Andei a ler alguns tutoriais de mencoder porém não fui bem sucedido com o comando para gravar a imagem vinda da placa de TV.
Eis o comando que eu usei:
mencoder tv:// -tv driver=v4l2:input=1:normid=4:channel=3:chanlist=us-bcast:width=320:height=240:contrast=-25:saturation=-25:brightness=-0:device=/dev/video0 -vf crop=295:230,scale=320:240 -oac lavc -lavcopts abitrate=128 -ovc lavc -ofps 29.97 -lavcopts vcodec=msmpeg4:vbitrate=800 -o video.avi
E eis o que retornou:
MEncoder dev-SVN-r27458-4.3.1 (C) 2000-2008 MPlayer Team
CPU: Intel(R) Celeron(R) CPU 2.26GHz (Family: 15, Model: 4, Stepping: 1)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.
success: format: 9 data: 0x0 - 0x0
TV file format detected.
Selected driver: v4l2
name: Video 4 Linux 2 input
author: Martin Olschewski <olschewski@zpr.uni-koeln.de>
comment: first try, more to come
Selected device: LifeView/Typhoon FlyVIDEO2000
Tuner cap: STEREO LANG1 LANG2
Tuner rxs: MONO
Capabilites: video capture video overlay VBI capture device tuner read/write streaming
supported norms: 0 = PAL; 1 = PAL-M; 2 = PAL-N; 3 = PAL-Nc; 4 = PAL-60; 5 = NTSC; 6 = SECAM;
inputs: 0 = Television; 1 = Composite1; 2 = Composite2; 3 = S-Video;
Current input: 1
Current format: BGR24
v4l2: current audio mode is : MONO
Selected channel: 3 (freq: 61.250)
Unable to open '/dev/dsp': Device or resource busy
Unable to open '/dev/dsp': Device or resource busy
Unable to open '/dev/dsp': Device or resource busy
v4l2: 0 frames successfully processed, 0 frames dropped.
============ Sorry, this file format is not recognized/supported =============
=== If this file is an AVI, ASF or MPEG stream, please contact the author! ===
Cannot open demuxer.
Percebe-se que o sistema não consegue abrir '/dev/dsp': , além de não conseguir abrir o demuxer.
Mas... eu nem sei o que é demuxer ...