Comment 3 for bug 550524

x264 output:

y4m [info]: 704x576p 128:117 @ 60/1 fps (cfr)
x264 [info]: using SAR=128/117
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
x264 [info]: profile High, level 3.1

mencoder output:

MEncoder UNKNOWN-4.4.3 (C) 2000-2009 MPlayer Team
success: format: 0 data: 0x0 - 0x15c0ce36
YUV4MPEG2 file format detected.
YUV4MPEG2 Video stream 0 size: display: 704x576, codec: 704x576
VIDEO: [YV12] 704x576 12bpp 60.000 fps 0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:12 fourcc:0x32315659 size:704x576 fps:60.000 ftime:=0.0167
** MUXER_LAVF *****************************************************************
REMEMBER: MEncoder's libavformat muxing is presently broken and can generate
INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
OK, exit.
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
==========================================================================
Opening video decoder: [raw] RAW Uncompressed Video
VDec: vo config request - 704 x 576 (preferred colorspace: Planar YV12)
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.34:1 - prescaling to correct movie aspect.
[swscaler @ 0x9229110]using unscaled yuv420p -> yuv420p special converter
x264 [info]: using SAR=35/32
x264 [info]: using cpu capabilities: none!
x264 [info]: profile High, level 3.1
Selected video codec: [rawyv12] vfm: raw (RAW YV12)

I think it something with libx264 or the implementation of it ...