[FFmpeg-devel] Official status of FFv1?

[Baptiste Coudurier]

On 03/22/2010 01:11 PM, Jason Garrett-Glaser wrote:
> Here's some benches for you, Baptiste.  Source: standard foreman CIF.
>
> $ ffmpeg -i videos/foreman_cif.y4m -vcodec ffv1 -coder 1 output.avi
> frame=  300 fps= 48 q=0.0 Lsize=   19017kB time=10.01 bitrate=15563.4kbits/s
> ----------+ 1 Jason None 19473662 Mar 22 13:07 output.avi
>
> $ ffmpeg -i videos/foreman_cif.y4m -vcodec ffv1 -coder 0 output.avi
> frame=  300 fps= 98 q=0.0 Lsize=   19270kB time=10.01 bitrate=15770.5kbits/s
> ----------+ 1 Jason None 19732838 Mar 22 13:10 output.avi
>
> $ ./x264 videos/foreman_cif.y4m --preset veryfast --qp 0 -o test.h264
> --threads 1
> encoded 300 frames, 75.17 fps, 13583.06 kb/s
> ----------+ 1 Jason None 16995802 Mar 22 13:07 test.h264
>
> $ ./x264 videos/foreman_cif.y4m --preset veryfast --qp 0 -o test.h264
> --threads 1 --no-cabac;ls -l test.h264
> encoded 300 frames, 161.38 fps, 15550.08 kb/s
> ----------+ 1 Jason None 19457036 Mar 22 13:09 test.h264
>
> Note of course in practice you would use multiple threads with x264,
> which would put it well ahead speed-wise (since FFV1 cannot be
> frame-multithreaded in the typical way).

Well, it seems to really depend on the input file:

Input #0, yuv4mpegpipe, from 'source.y4m':
   Duration: N/A, bitrate: N/A
     Stream #0.0(und): Video: rawvideo, yuv420p, 1280x720, tbc N/A, PAR 
1:1 DAR 16:9, fps 23.976

-coder 1 -context 1:

frame=  300 fps= 24 q=0.0 Lsize=   72006kB time=12.51 
bitrate=47143.0kbits/s
video:72006kB audio:0kB global headers:0kB muxing overhead 0.000000%
ffmpeg -i source.y4m -vcodec ffv1 -coder 1 -context 1 -f rawvideo 
11.89s user 0.40s system 91% cpu 13.365 total

--  1 baptiste users  73734634 2010-03-22 13:58 coder1_context1.ffv1

Using veryfast:
x264 [info]: i16 v,h,dc,p: 82% 17%  1%  0%
x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 47% 39%  7%  1%  1%  1%  1% 
  1%  1%
x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 34% 27%  6%  5%  8%  5%  5% 
  5%  4%
x264 [info]: kb/s:53067.61

encoded 300 frames, 19.05 fps, 53067.61 kb/s

--  1 baptiste users  83001054 2010-03-22 13:57 test.h264

Using default preset:
x264 --qp 0 -o test.h264 source.y4m --threads 1

x264 [info]: Weighted P-Frames: Y:7.9%
x264 [info]: ref P L0: 55.6% 18.6% 16.4%  9.0%  0.3%
x264 [info]: kb/s:51284.57

encoded 300 frames, 5.46 fps, 51284.57 kb/s

-- 1 baptiste users 80212270 2010-03-22 14:04 test.h264

To me it is quite a big difference. Though yes, the multithreading makes 
a quite big speed difference.

-- 
Baptiste COUDURIER
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