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videodecoder: Avoid pushing buffers before segment start

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In the case where the stream doesn't have a framerate set and the frames
don't have a duration set, we still want to use the clipping path to
make sure we don't push buffers outside of the segment.

The problem was the previous iteration was setting a duration of 2s, which
meant that any buffer which was less than 2s before the segment start would
end up getting pushed.

Instead, use a saner 40ms (25fps single frame duration) to figure out whether
the frame could be within the segment or not
This commit is contained in:
Edward Hervey 2015-12-03 16:38:45 +01:00 committed by Edward Hervey
parent 4ed7b0a0e6
commit d34aaf9e9b
1 changed files with 7 additions and 7 deletions
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14
gst-libs/gst/video/gstvideodecoder.c
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@ -3128,16 +3128,16 @@ gst_video_decoder_clip_and_push_buf (GstVideoDecoder * decoder, GstBuffer * buf)
stop = start + duration; stop = start + duration;
} else if (GST_CLOCK_TIME_IS_VALID (start) } else if (GST_CLOCK_TIME_IS_VALID (start)
&& !GST_CLOCK_TIME_IS_VALID (duration)) { && !GST_CLOCK_TIME_IS_VALID (duration)) {
/* 2 second frame duration is rather unlikely... but if we don't clip /* If we don't clip away buffers that far before the segment we
* away buffers that far before the segment we can cause the pipeline to * can cause the pipeline to lockup. This can happen if audio is
* lockup. This can happen if audio is properly clipped, and thus the * properly clipped, and thus the audio sink does not preroll yet
* audio sink does not preroll yet but the video sink prerolls because * but the video sink prerolls because we already outputted a
* we already outputted a buffer here... and then queues run full. * buffer here... and then queues run full.
* *
* In the worst case we will clip one buffer too many here now if no * In the worst case we will clip one buffer too many here now if no
* framerate is given, no buffer duration is given and the actual * framerate is given, no buffer duration is given and the actual
* framerate is less than 0.5fps */ * framerate is lower than 25fps */
stop = start + 2 * GST_SECOND; stop = start + 40 * GST_MSECOND;
} }
segment = &decoder->output_segment; segment = &decoder->output_segment;