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• exporting ogg videos from video slideshow (mp4) and audio (wav) using ffmpeg in python

  17 septembre 2018, par jtz

  I have tried to find a solution already, but just cannot make it work. I want to export an .ogg-video by combining a video slideshow (mp4) with an audio file (wav) by using ffmpeg in python. The audio is shorter than the video and should have an offset of 2000 milliseconds, so that it starts approximately in the middle of the video. The code that I tried is essentially this :

  subprocess.call(’ffmpeg.exe -itsoffset 0 -i slideshows/slideshow.mp4 -itsoffset 2000 -i sounds/audio.wav -codec:v libtheora -codec:a libvorbis output.ogg’, shell= True)

  FYI : I need to create a couple of different video formats from the video and audio input, so substituting the ogg with a different format is no option. I have already successfully created .mp4-video-files and .webm-video-files from the material, but need the .ogg in addition. Also, Power Point does not like any of the exported videos, maybe this might be relevant for finding the problem here (I also unsuccessfully tried to fix this issue).

• Revision 399823b6f5 : Add support for setting byte alignment. Add support for setting byte alignment

  13 novembre 2014, par Frank Galligan

  Changed Paths :
   Add /test/byte_alignment_test.cc

  
   Modify /test/decode_test_driver.h

  
   Modify /test/test.mk

  
   Modify /vp9/common/vp9_alloccommon.c

  
   Modify /vp9/common/vp9_onyxc_int.h

  
   Modify /vp9/decoder/vp9_decodeframe.c

  
   Modify /vp9/encoder/vp9_denoiser.c

  
   Modify /vp9/encoder/vp9_encoder.c

  
   Modify /vp9/encoder/vp9_lookahead.c

  
   Modify /vp9/encoder/vp9_svc_layercontext.c

  
   Modify /vp9/encoder/vp9_temporal_filter.c

  
   Modify /vp9/vp9_dx_iface.c

  
   Modify /vpx/vp8dx.h

  
   Modify /vpx_scale/generic/yv12config.c

  
   Modify /vpx_scale/yv12config.h

  
  
  Add support for setting byte alignment.

  Add support for setting byte alignment on the Y, U, and V plane of the
  reference buffers. The byte alignment must be a power of 2, from 32 to
  1024. A value of 0 sets legacy alignment.

  Change-Id : I7c1399622f7aa68e123646369216b32047dda73d

• vc2enc : zero padding of the coefficient buffer

  17 décembre 2019, par Lynne

  vc2enc : zero padding of the coefficient buffer
  Wavelet types with large amounts of overreading/writing like 9_7 would
  
  write into the padding at high wavelet depths, which would remain and be
  
  read by the next frame's transform and quickly cause artifacts to appear
  
  for subsequent frames.
  
  This fix affects all frames encoded with a non-power-of-two width, with
  
  the artifacts varying between non-observable to very noticeable,
  
  depending on encoder settings, so reencoding is advisable.
  

  • [DH] libavcodec/vc2enc.c