Stefan,

Andrea has the best suggestion as I know nothing about mkv. You might try using Settings->Transcode with a Scale of 1 for at least your editing work. This is just an uneducated guess, but as Andrea pointed out in BT #137 seeking may be the problem -- when you use Transcode with a scale of 1 CinGG adds in "keyframes (a different kind of keyframes than what you expect) which make seeking work better. This is discussed in:

https://cinelerra-gg.org/download/CinelerraGG_Manual/Transcode.html

To quote from that:

The BIGGEST gain from using this is if you have media that is not seekable , that is, you can play it from the beginning but can not move to another spot and have the audio or video play correctly. A video file with no keyframes makes seeking next to impossible, but then a Transcode generally adds these keyframes. This is particularly useful for the mkv container, which often has seek problems.

On Wed, Nov 23, 2022 at 3:07 PM Andrea paz via Cin <cin@lists.cinelerra-gg.org> wrote:

Yes, try. I use mov or mxf.
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