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• Converting DAV to MP4 and OGG

  27 mars 2015, par mackowiakp

  I want to prepare WEB page containing films from security camera recorders. Each recorder transmit video files in DAV format so each film is converted to MP4 format by script, using such syntax :

  ffmpeg -y -i movie.dav -vcodec libx264 -crf 24 movie.mp4

  So I included in HTMLv5 code such entry :

   <video width="320" height="240">
  
    <source src="movie.mp4" type="video/mp4">
  
  </source></video> 

  It works correctly with Chrome but not with Firefox. For proper work in FF it is necessary add link to OGG file. So correct HTMLv5 syntax for both browsers should look like this :

   <video width="320" height="240">
  
    <source src="movie.mp4" type="video/mp4">
  
    <source src="movie.ogg" type="video/ogg">
  
  </source></source></video>

  Can anybody help me to pass correct ffmpeg syntax to create OGG file ?

  Output from console after using -movflags +faststart options

  [maciek@piotr MMM]$ ../ffmpeg-2.4.2-64bit-static/ffmpeg -movflags +faststart -y -i   04.24.23-04.24.38\[M\]\[@0\]\[0\].dav -vcodec libx264 -crf 24 10.mp4
  
  ffmpeg version 2.4.2-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Oct  9 2014 07:24:56 with gcc 4.8 (Debian 4.8.3-11)
  
    configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable- libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --disable-ffserver --enable-libass --enable-gnutls --cc=gcc-4.8
  
    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  1.100 / 56.  1.100
  
    libavformat    56.  4.101 / 56.  4.101
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  1.100 /  5.  1.100
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  0.100 / 53.  0.100
  
  Option movflags not found.

• It's possible to catch ffmpeg errors with python ?

  4 avril 2019, par Elros Romeo

  Hi I’m trying to make a video converter for django with python, I forked django-ffmpeg module which does almost everything I want, except that doesn’t catch error if conversion failed.

  Basically the module passes to the command line interface the ffmpeg command to make the conversion like this :

  /usr/bin/ffmpeg -hide_banner -nostats -i %(input_file)s -target
  film-dvd %(output_file)

  Module uses this method to pass the ffmpeg command to cli and get the output :

  def _cli(self, cmd, without_output=False):
  
      print 'cli'
  
      if os.name == 'posix':
  
          import commands
  
          return commands.getoutput(cmd)
  
      else:
  
          import subprocess
  
          if without_output:
  
              DEVNULL = open(os.devnull, 'wb')
  
              subprocess.Popen(cmd, stdout=DEVNULL, stderr=DEVNULL)
  
          else:
  
              p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  
              return p.stdout.read()

  But for example, I you upload an corrupted video file it only returns the ffmpeg message printed on the cli, but nothing is triggered to know that something failed

  This is an ffmpeg sample output when conversion failed :

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x237d500] Format mov,mp4,m4a,3gp,3g2,mj2
  detected only with low score of 1, misdetection possible !
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x237d500] moov atom not found
  /home/user/PycharmProjects/videotest/media/videos/orig/270f412927f3405aba041265725cdf6b.mp4 :
  Invalid data found when processing input

  I was wondering if there’s any way to make that an exception and how, so I can handle it easy.

  The only option that came to my mind is to search : "Invalid data found when processing input" in the cli output message string but I’m not shure that if this is the best approach. Anyone can help me and guide me with this please.

• vulkan_decode : use a single execution pool

  3 décembre 2024, par Lynne

  vulkan_decode : use a single execution pool
  Originally, the decoder had a single execution pool, with one
  
  execution context per thread. Execution pools were always intended
  
  to be thread-safe, as long as there were enough execution contexts
  
  in the pool to satisfy all threads.
  Due to synchronization issues, the threading part was removed at some
  
  point, and, for decoding, each thread had its own execution pool.
  
  Having a single execution pool per context is hacky, not to mention
  
  wasteful.
  
  Most importantly, we *cannot* associate single shaders across multiple
  
  execution pools for a single application. This means that we cannot
  
  use shaders to either apply film grain, or use this framework for
  
  software-defined decoders.
  The recent commits added threading capabilities back to the execution
  
  pool, and the number of contexts in each pool was increased. This was
  
  done with the assumption that the execution pool was singular, which
  
  it was not. This led to increased parallelism and number of frames
  
  in flight, which is taxing on memory.
  This commit finally restores proper threading behaviour.
  
  The validation layer has isses that are reported and addressed in the
  
  earlier commit.
  

  • [DH] libavcodec/vulkan_decode.c
  • [DH] libavcodec/vulkan_decode.h