[mythtv-commits] Ticket #7521: [PATCH] AVFormatDecoder: Seeking Improvements

[MythTV]

#7521: [PATCH] AVFormatDecoder: Seeking Improvements
-------------------------------------+--------------------------------------
 Reporter:  tralph11@…               |       Owner:  janne  
     Type:  patch                    |      Status:  new    
 Priority:  minor                    |   Milestone:  unknown
Component:  MythTV - Video Playback  |     Version:  head   
 Severity:  medium                   |     Mlocked:  0      
-------------------------------------+--------------------------------------
 This patch addresses issues related to libav seeking. Here are a few key
 points related to the patch.

  * We should only use exact seeks when doing frame-by-frame seeking. It is
 way to slow to perform exact seeks when doing FF/REW.

  * Since we don't perform exact seeks for FF/REW it is important to set or
 clear the AVSEEK_FLAG_BACKWARD to avoid getting stuck in an infinite loop.

  * Always flush the buffers when performing a seek.

  * Please note that MPEG-TS seeking is currently slow so except for FF3X
 all other FF/REW speeds should be avoided. This is due to the fact that
 seeking in this container jumps back repeatedly causing the MythTV
 RingBuffer protocol to rebuffer which is a high latency action. Apparently
 MPEG-TS seeking is being improved by the FFmpeg devs. Another option to
 improve performance is to use the 'file' protocol instead of the 'rbuffer'
 protocol.

 Refs #7252, #7397, #7454

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/7521>
MythTV <http://www.mythtv.org/>
MythTV