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• FFmpeg freezes during m3u8 stream recording

  22 juin 2018, par Олег Губаль

  Our team have implemented *.m3u8 stream recording into *.mp4 file. We are using Unity with FFmpeg Bind plugin for Android. Command for recording :

  -reconnect_delay_max 4000 -i input.m3u8 -t 00:30:00 -c copy -bsf:a aac_adtstoasc -flags +global_header -y output.mp4.

  The problem is FFmpeg freeze during the recording with non-stable internet connection. Even if internet connection stabilized new data wont be load. Callbacks like finish/failure doesnt calls. Is it some command for FFmpeg to handle not stable internet connection ?

• Single Manifest file for different audio and video segments created using MP4Box (MPEG DASH)

  29 avril 2016, par user3753682

  I have three questions

  1) Does dash.js support audio and video content multiplexed in a single segment ?

  2) If not how to merge audio.mpd and video.mpd created using MP4Box into a single out.mpd, that is supported by dash.js player ?

  3) It works if AdaptationSet is copied manually from audio.mpd and placed in video.mpd and video.mpd is played using dash.js. How to automate it ?

  MP4Box -dash 4000 -frag 4000 -rap -bs-switching no -profile dashavc264:live -segment-name ./video/segment_ -out video.mpd video.mp4#video
  
  
  
  MP4Box -dash 4000 -frag 4000 -rap -bs-switching no -profile dashavc264:live -segment-name ./audio/segment_ -out audio.mpd video.mp4#audio 

• using ffmpeg to create a wavefile image from opus

  29 décembre 2015, par edwardsmarkf

  I have been trying to use ffmpeg to create a wavefile image from an opus file. so far i have found three different methods but cannot seem to determine which one is the best.

  The end result is hopefully to have a sound-wave that is only approx. 55px in height. The image will become part of a css background-image.

  Adapted from Generating a waveform using ffmpeg :

  ffmpeg -i file.opus -filter_complex
  "showwavespic,colorbalance=bs=0.5:gm=0.3:bh=-0.5,drawbox=x=(iw-w)/2:y=(ih-h)/2:w=iw:h=1:color=black@0.5"
  file.png

  which produces this image :
  

  Next, I found this one (and my favorite because of the simplicity) :

  ffmpeg -i test.opus -lavfi showwavespic=split_channels=1:s=1024x800 test.png

  And here is what that one looks like :

  

  Finally, this one from FFmpeg Wiki : Waveform, but it seems less efficient using a second utility (gnuplot) rather than just ffmpeg :

  ffmpeg -i file.opus -ac 1 -filter:a
  aresample=4000 -map 0:a -c:a pcm_s16le -f data - | \
  gnuplot -e "set
  terminal png size 525,050 ;set output
  ’file.png’ ;unset key ;unset tics ;unset border ; set
  lmargin 0 ;set rmargin 0 ;set tmargin 0 ;set bmargin 0 ; plot ’

  

  Option two is my favorite, but i dont like the margins on the top and bottom of the waveforms.

  Option three (using gnuplot) makes the best ’shaped’ image for our needs, since the initial spike in sound seems to make the rest almost too small to use (lines tend to almost disappear) when the image is sized at only 50 pixels high.

  Any suggestions how might best approach this ? I really understand very little about any of the options I see, except of course for the size. Note too i have 10’s of thousands to process, so naturally i want to make a wise choice at the very beginning.