Hello,
a year ago I bought a device named Hama Video Editor, which was not
(and is not yet) supported by the em28xx driver.
So I played around with the card parameter and got the device basically
working with card=38.
Basically working means, that I had a distortion when capturing old
VHS-Tapes from my old vcr.
The problem can be seen here:
http://www.michael-ruettgers.de/em28xx/test.avi
A few weeks ago I started tracking down the reason for this issue with
the help of Devin.
Wondering, that the device works perfectly in Windows, I compared the
i2c commands, that programmed the register of the tvp5150 in Windows.
Finally I got the device working properly, setting the TV/VCR option
in the register Operation Mode Controls Register at address 02h
manually to Automatic mode determined by the internal detection
circuit. (default):
000109: OUT: 00 ms 107025 ms 40 02 00 00 b8 00 02 00 02 00
After programming this register, the distortion issue disappeared.
So my conclusion was, that the TV/VCR detection mode is forced to
TV-mode in the em28xx, which could have been verified by a look into the
debug output using the parameter reg_debug=1:
OUT: 40 02 00 00 b8 00 02 00 02 30
Bit 4, 5 are used for setting the TV/VCR mode:
Description in the Spec:
TV/VCR mode
00 = Automatic mode determined by the internal detection circuit.
(default)
01 = Reserved
10 = VCR (nonstandard video) mode
11 = TV (standard video) mode
With automatic detection enabled, unstable or nonstandard syncs on the
input video forces the detector into the VCR
mode. This turns off the comb filters and turns on the chroma trap
filter.
Thus far the tvp5150 distortion issues when capturing from vcr.
---
The device not supported yet but mostly working with card=38 has the
following features:
1 Button
1 LED
1 S-VHS input
1 Composite video input (Chinch)
1 Stereo audio input (2 x Chinch)
The inputs are matched correctly to the video sources in a viewer-app
(S-VHS - S-VHS, Composite - Composite1).
It's product name is Hama USB 2.0 Video Editor:
http://www.hama.de/portal/articleId*139673/action*2563
This board has no unique USB ID but could be detected by its i2c
devicelist hash 0x77800080:
[ 119.160182] em28xx: New device @ 480 Mbps (eb1a:2861, interface 0,
class 0)
[ 119.160297] em28xx #0: chip ID is em2860
[ 119.283595] em28xx #0: board has no eeprom
[ 119.300289] em28xx #0: Identified as Unknown EM2750/28xx video
grabber (card=1)
[ 119.323789] em28xx #0: found i2c device @ 0xb8 [tvp5150a]
[ 119.332914] em28xx #0: Your board has no unique USB ID and thus
need a hint to be detected.
[ 119.332917] em28xx #0: You may try to use card=n insmod option to
workaround that.
[ 119.332919] em28xx #0: Please send an email with this log to:
[ 119.332920] em28xx #0: V4L Mailing List
linux-media@vger.kernel.org
[ 119.332922] em28xx #0: Board eeprom hash is 0x
[ 119.332924] em28xx #0: Board i2c devicelist hash is 0x77800080
This board seem to be branded under another name in Austria:
http://lists-archives.org/video4linux/27246-empia-device-without-unique-usb-id-or-eeprom.html
On Mon, Apr 20, 2009 at 9:06 AM, Anthony Hogan anthony-...@xxx
wrote:
Aldi (Supermarket chain) Fission (home brand) USB hi-speed dvd maker
Aldi Product number/SKU: 6675
Model Number: DK-8703
Composite + SVHS video input
Stereo line-level audio input
Single button, single LED
No FCC ID (intended for Australian/European market, only has CE and
Tick mark)
---
I would appreciate to see this device beeing detected and working
correctly for capturing even from a vcr with weak sync signals.
Thanks.
Regards,
Michael Rüttgers
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