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• FFMPEG : How to get video encoded with transparency ? [duplicate]

  23 juin 2022, par mnse_so

  I've an issue on ffmpeg usage. Guess it's my fault, but I don't understand why. I tried to study the documentation and the mass of google stuff regarding ffmpeg, but I did not find any hints for it which would help.

  


  The issue is following.

  


  I'm using ffmpeg with a pipe input as rawvideo (ARGB 8x8x8x8 pixel data). In general, it works and produces a correct video like a charm.
  
But now I'm stuck to get video with transparency, so I've changed to webm which supports transparency.

  


  As I can see on the log it uses rawvideo ARGB input as expected and do the export as vp9/yuva420p which should provide alpha support also as expected.

  


  ffmpeg.exe -y -use_wallclock_as_timestamps 1 -f rawvideo -pix_fmt argb -r 60.0 -s 600x600 -i - -q:v 0 video.webm

ffmpeg version 5.0.1-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
...
Input #0, rawvideo, from 'pipe:':
  Duration: N/A, start: 1655899073.916667, bitrate: 691200 kb/s
  Stream #0:0: Video: rawvideo (ARGB / 0x42475241), argb, 600x600, 691200 kb/s, 60 tbr, 60 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> vp9 (libvpx-vp9))
[libvpx-vp9 @ 0000027775a49f80] v1.11.0-133-ga3afed22a
[libvpx-vp9 @ 0000027775a49f80] Neither bitrate nor constrained quality specified, using default CRF of 32
Output #0, webm, to 'video.webm':
  Metadata:
    encoder         : Lavf59.16.100
  Stream #0:0: Video: vp9, yuva420p(tv, progressive), 600x600, q=2-31, 60 fps, 1k tbn
    Metadata:
      encoder         : Lavc59.18.100 libvpx-vp9
...
frame= ...


  


  But if I view the video it has no alpha.

  


  So, then I checked the video with ffprobe and to my surprise it now tells me that the stream is encoded by yuv420p which not providing alpha support !

  


  ffprobe.exe -i video.webm
ffprobe version 5.0.1-full_build-www.gyan.dev Copyright (c) 2007-2022 the FFmpeg developers
...
Input #0, matroska,webm, from 'video.webm':
  Metadata:
    ENCODER         : Lavf59.16.100
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: vp9 (Profile 0), yuv420p(tv, progressive), 600x600, SAR 1:1 DAR 1:1, 60 fps, 60 tbr, 1k tbn
    Metadata:
      alpha_mode      : 1
      ENCODER         : Lavc59.18.100 libvpx-vp9
  


  


  I've also tried many this and that options from several google research but non of them leads to the goal.

  


  Any hints are welcome to get the video encoded with transparency.

  


  PS : I also checked that the input pixels used for pipe input are containing correct alpha information.

  


• Process in c# freezes up

  12 juillet 2022, par Quicksoapy

  environment : Rider 2022.1.2, .NET 6.0, Windows 10

  


  The following piece of code should copy the musicFile that is given and add a cover to the copy, then place it as name : title - artist.extension in the same directory, for example never gonna give you up - rick astley.mp3

  


  When debugging, if i copy-paste what is saved in the variable p.StartInfo.Argumentsin a CMD terminal, it works perfectly, but in my c# code the program freezes up at p.WaitForExit();.

  


  What could i be doing wrong ?

  


   using (Process p = new Process())
    {
        p.StartInfo.UseShellExecute = false;
        p.StartInfo.CreateNoWindow = true;
        p.StartInfo.RedirectStandardOutput = true;
        p.StartInfo.FileName = "CMD.exe";
        p.StartInfo.Arguments = "ffmpeg -i \""+ musicFile +"\" -i  \""+  albumInfo.Image.Uri.ToString() +"\" -map 0:a -map 1 -codec copy -metadata:s:v title=\"Album cover\" -metadata:s:v comment=\"Cover (front)\" -disposition:v attached_pic \"" + directoryFile + "\\" + title + " - " + artist + "." + formatName + "\"";
        p.Start();
        p.WaitForExit();
    }


  


• ffmpeg how mkv to mp4 with attachment in subtitle [closed]

  17 juillet 2022, par SoonHiru

  i have trouble,,
how re-encode MKV to MP4 with attachment font in substitles, before im muxing font using mkvmerge

  


  
Stream #0:0 : Video : h264 (High), yuv420p(tv, bt709, progressive), 848x480 [SAR 160:159 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn (default)
    Metadata :
      ENCODER : Lavc58.134.100 libx264
      BPS : 266289
      DURATION : 00:23:40.044000000
      NUMBER_OF_FRAMES : 34047
      NUMBER_OF_BYTES : 47267933
      _STATISTICS_WRITING_APP : mkvmerge v68.0.0 ('The Curtain') 64-bit
      _STATISTICS_WRITING_DATE_UTC : 2022-07-15 20:06:26
      _STATISTICS_TAGS : BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1(jpn) : Audio : aac (LC), 44100 Hz, stereo, fltp (default)
    Metadata :
      BPS : 128000
      DURATION : 00:23:40.108000000
      NUMBER_OF_FRAMES : 61159
      NUMBER_OF_BYTES : 22721748
      _STATISTICS_WRITING_APP : mkvmerge v68.0.0 ('The Curtain') 64-bit
      _STATISTICS_WRITING_DATE_UTC : 2022-07-15 20:06:26
      _STATISTICS_TAGS : BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:2(ind) : Subtitle : ass (default) (forced)
    Metadata :
      BPS : 1126
      DURATION : 00:23:30.250000000
      NUMBER_OF_FRAMES : 1596
      NUMBER_OF_BYTES : 198591
      _STATISTICS_WRITING_APP : mkvmerge v68.0.0 ('The Curtain') 64-bit
      _STATISTICS_WRITING_DATE_UTC : 2022-07-15 20:06:26
      _STATISTICS_TAGS : BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:3 : Attachment : none
    Metadata :
      filename : ABELBECKER-LIGHT_0.TTF
      mimetype : font/ttf
      title : Imported font from sha202.ass
  Stream #0:4 : Attachment : none
    Metadata :
      filename : Leander_0.ttf
      mimetype : font/ttf
      title : Imported font from sha202.ass
  Stream #0:5 : Attachment : none
    Metadata :
      filename : OvertheRainbowFlipped_0.ttf
      mimetype : font/ttf
      title : Imported font from sha202.ass
  Stream #0:6 : Attachment : none
    Metadata :
      filename : QlassikBold_TB - Copy_0_0.ttf
      mimetype : font/otf
      title : Imported font from sha202.ass
Unsupported codec with id 0 for input stream 3
Unsupported codec with id 0 for input stream 4
Unsupported codec with id 0 for input stream 5
Unsupported codec with id 0 for input stream 6


  


  I try using script

  


  ffmpeg -i input.mkv -vf subtitles=input.mkv output.mp4


  


  when finished, only the subtitles, not with attachments fonts