[FFmpeg-devel] Can BSF delay packets?

[Aleksey M]

Hi Ronald.

Thank you for replying!

If I return 0 -- how the calling function determines that I've produced an
output packet?

What do I do to signal caller that I don't want to produce an output packet?

On Mon, Feb 6, 2017 at 3:42 PM, Ronald S. Bultje <rsbultje at gmail.com> wrote:

> Hi Aleksey,
>
> On Mon, Feb 6, 2017 at 5:18 AM, Aleksey M <hex000 at gmail.com> wrote:
>
> > Hi dear FFMPEG contributors,
> >
> > Does the bitstream filter (BSF) interface allow to delay packets?
> >
> > From Luca's description
> > https://blogs.gentoo.org/lu_zero/2016/03/21/bitstream-filtering/
> > it looks like it can produce any number of output packets or consume any
> > number of input packets.
> >
> > But any attempt to return AVERROR(EAGAIN) results in FFMPEG interrupting
> > processing saying 'Timestamps are unset in a packet...H.264 bitstream
> > malformed".
> >
> > Could anyone point me in the right direction? Or give a working example
> of
> > just delaying by a single packet?
> >
> > For example, should this filter consume all input packets without
> producing
> > output?
> >
> >     AVPacket* in = NULL;
> >     int result = ff_bsf_get_packet(ctx, &in);
> >
> >     if (result < 0)
> >         return result;
> >
> >     av_packet_free(&in);
> >     return AVERROR(EAGAIN);
> >
> > But it interrupts processing.
>
>
> Just return 0, not EAGAIN. Delay is allowed, yes.
>
> Ronald
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