Error closing file pipe:: Broken pipe Conversion failed!

When I use the Q option to quit recording I get the above message. I then notice there's some challenges seeking with vlc at the end of the file. This is using mkv and ffv1.

When using ctrl-c to end recording I haven't noticed the message but I have discovered I still get the seeking issues. I need to test again but I dont think this happened before mkv and ffv1. This is a bit worrying as it seems the closing of the file isn't happening properly and not writing the proper seek info. I'm betting there is something in mlv tools that will check it.

The video does appear to playback fine though.

Also need to try another player I guess. Could just be something with the codec still gaining proper support.