On Sat, 2008-06-28 at 19:07 -0400, Andy Walls wrote: > On Fri, 2008-06-13 at 09:18 +0200, Levente Novák wrote: > > I have the following problem with my Hauppauge PVR-150 (ivtv from kernel > > 2.6.25) and Composite 1 as input: when a VCR is hooked onto the input > > and is switched on (but play is not yet started), instead of a static > > blue screen with the usual VCR OSD text, I see a picture which resembles > > to a TV station which the frequency is not exactly locked to. In other > > words, the blue screen with OSD is there, but there are a multitude of > > thin horizontal coloured lines, > > What color are the lines? Do they seem to be every other line (i.e. all > the lines in either the odd or even field)? >
The color is mostly red (or reddish), and the positions of the lines vary with every frame (the lines do not have a static vertical position but are rolling back and forth and larger darker bands are also superponating onto these lines). I will send you a 2-seconds capture in private mail to show it. > > the picture flickers, and is constantly > > misaligned horizontally. > > What does > > $ v4l2-ctl --log-status > > show for the card when the blue screen with OSD is displayed? Does it > match the video standard your VCR uses? Especially of interest are the > cx25840 status lines, since that chip does digitization and has > synchronization circuitry, automatic gain controls, chroma subcarrier > lock circuitry, etc. > Status Log: ivtv0: ================= START STATUS CARD #0 ================= ivtv0: Version: 1.2.0 Card: Hauppauge WinTV PVR-150 tveeprom 0-0050: The eeprom says no radio is present, but the tuner type tveeprom 0-0050: indicates otherwise. I will assume that radio is present. tveeprom 0-0050: Hauppauge model 26589, rev C9A5, serial# 9488398 tveeprom 0-0050: tuner model is TCL MPE05-2 (idx 105, type 38) tveeprom 0-0050: TV standards PAL(B/G) PAL(I) SECAM(L/L') PAL(D/D1/K) (eeprom 0x74) tveeprom 0-0050: audio processor is CX25843 (idx 37) tveeprom 0-0050: decoder processor is CX25843 (idx 30) tveeprom 0-0050: has radio, has no IR receiver, has no IR transmitter cx25840 0-0044: Video signal: present cx25840 0-0044: Detected format: PAL-BDGHI cx25840 0-0044: Specified standard: PAL-BDGHI cx25840 0-0044: Specified video input: Composite 3 cx25840 0-0044: Specified audioclock freq: 48000 Hz cx25840 0-0044: Detected audio mode: forced mode cx25840 0-0044: Detected audio standard: no detected audio standard cx25840 0-0044: Audio muted: no cx25840 0-0044: Audio microcontroller: stopped cx25840 0-0044: Configured audio standard: automatic detection cx25840 0-0044: Configured audio system: automatic standard and mode detection cx25840 0-0044: Specified audio input: External cx25840 0-0044: Preferred audio mode: stereo cx25840 0-0044: Selected 65 MHz format: autodetect cx25840 0-0044: Selected 45 MHz format: chroma tda9887 0-0043: Data bytes: b=0x14 c=0x6e e=0x49 tuner 0-0061: Tuner mode: analog TV tuner 0-0061: Frequency: 400.00 MHz tuner 0-0061: Standard: 0x0000000f wm8775 0-001b: Input: 2 ivtv0: Video Input: Composite 1 ivtv0: Audio Input: Line In 1 ivtv0: Tuner: TV ivtv0: Stream: MPEG-2 Program Stream ivtv0: VBI Format: No VBI ivtv0: Video: 720x576, 25 fps ivtv0: Video: MPEG-2, 4x3, Variable Bitrate, 6000000, Peak 8000000 ivtv0: Video: GOP Size 12, 2 B-Frames, GOP Closure ivtv0: Audio: 48 kHz, Layer II, 224 kbps, Stereo, No Emphasis, No CRC ivtv0: Spatial Filter: Manual, Luma 1D Horizontal, Chroma 1D Horizontal, 0 ivtv0: Temporal Filter: Manual, 0 ivtv0: Median Filter: Off, Luma [0, 255], Chroma [0, 255] ivtv0: Status flags: 0x00200000 ivtv0: Stream encoder MPG: status 0x0118, 1% of 8192 KiB (256 buffers) in use ivtv0: Stream encoder YUV: status 0x0000, 0% of 4096 KiB (128 buffers) in use ivtv0: Stream encoder VBI: status 0x0000, 0% of 2073 KiB (81 buffers) in use ivtv0: Stream encoder PCM: status 0x0000, 0% of 643 KiB (143 buffers) in use ivtv0: Read MPG/VBI: 4096/0 bytes ivtv0: ================== END STATUS CARD #0 ================== > > > > Under Windows with WinTV the image is perfect. > > > > One more observation: after pressing on the VCR's play button, the image > > becomes good and the recordings are OK, so the said problem seems to > > affect only the static information screen. > > What about live tv video demodulated by the VCR and sent to the > composite output of the VCR? > I did not try it yet as it would be difficult to hook the antenna cable on the VCR in its actual place. > Have you tried a different compsite video cable? It might matter if the > VCR's generated signal for the blue screen and OSD is of marginal > quality. > Not yet, but I doubt this is the cause. I will try it nevertheless if nothing else helps. > I realize the ivtv driver should be able to perform as well as the > Windows driver, but a cable replacement is still a simple fix if it > resolves your symptoms. > > > > > But as this latter has > > problems, I am not really sure the recordings are OK indeed or I simply > > fail to see the artefacts. > > What ultimately matters are your perceptions. If you perceive the > active playback video looks OK, then you really have no problem. You > can ask someone in their teens or early 20's to confirm the video has no > artifacts beyond the norm for VCRs. (Perceptions of younger people > should be more sensitive to artifacts, but someone that young might not > know the "norm" for VCRs due to limited exposure to older technology.) > > VCR video quality isn't that great. VHS decimates the video to about > half the number of lines being actually recorded onto the tape. VHS also > restricts video bandwidth somewhat (~3 MHz) which affects horizontal > resolution. http://en.wikipedia.org/wiki/VHS > Yes, sure, but waving artefacts are seen on at least the tape I was recording from. From another tape the picture is OK but I will try from Windows if it is even better with the WinTV driver. Thanks for your help! Levente _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
