Jan Stary wrote:
Some time ago, when I looked into something similar, all the
supported
cards that I found could only record incomming video at 1/2 res max.
Whether this is a limitation of the bt848 chipset, I didnt bother to
verify.
what do you mean by 1/2 res?
the bt8x8 (also conexant fusion 878) chips can capture full
resolution
NTSC (640x480) or PAL (768x576).
By half res, I mean 360x240.
hmm, 360 is not a multiple of 16, nor is 360/240 == 4/3. sure you
don't
mean 320x240?
Sorry, yes of course. that's a typo.
It must have only been a limitation of the various cards I could find
info on.
I should perhaps clarify that this limitation only applied to the
video
input from the external video connectors, not to the tuner output,
which
could be recorded at full resolution on all the cards I looked at.
That may not have been clear from my use of the term 'incomming
video'.
Seems I am experiencing something similar.
Capturing on OpenBSD 4.6 (dmesg below), trying
both the ffmpeg package and the latest SVN version,
if I specify bigger '-s' than 'qvga' (320x240), I get
FFmpeg version SVN-r20569, Copyright (c) 2000-2009 Fabrice Bellard, et al.
built on Nov 21 2009 15:42:46 with gcc 3.3.5 (propolice)
configuration:
libavutil 50. 4. 0 / 50. 4. 0
libavcodec 52.41. 0 / 52.41. 0
libavformat 52.39. 2 / 52.39. 2
libavdevice 52. 2. 0 / 52. 2. 0
libswscale 0. 7. 1 / 0. 7. 1
TVTUNER_SAUDIO: Input/output error
and nothing else happens. With
ffmpeg -y -an -v 1 -f bktr -r 25 -s qvga -i /dev/bktr0 /media/NEW/video.avi
I can capture the video (black-and-white, though):
Notice you said black and white.
A little known fact is that most S-video to RCA adapters are not wired
to maintain color signal.
These can be bought, however and are cheap.
Not sure this is relevant to your case, but could really help someone
else having problems.
Chris Bennett
--
A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
-- Robert Heinlein
