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• FFmpeg side by side video (widescreen) and play each video one by one

  6 mai 2020, par Knide

  new to ffmpeg, I've already did this to combine 3 or more videos that I have into 1 video :

  



  ffmpeg -i left.mp4 -i center.mp4 -i right.mp4 -filter_complex "[0:v:0][1:v:0][2:v:0]hstack=inputs=3" -c:v libx264 -tune film -crf 16 -b:a 256k output.mp4


  



  Now what I am having trouble with is the videos have different play times (in seconds) what I want to achieve is have them all side by side (working with the code above) then have left.mp4 play first (with it's own audio) once done, center.mp4 plays (has own audio), and when done too, right.mp4 plays (has own audio) as well and the video is over.

  



  Can someone enlighten me on how to achieve this ? Thank you !

  


• avcodec/av1_metadata : filter parameter sets in packet side data

  22 avril 2020, par James Almer

  avcodec/av1_metadata : filter parameter sets in packet side data
  Extradata included in packet side data is meant to replace the codec context
  
  extradata. So when muxing for example to MP4 without this change and if
  
  extradata is present in a packet side data, the result will be that the
  
  parameter sets present in keyframes will be filtered, but the parameter sets
  
  ultimately included in the av1C box will not.
  This is especially important for AV1 as both currently supported encoders don't
  
  export the Sequence Header in the codec context extradata, but as packet side
  
  data instead.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/av1_metadata_bsf.c

• Convert file from mkv to mp4 without saving it server-side using fluent-ffmpeg in nodejs

  25 avril 2020, par Scherer

  What I am trying to do is create a node application that receives a mkv file, converts it to mp4, hardburning the subtitles, and sends it back so the user can download it. In the command line this works perfectly

  



  ffmpeg -i input.mkv -threads 1 -vf subtitles=input.mkv -acodec copy output.mp4

  



  Then, I tried to translate this into a node route using fluent-ffmpeg

  



  var ffmpeg = require('fluent-ffmpeg');

routes.post('/process', (req, res) => {
    //file sent
    const file = req.files.file
    const path = __dirname + '/public/data/'

    //saves file in server
    file.mv(path + file.name, err => {
        if (err) return res.sendStatus(500).send(err)
        console.log('upload successful')
    })

    //convert the file to mp4 with the hardburned subtitle
    ffmpeg(path + file.name).toFormat('mp4')
    .addOutputOption(["-threads 1"])
    .addOutputOption(["-acodec copy"])
    .addOutputOption(['-vf subtitles=' + path + file.name])
    .on('end', () => {
        console.log('done')
        res.sendStatus(200)
    })
    .on('error', console.log)
    .saveToFile(path + 'output.mp4') //saves file in server
})


  



  This is the HTML I am testing

  



  &#xA;&#xA;&#xA;    &#xA;    &#xA;    &#xA;&#xA;&#xA;    <form method="&#x27;post&#x27;" action="/process" enctype="multipart/form-data">&#xA;        <input type="&#x27;file&#x27;" />&#xA;        <input type="&#x27;submit&#x27;" value="&#x27;send&#x27;" />&#xA;    </form>&#xA;&#xA;&#xA;

  



  Unfortunately, this didn't work and the code returned the following error message

  



  Error: ffmpeg exited with code 1: Error reinitializing filters!&#xA;Failed to inject frame into filter network: Invalid argument&#xA;Error while processing the decoded data for stream #0:0&#xA;Conversion failed!&#xA;&#xA;    at ChildProcess.<anonymous> (C:\Users\fsvic\Desktop\ffmpeg_teste_node\node_modules\fluent-ffmpeg\lib\processor.js:182:22)&#xA;    at ChildProcess.emit (events.js:182:13)&#xA;    at Process.ChildProcess._handle.onexit (internal/child_process.js:240:12) &#x27;&#x27; &#x27;ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers\n  built with gcc 9.1.1 (GCC) 20190807\n  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt\n  libavutil      56. 31.100 / 56. 31.100\n  libavcodec     58. 54.100 / 58. 54.100\n  libavformat    58. 29.100 / 58. 29.100\n  libavdevice    58.  8.100 / 58.  8.100\n  libavfilter     7. 57.100 /  7. 57.100\n  libswscale      5.  5.100 /  5.  5.100\n  libswresample   3.  5.100 /  3.  5.100\n  libpostproc    55.  5.100 / 55.  5.100\nInput #0, matroska,webm, from \&#x27;C:\\Users\\fsvic\\Desktop\\ffmpeg_teste_node/public/data/star_trails.mkv\&#x27;:\n  Metadata:\n    COMPATIBLE_BRANDS: mp42mp41\n    MAJOR_BRAND     : mp42\n    MINOR_VERSION   : 0\n    ENCODER         : Lavf57.66.105\n  Duration: 00:00:21.25, start: 0.000000, bitrate: 1893 kb/s\n    Stream #0:0(eng): Video: h264 (High), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 50 tbc (default)\n    Metadata:\n      HANDLER_NAME    : ?Mainconcept Video Media Handler\n      ENCODER         : Lavc57.83.101 libx264\n      DURATION        : 00:00:21.163000000\n    Stream #0:1(eng): Audio: vorbis, 48000 Hz, stereo, fltp (default)\n    Metadata:\n      HANDLER_NAME    : #Mainconcept MP4 Sound Media Handler\n      ENCODER         : Lavc57.83.101 libvorbis\n      DURATION        : 00:00:21.251000000\nStream mapping:\n  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))\n  Stream #0:1 -> #0:1 (copy)\nPress [q] to stop, [?] for help\n[subtitles @ 000001cc091dbb80] Unable to parse option value "UsersfsvicDesktopffmpeg_teste_node/public/data/star_trails.mkv" as image size\n    Last message repeated 1 times\n[subtitles @ 000001cc091dbb80] Error setting option original_size to value UsersfsvicDesktopffmpeg_teste_node/public/data/star_trails.mkv.\n[Parsed_subtitles_0 @ 000001cc0910a8c0] Error applying options to the filter.\n[AVFilterGraph @ 000001cc0912ba80] Error initializing filter \&#x27;subtitles\&#x27; with args \&#x27;C:UsersfsvicDesktopffmpeg_teste_node/public/data/star_trails.mkv\&#x27;\nError reinitializing filters!\nFailed to inject frame into filter network: Invalid argument\nError while processing the decoded data for stream #0:0\nConversion failed!\n&#x27;&#xA;</anonymous>

  



  Besides that, I cannot save anything in the server side due to memory limitations, so I need a way to use the FFmpeg commands without an actual file in the folder. I discovered that the pipe feature might do the job, but I have no idea on how I could implement it in the current code.