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• lavc : Use hardware config information in ff_get_format()

  26 octobre 2017, par Mark Thompson

  lavc : Use hardware config information in ff_get_format()
  This removes the dependency that hardware pixel formats previously had on
  
  AVHWAccel instances, meaning only those which actually do something need
  
  exist after this patch.
  Also updates avcodec_default_get_format() to be able to choose hardware
  
  formats if either a matching device has been supplied or no additional
  
  external configuration is required, and avcodec_get_hw_frames_parameters()
  
  to use the hardware config rather than searching the old hwaccel list.
  

  • [DBH] libavcodec/decode.c
  • [DBH] libavcodec/internal.h

• doc/developer : revise mailing list section

  4 décembre 2017, par Jim DeLaHunt

  doc/developer : revise mailing list section
  The Developer Documentation had instructions to
  
  subscribe to the ffmpeg-cvslog email list. But that is
  
  no longer accurate. For the purposes in this section —
  
  review of patches, discussion of development issues —
  
  ffmpeg_devel is the appropriate email list. Some developers
  
  may want to monitor ffmpeg-cvslog, but it is not mandatory.
  This is v3 of this doc, based on discussion in thread
  
  <https://ffmpeg.org/pipermail/ffmpeg-devel/2017-November/220528.html> ;
  
  and in response to docs Maintainer comments in
  
  <https://ffmpeg.org/pipermail/ffmpeg-devel/2017-December/221596.html>.
  1. In doc/developer.texi, add a new section about
  
  ffmpeg-devel, based on existing text from ffmpeg-cvslog
  
  section regarding discussion of patches and of
  
  development issues. Reflect wording from discussion at
  
  <https://ffmpeg.org/pipermail/ffmpeg-devel/2017-November/221199.html> ;
  
  but with copy-editing to make wording more concise.
  2. In doc/developer.texi, rewrite the ffmpeg-cvslog section
  
  to match the current usage of ffmpeg-cvslog. Some
  
  developers choose to follow this list, but it is not
  
  mandatory.
  There are a lot of improvements possible to the
  
  Developer Documentation page, beyond this refactoring.
  
  However, making those improvements is a much bigger
  
  and more difficult task.  This change is "low hanging
  
  fruit".
  Signed-off-by : Jim DeLaHunt <from.ffmpeg-dev@jdlh.com>
  
  Signed-off-by : Timothy Gu <timothygu99@gmail.com>
  

  • [DH] doc/developer.texi

• Capturing stream that has multiple frames

  28 mai 2021, par cheese5505

  I'm trying to capture a stream that has multiple "frames" (not sure that's what you would call it but it has multiple 5 second streams inside of it) with FFmpeg and saving to file. When I put it into Quicktime player and play it works fine, however when I put it into FFmpeg and review the final file it seems that the audio and video are out of sync and the video frequently stops. I think this may be because it is stopping to switch to the new 5 second video but i'm not sure. This is the command I am using :

  



  ffmpeg \
    -v 9 \
    -loglevel 99 \
    -y \
    -re \
    -hwaccel auto \
    -threads 4 \
    -user-agent "Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16" \
    -i "url here" \
    -ac 2 \
    -strict -2 \
    -c:a aac \
    test.mov


  



  In the FFmpeg log this frequently happens :

  



  frame=  242 fps=102 q=29.0 size=     252kB time=00:00:06.33 bitrate= 325.9kbits/
frame=  279 fps= 96 q=29.0 size=     252kB time=00:00:07.57 bitrate= 272.8kbits/
frame=  301 fps= 87 q=29.0 size=     252kB time=00:00:08.30 bitrate= 248.7kbits/
frame=  319 fps= 79 q=29.0 size=     252kB time=00:00:08.90 bitrate= 231.9kbits/
frame=  338 fps= 74 q=29.0 size=     252kB time=00:00:09.54 bitrate= 216.5kbits/
frame=  354 fps= 70 q=29.0 size=     252kB time=00:00:10.07 bitrate= 205.0kbits/
skipping 5 segments ahead, expired from playlists
[https @ 0x7f9d81e10380] No trailing CRLF found in HTTP header.
frame=  355 fps= 51 q=29.0 size=     252kB time=00:00:10.11 bitrate= 204.3kbits/
[hls,applehttp @ 0x7f9d83001000] No longer receiving playlist 6
[hls,applehttp @ 0x7f9d83001000] No longer receiving playlist 7
[hls,applehttp @ 0x7f9d83001000] No longer receiving playlist 8
skipping 3 segments ahead, expired from playlists
[https @ 0x7f9d81f006a0] No trailing CRLF found in HTTP header.


  



  Any ideas how I could smooth out the final file would be greatly appreciated.