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[Cellar] Matroska support for closed captions?

Scott Shepherd <sbshepherd@ChurchofJesusChrist.org> Wed, 22 April 2020 13:48 UTC

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From: Scott Shepherd <sbshepherd@ChurchofJesusChrist.org>
To: "cellar@ietf.org" <cellar@ietf.org>
Thread-Topic: Matroska support for closed captions?
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Date: Wed, 22 Apr 2020 13:48:29 +0000
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Subject: [Cellar] Matroska support for closed captions?
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Hi all,


Are there any plans to expand Matroska capability to contain additional stream types such as timecode and closed captions?



We have some .MXF files (mostly JPEG2000) and are toying with the idea of migrating them to FFV1/.MKV, but currently .MKV can't contain timecode or closed caption streams. While I can't say I fully understand the need for multiple timecode streams (often there are 3 streams in the .MXF), we'd definitely be losing data where closed captions exist.



I know that .MKV can hold "attachments," but attachments don't seem like the right solution here. I also know .MKV can hold subtitles, but what we're seeing in these .MXF files is EIA-608 and EIA-708 closed captions that fail to carry over to .MKV.



Ideally, we'd use ffmpeg to transcode JPEG2000/.MXF to FFV1/.MKV and map all existing streams. Is that possible currently? If not, is it on the roadmap or can it be put on the roadmap? This is one of the main obstacles keeping us from embracing the FFV1/.MKV combination.

Scott Shepherd

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