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Old 25th December 2018, 09:01   #1  |  Link
nghiabeo20
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Problem with encoding video by chapter

I have a limited resource (4720HQ). Encoding a whole bluray in one try would fry my laptop. So, I decided to encode each chapter of the BD remux into one mkv, and use concat muxer of ffmpeg to join them together. However, the joined video has so many artifact that doesn't appear in the original inputs.

Here's a sample:

https://drive.google.com/open?id=1wn...3kBizKoiqBp567

The two inputs mkv don't have any weird artifact at all, but the artifact is clearly visible in the output video (for example, around the 8:02 mark). How can I eliminate these artifact? Some posts insist that I have to reencode with the --stitchable option, but I cannot find such option in x265. Is it true?

Thanks for your help!

Last edited by nghiabeo20; 25th December 2018 at 12:25.
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Old 25th December 2018, 10:35   #2  |  Link
tuanden0
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You can use mkvmerge to join (append) each chapter together without encode.
Without re-encoding => no artifacts.
Then, If you want to encode to h265, using the new output instead of encoding each chapter then join them

Last edited by tuanden0; 25th December 2018 at 10:41.
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Old 25th December 2018, 11:49   #3  |  Link
nghiabeo20
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Quote:
Originally Posted by tuanden0 View Post
You can use mkvmerge to join (append) each chapter together without encode.
Without re-encoding => no artifacts.
Then, If you want to encode to h265, using the new output instead of encoding each chapter then join them
You can check my sample, sorry it's rather large. The weird artifact doesnt come from reencoding. I use both ffmpeg and mkvmerge (which uses ffmpeg anyway) and the artifact is still there. It wasnt reencoded because both program join tee file in less than 1 minute, and the quality of the scenes without artifact is still great. Even ultrafast cant be that fast.

Last edited by nghiabeo20; 25th December 2018 at 12:23.
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Old 26th December 2018, 14:25   #4  |  Link
Selur
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Quote:
I use both ffmpeg and mkvmerge (which uses ffmpeg anyway)
a. mkvmerge doesn't use ffmpeg
b. merged 1.mkv and 2.mkv using mkvmerge played the resulting file in MPC-HC using the gpu decoder from my NVIDIA card, checked the cut point -> no artefacts
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