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• Revision 07443f1589 : Refinements on modelcoef expt to reduce storage Uses more aggrerssive interpola

  20 mai 2013, par Deb Mukherjee

  Changed Paths :
   Modify /vp9/common/vp9_entropy.c

  
   Modify /vp9/common/vp9_entropy.h

  
  
  Refinements on modelcoef expt to reduce storage

  Uses more aggrerssive interpolation to reduce storage for the
  model tables by almost more than half. Only 48 lists of probs are
  stored (as opposed to 128 before), corresponding to ONE_NODE
  probabilities of :
  1,
  3, 7, 11, ..., 115, 119,
  127, 135, ..., 247, 255.

  Besides, only 1 table is used as opposed to 2 before. So the overall
  memory needed for the tables is just 48 * 8 = 384 bytes.

  The table currently used is based on a new Pareto distribution with
  heavier tail than a generalized Gaussian - which improves results on
  derf by about 0.1% over a single table Generaized Gaussian.

  Results overall on derfraw300 is -0.14%.

  Change-Id : I19bd03559cbf5894a9f8594b8023dcc3e546f6bd

• ffmpeg sometimes only creating one segment for the entire HLS playlist regardless which -hls_time i use [closed]

  10 mai 2023, par kusti420

  can someone explain why it works as it should with certain FLACs and with other ones it only creates one m4s segment and how to fix it where it would actually create one segment every 6 seconds for any flac, as it should with "-hls_time 6".

  


  ffmpeg -i .\audio4.flac -c:a flac -vf pad="width=ceil(iw/2)*2:height=ceil(ih/2)*2" -ar 96000 -f hls -hls_time 6 -hls_playlist_type vod -strict -2 -hls_segment_type fmp4 -hls_segment_filename "idk%d.m4s" playlist.m3u8

  


  when it doesnt work then logs print out like over thousand lines of :
[hls @ 0000026653933a00] Delay between the first packet and last packet in the muxing queue is 10069334 > 10000000: forcing output

  


  i tried different versions of ffmpeg, running it on different devices and on different operating systems
was obviously expecting it to work the same for all flacs, but more than half the time it just isnt working as it should

  


• Combine audio with ffmpeg breaks video

  21 décembre 2015, par Harry Walter

  I’m attempting to combine and audio file (mp3) with a video created with ffmpeg. The video is created from several smaller clips using :

  ffmpeg -y -f concat -auto_convert 1 -i videos.txt -c copy -an -sn video.mp4

  videos.txt contains a list of videos to combine. This video is created correctly and plays fine. Next I am trying to add an audio track to the video. I’ve checked and the audio file plays correctly however when I add it using the command below the mp4 produced is corrupt and no longer valid for playback :

  ffmpeg -y -i video.mp4 audio.aac final.mp4

  Any ideas, I’m new to using ffmpeg and not sure what half the output means and what is relevant but I don’t see anything that looks like errors.