[Request] Direct-I/O for ffmpeg output files

[Tóth F. János]

Please support Direct-I/O for ffmpeg output files.

Example use case: I have a multi-function home server which (among other things) dumps several continuous video streams to files (surveillance camera recordings). Since Linux file-systems have a shared LRU (least recently used) pagecache replacement logic, this continuous and meaningful amount of I/O tends to "wash out" potentially useful file-system (meta)data from the pagecache (since these video files are 99.9% write-only, I only ever open them on very rare occasions when I have reason to suspect they might recorded something unusual).

So, as I understand, the solution would be opening the output files in DIO (Direct-I/O) mode which is supposed to prevent keeping the file data in the pagecache (well, depending on the actual file-system driver and it's settings, it might goes through some caching still but it should be restricted to write caching and/or very limited in size for read-caching, hence still a lot better than regular buffered IO).

[Tóth F. János]

Did anybody consider this in the last 7 years?
I used google search to see if it's available now and the first result was this question (my question).