[FFmpeg-devel] [PATCH] Add new MPEG bitstream filter

[David Griffiths]

Hi, that certainly does sound as though it does the same as my patch plus
more. I will download libav and have a play.

Cheers,

David

On Tue, 1 Aug 2017 at 20:59, Mark Thompson <sw at jkqxz.net> wrote:

> On 01/08/17 19:05, Jan Ekstrom wrote:
> > Hi,
> >
> > On Tue, Aug 1, 2017 at 3:22 PM, David Griffiths
> > <david.griffiths at gmail.com> wrote:
> >> Given an MPEG1/2 stream, this bitstream filter can be used to modify
> >> the sequence headers. The most common use would be to change the
> >> aspect ration without the need for re-encoding. Some MOD files have
> >> the aspect ratio incorrectly set to 4:3
> >> (see https://en.wikipedia.org/wiki/MOD_and_TOD).
> >
> > Thanks for the contribution, but this looks like a limited version of
> > https://lists.libav.org/pipermail/libav-devel/2017-July/084528.html ,
> > which seems to contain support for MPEG-2 bit stream filtering as
> > well.
> I'm intending to bring this across myself soon.  It's slightly awkward
> because it's all written against Alexandra's bitstream API and would need
> to be changed to get_bits here.  (I was hoping the API would come at some
> point, but apparently people here are generally against it.  Oh well.)
>
> Anyway, I finished off a half-written MPEG-2 metadata filter which will do
> the stuff described here: <
> https://lists.libav.org/pipermail/libav-devel/2017-August/084563.html>.
> I've ignored MPEG-1 so far, but it would probably be easy to add if anyone
> cares.
>
> - Mark
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