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• avformat/mp3dec : avoid early EOF with concatenated gapless mp3s

  21 septembre 2014, par wm4

  avformat/mp3dec : avoid early EOF with concatenated gapless mp3s
  Consider a file created with something like :
      cat file1.mp3 file2.mp3 > result.mp3
  Then if file2.mp3 has gapless information, result.mp3 would stop playing
  
  something in the middle. This happens because the gapless info directs
  
  the decoder to discard all samples after a certain position. To make
  
  matters worse, the gapless info of file2.mp3 will be used when playing
  
  the file1.mp3 part, because the gapless info is located at the end of
  
  the file.
  While handling concatenated gapless files correctly would be insane and
  
  a lot of effort (especially without scanning the whole file on opening),
  
  it’s easy to prevent at least early EOF. Playback will happen to work,
  
  even if it’s slightly broken.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/avformat.h
  • [DH] libavformat/mp3dec.c
  • [DH] libavformat/utils.c

• How to read errors when compiling from source code

  28 décembre 2022, par slyfox1186

  Goal :

  


  Compile multiple libraries from source code to ultimately install a fully compiled version of FFmpeg with desirable libraries attached.

  


  Problem :

  


  During the compilation, all libraries (seemingly) are successful until liblv2 is reached.

  


  Error output via terminal :

  


  building lv2 - version 1.18.10
=======================
Downloading https://lv2plug.in/spec/lv2-1.18.10.tar.xz as lv2-1.18.10.tar.bz2
... Done
Extracted lv2-1.18.10.tar.bz2
$ python3 ./waf configure --prefix=/home/jman/tmp/ffmpeg/ffmpeg-build/workspace --lv2-user
python3: can't open file '/home/jman/tmp/ffmpeg/ffmpeg-build/packages/lv2-1.18.10/./waf': [Errno 2] No such file or directory

Failed to Execute python3 ./waf configure --prefix=/home/jman/tmp/ffmpeg/ffmpeg-build/workspace --lv2-user


  


  Where I need guidance :

  


  python3: can't open file '/home/jman/tmp/ffmpeg/ffmpeg-build/packages/lv2-1.18.10/./waf': [Errno 2] No such file or directory


  


  My question :

  


  What does this part mean ?

  


  lv2-1.18.10/./waf'

specifically the part /./


  


  My best guess so far is it :

  


  

  1. obviously is looking for a directory it can't find (perhaps because it truly doesn't exist)

  


  2. The missing 'waf' directory should be located inside either the "${PACKAGES}" or "${WORKSPACE}" directory.

  


  


  The ${PACKAGES}" path in this script should = /home/jman/tmp/ffmpeg/ffmpeg-build/packages

  


  The ${WORKSPACE}" path in this script should = /home/jman/tmp/ffmpeg/ffmpeg-build/workspace

  


  The full build script :

  


  https://github.com/slyfox1186/ffmpeg-build-script/blob/master/scripts/build-ffmpeg

  


  I tried my best to make this worth sometimes time without giving too much info... sorry if I don't meet the expectations of this forum.

  


  Am I even close ?

  


• pthread_frame : do not run hwaccel decoding asynchronously unless it’s safe

  24 novembre 2016, par Anton Khirnov

  pthread_frame : do not run hwaccel decoding asynchronously unless it’s safe
  Certain hardware decoding APIs are not guaranteed to be thread-safe, so
  
  having the user access decoded hardware surfaces while the decoder is
  
  running in another thread can cause failures (this is mainly known to
  
  happen with DXVA2).
  For such hwaccels, only allow the decoding thread to run while the user
  
  is inside a lavc decode call (avcodec_send_packet/receive_frame).
  Merges Libav commit d4a91e65.
  Signed-off-by : wm4 <nfxjfg@googlemail.com>
  
  Tested-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/avcodec.h
  • [DH] libavcodec/hwaccel.h
  • [DH] libavcodec/pthread_frame.c
  • [DH] libavcodec/vaapi_h264.c
  • [DH] libavcodec/vaapi_mpeg2.c
  • [DH] libavcodec/vaapi_mpeg4.c
  • [DH] libavcodec/vaapi_vc1.c
  • [DH] libavcodec/vdpau_h264.c
  • [DH] libavcodec/vdpau_hevc.c
  • [DH] libavcodec/vdpau_mpeg12.c
  • [DH] libavcodec/vdpau_mpeg4.c
  • [DH] libavcodec/vdpau_vc1.c