### Capture JACK Audio Input

Source: https://ffmpeg.org/ffmpeg-all.html

This example demonstrates capturing audio from a JACK audio server. It involves creating a JACK client, starting a source client (jack_metro), listing clients, and connecting them.

```bash
# Create a JACK writable client with name "ffmpeg".
$ ffmpeg -f jack -i ffmpeg -y out.wav

# Start the sample jack_metro readable client.
$ jack_metro -b 120 -d 0.2 -f 4000

# List the current JACK clients.
$ jack_lsp -c
system:capture_1
system:capture_2
system:playback_1
system:playback_2
ffmpeg:input_1
metro:120_bpm

# Connect metro to the ffmpeg writable client.
$ jack_connect metro:120_bpm ffmpeg:input_1

```

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

### DASH Adaptation Sets Configuration Example 2

Source: https://ffmpeg.org/ffmpeg-all.html

Example of configuring adaptation sets for DASH muxing, including trick mode streams.

```text
id=0,seg_duration=2,frag_type=none,streams=0 id=1,seg_duration=10,frag_type=none,trick_id=0,streams=1

```

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

### FFmpeg Loopback Decoder Example

Source: https://ffmpeg.org/ffmpeg-all.html

This example demonstrates reading an input video, encoding it at low quality, decoding the encoded stream using a loopback decoder, placing it side-by-side with the original video, and then losslessly encoding the combined video.

```bash
ffmpeg -i INPUT                                        \
  -map 0:v:0 -c:v libx264 -crf 45 -f null -            \
  -threads 3 -dec 0:0                                  \
  -filter_complex '[0:v][dec:0]hstack[stack]'          \
  -map '[stack]' -c:v ffv1 OUTPUT

```

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

### FFmetadata File Example

Source: https://ffmpeg.org/ffmpeg-all.html

An example of the ffmetadata file format, including global tags, chapter sections, and stream sections. Special characters and comments are demonstrated.

```text
;FFMETADATA1
title=bike\\shed
;this is a comment
artist=FFmpeg troll team

[CHAPTER]
TIMEBASE=1/1000
START=0
#chapter ends at 0:01:00
END=60000
title=chapter \#1
[STREAM]
title=multi\\nline

```

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

### WebM Live Chunk Muxer Example

Source: https://ffmpeg.org/ffmpeg-all.html

Configures FFmpeg to use the WebM Live Chunk Muxer for both video and audio streams. This example demonstrates setting up separate headers and chunk files for live DASH consumption.

```bash
ffmpeg -f v4l2 -i /dev/video0 \
       -f alsa -i hw:0 \
       -map 0:0 \
       -c:v libvpx-vp9 \
       -s 640x360 -keyint_min 30 -g 30 \
       -f webm_chunk \
       -header webm_live_video_360.hdr \
       -chunk_start_index 1 \
       webm_live_video_360_%d.chk \
       -map 1:0 \
       -c:a libvorbis \
       -b:a 128k \
       -f webm_chunk \
       -header webm_live_audio_128.hdr \
       -chunk_start_index 1 \
       -audio_chunk_duration 1000 \
       webm_live_audio_128_%d.chk

```

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

### FFmpeg Per-Stream AVOptions Example

Source: https://ffmpeg.org/ffmpeg-all.html

Configure per-stream AVOptions, such as codec and bitrate, using stream specifiers. This example encodes audio streams differently.

```bash
ffmpeg -i multichannel.mxf -map 0:v:0 -map 0:a:0 -map 0:a:0 -c:a:0 ac3 -b:a:0 640k -ac:a:1 2 -c:a:1 aac -b:2 128k out.mp4
```

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

### FFmpeg mpegts muxer example with custom IDs and PIDs

Source: https://ffmpeg.org/ffmpeg-all.html

This example demonstrates how to use the mpegts muxer with custom network, transport stream, and service IDs, as well as specific PMT and elementary stream PIDs. It also shows how to set metadata for service provider and service name.

```bash
ffmpeg -i file.mpg -c copy \
     -mpegts_original_network_id 0x1122 \
     -mpegts_transport_stream_id 0x3344 \
     -mpegts_service_id 0x5566 \
     -mpegts_pmt_start_pid 0x1500 \
     -mpegts_start_pid 0x150 \
     -metadata service_provider="Some provider" \
     -metadata service_name="Some Channel" \
     out.ts

