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• How to install ffmpeg on Google App Engine ?

  3 mai 2020, par UtkuBulkan

  I intend to install ffmpeg and ffprobe to my Google App Engine flex environment, how can I do this with requirements.txt as a package ?

  



  I am currently using ffmpeg-python yet, this is only a wrapper.

  



  ffmpeg-python==0.2.0
ffprobe-python==1.0.3


  



  Below is the error when I try to use ffmpeg-python wrapper, which is expected as there is no ffmpeg and ffprobe available :

  



  2020-05-03 11:42:36 default[20200503t112932]  [03/May/2020 11:42:36] ERROR    [log.py:228] Internal Server Error: /capture_thumbnail/
2020-05-03 11:42:36 default[20200503t112932]  Traceback (most recent call last):    File "/env/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner      response = get_response(request)    File "/env/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response      response = self.process_exception_by_middleware(e, request)    File "/env/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response      response = wrapped_callback(request, *callback_args, **callback_kwargs)    File "/home/vmagent/app/core/views.py", line 62, in capture_thumbnail      generate_thumbnail(request, blob_uuid)    File "/home/vmagent/app/core/videointelligence1.py", line 264, in generate_thumbnail      probe = ffmpeg.probe(video_url)    File "/env/lib/python3.6/site-packages/ffmpeg/_probe.py", line 20, in probe      p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)    File "/opt/python3.6/lib/python3.6/subprocess.py", line 729, in __init__      restore_signals, start_new_session)    File "/opt/python3.6/lib/python3.6/subprocess.py", line 1364, in _execute_child      raise child_exception_type(errno_num, err_msg, err_filename)  FileNotFoundError: [Errno 2] No such file or directory: 'ffprobe': 'ffprobe'


  



  Can you please suggest a way, so I can use ffprobe on Google App Engine.

  


• fftools/ffmpeg : replace MATCH_PER_STREAM_OPT(.., str, ..) with a function

  6 août 2024, par Anton Khirnov

  fftools/ffmpeg : replace MATCH_PER_STREAM_OPT(.., str, ..) with a function
  This has multiple advantages :
  
  * The macro has multiple parameters that often have similar or identical
  
    values, yet very different meanings (one is the name of the
  
    OptionsContext member where the parsed options are stored, the other
  
    the name of the variable into which the result is written) ; this
  
    change makes each of these explicit.
  * The macro returns on failure, which may cause leaks - this was the
  
    reason for adding MATCH_PER_STREAM_OPT_CLEAN(), also ost_add()
  
    currently leaks encoder_opts. The new function returns failure to its
  
    caller, which decides how to deal with it. While that adds a lot of
  
    error checks/forwards for now, those will be reduced in following
  
    commits.
  * new code is type- and const- correct
  Invocations of MATCH_PER_STREAM_OPT() with other types will be converted
  
  in following commits.
  

  • [DH] fftools/cmdutils.c
  • [DH] fftools/cmdutils.h
  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_demux.c
  • [DH] fftools/ffmpeg_mux.h
  • [DH] fftools/ffmpeg_mux_init.c
  • [DH] fftools/ffmpeg_opt.c

• How to use hardware accelearation with ffmpeg

  25 avril 2014, par ixSci

  I need to have ffmpeg decode my video(e.g. h264) using hardware acceleration. I’m using the usual way of decoding frames : read packet -> decode frame. And I’d like to have ffmpeg speed up decoding. So I’ve built it with --enable-vaapi and --enable-hwaccel=h264. But I don’t really know what should I do next. I’ve tried to use avcodec_find_decoder_by_name("h264_vaapi") but it returns nullptr.
  Anyway, I might want to use others API and not just VA API. How one is supposed to speed up ffmpeg decoding ?

  P.S. I didn’t find any examples on Internet which uses ffmpeg with hwaccel.