I am trying to encode a 4 episode Blu-Ray of mine and I am noticing something I have not come across before.
3 of the 4 episodes encode just fine and at the bitrate I chose in the settings. They come out the exact file size the bitrate calculator said they would as usual. The 4th episode however, is always encoding at a lower bitrate and the file size is not what I specified it to come out at. It simply refuses to come out as the other episodes do.
Mediainfo is showing the data like this
7386Kbps (9563 Kbps)
The other 3 episode simply show up as 9563Kbps and are the file size they are supposed to be. I have not come across a second number that is in (parenthesis) before.
I would not mind it if the file size was not almost 300MB less in size than it should be. I am getting the impression that most of the video is in the 7000's instead of where I set it at.
Why is this one episode giving me this kind of problem? I been using these encoder settings for years and have never had this happen to an encode before.
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If it helps any, all 4 episodes are one long .m2ts file with 4 episodes connected together. I chose specific frames in the 4 scripts to get each one separated in the video and audio output.
The other 3 are the same encoder settings and from the same video source, so why is this one doing this? It is roughly the same exact length as the other 3 episodes, a second or two difference at most. It's also roughly the same source quality since its all in the same .m2ts file.
I am confused as to why I am having this issue and cannot get it to encode at the bitrate and file size I specified like everything else I encode.
When a video isn't "complex" enough an encoder cannot reach the requested average bitrate. Especially if you are limiting quantizers, peak bitrate, etc.
I'm not limiting anything more than I ever have before that I am aware of. I have always used these settings for 1080p material and its always encoded at the bitrate I chose just fine.
program --preset slow --pass 2 --bitrate 9563 --stats ".stats" --deblock 1:1 --qpmin 10 --qpmax 28 --vbv-maxrate 25000 --subme 7 --partitions all --trellis 2 --psy-rd 0.40:0 --no-dct-decimate --no-fast-pskip --colorprim bt709 --output "output" "input"
Would lowering the min qpmin from 10 help?
Last edited by killerteengohan; 5th Jul 2018 at 08:56.
It looks like lowering the qpmin to 8 which is allowing it to use even more more bitrate than crf 10 did the trick. I find it weird that I have never had this happen before in all the years I have been encoding. Why it decides to be picky with this one episode is beyond me.
Thanks for the bit of info I gathered from your replies.