[lug] Re: ivtv: now what?

Steve Sullivan sullivan at mathcom.com
Tue Jun 5 08:23:39 MDT 2007

Calvin Dodge wrote ...
> Have you tried the relatively crude "cat /dev/video0 >/tmp/test.mpg"?

Wow - /dev/video0 works!  Thank you!  How can I view the file?

$ cat /dev/video0 > temp.mpg
$ file temp.mpg
temp.mpg: MPEG sequence, v2, program multiplex

I've tried ...
  lavplay  only does quicktime and avi
  yuvplay  does nothing
  playdv   just shows random color blobs
  lqtplay  quicktime only
  rootv    appears to be live tv only, not from files
  xine     cannot find decoder (see below)
  mplayer  shows only snow (see below for messages)


xine reports:

xine engine error
There is no demuxer plugin available to handle 'temp.mpg'.
Usually this means that the file format was not recognized.
xine: found demuxer plugin: image demux plugin
xine: found input plugin: file input plugin
xine: couldn't find demux for >temp.mpg<
xine: found input plugin: file input plugin


mplayer plays for the correct length of time (it's a 10 second clip),
but shows only snow.  It reports:

$ /home/ss/ftp/mplayer/tdi/bin/mplayer tempb.mpg
MPlayer 1.0rc1-4.1.2 (C) 2000-2006 MPlayer Team
CPU: AMD Opteron(tm) Processor 246 (Family: 15, Model: 5, Stepping: 10)
CPUflags:  MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE SSE2
mplayer: could not connect to socket
mplayer: Connection refused
Failed to open LIRC support. You will not be able to use your remote control.

Playing tempb.mpg.
MPEG-PS file format detected.
VIDEO:  MPEG2  720x480  (aspect 2)  29.970 fps  8000.0 kbps (1000.0 kbyte/s)
Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
VDec: vo config request - 720 x 480 (preferred colorspace: Mpeg PES)
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
The selected video_out device is incompatible with this codec.
Try adding the scale filter, e.g. -vf spp,scale instead of -vf spp.
VDecoder init failed :(
Opening video decoder: [libmpeg2] MPEG 1/2 Video decoder libmpeg2-v0.4.0b
Selected video codec: [mpeg12] vfm: libmpeg2 (MPEG-1 or 2 (libmpeg2))
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 48000 Hz, 2 ch, s16le, 224.0 kbit/14.58% (ratio: 28000->192000)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
AO: [oss] 48000Hz 2ch s16le (2 bytes per sample)
Starting playback...
VDec: vo config request - 720 x 480 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
VO: [xv] 720x480 => 720x540 Planar YV12
New_Face failed. Maybe the font path is wrong. 2 ??% ??% ??,?% 0 0
Please supply the text font file (~/.mplayer/subfont.ttf).
subtitle font: load_sub_face failed.
A:  10.8 V:  10.9 A-V: -0.177 ct: -0.140 320/320 11%  0%  0.7% 0 0

Exiting... (End of file)


How can I remedy this?

Many thanks,


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