Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

 

Go Back   Doom9's Forum > Video Encoding > High Efficiency Video Coding (HEVC)

Reply
 
Thread Tools Search this Thread Display Modes
Old 25th December 2018, 09:01   #1  |  Link
nghiabeo20
Registered User
 
Join Date: Jun 2013
Posts: 32
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.
nghiabeo20 is offline   Reply With Quote
Old 25th December 2018, 10:35   #2  |  Link
tuanden0
Registered User
 
Join Date: Oct 2016
Posts: 111
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.
tuanden0 is offline   Reply With Quote
Old 25th December 2018, 11:49   #3  |  Link
nghiabeo20
Registered User
 
Join Date: Jun 2013
Posts: 32
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.
nghiabeo20 is offline   Reply With Quote
Old 26th December 2018, 14:25   #4  |  Link
Selur
Registered User
 
Selur's Avatar
 
Join Date: Oct 2001
Location: Germany
Posts: 7,259
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
__________________
Hybrid here in the forum, homepage
Selur is offline   Reply With Quote
Reply

Tags
concatenate, ffmpeg

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 20:33.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.