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    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
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    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
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    25 avril 2011, par

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Sur d’autres sites (8686)

  • Add Sega FILM muxer

    2 avril 2018, par Misty De Meo
    Add Sega FILM muxer

    Signed-off-by : Josh de Kock <josh@itanimul.li>
    • [DH] Changelog
    • [DH] doc/general.texi
    • [DH] libavformat/Makefile
    • [DH] libavformat/allformats.c
    • [DH] libavformat/segafilmenc.c
    • [DH] libavformat/version.h

  • h264 : Support multi-field closed captions by using AVBufferRef and not resetting...

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    h264 : Support multi-field closed captions by using AVBufferRef and not resetting per field

    Signed-off-by : Josh de Kock <joshdk@obe.tv>
    • [DH] libavcodec/h264_sei.c
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  • Problems piping ffmpeg to flac encoder

    19 mai 2019, par Sebastian Olsen

    I need to encode a flac file with seektables, ffmpeg’s flac encoder does not include seektables, so I need to use the flac CLI. I’m trying to make it possible to convert any arbitrary audio file to a seekable flac file by first piping it through ffmpeg, then to the flac encoder.

    export const transcodeToFlac: AudioTranscoder&lt;{}> = ({
    
  source,
    
  destination
    
}) => {
    
  return new Promise((resolve, reject) => {
    
    let totalSize = 0
    

    
    const { stdout: ffmpegOutput, stderr: ffmpegError } = spawn("ffmpeg", [
    
      "-i",
    
      source,
    
      "-f",
    
      "wav",
    
      "pipe:1"
    
    ])
    

    
    const { stdout: flacOutput, stdin: flacInput, stderr: flacError } = spawn(
    
      "flac",
    
      ["-"]
    
    )
    

    
    flacOutput.on("data", (buffer: Buffer) => {
    
      totalSize += buffer.byteLength
    
    })
    

    
    ffmpegError.on("data", error => {
    
      console.log(error.toString())
    
    })
    

    
    flacError.on("data", error => {
    
      console.log(error.toString())
    
    })
    

    
    //stream.on("error", reject)
    

    
    destination.on("finish", () => {
    
      resolve({
    
        mime: "audio/flac",
    
        size: totalSize,
    
        codec: "flac",
    
        bitdepth: 16,
    
        ext: "flac"
    
      })
    
    })
    

    
    ffmpegOutput.pipe(flacInput)
    
    flacOutput.pipe(destination)
    
  })
    
}

    While this code works, the resulting flac file is not correct. The source audio is of duration 06:14, but the flac file is of duration 06:45:47. Encoding the flac manually without piping ffmpeg to it works fine, but I cannot do that in a server environment where I need to utilize streams.

    Here’s what the flac encoder outputs when transcoding :

    flac 1.3.2
    
Copyright (C) 2000-2009  Josh Coalson, 2011-2016  Xiph.Org Foundation
    
flac comes with ABSOLUTELY NO WARRANTY.  This is free software, and you are
    
welcome to redistribute it under certain conditions.  Type `flac' for details.
    

    
-: WARNING: skipping unknown chunk 'LIST' (use --keep-foreign-metadata to keep)
    
-: WARNING, cannot write back seekpoints when encoding to stdout
    
-: 0% complete, ratio=0.357
    
0% complete, ratio=0.432
    
0% complete, ratio=0.482
    
0% complete, ratio=0.527
    
0% complete, ratio=0.541
    
1% complete, ratio=0.554
    
1% complete, ratio=0.563
    
1% complete, ratio=0.571
    
size=   36297kB time=00:03:30.70 bitrate=1411.2kbits/s speed= 421x
    
1% complete, ratio=0.572
    
1% complete, ratio=0.570
    
1% complete, ratio=0.577
    
1% complete, ratio=0.583
    
1% complete, ratio=0.584
    
1% complete, ratio=0.590
    
1% complete, ratio=0.592
    
size=   64512kB time=00:06:14.49 bitrate=1411.2kbits/s speed= 421x
    
video:0kB audio:64512kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:
    
0.000185%
    

    
-: WARNING: unexpected EOF; expected 1073741823 samples, got 16510976 samples
    
2% complete, ratio=0.579

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