rain@acnote:~/to_net$ mencoder -ss 0:0:0 -endpos 0:1:0 -ovc copy -oac copy Столкновение\ с\ бездной.HDTV.x264.720p.mkv -o file.mkv
MPlayer SVN-r31918 (C) 2000-2010 MPlayer Team

WARNING: OUTPUT FILE FORMAT IS _AVI_. See -of help.
success: format: 0  data: 0x0 - 0xcfc4c81
libavformat file format detected.
[matroska,webm @ 0x941be70] Estimating duration from bitrate, this may be inaccurate
[lavf] stream 0: video (h264), -vid 0, Deep Impact
[lavf] stream 1: audio (ac3), -aid 0, -alang rus, Russian
VIDEO:  [H264]  1280x544  0bpp  24.000 fps    0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:44  fourcc:0x34363248  size:1280x544  fps:24.000  ftime:=0.0417
videocodec: framecopy (1280x544 0bpp fourcc=34363248)
audiocodec: framecopy (format=2000 chans=6 rate=48000 bits=0 B/s=56000 sample-0)
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Pos:  60.0s   1441f ( 0%)  0.00fps Trem:   1min 4296mb  A-V:-0.018 [2786:448]
Writing index...
Writing header...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.

Video stream: 2786.054 kbit/s  (348256 B/s)  size: 20909918 bytes  60.042 secs  1441 frames

Audio stream:  448.000 kbit/s  (56000 B/s)  size: 3360000 bytes  60.000 secs