Add timecode field to FFmpegStream

[smedelyan]

Describe the solution you'd like When I run:

ffprobe -show_streams <some_media>

I get something like timecode=N/A, but FFmpegStream does not even have this field. According to FFmpeg docs:

• MPEG1/2 timecode is extracted from the GOP, and is available in the video stream details (-show_streams, see timecode)
• MOV timecode is extracted from tmcd track, so is available in the tmcd stream metadata (-show_streams, see TAG:timecode).
• DV, GXF and AVI timecodes are available in format metadata (-show_format, see TAG:timecode).

While I have access to tags (TAG:timecode), I still cannot access videoStream.timecode.

Describe alternatives you've considered Can't think of any. Rather rewrite cli wrapper or extract timecode from the GOP myself :)