[Asenshi] Yuru Camp - 02 [10644618].mkv

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[Asenshi] Yuru Camp - 02 [10644618].mkv

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Date Submitted

13/01/2018 04:33

Series

Yuru Camp - Episode 2 (of 12): Welcome to the Outdoor Activities Club!

Comment

#animesenshi@irc.rizon.nethttps://asenshi.moe

Article (!)

Yuru Camp – 02

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File Name (Size)	[Asenshi] Yuru Camp - 02 [10644618].mkv (258.0 MB)
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Screenshots	more »
Subtitles	All Attachments \| eng [ASS]

7 comment(s):

18/04/2018 18:15 — Anonymous

The screenshots are bugged: for some reason ffmpeg cannot decode this video unless you make it decode from the beginning. Or you can use other application, as seems only ffmpeg has this bug (of course, as a exception).

18/04/2018 18:38 * — BetaMAX

#Even a Pawn can take down a King#

~~FFmpeg-libs version? Steps to reproduce?~~
Can play this with mplayer using ffh264 (FFmpeg H.264; libs 3.3.6) starting from random position.
Saw it now after some more tries. Doesn't work, when once triggered.

20/04/2018 11:10 * — admin

Seems like all H.264 4:4:4 (10-bit?) files are failing to decode properly. Was on libav 3.3.6, upgraded to 3.4.2 now but same issue.
I recall 4:4:4 failing to decode in the past, which was fixed by using another build. Will have to look into what's going on this time.

Update: doesn't seem to be just a build problem. It seems the following command is enough to demonstrate corruption (3.4.2):
ffmpeg -y -noaccurate_seek -ss 15 -i '[Asenshi] Yuru Camp - 02 [10644618].mkv' -an -sn -dn -frames 1 output.png
My very quick mplayer test seems to have the same issue:
mplayer -ss 15 -frames 1 -vo png '[Asenshi] Yuru Camp - 02 [10644618].mkv'
Both tools throw a few errors. Testing with an extracted I-frame (extracted using ffmpeg and -vcodec copy), I get the same issue with VLC and MPV, though MPC seems to decode it fine (and is the only player I've tested which fully works with all this).

20/04/2018 14:56 * — BetaMAX

#Even a Pawn can take down a King#

It's very likely a FFmpeg regression:
https://github.com/mpv-player/mpv/issues/4559
Maybe works on mpv 0.28.x with --vd-lavc-assume-old-x264=yes. I'm currently running 0.27.2, can't test without building from source (which would be rather pointless work, as I'll get it anyway with a system upgrade, scheduled within the next weeks).

ffmpeg suggests to build against libx264 150 (nothing changed, as I understand the bug data).
https://trac.ffmpeg.org/ticket/6717

21/04/2018 07:28 — admin

Wow thanks for finding that!
So it seems to be an issue with 4:4:4 encodes done with older versions of x264.
Trying to fix this may be tricky...

21/04/2018 14:24 — BetaMAX

#Even a Pawn can take down a King#

Recognized your question about setting libavcodec options on PyAV bugtracker. Can't help with that, sadly. Let's see, if someone has a clue.

25/04/2018 00:52 — admin

Looks like a proper fix will take some time, because the option was only added very recently, requiring the latest libav, which has changed its API and not compatible with PyAV.

Ended up making a hack in libavcodec to assume old x264 builds by default. Hoping this doesn't actually break anything else.

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