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• avcodec/mjpeg_parser : skip markers after EOI, not by size

  25 novembre 2021, par Alex Xu (Hello71)

  avcodec/mjpeg_parser : skip markers after EOI, not by size
  The check for m->size >= 0xF000 is intended to avoid skipping too much
  
  garbage data between JPEG frames in test_roman (thus missing next SOI),
  
  but it erroneously also skips valid markers between SOI and SOS. Instead
  
  of this, we should simply skip parsing markers other than SOI after EOI.
  
  That way, we will not accidentally skip over SOI due to some garbage
  
  between frames. There is still a small risk of encountering FFD8 in the
  
  garbage data, but the chance of this is fairly low.
  Fixes : https://trac.ffmpeg.org/ticket/8967
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mjpeg_parser.c

• Updating ffmpeg on Ubuntu 12.04 ; conflicts with old version from standard repository

  29 octobre 2016, par Frank van Wensveen

  I have never used ffmpeg on my Ubuntu Linux 12.04 (Precise Pangolin) box until now. Typing ’ffmpeg’ at the command prompt revealed that ffmpeg 0.8.17 (listed as ffmpeg 0.8.17-4:0.8.17-0ubuntu0.12.04.2) was installed. Seeing as I need to convert h.265 to h.264, an update was obviously required.

  Following posted instructions, I installed a ream of packages :

  $ sudo apt-get install faad libmp4v2-dev libfaac0 libfaac-dev
  
  libxvidcore4 libxvidcore4-dev liba52-0.7.4 liba52-0.7.4-dev libx264-dev
  
  libgsm-tools libogg-dev libtheora-bin libfaad-dev libvorbis-dev 
  
  libtheora-dev libdts-dev git-core yasm texi2html checkinstall

  followed by

  $ sudo apt-get purge ffmpeg

  in order to get rid of the old stuff from the original repo.

  Downloaded the latest ffmpeg, and a ."/configure ; make ; sudo make install" later, I should be in business.

  Except that typing ’ffmpeg’ at the prompt still fired up the old version. A quick look revealed that the old ffmpeg binary was still sitting in /usr/bin with the new one being installed in /usr/local/bin. But ffmpeg is no longer listed as an installed package, and sudo apt-get remove ffmpeg tells me that "Package ffmpeg is not installed, so not removed".

  Running /usr/local/bin/ffmpeg directly works, however then fails in an Unknown encoder ’libx264’ error. Which is puzzling because the package libx264-120 is installed and /usr/lib/i386-linux-gnu/libx264.so.120 (with the appropriate symlink to /usr/lib/i386-linux-gnu/libx264.so) does exist.

  Maybe I’ve been looking at this for too long, because I’m sure this is a simple issue but I just can’t see it.

  Can someone please hand me the stupid had and point out why I deserve to wear it ?

  Tnx !

• Updating ffmpeg on Ubuntu 12.04 ; conflicts with old version from standard repository

  29 octobre 2016, par Frank van Wensveen

  I have never used ffmpeg on my Ubuntu Linux 12.04 (Precise Pangolin) box until now. Typing ’ffmpeg’ at the command prompt revealed that ffmpeg 0.8.17 (listed as ffmpeg 0.8.17-4:0.8.17-0ubuntu0.12.04.2) was installed. Seeing as I need to convert h.265 to h.264, an update was obviously required.

  Following posted instructions, I installed a ream of packages :

  $ sudo apt-get install faad libmp4v2-dev libfaac0 libfaac-dev
  
  libxvidcore4 libxvidcore4-dev liba52-0.7.4 liba52-0.7.4-dev libx264-dev
  
  libgsm-tools libogg-dev libtheora-bin libfaad-dev libvorbis-dev 
  
  libtheora-dev libdts-dev git-core yasm texi2html checkinstall

  followed by

  $ sudo apt-get purge ffmpeg

  in order to get rid of the old stuff from the original repo.

  Downloaded the latest ffmpeg, and a ."/configure ; make ; sudo make install" later, I should be in business.

  Except that typing ’ffmpeg’ at the prompt still fired up the old version. A quick look revealed that the old ffmpeg binary was still sitting in /usr/bin with the new one being installed in /usr/local/bin. But ffmpeg is no longer listed as an installed package, and sudo apt-get remove ffmpeg tells me that "Package ffmpeg is not installed, so not removed".

  Running /usr/local/bin/ffmpeg directly works, however then fails in an Unknown encoder ’libx264’ error. Which is puzzling because the package libx264-120 is installed and /usr/lib/i386-linux-gnu/libx264.so.120 (with the appropriate symlink to /usr/lib/i386-linux-gnu/libx264.so) does exist.

  Maybe I’ve been looking at this for too long, because I’m sure this is a simple issue but I just can’t see it.

  Can someone please hand me the stupid had and point out why I deserve to wear it ?

  Tnx !