On 24/03/2024 15:48, Mark Filipak wrote:
I cut at the end of an open GOP. When I did that, FFmpeg did not set the MPEG
'broken_link' flag to '1'.
The frame following the cut has to be flagged:
'closed_gop' = '0' because it's an open GOP, also, and
'broken_link' = '1'.
How do I do that? I searched but did not find.
The ffmpeg utility does not edit the internals of the bitstream when cutting
(packets are effectively opaque to it); you would need a BSF to make this
change.
Making such a BSF should be straightforward: use CBS BSF with a single
update_fragment function which edits the GOP header on any I frame with a
discontinuity before it.
- Mark
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