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

[Aman Gupta]

On Fri, May 18, 2018 at 10:43 AM, Aman Gupta <aman at tmm1.net> wrote:

>
>
> 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.
>>
>
> Thanks.
>
> I'll try to expand the commit message to make it more clear before
> committing.
>

Updated commit message and applied as-is (off by default).

Aman


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