scrambled video with bttv driver and bt848 (card=98)

scrambled video with bttv driver and bt848 (card=98)

[Ryan Churches]

I built the bttv driver as a module, and modprobed it with and without
card=98...

http://www.ubintel.com/files/nph-zms.jpeg  <---this is a still shot of
the video I get as seen from ZoneMinder.  In case you can't tell what
you are looking at, the bottom and top of the image are transposed
across the black horizontal bar going through the shot.  That bar
moves as the video is played, giving it the appearance of an 8mm movie
film which has gone off track.  The others are worse than that.  I
have 12 non-identical cameras which all do that to varying degrees.

If i cat the video to a file and try to play it in VLC, i get no
video, and the output of VLC says:

[mp3 @ 0x2aaabda32340]Could not find codec parameters (Audio: mp1, 448 kb/s)
[00000308] ffmpeg demuxer error: av_find_stream_info failed
[00000308] ps demuxer error: cannot peek
[00000304] main input error: no suitable demux module for
`/:///home/brian/Desktop/test.mpg'
[00000232] main playlist: nothing to play
[00000232] main playlist: stopping playback



When I load the module, I got one of these in my dmeg for every PVR chip:

isabel ~ # modprobe bttv
card=98,98,98,98,98,98,98,98,98,98,98,98,98,98,98,98 (i have 2x8chip
cards so i pass 16 '98's)
isabel ~ # dmesg |tail -n 16

bttv: Bt8xx card found (15).
bttv15: Bt878 (rev 17) at 0000:05:0b.0, irq: 21, latency: 32, mmio: 0xfdbf1000
bttv15: subsystem: 1836:1540 (UNKNOWN)
please mail id, board name and the correct card= insmod option to
video4linux-list@redhat.com
bttv15: using: ProVideo PV150 [card=98,insmod option]
bttv15: gpio: en=00000000, out=00000000 in=00ffffff [init]
i2c-adapter i2c-15: adapter [bt878 #15 [sw]] registered
i2c-dev: adapter [bt878 #15 [sw]] registered as minor 15
i2c-adapter i2c-15: found normal entry for adapter 15, addr 0x50
i2c-adapter i2c-15: master_xfer[0] W, addr=0x50, len=0
i2c-adapter i2c-15: master_xfer[0] W, addr=0x50, len=0
i2c-adapter i2c-15: client [tveeprom] registered with bus id 15-0050
bttv15: tuner absent
bttv15: registered device video16
bttv15: registered device vbi15
bttv15: PLL: 28636363 => 35468950 . ok



If i dont pass the card=98 option and I load the module, it autodetects card=0

lspci says:

isabel ~ # lspci -vv|grep -A 12 -m 1 Brooktree
04:04.0 Multimedia video controller: Brooktree Corporation Bt878 Video
Capture (rev 11)
        Subsystem: Credence Systems Corporation Device 1540
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 32 (4000ns min, 10000ns max)
        Interrupt: pin A routed to IRQ 21
        Region 0: Memory at fdcff000 (32-bit, prefetchable) [size=4K]
        Capabilities: [44] Vital Product Data <?>
        Capabilities: [4c] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: bttv
        Kernel modules: bttv


Interestingly, only ZoneMinder gives me any playable "video" in the
form of mjpeg, while neither mplayer nor VLC can play the files i make
from catting /dev/videoX.  Not sure how exactly it does it, but in ZM
Ive tried PAL vs NTSC, RGB24 vs Everything Else, and standard monitor
resolutions like 640x480, 320x240. etc.  Nothing seems to stabilize
the video.

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Re: scrambled video with bttv driver and bt848 (card=98)

[Daniel Glöckner]

On Wed, May 21, 2008 at 09:20:02PM -0400, Ryan Churches wrote:
> http://www.ubintel.com/files/nph-zms.jpeg

Looks like wrong tv standard.

> If i cat the video to a file and try to play it in VLC

cat /dev/videoX > file will never produce anything playable with bttv.
The bt878 can not compress your pictures. Your file will contain
uncompressed pictures without any headers that indicate the size.

> bttv15: subsystem: 1836:1540 (UNKNOWN)
> please mail id, board name and the correct card= insmod option to
> video4linux-list@redhat.com

What is your card's name?
This id is completely different from the PV150 id's in the driver.

> bttv15: PLL: 28636363 => 35468950 . ok

So it's trying to capture PAL video.
Do you live in a NTSC country?
If not, do you even have a 28.6 MHz crystal on your card?

  Daniel

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