[FFmpeg-devel] [PATCH] avformat/avienc: fix fields-per-frame value for interlaced video streams

[Derek Buitenhuis]

On 11/22/2017 3:41 PM, Tobias Rapp wrote:
> Writes one set of field framing information for progressive streams and
> two sets for interlaced streams. Fixes ticket #6383.
> 
> Unfortunately the OpenDML v1.02 document is not very specific what value
> to use for start_line when frame data is not coming from a capturing
> device, so this is just using 0/1 depending on the field order as a
> best-effort guess.

Looking at the OpenDML spec, I think this indeed is the best we can do without
deeper knowledge of where the source signal came from, or copying it from a
pre-existing file, within the existing avformat scaffolding.

Code itself seems OK.

- Derek