understanding the different AV1 settings in FF Works
Best Way to Transcode Camera Originals? FCP vs FF-Works vs ??
I’m not familiar with FF-works. But I can give a thumbs up for Compressor.
More on reddit.comLooking for laptop recommendations
Been cutting full time on an M1 Max mbp since Nov and it is fantastic. Very quick machine.
More on reddit.comList of macOS apps for m1 / Apple silicon
Videos
Hi, using FF Works, GUI for FFMPeg on Mac.
Having been trying out AV1 movie compression and am impressed with compression rate (using SVT-AV1) compared to the HEVC I was used working with.
But I'd like to understand the three different settings available for AV1 conversions :
-
Quality Mode
-
Constant quality factor mode (CRF 20 as baseline)
-
Bitrate mode
Basically I'm converting 1920x1080 H264 recordings.
In quality mode, it doesn't matter how high i put the quality (50-100%), I'm always getting the same output size. Why ?
Upping 2. even a bit (from 20 to 23) I'm getting about a 20% increase in size but no noticeable quality difference.
In bitrate mode, going from standard high quality (199906.56 Kb/s) to very high quality (29859,84) gives me an error.
Can anyone help me wrapping my head around this ?
I've used FCP to transcode to ProRes 4:2:2 (right click a clip > transcode.)
The problems that I've transcoded the SAME clip using FF-Works -- also to ProRes 4:2:2 -- and while it's considerably faster, the resulting file is huge compare with FCP's version. MediaInfo tells me the video is coming in at 463 Mb/s, more than twice the bitrate of the FCP transcode. Note that I'm using the default 'ProRes standard' preset in FF-Works, and didn't alter any settings.
Any idea of why this might be the case?
BTW: video is 1080p/59.94fps. So yeah, that bitrate from FF-Works seems like serious overkill.
At this point, I'm tempted to stick with FCP (or get Compressor.) Files are smaller and, well, it's Apple.
I’m not familiar with FF-works. But I can give a thumbs up for Compressor.
The most likely explanation is that FF-Works is applying less compression to the frame. ProRes uses a scalar discrete cosine transformation on each frame of video. This is not dissimilar to how JPEGs are compressed and like JPEGs, the amount of compression is adjustable.
Having said that, I would consider that 463Mb/sec is a tad excessive for 1080p/59.94. I've just looked up some material shot 1080p/25 which used ProRes 4444 which comes in at 275Mb/sec. FF-Works does have a variety of presets for bitrate as well as the ability to manually dial one in, although curiously doesn't apparently seem to distinguish between 422 and 4444.