### Installing ffmpeg-go Package

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This command uses `go get` to download and install the `ffmpeg-go` Go package from its GitHub repository. It's the first step to integrate `ffmpeg-go` into a Go project.

```Bash
go get -u github.com/u2takey/ffmpeg-go
```

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

### Verifying FFmpeg Installation

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This command is used to verify that FFmpeg is correctly installed and accessible via the system's `$PATH` environment variable. A successful execution displays FFmpeg version information.

```Bash
ffmpeg
```

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

### Transcoding Video Codec with ffmpeg-go

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This Go example shows how to transcode a video file from its original codec to H.265 (`libx265`) using `ffmpeg-go`. It specifies the input, output, and the target video codec.

```Go
err := ffmpeg.Input("./sample_data/in1.mp4").
		Output("./sample_data/out1.mp4", ffmpeg.KwArgs{"c:v": "libx265"}).
		OverWriteOutput().ErrorToStdOut().Run()
```

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

### Example FFmpeg Progress Output (Bash)

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This snippet shows the typical output format of FFmpeg progress updates when monitored via a Unix socket, indicating the completion percentage of the encoding task.

```Bash
progress:  .0
progress:  0.72
progress:  1.00
progress:  done
```

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

### Adding Watermark to Video with ffmpeg-go

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This Go example illustrates how to overlay an image as a watermark onto a video using `ffmpeg-go`. It scales the watermark and applies it at a specific position and enables it after a certain time offset.

```Go
// show watermark with size 64:-1 in the top left corner after seconds 1
overlay := ffmpeg.Input("./sample_data/overlay.png").Filter("scale", ffmpeg.Args{"64:-1"})
err := ffmpeg.Filter(
    []*ffmpeg.Stream{
        ffmpeg.Input("./sample_data/in1.mp4"),
        overlay,
    }, "overlay", ffmpeg.Args{"10:10"}, ffmpeg.KwArgs{"enable": "gte(t,1)"}).
    Output("./sample_data/out1.mp4").OverWriteOutput().ErrorToStdOut().Run()
```

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

### Showing FFmpeg Progress with ffmpeg-go (Go)

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This Go function demonstrates how to display FFmpeg encoding progress. It probes the input file to get its total duration, then uses `GlobalArgs` to specify a Unix socket for progress updates, allowing real-time monitoring of the encoding process.

```Go
func ExampleShowProgress(inFileName, outFileName string) {
	a, err := ffmpeg.Probe(inFileName)
	if err != nil {
		panic(err)
	}
	totalDuration := gjson.Get(a, "format.duration").Float()

	err = ffmpeg.Input(inFileName).
		Output(outFileName, ffmpeg.KwArgs{"c:v": "libx264", "preset": "veryslow"}).
		GlobalArgs("-progress", "unix://"+TempSock(totalDuration)).
		OverWriteOutput().
		Run()
	if err != nil {
		panic(err)
	}
}
ExampleShowProgress("./sample_data/in1.mp4", "./sample_data/out2.mp4")
```

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

### Extracting Single Frame as JPEG with ffmpeg-go

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This Go example defines a function `ExampleReadFrameAsJpeg` that extracts a specific frame from a video file and returns it as a JPEG image in an `io.Reader`. It then demonstrates decoding and saving this frame using the `imaging` library.

```Go
func ExampleReadFrameAsJpeg(inFileName string, frameNum int) io.Reader {
	buf := bytes.NewBuffer(nil)
	err := ffmpeg.Input(inFileName).
		Filter("select", ffmpeg.Args{fmt.Sprintf("gte(n,%d)", frameNum)}).
		Output("pipe:", ffmpeg.KwArgs{"vframes": 1, "format": "image2", "vcodec": "mjpeg"}).
		WithOutput(buf, os.Stdout).
		Run()
	if err != nil {
		panic(err)
	}
	return buf
}

reader := ExampleReadFrameAsJpeg("./sample_data/in1.mp4", 5)
img, err := imaging.Decode(reader)
if err != nil {
    t.Fatal(err)
}
err = imaging.Save(img, "./sample_data/out1.jpeg")
if err != nil {
    t.Fatal(err)
}
```

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

### Converting Video Segment to GIF with ffmpeg-go

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This Go snippet demonstrates how to extract a short segment from a video and convert it into an animated GIF using `ffmpeg-go`. It specifies the start time, duration, resolution, pixel format, and frame rate for the output GIF.

```Go
err := ffmpeg.Input("./sample_data/in1.mp4", ffmpeg.KwArgs{"ss": "1"}).
    Output("./sample_data/out1.gif", ffmpeg.KwArgs{"s": "320x240", "pix_fmt": "rgb24", "t": "3", "r": "3"}).
    OverWriteOutput().ErrorToStdOut().Run()
```

