no exemplo que dei o comando estava sendo executado de um local ( /home/h4rd3r ) e o vídeo estava em ( /home/h4rd3r/Víideos/Clipes ), logo as screenshots estarão no diretório onde o comando foi executado ( /home/h4rd3r ), desenhando para ficar mais fácil:
110/3712MB 1.09 1.07 1.08 3/238 21793
[21681:21677 0:556] 11:49:41 Dom Jun 19 [h4rd3r@arch: +5] ~/Vídeos
(5:556)$ ls
Gov't Mule - Larger than Life.mp4
146/3712MB 1.07 1.06 1.07 2/236 21939
[21681:21677 0:557] 11:49:55 Dom Jun 19 [h4rd3r@arch: +5] ~/Vídeos
(5:557)$ mplayer -vf screenshot Gov\'t\ Mule\ -\ Larger\ than\ Life.mp4
MPlayer SVN-r33159-4.5.2 (C) 2000-2011 MPlayer Team
162 audio & 359 video codecs
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing Gov't Mule - Larger than Life.mp4.
libavformat file format detected.
[lavf] stream 0: audio (aac), -aid 0, -alang und
[lavf] stream 1: video (h264), -vid 0
VIDEO: [H264] 320x240 24bpp 29.970 fps 279.6 kbps (34.1 kbyte/s)
Clip info:
major_brand: mp42
minor_version: 0
compatible_brands: isomavc1mp42
creation_time: 2007-10-26 03:21:32
Load subtitles in ./
Failed to open VDPAU backend libvdpau_nvidia.so: cannot open shared object file: No such file or directory
[vdpau] Error when calling vdp_device_create_x11: 1
Opening video filter: [screenshot]
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
==========================================================================
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 44100 Hz, 2 ch, s16le, 122.4 kbit/8.67% (ratio: 15294->176400)
Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio))
==========================================================================
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file or directory
AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
Starting playback...
Unsupported PixelFormat 61
Unsupported PixelFormat 53
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
[swscaler @ 0xeedc80]using unscaled yuv420p -> rgb24 special converter
VO: [xv] 320x240 => 320x240 Planar YV12
A: 11.3 V: 11.3 A-V: 0.000 ct: 0.033 0/ 0 2% 0% 0.6% 0 0
sending VFCTRL_SCREENSHOT!
*** screenshot 'shot0001.png' ***
A: 12.6 V: 12.6 A-V: 0.000 ct: 0.033 0/ 0 2% 0% 0.5% 0 0
sending VFCTRL_SCREENSHOT!
*** screenshot 'shot0002.png' ***
A: 13.5 V: 13.5 A-V: 0.000 ct: 0.033 0/ 0 2% 0% 0.5% 0 0
sending VFCTRL_SCREENSHOT!
*** screenshot 'shot0003.png' ***
A: 14.0 V: 14.0 A-V: 0.000 ct: 0.033 0/ 0 2% 0% 0.5% 0 0
sending VFCTRL_SCREENSHOT!
*** screenshot 'shot0004.png' ***
A: 14.5 V: 14.5 A-V: 0.000 ct: 0.033 0/ 0 2% 0% 0.5% 0 0
sending VFCTRL_SCREENSHOT!
*** screenshot 'shot0005.png' ***
A: 14.9 V: 14.9 A-V: 0.000 ct: 0.033 0/ 0 2% 0% 0.5% 0 0
sending VFCTRL_SCREENSHOT!
*** screenshot 'shot0006.png' ***
A: 15.4 V: 15.4 A-V: 0.000 ct: 0.033 0/ 0 2% 0% 0.5% 0 0
sending VFCTRL_SCREENSHOT!
*** screenshot 'shot0007.png' ***
A: 17.1 V: 17.1 A-V: 0.000 ct: 0.033 0/ 0 2% 0% 0.5% 0 0
MPlayer interrupted by signal 2 in module: decode_audio
A: 17.2 V: 17.2 A-V: 0.000 ct: 0.033 0/ 0 2% 0% 0.5% 0 0
Exiting... (Quit)
134/3712MB 1.04 1.06 1.07 3/235 22249
[21681:21677 0:558] 11:50:25 Dom Jun 19 [h4rd3r@arch: +5] ~/Vídeos
(5:558)$
* dessa vez o comando foi executado no local onde o vídeo encontra-se ( /home/h4rd3r/Vídeos ), logo as screenshots estarão ali veja:
http://www.vivaolinux.com.br/album/verFoto.php?codigo=8214