linux-kernel - bttv: video grabbing via v4l1 does not work since 2.6.25

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Date:	Mon, 4 Aug 2008 13:16:54 +0200
From:	"Mario 'BitKoenig' Holbe" <Mario.Holbe@...Ilmenau.DE>
To:	video4linux-list@...hat.com
Cc:	linux-kernel@...r.kernel.org
Subject: bttv: video grabbing via v4l1 does not work since 2.6.25

Hello,

with 2.6.25 bttv video grabbing via vlc stopped working.
vlc is stable version 0.8.6.h which uses v4l(1) interface only.
Up to 2.6.24 everything was working well.
I suspect the reason to be somewhere in the v4l1->v4l2 conversion done
in 2.6.25:

	commit 402aa76aa5e57801b4db5ccf8c7beea9f580bb1b
	Author: Douglas Schilling Landgraf <dougsland@...il.com>
	    V4L/DVB (6911): Converted bttv to use video_ioctl2

	commit e84619b17440ccca4e4db7583d126c4189b987e5
	Author: Nickolay V. Shmyrev <nshmyrev@...dex.ru>
	    V4L/DVB (6410): Partial conversion from V4L1 to V4L2

Video capturing via xawtv (overlay as well as grabdisplay method) does
still work with 2.6.25/26.

I attached the relevant dmesg snippets from bttv initialization and vlc
debugging output both for 2.6.24 and 2.6.26 as well as v4l1-compat debug
messages for 2.6.26 (there are no v4l1-compat messages for 2.6.24).

It seems like vlc is no longer able to select the I420 chroma. Please
also note the changed vlc device recognition from "1 audios" to
"0 audios" in .26. Audio grabbing did stop working as well.

The card in question is a Hauppauge WinTV PCI FM.
The vlc commandline is:
vlc -vv v4l:///dev/video0:adev=/dev/dsp:audio=0:tuner=0:norm=pal:frequency=182250:size=720x576      

If you need more info, please let me know.

Please CC: me in replies, M-F'up2 should be set correctly.

regards
   Mario
-- 
There are two major products that come from Berkeley: LSD and UNIX.
We don't believe this to be a coincidence.    -- Jeremy S. Anderson

View attachment "dmesg.2.6.24" of type "text/plain" (1744 bytes)

View attachment "dmesg.2.6.26" of type "text/plain" (2097 bytes)

View attachment "vlc.2.6.24" of type "text/plain" (978 bytes)

View attachment "vlc.2.6.26" of type "text/plain" (1844 bytes)

View attachment "v4l1-compat.2.6.26" of type "text/plain" (367 bytes)

Download attachment "signature.asc" of type "application/pgp-signature" (482 bytes)