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• hevc : Remove useless clip

  11 janvier 2014, par Guillaume Martres

  hevc : Remove useless clip
  The src buffer should only contain values in the interval
  
  [0, (1 << BIT_DEPTH) - 1].
  Since shift = (BIT_DEPTH - 5), src[x] >> shift must be in
  
  the interval [0, 31], so no clip is needed.
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DH] libavcodec/hevcdsp_template.c

• Revision bdd7f74c3f : Added initial support for 16-bit framebuffers. Changes in this patch are only e

  22 avril 2014, par Peter de Rivaz

  Changed Paths :
   Modify /configure

  
   Modify /vp9/common/vp9_alloccommon.c

  
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_common.h

  
   Modify /vp9/common/vp9_convolve.c

  
   Modify /vp9/common/vp9_convolve.h

  
   Modify /vp9/common/vp9_idct.c

  
   Modify /vp9/common/vp9_idct.h

  
   Modify /vp9/common/vp9_loopfilter.c

  
   Modify /vp9/common/vp9_loopfilter_filters.c

  
   Modify /vp9/common/vp9_onyxc_int.h

  
   Modify /vp9/common/vp9_reconinter.c

  
   Modify /vp9/common/vp9_reconinter.h

  
   Modify /vp9/common/vp9_reconintra.c

  
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/common/vp9_scale.c

  
   Modify /vp9/common/vp9_scale.h

  
   Modify /vp9/decoder/vp9_decodeframe.c

  
   Modify /vp9/encoder/vp9_aq_variance.c

  
   Modify /vp9/encoder/vp9_dct.c

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_encodemb.c

  
   Modify /vp9/encoder/vp9_encoder.c

  
   Modify /vp9/encoder/vp9_encoder.h

  
   Modify /vp9/encoder/vp9_extend.c

  
   Modify /vp9/encoder/vp9_firstpass.c

  
   Modify /vp9/encoder/vp9_lookahead.c

  
   Modify /vp9/encoder/vp9_lookahead.h

  
   Modify /vp9/encoder/vp9_mcomp.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
   Modify /vp9/encoder/vp9_sad.c

  
   Modify /vp9/encoder/vp9_temporal_filter.c

  
   Modify /vp9/encoder/vp9_variance.c

  
   Modify /vp9/encoder/vp9_variance.h

  
   Modify /vp9/vp9_cx_iface.c

  
   Modify /vp9/vp9_iface_common.h

  
   Modify /vpx/src/vpx_encoder.c

  
   Modify /vpx/src/vpx_image.c

  
   Modify /vpx/vp8cx.h

  
   Modify /vpx/vpx_encoder.h

  
   Modify /vpx/vpx_image.h

  
   Modify /vpx_mem/vpx_mem.c

  
   Modify /vpx_mem/vpx_mem.h

  
   Modify /vpx_scale/generic/yv12config.c

  
   Modify /vpx_scale/generic/yv12extend.c

  
   Modify /vpx_scale/yv12config.h

  
   Modify /vpxdec.c

  
   Modify /vpxenc.c

  
  
  Added initial support for 16-bit framebuffers.

  Changes in this patch are only enabled if configured with
  — enable-experimental —enable-vp9_high

  Using a encoder command line argument of —input-shift=0 tells the coder
  to work with 16bit framebuffers.
  The output should be identical to before. Some features (such as input
  image resizing) are not yet supported in 16bit mode.

  Specifically, the behavior of the input-shift parameter is as follows :
  * No argument : Behaviour as before, using 8bit frame buffers
  * —experimental-bitstream —profile=2 —input-shift=0 : Uses
  16bit frame buffers to store 8-bit data, should give identical output
  to before.
  * —experimental-bitstream —profile=2 —input-shift=2 —bit-depth=1 : Uses
  16bit frame buffers to store 10-bit data, encodes a version 2 stream
  with bitdepth 10
  * —experimental-bitstream —profile=2 —input-shift=4 —bit-depth=2 : Uses
  16bit frame buffers to store 12-bit data, encodes a version 2 stream
  with bitdepth 12

  The decoder has an —output-shift argument which should be used when
  decoding profile 2 streams.

  So far support for the following has been added :
  Intra filtering
  Deblocking
  Motion compensation
  Variance calculation
  Sad calculation
  Transform

  Change-Id : If345c88234aafdd40caea0d88935b1f07aaebe22

• Shifting audio in MPEG4 content and manipulating atoms

  10 janvier 2018, par LLL

  1. Shift audio

  I use ffmpeg / avconv quite often ... and usually I hate it.
  Those tools do what they are instructed to do about 30% of the time. I could give you countless examples but I don’t want to start flame war, so please help me with my current problem (really easy one).

  I wanted to shift audio (content is standard mp4 file with aac and h264 tracks), so I have found a "highly upvoted" solution :

  https://superuser.com/a/983153/758887

  the only problem with it is that it doesn’t work. I downloaded latest stable ffmpeg (even on windows as in the thread, so it’s version was 3.4.1) and executed command without changing literaly anything :

  ffmpeg.exe -i "movie.mp4" -itsoffset 3.84 -i "movie.mp4" -map 0:v -map 1:a -vcodec copy -acodec copy "movie-audio-delayed.mp4"

  Result was no shift (I expected audio to be 3.84s late).

  2. Remove MPEG4 atoms

  I would be also grateful if you could recommend some tool for removing MPEG4 boxes from content. For examining MPEG4 content I use MP4 Explorer / Codec Visa (limited) on Windows and AtomicParsley on Linux, however they only print atoms and I would like to edit / remove them. For example MP4Box can remove whole moov->track with "-rem" option but what if I would like to remove moov->track->edts only ?