Quote:
Originally Posted by r0lZ
Thanks for your kind words.
As explained by tebasuna51, when you use the CRF encoding mode, the quality doesn't vary much, but the file size can vary, due to the difficulty to compress the images of the original movie. A CGI film like an animated Pixar movie can be compressed extremely well, because the image is very clean and without artifacts. In the other hand, old movies with much noise are very difficult to compress, because each frame is different from the previous one. So, differences in file size are not unusual, and you should not worry about them.
BTW, many peoples think that a specific bitrate is important to encode correctly, and prefer to encode in 2-pass mode for that reason, but it's totally wrong. Specifying the bitrate (in ABR or even 2-pass modes) imposes a constraint that the encoder must obey, and therefore, the quality is ALWAYS less good than the encoding in CRF mode (when it gives finally approximately the same file size, of course). The ONLY interest of 2-pass mode is therefore to control precisely the size of the final MKV file. That may be important if you need to copy it on a physical media like a DVD, but you should always avoid that mode if you don't care of the final file size.
See also my previous reply, just above this one.
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Thank you very much for your helpful response (and tebasuna51).
Just one more query please. At some point during the majority of my 3D conversions there is a green flash and the 3D is thrown out of synch. It's is pretty random and can happen once or multiple times, and usually there will be another green flash and the 3D will return to normal.
Do you know why this happens? I wondered if it was something to do with checking the laptop during the conversion process?
Thank you!