[FFmpeg-devel] [RFC/PATCH] Pass PRIVATE_STREAM_2 MPEG-PS packets to caller

Paul B Mahol onemda at gmail.com
Sun Feb 24 21:04:35 CET 2013

On 2/24/13, Richard <peper03 at yahoo.com> wrote:
> On 18/02/13 07:24, Richard wrote:
>> Hi,
>> In order to improve DVD playback, I need the DVD NAV packets in-sync
>> with the other audio/video/subtitle packets.  The information is stored
>> in 'PRIVATE_STREAM_2' MPEG-PS packets (startcode 0x1bf), which are
>> currently filtered out.
>> The attached patch adds a new codec ID 'AV_CODEC_ID_PRIVATE_STREAM_2' to
>> identify these packets.
>> The contents of these packets is clear for DVDs but looking at the
>> existing code, it appears that Dreamcast videos (Sofdec) also use this
>> startcode but for other purposes, so I'm not sure it's feasible to
>> create any sort of decoder for these packets.  As it is, the patch
>> simply returns the contents of the packet unchanged.  It is up to the
>> calling application to process the contents.
>> All comments welcome.
> Any comments on this?
> After more testing, I see that the 'new' packets are not quite in sync
> with the audio and video packets due to the buffering performed on those
> packets and not on these data packets, but the packets do at least come
> through, and they come through, at worst, before they are actually
> needed rather than (potentially) afterwards if trying to read them via
> other routes.

Perhaps thay should have pts/dts/duration set?

> Is it necessary/desirable to explicitly give these packets a FOURCC?
> Richard.
> Richard.
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