

```APIDOC
## VideoFrame(width, height, format)

### Description
Creates a new video frame with the specified dimensions and pixel format.

### Method
Constructor

### Parameters
- **width** (int) - Required - The width of the frame.
- **height** (int) - Required - The height of the frame.
- **format** (VideoFormat or str) - Required - The format of the frame.

### Request Example
```
>>> frame = VideoFrame(1920, 1080, 'rgb24')
```

### Response
#### Success Response
- **frame** (VideoFrame) - The newly created video frame.

```

--------------------------------

### swr_convert

Source: https://pyav.org/docs/stable/development/includes.html

Converts audio samples from one format to another using the SwrContext.

```APIDOC
## `swr_convert`

### Description
Converts audio samples from one format to another using the SwrContext.

### Method
Function

### Signature
`int swr_convert(struct SwrContext *s, uint8_t **out, int out_count, const uint8_t **in, int in_count)`

### Parameters
- **s** (struct SwrContext*) - Required - The context.
- **out** (uint8_t**) - Required - Output buffer.
- **out_count** (int) - Required - Number of output samples.
- **in** (const uint8_t**) - Required - Input buffer.
- **in_count** (int) - Required - Number of input samples.

### Return Value
- **int** - Number of samples output, or negative error code.
```

--------------------------------

### FilterContext.init

Source: https://pyav.org/docs/stable/api/filter.html

Initializes the filter context with arguments.

```APIDOC
## FilterContext.init

### Description
Initializes the filter context with arguments.

### Method
init

### Parameters
- **args** (optional) - Arguments for initialization.
- **kwargs** - Optional - Additional keyword arguments.

### Returns
None

```

--------------------------------

### Graph.configure

Source: https://pyav.org/docs/stable/api/filter.html

Configures the graph.

```APIDOC
## Graph.configure

### Description
Configures the graph.

### Method
configure

### Parameters
- **auto_buffer** (bool) - Optional - Whether to automatically add buffers.
- **force** (bool) - Optional - Force configuration.

### Returns
None

```

--------------------------------

### Codec.create()

Source: https://pyav.org/docs/stable/api/codec.html

Creates a CodecContext for this codec. This method is used to instantiate a context for encoding or decoding with the codec.

```APIDOC
## Codec.create()

### Description
Creates a CodecContext for this codec. This is the primary way to obtain a context for encoding or decoding.

### Returns
A CodecContext object.
```

--------------------------------

### VideoFrame.from_image(img)

Source: https://pyav.org/docs/stable/api/video.html

Constructs a frame from a PIL.Image.

```APIDOC
## VideoFrame.from_image(img)

### Description
Constructs a frame from a PIL.Image.

### Method
Static Method

### Parameters
- **img** (PIL.Image) - Required - The image to construct the frame from.

### Response
#### Success Response
- **frame** (VideoFrame) - The constructed video frame.

```

--------------------------------

### AudioFifo.read

Source: https://pyav.org/docs/stable/api/audio.html

Reads samples from the FIFO queue. Returns a new AudioFrame or None if empty.

```APIDOC
## AudioFifo.read

### Description
Read samples from the queue. Returns a new AudioFrame or None if empty. If the incoming frames had valid time_base, sample_rate and pts, the returned frames will have accurate timing.

### Method
instance

### Signature
read(samples=0, partial=False)

### Parameters
- **samples** (int) - Optional - The number of samples to pull; 0 gets all.
- **partial** (bool) - Optional - Allow returning less than requested.

### Returns
AudioFrame or None - New AudioFrame or None if empty.
```

--------------------------------

### swresample_license

Source: https://pyav.org/docs/stable/development/includes.html

Returns the license string of the libswresample library.

```APIDOC
## `swresample_license`

### Description
Returns the license string of the libswresample library.

### Method
Function

### Signature
`const char *swresample_license(void)`

### Parameters
None

### Return Value
- **const char*** - The license string.
```

--------------------------------

### Run Code Formatting and Linting

Source: https://pyav.org/docs/stable/development/hacking.html

Commands to execute isort and flake8 checks, which are required for code to be merged into the develop branch.

```bash
./scripts/test isort
./scripts/test flake8
```

--------------------------------

### Generate a synthetic video with PyAV and NumPy

Source: https://pyav.org/docs/stable/cookbook/numpy.html

Generates a 4-second MPEG-4 video (test.mp4) with 24 fps and 480x320 resolution. Creates synthetic RGB frames with sine-wave color patterns, converts them to VideoFrame objects, encodes them, and flushes the stream before closing the container.

```python
import numpy as np

import av


duration = 4
fps = 24
total_frames = duration * fps

container = av.open("test.mp4", mode="w")

stream = container.add_stream("mpeg4", rate=fps)
stream.width = 480
stream.height = 320
stream.pix_fmt = "yuv420p"

for frame_i in range(total_frames):

    img = np.empty((480, 320, 3))
    img[:, :, 0] = 0.5 + 0.5 * np.sin(2 * np.pi * (0 / 3 + frame_i / total_frames))
    img[:, :, 1] = 0.5 + 0.5 * np.sin(2 * np.pi * (1 / 3 + frame_i / total_frames))
    img[:, :, 2] = 0.5 + 0.5 * np.sin(2 * np.pi * (2 / 3 + frame_i / total_frames))

    img = np.round(255 * img).astype(np.uint8)
    img = np.clip(img, 0, 255)

    frame = av.VideoFrame.from_ndarray(img, format="rgb24")
    for packet in stream.encode(frame):
        container.mux(packet)

# Flush stream
for packet in stream.encode():
    container.mux(packet)

# Close the file
container.close()
```

