[FFmpeg-devel] [RFC] additinal desc_type for dtshd mpeg-ts demuxer

Måns Rullgård mans
Mon Jun 9 09:48:34 CEST 2008

"Ian Caulfield" <ian.caulfield at gmail.com> writes:

> 2008/6/9 Andreas ?man <andreas at olebyn.nu>:
>> M?ns Rullg?rd wrote:
>>> Is it correct to use the same codec id?  Can AC3/DTS decoders in
>>> general handle all the variants?  Might an lavf-using app want to
>>> distinguish between them?
>> IEC958 (SPDIF) comes to mind.
>> You might want to configure AC3, DTS, etc to be sent directly to a AV
>> receiver, but such receiver might not be able to decode DTS HD and such,
>> so it is necessary to be able to distinguish between the variants.
>> Ether we could add more codec IDs or use sub_id. Dunno what's best
>> though.
> I think DTS is meant to fallback nicely - a decoder that can handle
> DTS but not DTS-HD should be able to decode a DTS-HD stream as just
> 1.5mbs DTS and ignore the extra data... not sure if that's true in
> practice though!

However that may be, it still means losing data.  In such a situation
I'd want to use a software decoder for DTS-HD streams.

M?ns Rullg?rd
mans at mansr.com

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