```

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

### DASH Adaptation Sets Configuration Example 1

Source: https://ffmpeg.org/ffmpeg-all.html

Example of configuring adaptation sets for DASH muxing, specifying segment and fragment durations and types.

```text
id=0,seg_duration=2,frag_duration=1,frag_type=duration,streams=v id=1,seg_duration=2,frag_type=none,streams=a

```

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

### xstack_qsv filter example

Source: https://ffmpeg.org/ffmpeg-all.html

This example demonstrates the usage of the xstack_qsv filter for custom video stacking with specified input counts and layouts. Ensure the QSV device is correctly set up.

```ffmpeg
xstack_qsv=inputs=4:layout=0_0_1920x1080|0_h0_1920x1080|w0_0_1920x1080|w0_h0_1920x1080
```

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

### Colorspace Conversion Example

Source: https://ffmpeg.org/ffmpeg-all.html

Converts the input video to SMPTE-240M colorspace. Ensure input color properties are set correctly.

```bash
colorspace=smpte240m
```

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

### Create Video from Image Sequence Starting at Specific Number

Source: https://ffmpeg.org/ffmpeg-all.html

Create a video from an image sequence, beginning with a file that has a specific index number (e.g., starting from img-100.jpeg).

```bash
ffmpeg -framerate 10 -start_number 100 -i 'img-%03d.jpeg' out.mkv
```

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

### FFmpeg DTLS Server Example

Source: https://ffmpeg.org/ffmpeg-all.html

Command to configure FFmpeg as a DTLS server, listening for incoming connections on a specified host and port.

```shell
ffmpeg -listen 1 -i dtls://hostname:port output
```

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

### Capture Audio with ALSA

Source: https://ffmpeg.org/ffmpeg-all.html

Example command to capture audio from an ALSA device with card ID 0 and save it to alsaout.wav.

```bash
ffmpeg -f alsa -i hw:0 alsaout.wav
```

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

### Generate Solid Color Video

Source: https://ffmpeg.org/ffmpeg-all.html

This example uses the lavfi 'color' source to generate a 5-second video of a solid red color.

```bash
ffmpeg -filter_complex 'color=c=red' -t 5 out.mkv
```

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

### Set hue in radians and saturation to 1.0

Source: https://ffmpeg.org/ffmpeg-all.html

This example shows how to express the hue in radians instead of degrees while setting saturation.

```ffmpeg
hue=H=PI/2:s=1
```

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

### Set hue to 90 degrees and saturation to 1.0

Source: https://ffmpeg.org/ffmpeg-all.html

This example demonstrates setting the hue to a specific degree value and saturation to a fixed level.

```ffmpeg
hue=h=90:s=1
```

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

### Create Single Image File from Video Start

Source: https://ffmpeg.org/ffmpeg-all.html

Generate a single image file from the beginning of an input video using the image2 muxer.

```bash
ffmpeg -i in.avi -f image2 -frames:v 1 img.jpeg
```

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

### Initialize Vulkan device with instance extensions

Source: https://ffmpeg.org/ffmpeg-all.html

Selects the first Vulkan device and enables specified instance extensions.

```bash
-init_hw_device vulkan:0,instance_extensions=VK_KHR_wayland_surface+VK_KHR_xcb_surface
```

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

### 3:1 compression starting at -15dB

Source: https://ffmpeg.org/ffmpeg-all.html

Applies 3:1 audio compression starting at -15dB. This example specifically sets the transfer function points.

```ffmpeg
compand=points=-80/-80|-15/-15|0/-10.8|20/-5.2
```

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

### 2:1 compression starting at -18dB

Source: https://ffmpeg.org/ffmpeg-all.html

Applies 2:1 audio compression starting at -18dB. This example specifically sets the transfer function points.

```ffmpeg
compand=points=-80/-80|-18/-18|0/-9.8|20/0.7
```

