I'm editing my first film project in Blender VSE. I had big problems with replay due to my phone's camera using a strange video codec, but this answer fixed it. I've set the proxy option for all strips and generated them and since I care about replay speed and not about preview quality, the proxies are at 25% size 30% Jpeg compression.
The problem is: Blender really likes one of my strips. It's always the same and I don't know why Blender chose exactly that one, but very often during replay the editor shows that strip instead of the actual one. This may happen during a whole strip or just for a few frames scattered around the strip and is really annoying. It usually goes away by refreshing the proxy or turning off proxies for some while, but not always.
Does anyone know why this is happening and how to work around it? I sadly can't upload any examples.
I just found that in the BL_proxy folder there was not only one subfolder per strip, but one more called proxy_misc having the subsubfolder named 25 in it. That one contains all frames of the problematic strip I see all the time in single jpg pictures. I am pretty sure that it is the cause of my problem, but why is it there and what does it actually do? Are there any documentations on what files Blender generates for creating the proxies?