Странное поведение mencoder'а

Пытаюсь создать фильм из последовательности png файлов:

$ mencoder mf://*.png −ovc x264\
−x264encopts partitions=all:8x8dct:me=umh:frameref=6:bframes=4:b_pyramid:\
weight_b:bime:mixed_refs:brdo:direct_pred=auto -of rawvideo -o png-264.x264
MEncoder dev-SVN-rUNKNOWN-4.1.2 (C) 2000-2007 MPlayer Team
CPU: AMD Athlon(tm) 64 Processor 3000+ (Family: 15, Model: 47, Stepping: 0)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.
success: format: 16  data: 0x0 - 0x0
MF file format detected.
[mf] search expr: *.png
[mf] number of files: 125 (1000)
[demux_mf] file type was not set! trying 'type=png'...
VIDEO:  [MPNG]  0x0  24bpp  25.000 fps    0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:16  fourcc:0x474E504D  size:0x0  fps:25.00  ftime:=0.0400

No video encoder (-ovc) selected. Select one (see -ovc help).

Exiting...
$

не пойму почему он не видит, что я ему указал -ovc :(

если попробовать поменять местами -ovc и -o, то:

$ mencoder "mf://*.png" −o png-264.x264 −ovc x264\
−x264encopts partitions=all:8x8dct:me=umh:frameref=6:bframes=4:b_pyramid:\
weight_b:bime:mixed_refs:brdo:direct_pred=auto
MEncoder dev-SVN-rUNKNOWN-4.1.2 (C) 2000-2007 MPlayer Team
CPU: AMD Athlon(tm) 64 Processor 3000+ (Family: 15, Model: 47, Stepping: 0)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.

Exiting... (No output file specified, please see the -o option.)
$

Помогите, в чем проблема?