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

[Ronald S. Bultje]

Hi,

On Sun, Jun 12, 2016 at 8:23 AM, Michael Niedermayer <michael at niedermayer.cc
> wrote:

> On Sat, Jun 11, 2016 at 06:55:32PM -0400, DeHackEd wrote:
> > Presently the mpegts demuxer passes the timestamps from received packets
> directly to the output AVPackets. 2^33 / 90000
> > seconds is about 26.5 hours at which point applications start having a
> fit, and that's assuming timestamps begin at time 0.
> >
> > So here's a first revision of a patch to fix that issue.
> >
> > Improvements possible:
> > * In its current form intended for continuous sources like over-the-air
> receivers and multicast sources. When used on
> > files there will be problems with seeking.
> > * Constants such as 2^33 could be turned into macros for readability
>
> >  mpegts.c |   56 ++++++++++++++++++++++++++++++++++++++++++++++++--------
> >  1 file changed, 48 insertions(+), 8 deletions(-)
> > b95c5f58685106dab1f434a3bb465ad5a0ba1636  new-pts-dts.patch
> > From d06a3bd39fc4f01b9ce6132d80634dd31be7b1aa Mon Sep 17 00:00:00 2001
> > From: DHE <git at dehacked.net>
> > Date: Mon, 30 May 2016 18:31:43 -0400
> > Subject: [PATCH] libavformat/mpegts: Prevent wrapping of PTS & DTS
>
> this could cause issues with seeking (as the same packet could
> result in different timestamps depending on luck) as well as subtitles
> (which could get misidentified as wraps)


How does that work before the patch?

Ronald