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I made a holiday video using capcut and uploaded it to my synology server to watch it via plex in various devices. About 40seconds in it starts buferring without good reason. This happens in both windows and Android versions of Plex but not in the web version! The video plays fine in VLC or in the synology media player. The only solution is to manually convert the video via plex. If I export the video from capcut with different settings (bitrate/resolution etc.) the problem persists.
An experiment:
Take the file out of capcut and drag it directly into mkvtoolnix.
“start muxing”
Now take the resulting MKV file and put it onto your Plex server.
If that file plays alright, then capcut is not applying interleaving to its output files. (Which is a major mess up, IMHO)
hello friend and thanks for the quick reply! Indeed I followed your recommendation and turned the capcut mp4 file into mkv and now it plays fine on plex, thanks! I do not know of course if interleaving was the problem or something else…
However, what I find the most interesting is that the original mp4 file plays without issue on plex web, but not on windows or android client… This suggests something going on with plex windows/android clients too!
which rewrites the container’s structure and forces interleaving every 500ms. That preserved the mp4 format and fixed the issue. Claude concluded that “the core issue appears to be how CapCut structured the MP4 container, specifically around interleaving and streaming optimization.”
In any case I am happy with the outcome. Thanks for the help.
That aligns with my conclusions above. It doesn’t really matter whether you preserve the mp4 container or change it into mkv.
The quality is retained in both cases because all that is done is a remuxing, not a recoding/transcoding.
