[FFmpeg-devel] [PATCH] avformat/mpegts: add skip_unknown_pmt option

Aman Gupta aman at tmm1.net
Fri May 18 20:43:19 EEST 2018

On Fri, May 18, 2018 at 10:28 AM, Devin Heitmueller <
dheitmueller at kernellabs.com> wrote:

> > The issue is that the PMT PID advertised in the PAT contains multiple
> PMTs
> > for different programs. This is because the broadcaster decided to re-use
> > the same PID for multiple program PMTs.
> Ugh, ok.  I understand the case you're talking about now.  Thanks for
> clarifying.
> > To be clear, this issue is specific to _filtered_ mpegts streams. In this
> > case, my tuner hardware is trying to filter the mpegts stream from the
> > broadcaster to include only the program I care about.
> This is actually what I assumed, but I thought you were referring to
> the broken behavior found in some of the LinuxTV command line tools
> which allow you to save the TS but they don't include the PAT in the
> list of filtered PIDs.
> Now that I understand what you're trying to do, the approach you've
> proposed makes sense.  I withdrawal any objections.


I'll try to expand the commit message to make it more clear before

FYI, the way ffmpeg deals with missing PAT/PMT is by automatically creating
streams for any PIDs that appear containing PES streams.

In this case, those extra pids are not in the file, so the streams were
only getting created because of the erroneous PMTs being seen.


> Devin
> --
> Devin J. Heitmueller - Kernel Labs
> http://www.kernellabs.com

More information about the ffmpeg-devel mailing list