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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...

  


• How to repackage mov/mp4 file into HLS playlist with multiple audio streams

  9 septembre 2022, par Martyna

  I'm trying to convert some videos (in the different formats, e.g., mp4, mov) which contain one video stream and multiple audio streams into one HLS playlist with multiple audio streams (treated as languages) and only one video stream.

  


  I already browsed a lot of stack threads and tried many different approaches, but I was only able to find answers for creating different HLS playlists with different audios.

  


  Sample scenario which I have to handle :

  


  

  1. I have one mov file, containing one video stream and 2 audio streams.

  


  2. I need to create an HLS playlist from this mov file, which will use this one video stream, but would encode these 2 audio streams as language tracks (so let's say it's ENG and FRA)

  


  3. Such prepared HLS can be later streamed in the player, and the end user would have a possibility to switch between audio tracks while watching the clip.

  


  


  What I was able to achieve is to create multiple hls playlists each with different audio track.

  


  ffmpeg -i "file_name.mp4" \
-map 0:v -map 0:a -c:v copy -c:a copy -start_number 0 \
-f hls \
-hls_time 10 \
-hls_playlist_type vod \
-hls_list_size 0 \
-master_pl_name master_playlist_name.m3u8 \
-var_stream_map "v:0,agroup:groupname a:0,agroup:groupname,language:ENG a:1,agroup:groupname" file_name_%v_.m3u8


  


  My biggest issue is that I'm having hard time understanding how -map and -var_stream_map options should be used in my case, or if they even should be used in this scenario.

  


  An example of the result of ffmpeg -i command on the original mov file which should be converted into HLS.

  


    Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 8786 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
    Metadata:
      handler_name    : Apple Video Media Handler
      vendor_id       : [0][0][0][0]
      timecode        : 00:00:56:05
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]


  


  I also checked this blogpost and I would like to achieve this exact effect, but with video, not with audio.

  


  


  For example, -var_stream_map "v:0,a:0 v:1,a:0 v:2,a:0" implies that
the audio stream denoted by a:0 is used in all three video renditions.

  


  


• Using ffmpeg to check if playlist file is empty or not

  14 septembre 2022, par qwertynik

  Before using an m3u8 file to create a mp4 video, is there any FFmpeg command using which it can be checked if the playlist is empty or not ?

  


  Command used to create a video using a playlist file without any segments (.ts files)

  


  ffmpeg -i 57cfa531e34771a4e945c6926c108428_1ed332b9-c0e7-6146-a164-064ee1bc8164.m3u8 -vcodec copy -acodec copy -absf aac_adtstoasc recording.mp4


  


  Output :

  


  ffmpeg version 3.4.8 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-39)
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-indev=jack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --disable-encoder=libopus --enable-libpulse --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzvbi --enable-avfilter --enable-avresample --enable-libmodplug --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Empty playlist
57cfa531e34771a4e945c6926c108428_1ed332b9-c0e7-6146-a164-064ee1bc8164.m3u8: End of file


  


  The above command prints the fact that the playlist is empty. Can this information alone be retrieved from FFmped without attempting to create a video ?

  


  m3u8 files for experimentation :

  


  


  • Empty playlist

    


  


  • Non-empty playlist