[FFmpeg-devel] [PATCH] avcodec/jpeg2000dec: support of 2 fields in 1 AVPacket

[Marton Balint]

On Fri, 16 Feb 2024, Anton Khirnov wrote:

> Quoting Tomas Härdin (2024-02-03 20:58:20)
>> I think people with knowledge how interlacing is handled in other
>> formats and codecs might want to chime in.
>
> For MPEG codecs our decoders always output (properly signalled)
> interlaced content as two interleaved fields in a single AVFrame flagged
> with AV_FRAME_FLAG_INTERLACED. Its height is the height of the whole
> frame, so double the number of lines in each field.
>
> So IIUC this patch is taking the correct approach.

I believe interlaced HEVC has the same issue, the decoder generates field 
pictures and not frames. Would changing the HEVC decoder be acceptable to 
generate frames with interleaved fields?

Regards,
Marton