filter line using only one core (need frame multithreading)

[mike]

Hello,

I am using ffmpeg version N-56143-gd1a1656, when i set threads 8 and trying reencode like : hi-res source -> filter (postprocesor,scale,unsharp,gradfun) -> output , then i see only one core is busy.
Adding frame multi-threading for whole filter line would be welcome, as that would allow filters that can't generally use slice threading to benefit of multiple cores like in my case

[Ck-NoSFeRaTU]

Yeah, it is a big problem, especially when one ffmpeg process doing multistep filter processing and many outputs at once, one core is not near enough... There were some patches in maillist about multithread support to filters, but they aren't compatible anymore:
​http://ffmpeg.org/pipermail/ffmpeg-devel/2012-June/126188.html
​http://ffmpeg.org/pipermail/ffmpeg-devel/2012-June/126189.html
​http://ffmpeg.org/pipermail/ffmpeg-devel/2012-June/126238.html

[mike]

i do not know if it is a good implementation , cause i am not a programist and i do not compile ffmpeg self, so can't check if it would help me , if it is not in official version it means it is not complete

I was thought of something like when call filter if it can operate on single frame it will buffor x frames , and run x threads each filtering one frame, so like:

source -> buffor -> filter1 -> filter2 -> buffor -> output
                 -> filter1 -> filter2 ->
                 -> filter1 -> filter2 ->

but not every filter can operate on sigle frame so maybe better would be :

source -> buffor -> filter1 -> buffor -> filter2 -> buffor -> filter3 -> buffor -> output
                 -> filter1 ->                             -> filter3 ->