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

### Initialize QSV device on Linux

Source: https://ffmpeg.org/ffmpeg-all.html

Creates a QSV device with MFX_IMPL_HARDWARE on a specified DRM render node.

```bash
-init_hw_device qsv:hw,child_device=/dev/dri/renderD129
```

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

### 2:1 compression starting at -12dB

Source: https://ffmpeg.org/ffmpeg-all.html

Applies 2:1 audio compression starting at -12dB. This example specifically sets the transfer function points.

```ffmpeg
compand=points=-80/-80|-12/-12|0/-6.8|20/1.9
```

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

### Initialize QSV device on Windows

Source: https://ffmpeg.org/ffmpeg-all.html

Creates a QSV device with MFX_IMPL_HARDWARE on a specified DirectX adapter.

```bash
-init_hw_device qsv:hw,child_device=1
```

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

### 2:1 compression starting at -9dB

Source: https://ffmpeg.org/ffmpeg-all.html

Applies 2:1 audio compression starting at -9dB. This example specifically sets the transfer function points.

```ffmpeg
compand=points=-80/-80|-9/-9|0/-5.3|20/2.9
```

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

### Initialize new hardware device from existing

Source: https://ffmpeg.org/ffmpeg-all.html

Initializes a new hardware device of a specified type and name, deriving it from an existing device.

```bash
-init_hw_device type[=name]@source
```

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

### 2:1 compression starting at -6dB

Source: https://ffmpeg.org/ffmpeg-all.html

Applies 2:1 audio compression starting at -6dB. This example specifically sets the transfer function points.

```ffmpeg
compand=points=-80/-80|-6/-6|0/-3.8|20/3.5
```

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

### FFmpeg DTLS Client Example

Source: https://ffmpeg.org/ffmpeg-all.html

Command to configure FFmpeg as a DTLS client, sending input data to a specified DTLS server address.

```shell
ffmpeg -i input -f format dtls://hostname:port
```

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

### Initialize OpenCL Device and Use avgblur_opencl Filter

Source: https://ffmpeg.org/ffmpeg-all.html

Example of initializing an OpenCL device and applying the avgblur_opencl filter. Requires uploading frames to hardware surfaces before filtering and downloading them afterward.

```bash
-init_hw_device opencl=gpu:1.0 -filter_hw_device gpu -i INPUT -vf "hwupload, avgblur_opencl, hwdownload" OUTPUT
```

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

### Apply saturation fade-out effect

Source: https://ffmpeg.org/ffmpeg-all.html

This example demonstrates applying a saturation fade-out effect over a specified duration, starting at a particular time.

```ffmpeg
hue="s=max(0\, min(1\, (8-t)/3))"
```

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

### FFmpeg fieldhint Hint File Example

Source: https://ffmpeg.org/ffmpeg-all.html

Specifies frame numbers for extracting top and bottom fields using relative mode. Lines starting with '#' or ';' are ignored.

```text
0,0 - # first frame
1,0 - # second frame, use third's frame top field and second's frame bottom field
1,0 - # third frame, use fourth's frame top field and third's frame bottom field
1,0 -
0,0 -
0,0 -
1,0 -
1,0 -
1,0 -
0,0 -
0,0 -
1,0 -
1,0 -
1,0 -
0,0 -
```

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

### Initialize Vulkan device by index

Source: https://ffmpeg.org/ffmpeg-all.html

Selects the second Vulkan device on the system.

```bash
-init_hw_device vulkan:1
```

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

### Initialize VAAPI and derive QSV device

Source: https://ffmpeg.org/ffmpeg-all.html

Creates a VAAPI device and then derives a QSV device from it.

```bash
-init_hw_device vaapi=va:/dev/dri/renderD129 -init_hw_device qsv=hw1@va
```

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

### FFmpeg silenceremove: Start recording without initial delay

Source: https://ffmpeg.org/ffmpeg-all.html

Use this to start a recording that omits the typical delay between pressing record and the actual performance start.

```bash
silenceremove=start_periods=1:start_duration=5:start_threshold=0.02
```

