[FFmpeg-trac] #6586(avcodec:new): motion using h264_omx hangs on Raspberry Pi

FFmpeg trac at avcodec.org
Mon Aug 14 07:33:43 EEST 2017

#6586: motion using h264_omx hangs on Raspberry Pi
             Reporter:  jasaw          |                    Owner:
                 Type:  defect         |                   Status:  new
             Priority:  normal         |                Component:  avcodec
              Version:  git-master     |               Resolution:
             Keywords:  h264_omx, omx  |               Blocked By:
             Blocking:                 |  Reproduced by developer:  0
Analyzed by developer:  0              |

Comment (by jasaw):

 It appears that whenever the zerocopy condition in omx.c is satisfied
 (contiguous planes and stride alignment), the call to OMX_EmptyThisBuffer
 hangs. 1280 x 720 resolution images captured from the Pi camera happens to
 meet that condition.

 This explains why it works when zerocopy is disabled.

Ticket URL: <https://trac.ffmpeg.org/ticket/6586#comment:1>
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