[FFmpeg-devel] FFmpeg TC input needed

[Gyan Doshi]

On 2024-02-17 05:31 pm, Kieran Kunhya wrote:
> On Sat, 17 Feb 2024, 11:46 Gyan Doshi,<ffmpeg at gyani.pro>  wrote:
>
>> Issue:
>>
>> Patch: avcodec/s302m: enable non-PCM decoding
>> URL:
>>
>> https://patchwork.ffmpeg.org/project/ffmpeg/patch/20240127103854.9971-1-ffmpeg@gyani.pro/
>>
>> The issue needing resolution is whether the patch should be added to the
>> existing s302m decoder or should that decoder
>> be removed and all old and new patched features inlined into the mpeg-ts
>> demuxer.
>>
> Additional comments:
>
> Dolby E can exist in any PCM container (wav, MP4). S302M just happens to be
> a tricky one.
>
> Whilst s302m multiple substreams I haven't seen, Dolby E streams internally
> contain multiple programs, often 5.1 and a 2.0 downmix.

That is downstream of the Dolby-E decoder and user will have to use a 
filter like channelsplit to bifurcate
those channels irrespective of where the s302m code resides.


> There is a 3x3 matrix of flavours between coded Dolby E and the carriage
> PCM (16-bit, 20-bit, 24-bit).

Have you seen a larger non-PCM word size inside a smaller AES3 word?

Regards,
Gyan