[FFmpeg-devel] [PATCH] [RFC] libavformat/mpegts: Prevent wrapping of PTS & DTS

DeHackEd git at dehacked.net
Sun Jun 12 20:07:00 CEST 2016

On 06/12/2016 01:57 PM, Carl Eugen Hoyos wrote:
> DeHackEd <git <at> dehacked.net> writes:
>>> So the bug is that the file gets longer when read with FFmpeg?
>> Heh... that's my fault for copy/pasting from the wrong invocation. 
>> I have two test cases, one generated from the above testsrc and 
>> one that actually consists of a 28+ hour recording from a real TV 
>> source. It's a "real world" scenario but the file is about 90 
>> gigabytes.
> I am both able to record arbitrarily long mpegts files and to run 
> FFmpeg to produce long samples.
> But my question is: What goes wrong with the file?
> And how can I reproduce this with a self-produced (or self-
> recorded) file?

The effects vary a bit. One guy in IRC basically had ffmpeg crash for him every 26.5 hours when he was saving to HLS - I
don't have his actual output on me right now. I have an libav* application fail because av_write_frame() returns an
error when the DTS moves backwards.

Based on chatting with other people in #ffmpeg-devel it seemed like it was best to implement this correction into the
demuxers themselves. Now it seems fixing libavformat/utils.c user functions may be the better way to go based on this
thread so far.

> Carl Eugen
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