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• lavu : fix memory leaks by using a mutex instead of atomics

  14 novembre 2014, par wm4

  lavu : fix memory leaks by using a mutex instead of atomics
  The buffer pool has to atomically add and remove entries from the linked
  
  list of available buffers. This was done by removing the entire list
  
  with a CAS operation, working on it, and then setting it back again
  
  (using a retry-loop in case another thread was doing the same thing).
  This could effectively cause memory leaks : while a thread was working on
  
  the buffer list, other threads would allocate new buffers, increasing
  
  the pool’s total size. There was no real leak, but since these extra
  
  buffers were not needed, but not free’d either (except when the buffer
  
  pool was destroyed), this had the same effects as a real leak. For some
  
  reason, growth was exponential, and could easily kill the process due
  
  to OOM in real-world uses.
  Fix this by using a mutex to protect the list operations. The fancy
  
  way atomics remove the whole list to work on it is not needed anymore,
  
  which also avoids the situation which was causing the leak.
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DBH] libavutil/buffer.c
  • [DBH] libavutil/buffer_internal.h

• Revision c82de3bede : Extending ext_tx expt to include dst variants Extends the ext-tx experiment to

  15 novembre 2014, par Deb Mukherjee

  Changed Paths :
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_entropymode.c

  
   Modify /vp9/common/vp9_entropymode.h

  
   Modify /vp9/common/vp9_enums.h

  
   Modify /vp9/common/vp9_idct.c

  
   Modify /vp9/decoder/vp9_decodeframe.c

  
   Modify /vp9/decoder/vp9_decodemv.c

  
   Modify /vp9/encoder/vp9_bitstream.c

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_encodemb.c

  
   Modify /vp9/encoder/vp9_encoder.h

  
   Modify /vp9/encoder/vp9_rd.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Extending ext_tx expt to include dst variants

  Extends the ext-tx experiment to include regular and flipped
  DST variants. A total of 9 transforms are thus possible for
  each inter block with transform size <= 16x16.

  In this patch currently only the four ADST_ADST variants
  (flipped or non-flipped in both dimensions) are enabled
  for inter blocks.

  The gain with the ext-tx experiment grows to +1.12 on derflr.
  Further experiments are underway.

  Change-Id : Ia2ed19a334face6135b064748f727fdc9db278ec

• ffmpeg - creating segments of equivalent duration

  13 octobre 2014, par Code_Ed_Student

  I am testing out segment to split a video into segments of 10 seconds each, but I’m noticing some unusual results. In particular, some of the segments generated have varying lengths from 5 seconds to 11 seconds. I’ve tried playing around with segment_time_delta and force_key_frames to make the segments as close to 10 seconds as possible, but it doesn’t seem to be working out so well. How could I make all segments the same duration ?

  ffmpeg -i input.mp4 -force_key_frames 10,20,30,40,50,60,70,80,90,100,110,120 -c copy -map 0 -segment_time 10 -f segment output%01d.mp4

  Results :

  My_vid.mp4 – total duration - 00:02:08
  
  Output1.mp4 00:00:07
  
  Output2.mp4 00:00:07
  
  Output3.mp4 00:00:08
  
  Output4.mp4 00:00:08
  
  Output5.mp4 00:00:09
  
  Output6.mp4 00:00:09
  
  Output7.mp4 00:00:10
  
  Output8.mp4 00:00:10
  
  Output9.mp4 00:00:10
  
  Output10.mp4 00:00:11
  
  Output11.mp4  00:00:11
  
  Output12.mp4 00:00:11
  
  Output12.mp4 00:00:13