Branch: refs/heads/master
Home: https://github.com/mltframework/mlt
Commit: 1fc469fa90d2ba416b82c76300c7773061bd160c
https://github.com/mltframework/mlt/commit/1fc469fa90d2ba416b82c76300c7773061bd160c
Author: Dan Dennedy <d...@dennedy.org>
Date: 2018-05-25 (Fri, 25 May 2018)
Changed paths:
M src/modules/avformat/producer_avformat.c
Log Message:
-----------
Fix improper sync on audio files with discard packets.
Fixes https://github.com/mltframework/shotcut/issues/571
On the sample file provided, I noticed AVPacket timestamps were
fluctuating a lot, which caused the avformat producer to discard many
decoded samples. Then, I noticed that some packets were marked with a
flag AV_PKT_FLAG_DISCARD, which is a somewhat new flag:
Flag is used to discard packets which are required to maintain valid
decoder state but are not required for output and should be dropped
after decoding.
But I noticed none of the ff tools use this flag, and I noticed that it
factors into the got_frame_ptr parameter on avcodec_decode_audio4(). A
packet with this flag yields 0 for got_frame_ptr. Thus, if that parameter
is always 0 for this packet I should consider it discarded and not
factor its PTS into the synchronization logic.
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