2008-05-27, 18:42 | Link #1 | |
x264 Developer
Join Date: Feb 2008
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Encoders: don't let this be you.
This is from a recent anime encode from a group which will not be named. A number of people were stunned with the incredibly bad quality despite being an x264 encode of reasonable bitrate. Of course, it had the obvious problems: wrong aspect ratio and it was in an AVI file. But a quick look at the x264 header revealed far worse:
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Spoiler for Answers:
0-4: Brush up on your x264 documentation and learn more about the encoder you're using! 5-9: Good, you know a bit of your stuff and can spot the obvious errors. 10-14: You're an expert here; you can spot most of what's wrong with what they did. 15+: Why aren't you in #x264dev on Freenode? Last edited by Dark Shikari; 2008-05-28 at 08:51. |
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2008-05-27, 21:48 | Link #2 |
幻想郷
Join Date: Dec 2006
Location: 幻想郷
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Now, I need someone doing speed/quality test with --ref
How much using high B-frame, say 16 effect decoding? Well, even with --bframes 16 I still get low bframes : pframes without raising --b-bias. More question. Sometimes there's blocking in dark area. Even applying higher aq still doesn't help. Would use zone and allocate more bits to that area solve this problem? I tried this but the blocking still remains, or still more bits are needed? Yes, I leave the deblocking strength at default.
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2008-05-27, 22:09 | Link #3 | ||
x264 Developer
Join Date: Feb 2008
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For anime, huge numbers of refs can help a lot. Its quite surprising, actually.
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Decoding-speed wise, more B-frames probably actually speeds up decoding because it reduces the bitrate by increasing efficiency. Testing would probably be required to be absolutely sure, since it likely depends on bitrate. I would guess at really really low bitrates more B-frames might lower decoding speed a bit. More refs has minimal effect. Quote:
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2008-05-27, 22:34 | Link #4 |
Banned
Join Date: Aug 2006
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Dark Shikari, I hope you are aware that it is encoded like this on purpose. (Read: DB are Trolls, in particular, timecop) (OSHI- I name dropped!).
Dude actually knows what he's doing.. just likes to be gay to all the db-fans/fags. I fully condone this. |
2008-05-28, 07:48 | Link #9 |
Ancient Fansubber
Fansubber
Join Date: Aug 2004
Location: KS
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Whew, none of those were in my settings. Though we're guilty of using h264 for our .avi files. Makes the picture better. Though Id like to be doing it the right way.
Maybe you should inform the group about this(if you haven't already). The problem I always see here is - I don't wanna mention names, the show, etc... Nothing improves unless the people doing it wrong are told. They may not even be reading this forum. And if they don't accept your criticism with a nob and a thank-you, leave them be and sigh. A note to encoders who are experts - please try to put together a file that pilots can use for encoding. This means, coming from one pilot-type, so easy a monkey/caveman/dummy can do it. I know I'd love something like that. I know threads exist discussing it, but they get long and obtrusive. Dark sounds like he knows his stuff and I'm sure could throw something together. Heibi Central Anime |
2008-05-28, 08:14 | Link #12 | |
Hi
Fansubber
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maybe you can try meGUI. www.x264.nl it should be straightforward (assuming you're familiar with avisynth - which you should be O.o ) and use mkvmerge (or mp4box) to mux
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2008-05-28, 08:23 | Link #14 | |
Senior Member
Author
Join Date: Jul 2007
Location: Virginia Tech
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Also, Megui requires less calculations if you use Autoencode. But if you use "Enqueue", I think it requires more...
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2008-05-28, 08:38 | Link #15 | |
Senior Member
Join Date: Jan 2006
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2008-05-28, 08:41 | Link #16 | |
Ana-chan~
Join Date: May 2006
Location: Netherlands
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This has nothing to do with MeGUI; it's just the settings you use to mux avi's (and MeGUI use AviMuxGUI for that with default settings, so if you THINK for one second and read the replies for your post in that other thread, and change the default settings to output 'aegisub-compatible' avi's, there'd be no problem at all to keep one from using megui and instead use virtualdub. If you still by accident mux with OpenDML.. just remux with OpenDML disabled (again with AviMuxGUI), or do that stuff with virtualdub. |
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2008-05-28, 08:46 | Link #17 | |
Senior Member
Author
Join Date: Jul 2007
Location: Virginia Tech
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2008-05-28, 08:50 | Link #18 |
Ancient Fansubber
Fansubber
Join Date: Aug 2004
Location: KS
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For my purposes all I need to know is how to get the final encode done using the proper program to get an mp4 or mkv output.(Thus, we stop releasing shows encoded using h264 with a .avi). I can get the show timed and edited with no problem.
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Tags |
encoding, x264 |
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