If ffmpeg isn’t available, try searching “H264” in your package manager. For all options, read the manual “man ffmpeg” or check the Linux Die website which is a manpage archive. If it doesn’t, you _may_ have to manually tweak it with some parameters. It _should_ also add blanks if missing or drop if too many. Ffmpeg autodetects the correct settings, including framerate (should be 23.9x IIRC) and will write the metadata correctly normally. The “file” (extension)is the container you want. Install ffmpeg if not already present, then run “ffmpeg source.file new.file” from the CLI (“command line”) where “sourc.file” is video name and “new.file” is the output (new name) for the re-encode. Using ffmpeg (usually installed by default on Linux-based systems, but available on most), a 90min movie takes ~10min on a cheap 8th gen intel chip. Try reencoding as most apps automatically correct stuff ups like these on default settings. You may be missing some frames or just have an AV sync error. Many players derive “how fast it plays” from this, irrespective of actual framerate. You’ll have to visit this advanced preference again to reset it back to 1.00x. You will have to stop and play a file again or you can restart your player to ensure that this new settings is in effect. This new value will be your default playback speed. Under Playback control you will find Playback speed. Input a value up to two decimal places.
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