matroska: Add support for muxing/demuxing ffv1
Previously only demuxing when stored via the RIFF/AVI mapping was supported.
See https://github.com/FFmpeg/FFV1/blob/master/ffv1.md#matroska-file-format
Fixes #923 (closed)
Edited by Sebastian Dröge
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Previously only demuxing when stored via the RIFF/AVI mapping was supported.
See https://github.com/FFmpeg/FFV1/blob/master/ffv1.md#matroska-file-format
Fixes #923 (closed)