• SLR

  • 120 Mbps constant bitrate v cca 30Mbps variable bitrate

Let's have a meaningful discussion on the resolution to bitrate ratio.

Check the following files with DeoVR or SLR app. The bigger file is the one we get from the camera. The smaller one is created with FFMPEG for streaming with "always best quality" setup for variable bitrate. Make sure to attach screenshots or try to be specific.

Check https://www.sexlikereal.com/blog/82-vr-video-bitrate-explained for reference. It's a bit outdated. Maybe it's the time to revisit it.

https://insights.sexlikereal.com/videos/bitrate_test/Test1_mkx200_cbr.mp4
https://insights.sexlikereal.com/videos/bitrate_test/Test1_mkx200_vbr.mp4

https://insights.sexlikereal.com/videos/bitrate_test/Test2_mkx200_cbr.mp4
https://insights.sexlikereal.com/videos/bitrate_test/Test2_mkx200_vbr.mp4

https://insights.sexlikereal.com/videos/bitrate_test/Test3_mkx200_cbr.mp4
https://insights.sexlikereal.com/videos/bitrate_test/Test3_mkx200_vbr.mp4

a month later

Not sure how I reached this thread, but got curious.

I agree VBR is the way to go.

Just curious, what's the ffmpeg command line you are using for 264 and 265 ?
It probably changes from file to file, but what are the common flags you use?
Single pass? multiple pass?

I'm planning to re-encode some non porn stuff, I've followed official ffmpeg documentation but can't get a result I like, so wondering...

Thanks,

    ExtraXX FFMPEG can have very advanced options, for a more personal use, I advise you to use handbrake or megui which will give you a very good final file with a minimum of configuration (some options to know, but nothing very complicated).

      ffmpeg cli has presets that set most of the options for you. slr uses single pass crf on slow preset with a couple of additional options.

      Thanks, i was interested in those other flags you mentioned, more if relevant to the need for streaming.

      I need to encode hundreds of files, but I've not gotten the results I wanted for vp9 and hvec, so thought it didn't hurt to ask.

      Will try other encoders for hvec.

      Thanks,

      ExtraXX

      I'm planning to re-encode some non porn stuff, I've followed official ffmpeg documentation but can't get a result I like, so wondering...

      Why would you want to do this? Reencoding in any lossy format will always lead to a reduction in quality, it may be insignificantly small but it is always there and it never can be better.

      The only reason I can think of is to reduce the needed storage capacity. But why? Storage is cheap enough to just buy enough storage, and any meaningful reduction in file size is also likely to reduce quality.

          ibins By pushing the options, with HEVC for example, let's take for example a UHD bluray whose film is 60GB, it is very largely possible to make it fit on 15GB with a quality loss lower than 5% (thus an insignificant loss).
          Imagine to have 100 movies like that, it would require 6Tb in untouched against 1,5Tb in compressed, which allows either to have more files on the HDD, or to buy a smaller HDD and therefore less money.
          Yes, HDD's are cheaper now (although, for more than a year, prices have gone up, even if they tend to come back to normal, but not quite yet).
          Personally, I'm on a nas 7 bay with 7 HDD of 14Tb, it's far from being as low priced as you say.

          Anyway, there are pros and cons on both sides, but personally, depending on the files, I do not see why he should refrain from re-encoding them.

          The only thing after that is to have a good cpu and time to do all this in good condition.

          Translated with www.DeepL.com/Translator (free version)