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

### Segment Start Time Accuracy

Source: https://ffmpeg.org/ffmpeg-all.html

Specify the accuracy for selecting segment start times. This is useful for aligning segment starts with keyframes, especially when combined with `force_key_frames`.

```ffmpeg
segment_time_delta 1/(2*frame_rate)
```

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

### Initialize QSV Hardware Device (Auto Any)

Source: https://ffmpeg.org/ffmpeg-all.html

Initializes a QSV hardware device, attempting to use any available implementation (hardware or software).

```ffmpeg
-init_hw_device qsv=auto_any
```

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

### Two-Pass Video Encoding (Windows)

Source: https://ffmpeg.org/ffmpeg-all.html

Example for the first pass of a two-pass video encoding process on Windows. Audio is deactivated and output is set to null.

```bash
ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
```

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

### DASH Descriptor Example

Source: https://ffmpeg.org/ffmpeg-all.html

Example of defining a descriptor for DASH adaptation sets using SupplementalProperty.

```xml
<SupplementalProperty schemeIdUri="urn:mpeg:dash:srd:2014" value="0,0,0,1,1,2,2"/>

```

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

### Initialize Vulkan device by name substring

Source: https://ffmpeg.org/ffmpeg-all.html

Selects the first Vulkan device with a name containing the specified substring.

```bash
-init_hw_device vulkan:RADV_
```

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

### Dehazing with guided filter using a guidance image

Source: https://ffmpeg.org/ffmpeg-all.html

Performs dehazing, structure-transferring filtering, or detail enhancement using the guided filter with a separate guidance image. Refer to the paper 'Guided Image Filtering' for guidance image generation.

```bash
ffmpeg -i in.png -i guidance.png -filter_complex guided=guidance=on out.png
```

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

### Initialize QSV Hardware Device (Software)

Source: https://ffmpeg.org/ffmpeg-all.html

Initializes a QSV hardware device, forcing the use of software implementation.

```ffmpeg
-init_hw_device qsv=sw
```

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

### Example filtergraph description for scale filter

Source: https://ffmpeg.org/ffmpeg-all.html

This is an example of a GRAPH_DESCRIPTION string for the scale filter, showing how to define inputs and outputs explicitly.

```text
nullsrc,scale=640:360,nullsink

```

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

### Initialize OpenCL device by index

Source: https://ffmpeg.org/ffmpeg-all.html

Selects the second device on the first OpenCL platform.

```bash
-init_hw_device opencl:0.1
```

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

### Edge-preserving smoothing with guided filter

Source: https://ffmpeg.org/ffmpeg-all.html

Applies the guided filter for edge-preserving smoothing to an input image. No additional guidance image is required.

```bash
ffmpeg -i in.png -vf guided out.png
```

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

### Initialize OpenCL GPU device with extension

Source: https://ffmpeg.org/ffmpeg-all.html

Selects a GPU device on the second platform that supports a specific OpenCL extension.

```bash
-init_hw_device opencl:1,device_type=gpu,device_extensions=cl_khr_fp16
```

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

### FFmpeg setpts: Start PTS from zero

Source: https://ffmpeg.org/ffmpeg-all.html

Resets the presentation timestamps (PTS) to start from zero for video frames. Useful for re-synchronizing timestamps.

```bash
setpts=PTS-STARTPTS
```

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

### Initialize QSV device on Windows with specific subdevice type

Source: https://ffmpeg.org/ffmpeg-all.html

Creates a QSV device with MFX_IMPL_HARDWARE on a specified DirectX adapter and subdevice type.

```bash
-init_hw_device qsv:hw,child_device=1,child_device_type=d3d11va
```

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

### FFmpeg Sobel Operator Example

Source: https://ffmpeg.org/ffmpeg-all.html

Applies the Sobel operator to the input video stream. This example demonstrates setting the scale to 2 and delta to 10.

```bash
-i INPUT -vf "hwupload, sobel_opencl=scale=2:delta=10, hwdownload" OUTPUT

