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• ffmpeg concat multiple files into pipe

  1er août 2023, par Jacob Lambert

  I'm trying to get ffmpeg to concat 2 files and output the result to a pipe but the command never completes. If I output directly to a .mp4 file, the command does complete. The command I am using is :

  


  ffmpeg -f concat -safe 0 -protocol_whitelist file,https,tls,tcp -i /tmp/parts.txt -c copy -video_track_timescale 600 -map 0 -movflags frag_keyframe+empty_moov -f mp4 pipe:1 -y


  


  The sources in /tmp/parts.txt are presigned AWS S3 urls. As this does work when outputting directly to a .mp4, I do not believe the part files to be the issue.

  


  I think the issue may arise from needing to specify -f twice. Once for the concat and again to indicate what format to output on pipe:1.

  


  What could be the issue for this command just hanging ?

  


  Edit :

  


  Adding verbose gives a lot of logs with :

  


  [mp4 @ 0x11ae0a260] pts has no value


  


• Golang : ffmpeg Pipe Input Error when Processing MOV Files

  18 septembre 2023, par BJKang

  I'm working on a project in Golang where I'm trying to process video files using ffmpeg through pipes. However, I'm encountering issues when I try to use a pipe for the input stream.

  


  Here's a snippet of the code :

  


  func main() {
    inputPath := "video.MOV"
    fileOutput := "output.mp4"

    fileBytes, err := os.Open(inputPath)
    if err != nil {
        fmt.Println(err)
        return
    }

    outFile, err := os.Create(fileOutput)
    if err != nil {
        fmt.Println(err)
        return
    }
    defer outFile.Close()

    cmd := exec.Command(
        "ffmpeg",
        "-y",
        "-i", "pipe:0", // It is not works.
        "-vf", fmt.Sprintf("scale=-1:%s", "480"),
        "-c:v", "libx264",
        "-crf", "23", // You can adjust this value for desired quality
        "-c:a", "aac", // Assumes the audio codec to be aac, change as needed
        "-strict", "experimental",
        "-f", "mp4",
        "-movflags", "empty_moov",
        "pipe:1",
    )
    cmd.Stderr = os.Stderr
    cmd.Stdin = fileBytes
    stdout, err := cmd.StdoutPipe()
    if err != nil {
        fmt.Println(err)
        return
    }

    if err := cmd.Start(); err != nil {
        fmt.Println(err)
    }

    if _, err := io.Copy(outFile, stdout); err != nil {
        fmt.Println(err)
        return
    }

    if err := cmd.Wait(); err != nil {
        fmt.Println(err)
    }
}



  


  When running the above code, I get the following error :

  


  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0000025c65c5eb00] stream 1, offset 0x24 : partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025c65c5eb00] Could not find codec parameters for stream 0 (Video : h264 (avc1 / 0x31637661), none(smpte170m/smpte432/bt709), 1920x1440, 19882 kb/s) : unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Guessed Channel Layout for Input Stream #0.1 : mono

  


  ...
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025c65c5eb00] stream 1, offset 0x24 : partial file
Error demuxing input file 0 : Invalid data found when processing input
pipe:0 : Invalid data found when processing input
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished

  


  


  Interestingly, this error only occurs when I use the input pipe. When using a direct file path (-i inputPath), everything works fine.

  


  Has anyone encountered similar issues when piping inputs to ffmpeg in Golang ? Any insights or solutions would be greatly appreciated.

  


  Thank you !

  


• Pipe Input Error when Processing MOV Files

  18 septembre 2023, par BJKang

  I'm working on a project in Go where I'm trying to process video files using ffmpeg through pipes. However, I'm encountering issues when I try to use a pipe for the input stream.

  


  Here's a snippet of the code :

  


  func main() {
    inputPath := "video.MOV"
    fileOutput := "output.mp4"

    fileBytes, err := os.Open(inputPath)
    if err != nil {
        fmt.Println(err)
        return
    }

    outFile, err := os.Create(fileOutput)
    if err != nil {
        fmt.Println(err)
        return
    }
    defer outFile.Close()

    cmd := exec.Command(
        "ffmpeg",
        "-y",
        "-i", "pipe:0", // It is not works.
        "-vf", fmt.Sprintf("scale=-1:%s", "480"),
        "-c:v", "libx264",
        "-crf", "23", // You can adjust this value for desired quality
        "-c:a", "aac", // Assumes the audio codec to be aac, change as needed
        "-strict", "experimental",
        "-f", "mp4",
        "-movflags", "empty_moov",
        "pipe:1",
    )
    cmd.Stderr = os.Stderr
    cmd.Stdin = fileBytes
    stdout, err := cmd.StdoutPipe()
    if err != nil {
        fmt.Println(err)
        return
    }

    if err := cmd.Start(); err != nil {
        fmt.Println(err)
    }

    if _, err := io.Copy(outFile, stdout); err != nil {
        fmt.Println(err)
        return
    }

    if err := cmd.Wait(); err != nil {
        fmt.Println(err)
    }
}



  


  When running the above code, I get the following error :

  


  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0000025c65c5eb00] stream 1, offset 0x24 : partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025c65c5eb00] Could not find codec parameters for stream 0 (Video : h264 (avc1 / 0x31637661), none(smpte170m/smpte432/bt709), 1920x1440, 19882 kb/s) : unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Guessed Channel Layout for Input Stream #0.1 : mono

  


  ...
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025c65c5eb00] stream 1, offset 0x24 : partial file
Error demuxing input file 0 : Invalid data found when processing input
pipe:0 : Invalid data found when processing input
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished

  


  


  Interestingly, this error only occurs when I use the input pipe. When using a direct file path (-i inputPath), everything works fine.

  


  Has anyone encountered similar issues when piping inputs to ffmpeg in Go ?