I do a lot of Artemis - Medium quality on 1080p content.
In v2.6.4, I usually run all my files through CRT (Constant Rate Factor) = 10, what Bitrate should I set it in version 3.0.1 for Bitrate (MB/s)? I want to ensure I am getting the equivalent quality?
I think it is named CRF = constant rate factor. It uses a bitrate that goes up and down to attempt to deliver the same quality in all parts of a movie. Dependend on the video footage the average bitrate can vary a lot.
Bitrate depends on many things including the fps and encoder. I checked one of my 1080p 30 fps encoded H264 that were done at CRF 17 and that was 28 Mb/s. I know BD discs usually come in around 20-25 Mb/s but they are also usually only 24fps. If you want to check your old files to see the bitrate they were output on, then use a tool called media info which will give you the bitrate and fps as well as the codecs used.
I would tend to agree CRF 10 does seem a bit extreme. Personally CRF 17 gave me equivalent to a good BD bitrate. I have seen 1080p at 12Mb/s and it is generally a “good” picture however 20Mb/s is superior in fast action packed scenes where a lot is going on so it depends on what you are encoding. It’s all down to personal choice. Higher bitrates give better picture quality, if you want smaller file size and don’t care so much about picture quality then go with lower bitrates. Obviously now we have the option of H265 you could reduce the bitrate by as much as 60% and still get an equivalent picture quality to the H264. It’s not unusual for 4k BD to be in the region of 50-70Mb/s and that’s using the HEVC 265 codec.
Yep totally agree. It’s far better to have a variable bitrate based on picture quality then setting a bitrate that may be way too high for some scenes and not enough for others.
VEAI 3.0.x does not appear to have a CRF setting. (Which is disappointing.) However, If you want to control the lossiness of your video while working on it use the ProRes 422 HQ option. It will output ginormous files, which can be reprocessed without much image degradation. After all your enhancement work is done you can then do a final export to whatever compressed format you want and specify a large or small bitrate.
My preference is to use a higher bitrate to avoid compression artifacts, but depending on how the final video image is used may determine your choices.