```

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

### Show FFmpeg Build Configuration

Source: https://ffmpeg.org/ffmpeg-all.html

Displays the build configuration details of FFmpeg, with each option on a new line.

```bash
ffmpeg -buildconf
```

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

### FFmpeg blackframe filter example

Source: https://ffmpeg.org/ffmpeg-all.html

The blackframe filter detects frames that are almost completely black. This example uses default values for amount and threshold.

```bash
blackframe
```

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

### Initialize QSV Hardware Device (Hardware)

Source: https://ffmpeg.org/ffmpeg-all.html

Initializes a QSV hardware device, forcing the use of hardware acceleration.

```ffmpeg
-init_hw_device qsv=hw
```

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

### Initialize OpenCL device by name

Source: https://ffmpeg.org/ffmpeg-all.html

Selects an OpenCL device with a name containing the specified string.

```bash
-init_hw_device opencl:,device_name=Foo9000
```

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

### FFmpeg Roberts Operator Example

Source: https://ffmpeg.org/ffmpeg-all.html

Applies the Roberts cross operator to the input video stream. This example demonstrates setting the scale to 2 and delta to 10.

```bash
-i INPUT -vf "hwupload, roberts_opencl=scale=2:delta=10, hwdownload" OUTPUT

```

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

### Display Video Input with FFmpeg

Source: https://ffmpeg.org/ffmpeg-all.html

This example decodes, displays, and encodes video input simultaneously using the xv output device. The output is directed to a display named 'display'.

```bash
ffmpeg -i INPUT OUTPUT -f xv display
```

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

### FFmpeg paletteuse Example

Source: https://ffmpeg.org/ffmpeg-all.html

Use a palette to downsample an input video stream. The palette must be a 256-pixel image. This example shows how to use a pre-generated palette with ffmpeg.

```bash
ffmpeg -i input.mkv -i palette.png -lavfi paletteuse output.gif
```

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

### Setup TLS/SSL Server with FFmpeg

Source: https://ffmpeg.org/ffmpeg-all.html

Creates a TLS/SSL server using FFmpeg to securely serve an input stream. Requires specifying certificate and key files for the handshake.

```ffmpeg
ffmpeg -i input -f format tls://hostname:port?listen&cert=server.crt&key=server.key
```

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

### Show Available FFmpeg Sample Formats

Source: https://ffmpeg.org/ffmpeg-all.html

Lists all supported sample formats for audio data.

```bash
ffmpeg -sample_fmts
```

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

### Initialize CUDA Hardware Device (First Device with Primary Context)

Source: https://ffmpeg.org/ffmpeg-all.html

Initializes a CUDA hardware device, selecting the first device (index 0) and utilizing its primary device context.

```ffmpeg
-init_hw_device cuda:0,primary_ctx=1
```

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

### FFmpeg drawtext filter parameter example

Source: https://ffmpeg.org/ffmpeg-all.html

Example of setting drawtext filter parameters, including fontsize, fontcolor, and text. Note the escaping required for colons and spaces within the text.

```ffmpeg
fontsize=56:fontcolor=green:text='Hello World'
```

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

### FFmpeg blackdetect filter example

Source: https://ffmpeg.org/ffmpeg-all.html

Use the blackdetect filter to find black segments in a video. This example sets the minimum black duration to 2 seconds and the pixel black threshold to 0.00.

```bash
blackdetect=d=2:pix_th=0.00
```

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

### FFmpeg volumedetect Filter Output Example

Source: https://ffmpeg.org/ffmpeg-all.html

This snippet shows an example of the output generated by the volumedetect filter. It includes statistics like mean volume, maximum volume, and a histogram of volume values in decibels.

```text
[Parsed_volumedetect_0  0xa23120] mean_volume: -27 dB
[Parsed_volumedetect_0  0xa23120] max_volume: -4 dB
[Parsed_volumedetect_0  0xa23120] histogram_4db: 6
[Parsed_volumedetect_0  0xa23120] histogram_5db: 62
[Parsed_volumedetect_0  0xa23120] histogram_6db: 286
[Parsed_volumedetect_0  0xa23120] histogram_7db: 1042
[Parsed_volumedetect_0  0xa23120] histogram_8db: 2551
[Parsed_volumedetect_0  0xa23120] histogram_9db: 4609
[Parsed_volumedetect_0  0xa23120] histogram_10db: 8409

