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Nov 7, 2009, 10:12 PM
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Ticket #7521: [PATCH] AVFormatDecoder: Seeking Improvements
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#7521: [PATCH] AVFormatDecoder: Seeking Improvements
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Reporter: tralph11@… | Owner: janne
Type: patch | Status: new
Priority: minor | Milestone: unknown
Component: MythTV - Video Playback | Version: head
Severity: medium | Mlocked: 0
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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
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Ticket URL: <http://svn.mythtv.org/trac/ticket/7521>
MythTV <http://www.mythtv.org/>
MythTV
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