[x264-devel] Problem with frame packing mode 5 ..

[Paul arola]

I've been attempting to build some frame interleaved 1080p60 3D
content for a fun proof of concept at work. Starting with a short 5
min sequence from Avatar, I extracted the left and right views, I then
use Interframe (or mvtools) to frame interpolated to 29.97fps, and
then finally I feed into x264.

My AVS script (same thing occurs, even when I don't use avisynth as
input though)

setmtmode(2,2)
left=ffvideosource("Avatar_Reference_Clip_1080p24_Left_View.ts").interframe(newnum=30000,newden=1001,tuning="film",cores=4)
right=ffvideosource("Avatar_Reference_Clip_1080p24_Right_View.ts").interframe(newnum=30000,newden=1001,tuning="film",cores=4)
return interleave(left,right)

My x264 command line. I usually use Taro's x264 builds (due to their
lovely ffmpeg/libav input), but this was reproduced with the latest
32bit builds from x264.nl:

x264 --preset fast --ref 4 --nal-hrd vbr --bitrate 15360 --vbv-maxrate
15360 --vbv-bufsize 15360 --profile high --level 4.2 --keyint 60
--stats test.log --fps 60000/1001 --frame-packing 5 --pass 1 --slices
4 -o test.264 frame_interleaved_1080p60.avs

x264 --preset fast --ref 4 --nal-hrd vbr --bitrate 15360 --vbv-maxrate
15360 --vbv-bufsize 15360 --profile high --level 4.2 --keyint 60
--stats test.log --fps 60000/1001 --frame-packing 5 --pass 2 --slices
4 -o test.264 frame_interleaved_1080p60.avs

When I watch the resulting encode their are significant motion
problems in each view, like odd stuttering. I initially thought this
was a problem with my PS3's playback, but I can reproduce this with
Stereoscopic player on my PC (using monoscopic mode to look at each
view individually). However, if I modify the command line to remove
'--frame-packing 5' the resulting encode works perfectly, and motion
in each view is what I'd expect.

I also found another related problem, I usually encode with preset
veryslow and when using '--frame-packing 5' with veryslow, I always
get crashes on the 2nd pass:

encoded 17868 frames, 5.91 fps, 15159.47 kb/s
avs [info]: 1920x1080p 1:1 @ 60000/1001 fps (cfr)
x264 [warning]: --ssim used with psy on: results will be invalid!
x264 [warning]: --tune ssim should be used if attempting to benchmark ssim!
x264 [info]: using SAR=1/1
x264 [info]: using cpu capabilities: MMX2 SSE2Fast FastShuffle SSEMisalign LZCNT

x264 [info]: profile High, level 4.2
Assertion failed! frames, 3.46 fps, 15080.49 kb/s, eta 1:19:05

Program: C:\VidStuff\Apps\x264\x264.exe
File: encoder/slicetype.c, Line 1810

Expression: cost >= 0

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.




I'm assuming this is a bug in x264, so hopefully someone can provide a
solution =).

Here are the source files I'm using:

Left View (~700MB)-> http://www.mediafire.com/?a5vlsw6u5ffwzk4
Right View (~700MB) -> http://www.mediafire.com/?r67lt0kvh2gxrqc

Here are the encodes I did:

Encode (with frame packing 5 and motion problems) ->
http://www.mediafire.com/?scj7wd3y7ki6nta
Encode (without frame packing 5, and perfect motion) ->
http://www.mediafire.com/?6clqrqhb3hc5a2b

Thanks in advance,

-paul