```

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

### FFplay Filtergraph with ZMQ

Source: https://ffmpeg.org/ffmpeg-all.html

This example demonstrates a filtergraph generated by ffplay that includes the zmq filter. It shows how to name specific filter instances for targeted command control.

```bash
ffplay -dumpgraph 1 -f lavfi "
color=s=100x100:c=red  [l];
color=s=100x100:c=blue [r];
nullsrc=s=200x100, zmq [bg];
[bg][l]   overlay     [bg+l];
[bg+l][r] overlay@my=x=100 "

```

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

### Connect to ZMQ Stream with FFplay

Source: https://ffmpeg.org/ffmpeg-all.html

Demonstrates how multiple clients can connect to an existing ZeroMQ stream using FFplay.

```shell
ffplay zmq:tcp://127.0.0.1:5555

```

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

### FFmpeg silenceremove: Trim silence with start and stop silence retention

Source: https://ffmpeg.org/ffmpeg-all.html

Combines trimming every second silence period with retaining up to 0.5 seconds of silence from trimmed periods and up to 1.5 seconds from the start of the audio.

```bash
silenceremove=stop_periods=-2:stop_duration=1:stop_threshold=-90dB:stop_silence=0.5:start_periods=1:start_duration=1:start_silence=1.5:stop_threshold=-90dB
```

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

### Initialize D3D11VA Hardware Device (Vendor ID)

Source: https://ffmpeg.org/ffmpeg-all.html

Initializes a D3D11VA hardware device, selecting the first adapter whose hardware VendorId matches the specified value.

```ffmpeg
-init_hw_device d3d11va:,vendor_id=0x8086
```

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

### Analyze Harmonics with Spectrum Visualization (showcqt)

Source: https://ffmpeg.org/ffmpeg-all.html

Generate audio with specific harmonics and visualize its spectrum. The 'timeclamp' option can be used for increased frequency domain accuracy.

```bash
ffplay -f lavfi 'aevalsrc=0.1*sin(2*PI*55*t)+0.1*sin(4*PI*55*t)+0.1*sin(6*PI*55*t)+0.1*sin(8*PI*55*t),
asplit[a][out1]; [a] showcqt [out0]'
```

```bash
ffplay -f lavfi 'aevalsrc=0.1*sin(2*PI*55*t)+0.1*sin(4*PI*55*t)+0.1*sin(6*PI*55*t)+0.1*sin(8*PI*55*t),
asplit[a][out1]; [a] showcqt=timeclamp=0.5 [out0]'
```

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

### FFmpeg HLS Single File Example

Source: https://ffmpeg.org/ffmpeg-all.html

This example demonstrates how to use the 'single_file' HLS flag to store all segments in a single MPEG-TS file and use byte ranges in the playlist. This results in HLS playlists with version 4.

```bash
ffmpeg -i in.nut -hls_flags single_file out.m3u8
```

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

### Initialize Vulkan Hardware Device and Use Filter

Source: https://ffmpeg.org/ffmpeg-all.html

Initializes a Vulkan hardware device and applies the nlmeans_vulkan filter. Remember to upload frames to hardware surfaces before use and download them back to normal memory afterwards, potentially using format filters.

```bash
-init_hw_device vulkan=vk:0 -filter_hw_device vk -i INPUT -vf "hwupload,nlmeans_vulkan,hwdownload" OUTPUT
```

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

### FFmpeg Sidechain Compression Example

Source: https://ffmpeg.org/ffmpeg-all.html

This example demonstrates using the sidechaincompress filter to compress the first audio input based on the signal from the second audio input, and then merging the compressed signal with the second input. Ensure both input files (main.flac and sidechain.flac) exist.

```bash
ffmpeg -i main.flac -i sidechain.flac -filter_complex "[1:a]asplit=2[sc][mix];[0:a][sc]sidechaincompress[compr];[compr][mix]amerge"
```

