MKV file suffers from corruption at certain timecode

Hello!

Long time vrecord user, but I have noticed a problem where some captures feature a point in the video where it will freeze every time it is played back. I usually notice this when converting the capture MKV to another format, the conversion will break at the same time code.

Vrecord doesn't seem to report any errors when this happens, which is why I'm wondering where the problem might come from. It doesn't tell me about a dropped frame. Does this sound like a problem with my thunderbolt cable, or maybe my mac is wearing out?

I have been able to "cut" out the bad second and put the video back together successfully.

Attached are the two log files. Any thoughts or tests I could do would be appreciated!

[shonenbook_11_11_capture_options.log](https://github.com/amiaopensource/vrecord/files/10034597/shonenbook_11_11_capture_options.log)
[shonenbook_11_11_ffmpeg_decklink_input.log](https://github.com/amiaopensource/vrecord/files/10034598/shonenbook_11_11_ffmpeg_decklink_input.log)