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

### Cutting Video by Timestamp with ffmpeg-go

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This Go snippet demonstrates how to cut a specific segment from a video file using `ffmpeg-go` by specifying a start timestamp (`ss`) and a duration (`t`). It creates a new output file containing only the specified segment.

```Go
err := ffmpeg.Input("./sample_data/in1.mp4", ffmpeg.KwArgs{"ss": 1}).
    Output("./sample_data/out1.mp4", ffmpeg.KwArgs{"t": 1}).OverWriteOutput().Run()
assert.Nil(t, err)
```

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

### Generating Multiple Video Outputs with ffmpeg-go

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This Go snippet demonstrates how to generate multiple output video files from a single input, each with different resolutions and bitrates, using `ffmpeg-go`'s `Split` and `MergeOutputs` functions. It's useful for creating adaptive streaming assets.

```Go
// get multiple output with different size/bitrate
input := ffmpeg.Input("./sample_data/in1.mp4").Split()
out1 := input.Get("0").Filter("scale", ffmpeg.Args{"1920:-1"}).
Output("./sample_data/1920.mp4", ffmpeg.KwArgs{"b:v": "5000k"})
out2 := input.Get("1").Filter("scale", ffmpeg.Args{"1280:-1"}).
Output("./sample_data/1280.mp4", ffmpeg.KwArgs{"b:v": "2800k"})

err := ffmpeg.MergeOutputs(out1, out2).OverWriteOutput().ErrorToStdOut().Run()
```

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

### Setting CPU Limits for FFmpeg-go Operations (Go)

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This Go snippet demonstrates how to set CPU resource limits for an FFmpeg operation using `RunWithResource`. The parameters `0.1` and `0.5` likely represent CPU request and limit, ensuring the FFmpeg process adheres to specified resource constraints.

```Go
e := ComplexFilterExample("./sample_data/in1.mp4", "./sample_data/overlay.png", "./sample_data/out2.mp4")
err := e.RunWithResource(0.1, 0.5)
if err != nil {
    assert.Nil(t, err)
}
```

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

### Complex Video Processing with ffmpeg-go

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This Go snippet demonstrates advanced video manipulation using `ffmpeg-go`, including splitting a video, trimming segments, concatenating them, overlaying another video, and drawing a box. It showcases chaining multiple FFmpeg operations.

```Go
split := Input(TestInputFile1).VFlip().Split()
	split0, split1 := split.Get("0"), split.Get("1")
	overlayFile := Input(TestOverlayFile).Crop(10, 10, 158, 112)
err := Concat([]*Stream{
    split0.Trim(KwArgs{"start_frame": 10, "end_frame": 20}),
    split1.Trim(KwArgs{"start_frame": 30, "end_frame": 40})}).
    Overlay(overlayFile.HFlip(), "").
    DrawBox(50, 50, 120, 120, "red", 5).
    Output(TestOutputFile1).
    OverWriteOutput().
    Run()
```

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

### Verifying FFmpeg CPU Usage with `top` (Bash)

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This `top` command output snippet verifies that the FFmpeg process is adhering to the set CPU limit, showing `50.2`% CPU usage, which corresponds to the `0.5` core limit specified in the Go code.

```Bash
> top 
PID    USER       PR  NI    VIRT    RES    SHR S  %CPU   %MEM     TIME+ COMMAND
1386105 root      20   0 2114152 273780  31672 R  50.2   1.7      0:16.79 ffmpeg
```

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

### Generating FFmpeg Complex Filter Graph (Go)

Source: https://github.com/u2takey/ffmpeg-go/blob/master/README.md

This Go snippet demonstrates creating a complex FFmpeg filter graph. It involves splitting a video, trimming segments, overlaying a cropped and flipped image, drawing a box, and finally generating a Mermaid flowchart representation of the entire filter chain.

```Go
split := Input(TestInputFile1).VFlip().Split()
	split0, split1 := split.Get("0"), split.Get("1")
	overlayFile := Input(TestOverlayFile).Crop(10, 10, 158, 112)
b, err := Concat([]*Stream{
    split0.Trim(KwArgs{"start_frame": 10, "end_frame": 20}),
    split1.Trim(KwArgs{"start_frame": 30, "end_frame": 40})}).
    Overlay(overlayFile.HFlip(), "").
    DrawBox(50, 50, 120, 120, "red", 5).
    Output(TestOutputFile1).
    OverWriteOutput().View(ViewTypeFlowChart)
fmt.Println(b)
```

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