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• ffmpeg - stream_loop mp3 + looping video (per track)

  5 mars 2023, par cYberSport91

  I'm using ffmpeg to create a livestream video playlist of a folder of mp3s and a folder of videos.

  



  I'd like everytime a new song comes on a new video loops until the next song.

  



  Initially I was using live-stream-radio which is perfect except how it's handled is after every track a new ffmpeg stream loop is initialized. And in a lot of clients this issues a stop command, and there's "dead space" between.

  



  My attempt was when creating the gif playlist text file (they were gifs but I converted to mp4), I set the duration for the duration of the corresponding track. The problem is the video plays once, and then freezes on the final frame until the next track.

  



  rm music.txt
rm gifs.txt
printf "ffconcat version 1.0\n" >> gifs.txt
printf "ffconcat version 1.0\n" >> music.txt
for i in {1..9}; do
  printf "file 'mp3/00%s.mp3'\n" $i >> music.txt
done

for i in {1..9}; do
  DURATION=$(ffmpeg -i mp3/00$i.mp3 2>&1 | awk '/Duration/ { print substr($2,0,length($2)-1) }')
  printf "file 'gif/00%s.mp4'\nduration %s\n" $i $DURATION >> gifs.txt
done

ffmpeg \
    -stream_loop -1 \
    -i gifs.txt \
    -i music.txt \
    -vcodec libx264 \
    -f flv "$URL"


  



  Any ideas here would be great.

  


• avformat/matroskaenc : Ignore AttachedFiles for track limit

  27 novembre 2019, par Andreas Rheinhardt

  avformat/matroskaenc : Ignore AttachedFiles for track limit
  Attachments are streams in FFmpeg, but they are not tracks in Matroska.
  
  Yet they were counted when checking a limit for the number of tracks that
  
  the Matroska muxer imposes. This is unnecessary and has been changed.
  Also use unsigned variables for the variables denoting TrackNumbers as
  
  negative TrackNumbers are impossible.
  (The Matroska file format actually has practically no limit on the
  
  number of tracks and this is purely what our muxer supports. But even if
  
  this limit were removed/relaxed in the future, it still makes sense to
  
  use small TrackNumbers as this patch does, because greater numbers need
  
  more bytes to encode.)
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskaenc.c

• FFmpeg : How can I loop a single frame of video to cover the length of audio track

  6 avril 2020, par John Bergqvist

  I have a VOB file holding an MPEG-2 video track with an AC-3 audio track. The video track of that VOB file consists of a single frame, which when played in a DVD player, holds that still frame until the audio track has finished.

  



  How can I (with FFMPEG ideally), loop that frame to make a "normal" video track that lasts for the length of the audio track, rather than just a single frame ?

  



  ffmpeg version N-91999-g148a21611d Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 8.2.1 (GCC) 20180813
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --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
  libavutil      56. 19.101 / 56. 19.101
  libavcodec     58. 30.100 / 58. 30.100
  libavformat    58. 18.102 / 58. 18.102
  libavdevice    58.  4.103 / 58.  4.103
  libavfilter     7. 32.100 /  7. 32.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
Input #0, mpeg, from '.\SINGLEFRAME.VOB':
  Duration: 00:00:47.94, start: 0.336711, bitrate: 439 kb/s
    Stream #0:0: Data: dvd_nav_packet
    Stream #0:1: Video: mpeg2video (Main), yuv420p(tv), 720x576 [SAR 16:15 DAR 4:3], 8000 kb/s, 25 tbr, 90k tbn, 50 tbc
    Stream #0:2: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s