ffmpeg for 64 bit windows

[Cazz]

Hi
I have a version of ffmpeg for windows but what I have see it only use 50% of my CPU so I can guess that only have 32 bit and not 64.

Where can I download a 64 bit ffmpeg for windows?

[dannyboy48888]

50 percent has nothing to do with that. yes ffdshow is a single threaded app, but even in 32 or 64 bit windows it will still show as 50% on a dual proc machine. the main diffrence beetwen the 32 and 64 versions (if any) would be how it does memory adressing. and the vfw filter to make it 'work' with other 64 bit filters. if you do manage to get a 64 bit version it will still show 50% cpu usage just be slightly quicker because it is only using one proc. go into the settings of ffdshow and enable 2 threads and you will see about a 2x diffrence mainly in x264 encoding. others varies depending if the encoder is able to do multiple threads (believe theora can)

hope this helps

[dannyboy48888]

oh yeah only time a 64 bit app will be 'faster' is if a 32 bit app had a routine that required 2 clock cycles to do a claculation. in 64 bit mode the number would fit in the register and would be able to be processed in i cycle. useful for code cracking, math , etc. music and video FOR NOW dont have any 'numbers' the wont fit in a 32 bit register so the speed diffrence is neglible in that area. but math,etc it is about twice as fast.

[Cazz]

Hmm ok
I have a computer that have dualcore and I was thinking about run windows XP (32 bit) or Ubuntu (32 or 64) and I was thinking what I can do so it use both of the proc.
I was just hopping that I can use ffmpeg faster when I convert my movie and I dont have to wait so long

[jagabo]

You can't force a single threaded app to use two cores. But some of the encoders in ffdshow support multiple threads. Xvid and h.264, for example. Go to the encoder configuration and set the number of threads in the Generic section.

[Cazz]

this maybe sound stupid but what have ffdshow with ffmpeg??
I mean for a example ffmpeg is on linux but ffdshow is not?

[jagabo]

Oops, sorry! My brain slipped.

[Cazz]

oh that is ok, I was thinking that I have miss something when you all start to talk about ffdshow

[45tripp]

ffmpeg switch is:

 -threads

try -threads 2 or whatever
how effective multithreading is depends on the codec

[Cazz]

Thanks it work nice

[dannyboy48888]

ffmpeg is the common name for the code that is used in linux and windows. ffmpeg compiled for win32/64 with with a vfw interface is reffered to as ffdshow. you you want 'ffmpeg' functionaltiy without the vfw interface look up apps that use mplayer as backend as it decoding/encoding routines are based off of ffmpeg or in linux libav and yes -threads is used for the cli not vfw. in vfw it is enabled in the encoder settings per codec