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• FFMPEG : Fixing frame rate with filter_complex movie filter

  4 mai 2018, par stevendesu

  With some help from @Gyan I came up with the following FFMPEG command which streams 4 videos simultaneously to 4 separate RTMP endpoints, looping the videos infinitely and keeping the audio and video synchronized :

  ffmpeg \
  
      -filter_complex \
  
          "movie=01.mp4:loop=0[v1];[v1]setpts=N/FRAME_RATE/TB[v1];
  
           amovie=01.mp4:loop=0[a1];[a1]asetpts=N/SR/TB[a1];
  
           movie=02.mp4:loop=0[v2];[v2]setpts=N/FRAME_RATE/TB[v2];
  
           amovie=02.mp4:loop=0[a2];[a2]asetpts=N/SR/TB[a2];
  
           movie=03.mp4:loop=0[v3];[v3]setpts=N/FRAME_RATE/TB[v3];
  
           amovie=03.mp4:loop=0[a3];[a3]asetpts=N/SR/TB[a3];
  
           movie=04.mp4:loop=0[v4];[v4]setpts=N/FRAME_RATE/TB[v4];
  
           amovie=04.mp4:loop=0[a4];[a4]asetpts=N/SR/TB[a4]" \
  
      -map "[v1]" -map "[a1]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/01 \
  
      -map "[v2]" -map "[a2]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/02 \
  
      -map "[v3]" -map "[a3]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/03 \
  
      -map "[v4]" -map "[a4]" \
  
          -c:a libfdk_aac \
  
          -c:v libx264 -preset ultrafast \
  
          -b:v 500k -b:a 32k \
  
          -f flv rtmp://output/04

  This is almost perfect, except that it’s doubling my frame rate :

  frame=20822 fps= 46 q=32.0 q=34.0 q=29.0 q=32.0 size=   57617kB time=00:14:28.39 bitrate= 543.5kbits/s speed=1.92x

  Note the speed=1.92x bit. This is causing the live stream to play at double speed, as well.

  (the original video was approximately 24 fps)

• avcodec/mediacodecdec : wait on first frame after input buffers are full

  25 avril 2018, par Aman Gupta

  avcodec/mediacodecdec : wait on first frame after input buffers are full
  The output_buffer_count==0 special case is no longer required, and
  
  can cause spurious EAGAIN to surface to the user when input buffers
  
  are filled up. Since the caller now knows if the decoder is accepting
  
  new input (via current_input_buffer>=0), let the wait parameter
  
  control whether we block or not.
  Signed-off-by : Aman Gupta <aman@tmm1.net>
  
  Signed-off-by : Matthieu Bouron <matthieu.bouron@gmail.com>
  

  • [DH] libavcodec/mediacodecdec_common.c
  • [DH] libavcodec/mediacodecdec_common.h

• Kodi : playback several video files from the internet as single movie with single timeline

  30 mai 2018, par HarryFox

  I’m writing an add-on for Kodi in Python, for a site with movie collection, which can be able to playback online video from the site. But problem is that many of them splitted apart on pieces of different length. And its not mpeg dash nor m3u playlists, its just individual pieces of single movie or an episode.

  My target is able to play those splitted videos as single movie with single timeline and playback will no require download all pieces of a movie. It’s important because many of Movies\episodes provides with subtitle file, that why single timeline is important. Also general idea for plugin which I’m writing is comfort to use, so online playback is very important too.

  I did some research but it almost no result. On official Kodi forum advise to create Input Stream add-on like Input Stream Adaptive, but it was written on c++ and it’s unattainable for me (for now at least). There is no tools for python to create such kind of add-ons.

  Another idea is to create middle server which on fly will somehow (with ffmpeg) combine those pieces, but it seems that the process will too resource-intensive especially for TV-boxes.
  In this case also raise many question about which way is better, and i have no enough experience and knowledge to solve the problems by myself even with google.

  So i need an advice how can i solve the problem, just to know right direction.
  Thank you for your time.
  Sorry for my English.