[FFmpeg-devel] [RFC/PATCH] MV-HEVC decoding

[James Almer]

On 9/13/2024 2:58 PM, Danny Hong wrote:
>   Quoting Anton Khirnov (2024-09-13 12:44:55)
>> Note that -view_ids is a decoder option and does nothing with
>> streamcopy.
>> Also, that option is intended for API users, with ffmpeg CLI you should
>> be using view specifiers instead.
> 
> Thanks!  Tried with "-map 0:v:view:all" and the result is the same.  The
> resulting elementary stream cannot be decoded by ffmpeg as the stream is
> not conformant.

Are you talking about decoding the resulting raw bitstream created from 
doing stream copy from the source mov? If so, what's happening is 
probably that the parser is splitting AUs when the second SEI with 
layer_id == 0 shows up in those non-conformant samples.
This doesn't happen if you try to decode directly from the mov as the 
parser does not attempt to do any packetization then.

> 
>> Use view specifiers to split the views into their own streams. I do not
>> want too much multiview-speficic logic into ffmpeg CLI, as it is a
>> rather obscure feature.
> 
> But the "-map 0:v:view:all" option is still available to output both views
> as a single stream with alternating views, no?
> Using "-map 0:v:vidx:0 -f rawvideo out0.yuv420p -map 0:v:vidx:1 -f rawvideo
> out1.yuv420p" to split the views into separate streams seems to work fine
> without the issues mentioned before.
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> 
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".

-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_signature.asc
Type: application/pgp-signature
Size: 495 bytes
Desc: OpenPGP digital signature
URL: <https://ffmpeg.org/pipermail/ffmpeg-devel/attachments/20240913/f80fbd3a/attachment.sig>