MKV files from these sources are often highly compressed. If your file size is significantly smaller than what was listed on the site (e.g., 200MB instead of 1.2GB), the download is incomplete.
: Interrupted internet connections can result in "truncated" files that are missing the final bits of data required for playback. vegamovies nl mkv fix
If the file is heavily corrupted, you may need a dedicated tool. MKV files from these sources are often highly compressed
(repair container without re-encoding)
: In the same Input / Codecs menu, look for "File caching (ms)" and increase it to 1000 or higher to prevent stuttering. 200MB instead of 1.2GB)