It basically achieves quality parity with h264 at the same bitrate Depending on the source (a camera video, for example, it's often poorly encoded and can be compressed much further). It's relatively fast with gains of 30-50%. The most practical method of transcoding is to cpu encode with x265. And then I advise that you use either batch ffmpeg transcoder, if you plan to run this in a single computer running windows, or tdarr for being able to use multiple computers at the same time. I advise you read well on what you want to do. My latest encoding script was written in bash and uses vp9 2-pass encode, for them 9mb discord limits 🆒 OP could just find a crf value for his lower encodes and it's probably fine for all of them. Though I could not find much, might just be an old rule of thumb. Therefore, lower resolutions require lower CRF values, while for higher resolutions you can get away with higher CRF values. In other words, you can use a higher crf value (try 20-23) for the same relative quality as with a lower resolution. That said, most find that the higher the resolution, the greater the perceptual quality for a given ratefactor. You'd still have to do some hand holding because of a large amount of different files.Īt high resolutions the aritfacts are relatively small scale compared to the whole picture so you can get away with a higher CRF before they become noticable. Outside of that, it's pretty trivial to accomplish in bulk, a python script or a shell of your choice and you could semi-automate it without concern. Unless im throwing something on discord, in which case who cares. I never even go above 20, because at that point thing start to look as high quality as a youtube video. I aim for ~CRF 14-15 when I compress my videos, to actually retain any quality to speak of. So a low quality input can indeed become larger.Įither way CRF 28 is ludicrously high compression in libx265. The downside is that it can attempt to retain information on something that is already poor. It will up and down the bitrate as is required on it's own.
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Also the reason why CRF is superior, because irrelevant of input the output is a constant level of retained quality by which the encoder is given rather free hands in achieving. Since each encoders CRF scale is different. It is as the name suggests, a constant for said encoder. Basically, a measure of how much to keep or throw away from any given block.
CRF, Constant Rate Factor, is a setting to maintain a constant quantization parameter. Just make sure to tag the post with the flair and give a little background info/context. On Fridays we'll allow posts that don't normally fit in the usual data-hoarding theme, including posts that would usually be removed by rule 4: “No memes or 'look at this '” We are not your personal archival army.No unapproved sale threads, advertisement posts, or giveaways.No memes or 'look at this old storage medium/ connection speed/purchase' (except on Free Post Fridays).Search the Internet, this subreddit and our wiki before posting.
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