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

### Play Audio with Spectrum Visualization (showcqt)

Source: https://ffmpeg.org/ffmpeg-all.html

Use this command to play an audio file while simultaneously displaying its frequency spectrum. Adjust parameters like fps and s for desired output.

```bash
ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt [out0]'
```

```bash
ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt=fps=30:count=5 [out0]'
```

```bash
ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt=s=1280x720:count=4 [out0]'
```

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

### List OpenAL Supported Devices

Source: https://ffmpeg.org/ffmpeg-all.html

Use this command to print a list of all supported audio capture devices available through OpenAL. The 'dummy' input is used as a placeholder.

```bash
$ ffmpeg -list_devices true -f openal -i dummy out.ogg

```

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

### Play RTMP Stream with ffplay

Source: https://ffmpeg.org/ffmpeg-all.html

Example command to play an RTMP stream from a server using ffplay.

```bash
ffplay "rtmp://myserver/live/mystream live=1"
```

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

### HTTP Protocol Options

Source: https://ffmpeg.org/ffmpeg-all.html

Demonstrates setting various options for the HTTP protocol, such as proxy, headers, user agent, and referer. These options allow for customization of HTTP requests.

```bash
http_proxy=http://example.com:1234
```

```bash
headers="Content-Type: application/json\r\nAuthorization: Bearer token"
```

```bash
user_agent="MyCustomAgent/1.0"
```

```bash
referer="http://example.com/previous_page"
```

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

### Play RTMP Stream with ffplay

Source: https://ffmpeg.org/ffmpeg-all.html

Example of how to play a multimedia resource from an RTMP server using ffplay.

```bash
ffplay rtmp://myserver/vod/sample
```

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

### Compressor/Gate configuration

Source: https://ffmpeg.org/ffmpeg-all.html

A configuration for a combined compressor and gate effect. This example uses specific transfer function points.

```ffmpeg
compand=points=-80/-105|-62/-80|-15.4/-15.4|0/-12|20/-7.6
```

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

### Configure tile filter with mixed options

Source: https://ffmpeg.org/ffmpeg-all.html

This example shows how to configure the 'tile' filter using a mix of positional and named options for layout, frame count, padding, and margin.

```ffmpeg
tile=3x2:nb_frames=5:padding=7:margin=2

```

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

### Filter Option Escaping Example

Source: https://ffmpeg.org/ffmpeg-all.html

Demonstrates escaping special characters like ' and : within a filter option value.

```text
this is a 'string': may contain one, or more, special characters

```

```text
text=this is a \'string\': may contain one, or more, special characters

```

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

### Record Audio and Video with AVFoundation

Source: https://ffmpeg.org/ffmpeg-all.html

Record video from device 0 and audio from device 0 into an AVI file. Ensure the correct device indices are used.

```bash
$ ffmpeg -f avfoundation -i "0:0" out.avi
```

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

### Initialize D3D11VA Hardware Device (Default)

Source: https://ffmpeg.org/ffmpeg-all.html

Initializes a D3D11VA hardware device using the default Direct3D 11 display adapter.

```ffmpeg
-init_hw_device d3d11va:
```

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

### Benchmark Selective Color Filter

Source: https://ffmpeg.org/ffmpeg-all.html

This snippet demonstrates how to benchmark the 'selectivecolor' filter by starting and stopping a timer around its application.

```ffmpeg
bench=start,selectivecolor=reds=-.2 .12 -.49,bench=stop
```

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

### Create Localhost ZMQ Stream with FFmpeg

Source: https://ffmpeg.org/ffmpeg-all.html

Example of creating a ZeroMQ stream on localhost port 5555 using FFmpeg. Ensure FFmpeg is compiled with --enable-libzmq.

```shell
ffmpeg -re -i input -f mpegts zmq:tcp://127.0.0.1:5555

```

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

### Read Specific Playlist and Chapter from BluRay

Source: https://ffmpeg.org/ffmpeg-all.html

Specify a particular playlist, angle, and starting chapter to read from a Blu-ray disc.

```bash
-playlist 4 -angle 2 -chapter 2 bluray:/mnt/bluray
```