x264 video questions.

[bananacreamandpeca]

*I have encoded a video with megui (x264 default-profile/constant quantizer 18)
The result video takes like forever to start playing (harddisk going crazy before the video even shows!). Why is that?

*Is "constant quantizer" and "constant quality" (MEGUI) and
"final quantizer rate" (in x264-log) all the same thing?

I need to transfer source-audio from xvid video to
re-encoded 264-mkv. How must I do this?
Megui seems to take forever for such a simple task.
Source audio is VBR-MP3 and needs to be muxed in mkv.
I seem to have offset problems. anyone can tel me how to
mux with the correct offset?
It's a B**** to figure out the right offset.

[Blue_MiSfit]

Did you encode to a raw h.264 stream? If so, that would explain the huge delay in opening the file. Mux your file to an MKV and it should play better.

[bananacreamandpeca]

No, the output is MKV.
Or can raw video be somehow accidentaly put in an MKV container?

Here is part of the log:

Starting job job1 at 5:38:53
encoder commandline:
--qp 18 --analyse p8x8,b8x8,i4x4 --thread-input --progress --no-psnr --output "f:\dda re-edits496x272bilin.mkv" "C:\dda re-edits496x272bilin.avs"
successfully started encoding
Processing ended at 7:18:52
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Log for job job1

avis [info]: 496x272 @ 23.98 fps (136562 frames)
x264 [info]: using cpu capabilities MMX MMXEXT SSE 3DNow!
x264 [info]: slice I:548 Avg QP:15.00 size: 6820
x264 [info]: slice P:136014 Avg QP:18.00 size: 1355
x264 [info]: mb I I16..4: 71.6% 0.0% 28.4%
x264 [info]: mb P I16..4: 8.1% 0.0% 0.4% P16..4: 15.7% 9.5% 3.3% 0.0% 0.0% skip:63.0%
x264 [info]: SSIM Mean Y:0.9942056
x264 [info]: kb/s:264.1

encoded 136562 frames, 22.77 fps, 264.13 kb/s
This is a CQ job so there's no desired bitrate. Obtained video bitrate: 266 kbit/s
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Job completed successfully and deletion of intermediate files is activated