--------------------------------

### OutputContainer.add_stream

Source: https://pyav.org/docs/stable/api/container.html

Creates a new stream in the output container and returns it. Requires a codec name and optionally a rate for video or audio.

```APIDOC
## OutputContainer.add_stream

### Description
Create a new stream in the output container and return it.

### Method
add_stream

### Parameters
- **codec_name** (str) - Required - The name of a codec.
- **rate** - Optional - The frame rate for video, and sample rate for audio. Examples for video include `24`, `23.976`, and `Fraction(30000,1001)`. Examples for audio include `48000` and `44100`.

### Returns
The new `Stream`.
```

--------------------------------

### Codec(name, mode='r')

Source: https://pyav.org/docs/stable/api/codec.html

Constructor for the Codec class. Creates a Codec object representing an available codec, with a name and mode ('r' for decoding, 'w' for encoding).

```APIDOC
## Codec(name, mode='r')

### Description
Creates a Codec object that exposes information about an available codec and provides a way to create a CodecContext for encoding or decoding.

### Parameters
- **name** (str) - Required - The codec name.
- **mode** (str) - Optional - 'r' for decoding or 'w' for encoding. Default is 'r'.

### Example
```python
>>> codec = Codec('mpeg4', 'r')
>>> codec.name
'mpeg4'
>>> codec.type
'video'
>>> codec.is_encoder
False
```
```

--------------------------------

### av.logging.adapt_level

Source: https://pyav.org/docs/stable/api/utils.html

Converts a library log level to a Python log level.

```APIDOC
## av.logging.adapt_level

### Description
Convert a library log level to a Python log level.

### Parameters
- **level** (int) - Required - The library log level to convert.
```

--------------------------------

### Generate a video barcode with PyAV and NumPy

Source: https://pyav.org/docs/stable/cookbook/numpy.html

Creates a video barcode by averaging each frame's columns and stacking them horizontally. Uses av.datasets.curated to fetch a sample video, decodes frames with container.decode(video=0), converts to rgb24 ndarray, and saves the result as barcode.jpg with quality=85.

```python
from PIL import Image
import numpy as np

import av
import av.datasets


container = av.open(
    av.datasets.curated("pexels/time-lapse-video-of-sunset-by-the-sea-854400.mp4")
)
container.streams.video[0].thread_type = "AUTO"  # Go faster!

columns = []
for frame in container.decode(video=0):

    print(frame)
    array = frame.to_ndarray(format="rgb24")

    # Collapse down to a column.
    column = array.mean(axis=1)

    # Convert to bytes, as the `mean` turned our array into floats.
    column = column.clip(0, 255).astype("uint8")

    # Get us in the right shape for the `hstack` below.
    column = column.reshape(-1, 1, 3)

    columns.append(column)

# Close the file, free memory
container.close()

full_array = np.hstack(columns)
full_img = Image.fromarray(full_array, "RGB")
full_img = full_img.resize((800, 200))
full_img.save("barcode.jpg", quality=85)
```

--------------------------------

### InputContainer Properties

Source: https://pyav.org/docs/stable/api/container.html

Properties of the InputContainer class: bit_rate, duration, size, and start_time.

```APIDOC
## InputContainer Properties

### Description
Properties of the InputContainer class.

### Properties
- **bit_rate** - The bit rate of the container.
- **duration** - The duration of the container.
- **size** - The size of the container.
- **start_time** - The start time of the container.
```

--------------------------------

### swscale_license

Source: https://pyav.org/docs/stable/development/includes.html

Returns the license string of the libswscale library.

```APIDOC
## `swscale_license`

### Description
Returns the license string of the libswscale library.

### Method
Function

### Signature
`const char *swscale_license(void)`

### Parameters
None

### Return Value
- **const char*** - The license string.
```

--------------------------------

### sws_freeContext

Source: https://pyav.org/docs/stable/development/includes.html

Frees a SwsContext.

```APIDOC
## `sws_freeContext`

### Description
Frees a SwsContext.

### Method
Function

### Signature
`void sws_freeContext(struct SwsContext *swsContext)`

### Parameters
- **swsContext** (struct SwsContext*) - Required - The context to free.

### Return Value
None
```

--------------------------------

### Compare default SLICE threading vs AUTO threading

Source: https://pyav.org/docs/stable/cookbook/basics.html

Decodes the same video twice: first with default SLICE threading, then with thread_type = "AUTO". Prints timing for both passes; the author reports AUTO decodes about 5 times faster.

```python
import time

import av
import av.datasets


print("Decoding with default (slice) threading...")

container = av.open(
    av.datasets.curated("pexels/time-lapse-video-of-night-sky-857195.mp4")
)

start_time = time.time()
for packet in container.demux():
    print(packet)
    for frame in packet.decode():
        print(frame)

default_time = time.time() - start_time
container.close()


print("Decoding with auto threading...")

container = av.open(
    av.datasets.curated("pexels/time-lapse-video-of-night-sky-857195.mp4")
)

# !!! This is the only difference.
container.streams.video[0].thread_type = "AUTO"

start_time = time.time()
for packet in container.demux():
    print(packet)
    for frame in packet.decode():
        print(frame)

auto_time = time.time() - start_time
container.close()


print("Decoded with default threading in {:.2f}s.".format(default_time))
print("Decoded with auto threading in {:.2f}s.".format(auto_time))

```