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• avcodec, avformat : deprecate anything related to side data merging

  16 mars 2017, par wm4

  avcodec, avformat : deprecate anything related to side data merging
  This patch deprecates anything that has to do with merging/splitting
  
  side data. Automatic side data merging (and splitting), as well as all
  
  API symbols involved in it, are removed completely.
  Two FF_API_ defines are dedicated to deprecating API symbols related to
  
  this : FF_API_MERGE_SD_API removes av_packet_split/merge_side_data in
  
  libavcodec, and FF_API_LAVF_KEEPSIDE_FLAG deprecates
  
  AVFMT_FLAG_KEEP_SIDE_DATA in libavformat.
  Since it was claimed that changing the default from merging side data to
  
  not doing it is an ABI change, there are two additional FF_API_ defines,
  
  which stop using the side data merging/splitting by default (and remove
  
  any code in avformat/avcodec doing this) : FF_API_MERGE_SD in libavcodec,
  
  and FF_API_LAVF_MERGE_SD in libavformat.
  It is very much intended that FF_API_MERGE_SD and FF_API_LAVF_MERGE_SD
  
  are quickly defined to 0 in the next ABI bump, while the API symbols are
  
  retained for a longer time for the sake of compatibility.
  
  AVFMT_FLAG_KEEP_SIDE_DATA will (very much intentionally) do nothing for
  
  most of the time it will still be defined. Keep in mind that no code
  
  exists that actually tries to unset this flag for any reason, nor does
  
  such code need to exist. Code setting this flag explicitly will work as
  
  before. Thus it’s ok for AVFMT_FLAG_KEEP_SIDE_DATA to do nothing once
  
  side data merging has been removed from libavformat.
  In order to avoid that anyone in the future does this incorrectly, here
  
  is a small guide how to update the internal code on bumps :
   next ABI bump (probably soon) :
  
    - define FF_API_LAVF_MERGE_SD to 0, and remove all code covered by it
  
    - define FF_API_MERGE_SD to 0, and remove all code covered by it
  
   next API bump (typically two years in the future or so) :
  
    - define FF_API_LAVF_KEEPSIDE_FLAG to 0, and remove all code covered
  
      by it
  
    - define FF_API_MERGE_SD_API to 0, and remove all code covered by it
  This forces anyone who actually wants packet side data to temporarily
  
  use deprecated API to get it all. If you ask me, this is batshit fucked
  
  up crazy, but it’s how we roll. Making AVFMT_FLAG_KEEP_SIDE_DATA to be
  
  set by default was rejected as an ABI change, so I’m going all the way
  
  to get rid of this once and for all.
  Reviewed-by : James Almer <jamrial@gmail.com>
  
  Reviewed-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] doc/APIchanges
  • [DH] libavcodec/avcodec.h
  • [DH] libavcodec/avpacket.c
  • [DH] libavcodec/utils.c
  • [DH] libavcodec/version.h
  • [DH] libavformat/avformat.h
  • [DH] libavformat/mux.c
  • [DH] libavformat/options_table.h
  • [DH] libavformat/utils.c
  • [DH] libavformat/version.h

• avfilter/vf_overlay : remove rgb option

  24 juin 2017, par Paul B Mahol

  avfilter/vf_overlay : remove rgb option
  Its been deprecated for over 3 years.
  Signed-off-by : Paul B Mahol <onemda@gmail.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_overlay.c

• subprocess "TypeError : a bytes-like object is required, not 'str'" (Python 2 -> 3 issue maybe ?)

  8 juillet 2017, par chatbottest

  I’m using this code from a previously asked question a few years ago, however I believe this is outdated. Trying to run the code, I receive the error above. I’m still a novice in python, so I could not get much clarification from similar questions. Anyone know why this is happening ?

  import subprocess
  
  
  
  def getLength(filename):
  
    result = subprocess.Popen(["ffprobe", filename],
  
      stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
  
    return [x for x in result.stdout.readlines() if "Duration" in x]
  
  
  
  print(getLength('bell.mp4'))

  Traceback

  Traceback (most recent call last):
  
    File "B:\Program Files\ffmpeg\bin\test3.py", line 7, in <module>
  
      print(getLength('bell.mp4'))
  
    File "B:\Program Files\ffmpeg\bin\test3.py", line 6, in getLength
  
      return [x for x in result.stdout.readlines() if "Duration" in x]
  
    File "B:\Program Files\ffmpeg\bin\test3.py", line 6, in <listcomp>
  
      return [x for x in result.stdout.readlines() if "Duration" in x]
  
  TypeError: a bytes-like object is required, not 'str'
  
  </listcomp></module>