Extend ffmpeg's timecode extraction

[nichot20]

Whilst many formats support adding timecode with the -timecode feature currently only the GXF format supports presenting this timecode in the metadata, with mpeg being read using the new ffprobe feature from commit fbe6e29646582fb97317ff3e7214a04ae74c9bef

For consistency it would be good if all formats for which it is valid to present a -timecode value to the muxer allowed extracting that timecode in the demuxer.

Ideally both reading and writing of timecode should be extended to all those formats that support it, which would include mxf and mov.

Given that "burnt in" timecode can now be added to any format using the drawtext filter. This would complete ffmpeg's capabilities in this area.

[ubitux]

Just an update of the current state: read is supported by all the common formats except MXF, and write by all the common formats except MOV (http://ffmpeg.org/general.html#Timecode).

[naud]

Also read not supported for DV S314M video files

[ubitux]

Could you share a sample?

[nichot20]

Replying to ubitux:

Just an update of the current state: read is supported by all the common formats except MXF, and write by all the common formats except MOV (http://ffmpeg.org/general.html#Timecode).

MXF is now supported since ad029c2....

[cehoyos]

Do we have a DV S314M sample that needs this enhancement?

[naud]

Sample DV S314M video files:

•  http://tinyurl.com/6p5njvf : record/start timestamp is 20:23:03:12
•  http://tinyurl.com/6p9mtu3 : record/start timestamp is 17:30:15:01