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• Ffmpeg generate master playlist file in realtime

  18 août 2022, par user994461

  I have playing with ffmpeg and HLS adaptive encoding, i want to make it somehow to encode one by one resolution and make/update master playlist file in realtime..
Example, when 240p is done master playlist file will be updated and video can be played in 240p while 480p,720p and etc... is still encoding in background.

  


  I have try with this command and actualy this is working fine but not in way as i want...

  


  /home/test/ffmpeg -i 1.mp4 
-map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0
-c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -c:a aac -ar 48000
-filter:v:0 scale="trunc(oh*a/2)*2:240" -maxrate:v:0 856k -bufsize:v:0 1200k -b:a:0 96k  
-filter:v:1 scale="trunc(oh*a/2)*2:480" -maxrate:v:1 1498k -bufsize:v:1 2100k -b:a:1 128k  
-var_stream_map "v:0,a:0,name:240p v:1,a:1,name:480p" 
-hls_time 4 -hls_list_size 0 -master_pl_name master.m3u8 -hls_segment_filename %v_%03d.ts %v.m3u8


  


  This command above encoding all resolutions in same time and must finish all before i can watch it.

  


  Any solution to make ffmpeg to encode 240p -> update playlist, encode 480p -> update playlist and etc...

  


• FFMPEG reports different (wrong) video resolution compared to how it actually plays

  30 mars 2015, par Emiliano

  Quick question, i have a movie, which was cut and rendered with Sony Vegas from its original format to a .wmv file. Here comes the tricky part, movie when played, either with VLC or WMP, has a resolution of 656x480 ... BUT when i run a ffmpeg -i on it, it says it has a resolution of 600x480 ....

  I took the time of actually capturing a frame and croping it with photoshop and its 656 and not 600 like ffmpeg its reporting, why would this could be happening ? How could i fix the headers resolution ? Would that have any impact on video re-rendering ? As i said, VLC and WMP seems not to care about the incorrect headers and are playing it right, BUT, jwplayer seems to be using the header information, which i don’t blame him, its correct to do that, but why the video headers could be wrong ?

  ffmpeg -i trailer.wmv

  Input #0, asf, from ’trailer.wmv’ :
  Duration : 00:01:04.93, start : 3.000000, bitrate : 2144 kb/s
  Stream #0.0 : Audio : wmav2, 44100 Hz, mono, 32 kb/s
  Stream #0.1 : Video : wmv3, yuv420p, 600x480 [PAR 59:54 DAR 295:216], 2065 kb/
  s, 25.00 tb(r)

  And yeah, the PAR/DAR parameters are also wrong, but honestly, i don’t understand that technical shit, usually watch video and make sure it look good, any feedback would be appreciated :P

  Is there a way to change the container information with ffmpeg so applications that actually do use the container information don’t render video incorrectly ?

• >SOLVED My FFMPEG throws me unexpected errors while writing a Thumbnail to the songs

  22 février 2019, par Harmonised7

  My issue was that my songs already had a thumbnail. Solution to overwrite thumbnail below !

  I am using Node to execute my ffmpeg. I use this wrapper :

  https://www.npmjs.com/package/ffmpeg

  Everything was fine when I was using smaller versions of the thumbnails provided by Youtube, but when I attempted the HD ones, it suddenly started giving me an error. I’ve tried -pix_fmt yuv422p and Many other pixel formats, but nothing helped. Though ONE out of 100+ songs did tag successfully.

  here is my code :

  downloadTags(tags.thumbnail, `./thumbnails/${tags.title}.jpg`).then(thumbnail =>
  
                      {
  
                          video.addCommand('-i', `"${thumbnail}"`);
  
                          video.addCommand('-map', '0');
  
                          video.addCommand('-map', '1');
  
                          video.addCommand('-c', 'copy');
  
                          video.addCommand('-c:v:1', 'png');
  
                          video.addCommand('-disposition:v:0', 'attached_pic');
  
                          if(tags.title)
  
                              video.addCommand('-metadata', `title="${tags.title}"`);
  
                          if(tags.artist)
  
                              video.addCommand('-metadata', `artist="${tags.artist}"`);
  
                          if(tags.id)
  
                              video.addCommand('-metadata', `comment="https://www.youtube.com/watch?v=${tags.id}"`);
  
                          video.addCommand('-pix_fmt', `yuv422p`);
  
  
  
  
  
                          var output = 'downloaded'
  
                          if (outFolder)
  
                          {
  
                              output = outFolder;
  
                              if(!fs.existsSync(output)) fs.mkdirSync(output);
  
                          }
  
  
  
                          video.save(`"./${output}/${tags.title}.${tags.format}"`, function (error, file) 
  
                          {
  
                              if (error)
  
                              {
  
                                  resolve(error);
  
                                  return
  
                              }
  
                              try
  
                              {
  
                                  fs.unlinkSync(song);
  
                              }
  
                              catch(err)
  
                              {
  
                                  console.log(err.code);
  
                              }
  
                              resolve();
  
  
  
                          });
  
                      });
  
  
  
                  }

  and here is my error :

  E

  RROR: Error: Command failed: ffmpeg -i "songs/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a" -y  -i "./thumbnails/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].jpg" -map 0 -map 1 -c copy -c:v:1 png -disposition:v:0 attached_pic -metadata title="&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep]" -metadata artist="AReallyLongAndAwesomeNameThatIsBetterThanYoursInEveryPossibleWay" -metadata comment="https://www.youtube.com/watch?v=HprdvIIpR-I" "./written/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a"
  
  ffmpeg version N-93214-g7e4d3dbe18 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8.2.1 (GCC) 20190212
  
    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
  
    libavutil      56. 26.100 / 56. 26.100
  
    libavcodec     58. 47.102 / 58. 47.102
  
    libavformat    58. 26.101 / 58. 26.101
  
    libavdevice    58.  6.101 / 58.  6.101
  
    libavfilter     7. 48.100 /  7. 48.100
  
    libswscale      5.  4.100 /  5.  4.100
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000002213366bb00] stream 0, timescale not set
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'songs/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].m4a':
  
    Metadata:
  
      major_brand     : M4A
  
      minor_version   : 512
  
      compatible_brands: isomiso2
  
      title           : &I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep]
  
      artist          : Cider Party
  
      encoder         : Lavf58.18.104
  
      comment         : https://www.youtube.com/watch?v=HprdvIIpR-I
  
    Duration: 00:05:24.80, start: 0.000000, bitrate: 127 kb/s
  
      Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 120x90 [SAR 1:1 DAR 4:3], 90k tbr, 90k tbn, 90k tbc
  
  Input #1, image2, from './thumbnails/&I feat. Giggly Maria - Dive (Exiark's Endless Sky Remix) [Chillstep].jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 1575 kb/s
  
      Stream #1:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 480x360 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #1:0 -> #0:2 (mjpeg (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 00000221353d4fc0] deprecated pixel format used, make sure you did set range correctly
  
  [ipod @ 00000221336703c0] Could not find tag for codec png in stream #2, codec not currently supported in container
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Error initializing output stream 0:2 --
  
  Conversion failed!

  Keep in mind that All of my thumbnails retrieved are .jpg

  Any suggestions ? Getting really desperate at this point...