![]() ![]() I had bunch of op1a/as02 files containing captions track inside, sure what I did firts is made dump to reverse structure.Īny CDP should have header which starts with MAGIC 0x9669 so to read you dont even have to understand structure (in case you dont need afd or so) its enough to go through data after Captions Essence Element key and find CDP header start, but its not enough if you want to write captions or you want todo everything right.Ĭaptions data mapping in MXF described in SMPTE 436m it costs $75 before buying I decided to google if something was discussed on forums. Even if you crop vertically to remove letterboxing (but still leave the 720 width), the SAR remains the same. ![]() ffmpeg -i input.mp4-map 0 -c copy -bsf:v hevcmetadatasampleaspectratio8/9 -aspect 4/3 output.mp4. So the task to extend our MXF writer to write captions track and extend reader to read captions track.īy captions I mean CDP (Closed Caption Data Packet) Remove closed captions from H.264 video: ffmpeg -i input.mkv -codec copy -bsf:v 'filterunitsremovetypes6' output.mkv. Last week I went deep to the Closed Captions wrapping into MXF (op1a, as02) ![]()
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