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Old 24th September 2005, 17:37   #1  |  Link
MeteorRain
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An easy way to prevent borked x264-in-mp4 file

The problem has been mentioned in thread x264 mp4 output borked (rev 295)

I just found an easy way to prevent the extremely large dwRate and dwScale:
at the bottom of your avs script, simply add assumefps(2997,125) if your clip is @ 23.976fps (in fact, you can also use 24000,1001 to get @ ~23.976024)

EDIT:

If you are going to fix the fps, please use one of the following:
Code:
assumefps(30000,1001) #29.970
assumefps(24000,1001) #23.976
The original code above will produce non-standard fps rate and thus is not recommended. Use the new code instead.

(Although it has been 8 years since I wrote this post, I still want to correct this error because this post is linked from the x264 FAQ post.)

Last edited by MeteorRain; 5th August 2013 at 19:49. Reason: Fix an error on assumefps code
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Old 24th September 2005, 18:52   #2  |  Link
Sirber
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Quote:
Originally Posted by MeteorRain
BTW, simply write assumefps(23.976) won't give you any good things...
So it's AVISynth that provide extremely large dwRate and dwScale?
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Old 25th September 2005, 00:21   #3  |  Link
MeteorRain
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Quote:
Originally Posted by Sirber
So it's AVISynth that provide extremely large dwRate and dwScale?
avisynth reads the information from avifile =. =
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Old 25th September 2005, 04:03   #4  |  Link
bugsan
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it works !!!
assumefps(2997,100) # for 29.97 contents

i was using assumefps(29.97), it was wrong... ^^
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Old 25th September 2005, 13:47   #5  |  Link
Sharktooth
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rev300 should fix the FPS issue.
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Old 25th September 2005, 14:44   #6  |  Link
bugsan
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damn... -1670.82 kb/s -_-
and the line above there is "kb/s:345.6"

Code:
D:\GITS>"c:\program files\x264\x264.exe" --progress --pass 1 --stats "\x264.stat
s" --subme 3 --ref 8 --threads 1 --filter 0:0 --keyint 250 --min-keyint 25 --sce
necut 40 --qpmin 10 --qpmax 51 --qpstep 4 --direct temporal --me hex --merange 1
6 --bframes 2 --weightb --b-bias 0 --ipratio 1.40 --pbratio 1.30 --qcomp 0.60 --
analyse p8x8,i8x8,i4x4 --8x8dct -o "D:\GITS\gits_movie.mp4" "D:\GITS\gits_movie.
avs"
avis [info]: 848x464 @ 29.97 fps (35584 frames)
x264 [info]: using cpu capabilities MMX MMXEXT SSE 3DNow!
mp4 [info]: initial delay 100 (scale 2997)
x264 [info]: slice I:330  Avg QP:23.00 Avg size: 21701 PSNR Mean Y:44.63 U:48.66
 V:49.44 Avg:45.61 Global:45.17
x264 [info]: slice P:14663 Avg QP:26.00 Avg size:  2472 PSNR Mean Y:42.73 U:47.3
6 V:48.19 Avg:43.81 Global:43.47
x264 [info]: slice B:20591 Avg QP:28.00 Avg size:   383 PSNR Mean Y:42.79 U:47.5
0 V:48.33 Avg:43.89 Global:43.55
x264 [info]: slice I   Avg I4x4:33.4%  I8x8:31.1%  I16x16:35.5%
x264 [info]: slice P   Avg I4x4:1.9%  I8x8:2.3%  I16x16:3.2%  P:12.3%  P8x8:1.0%
  PSKIP:79.3%
x264 [info]: slice B   Avg I4x4:0.2%  I8x8:0.3%  I16x16:0.3%  P:8.0%  B:0.5%  B8
x8:0.0%  DIRECT:0.3%  BSKIP:90.4%
x264 [info]: 8x8 transform  intra:32.1%  inter:35.0%
x264 [info]: PSNR Mean Y:42.78 U:47.46 V:48.28 Avg:43.87 Global:43.53 kb/s:345.6


encoded 35584 frames, 9.04 fps, -1670.82 kb/s
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Old 25th September 2005, 15:11   #7  |  Link
Sirber
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Good work guys on that bug
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Old 25th September 2005, 21:51   #8  |  Link
akupenguin
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Quote:
Originally Posted by Sharktooth
rev300 should fix the FPS issue.
How so? If the bug is in GPAC, it wasn't fixed in 0.4x, so updating didn't help. and 295->300 didn't change anything else remotely related.
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Old 25th September 2005, 22:29   #9  |  Link
Doom9
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adding assumefps(3.142) to a perfectly fine script also creates corrupt mp4 output with revision 300..
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Old 26th September 2005, 12:51   #10  |  Link
Sharktooth
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Quote:
Originally Posted by akupenguin
How so? If the bug is in GPAC, it wasn't fixed in 0.4x, so updating didn't help. and 295->300 didn't change anything else remotely related.
uhm... i didnt check the code changes but jarod said you fixed the gpac patch before committing it to the SVN, so i assumed you did...
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Old 26th September 2005, 17:15   #11  |  Link
akupenguin
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I fixed a crash in the version you posted.
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Old 26th September 2005, 17:31   #12  |  Link
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Quote:
Originally Posted by akupenguin
I fixed a crash in the version you posted.
revision 299:
MP4 output: update to GPAC 0.4 API.
patch mostly by Robert Swain.

Just to be clear ( and free of blame )
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Old 26th September 2005, 18:05   #13  |  Link
Sharktooth
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ok... i thought jarod was referring to the encoder crash due to the overflow generated by the dwscale...
just a misunderstanding:P
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Old 28th September 2005, 12:42   #14  |  Link
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Avisynth Filter

Hello everyone!

I wrote a little Avisynth Filter that takes care of the too big scale and rate problem.

The filter's function name is "NiceFPS(int x)". x is the maximum new scale (by default 5000) that the function is allowed to use for approximating the original FPS. It chooses the new rate and scale in a way that the resulting rate/scale is as close (or equal) to the original FPS as possible. Do not set x too high - the default value is good enough and the new FPS is most of the time 1/1.000.000 or less away from the original fps. So you WON'T notice any sync issues.

example AVS-Script:
-----------------------
loadplugin("nicefps.dll")
avisource("movie.avi")
...
nicefps()
-----------------------

I hope you'll find this little filter useful. Feedback is welcome.

Wishes, Chris
Attached Files
File Type: zip NiceFPS.zip (29.1 KB, 770 views)
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Last edited by eMotionEstimation; 29th September 2005 at 18:36.
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Old 28th September 2005, 12:45   #15  |  Link
Sharktooth
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n1
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Old 28th September 2005, 12:51   #16  |  Link
Sirber
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Gonna add it to my softs once it's approved. Nice work!
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Old 28th September 2005, 13:05   #17  |  Link
bob0r
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@eMotionEstimation

Can you email me the file to eMotionEstimation [at] x264 .nl ?
I'll host it online.

Then lets encode some 29.97 x264 .mp4!
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Old 28th September 2005, 13:22   #18  |  Link
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@bob0r

You got mail, hopefully! damn yahoo...
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Last edited by eMotionEstimation; 28th September 2005 at 15:55.
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Old 28th September 2005, 16:20   #19  |  Link
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Quote:
Originally Posted by eMotionEstimation
@bob0r

You got mail, hopefully! damn yahoo...


http://mirror05.x264.nl/eMotionEstimation/nicefps.zip
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Old 28th September 2005, 16:21   #20  |  Link
eMotionEstimation
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edit: Too slow...I'm getting old.
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Last edited by eMotionEstimation; 29th September 2005 at 07:38.
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