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Panasonic DMR-E50 and Videoplus problem

Discussion in 'Blu-ray & DVD Players & Recorders' started by John Dann, Aug 26, 2003.

  1. John Dann

    John Dann
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    Got a new (7 days) DMR-E50 that seems to be set up and working OK in general, but is giving a major problem with Videoplus on to DVD-RAM. (Maybe it has other faults too but in a few days use this is the current big problem).

    The problem is that after while we can make shorter test Videoplus recordings successfully, when we try longer recordings for real, eg overnight, the recordings disappear. A couple of times now, when the DVD is switched back on in the morning, UNFORMAT appears on the DVD display and the disk is seemingly empty, needing to be reformatted before it will allow further recording. It sort of looks like the recording goes OK but something about switching the DVD back on (ie off the timer) corrupts the disk.

    Any thoughts would be very welcome on whether the DVD-RAM disk might be faulty (it's the one supplied with the DVDR and the only DVD-RAM we've got right now), whether the recorder itself might have a problem or are we failing to do something important in setting up the recording or switching the system back on?

    TIA
     
  2. Northerner

    Northerner
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    I used Video+ for the first time on my E50 for the Hungarian GP on Sunday. This was over about 3 hours and the replay was just fine.

    Might be an idea to try a different DVD-Ram disc as the one you have may be faulty. Your post seems to suggest that you formatted the disc before using it - this isn't necessary for the disc supplied with the E50
     
  3. PhilipL

    PhilipL
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    Hi

    Are you using PDC ON or OFF?

    Regards

    Philip
     
  4. John Dann

    John Dann
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    PDC on generally. Is this significant?

    JGD
     
  5. Tee Tee

    Tee Tee
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    IIRC PDC will only work with channels that actually broadcast the codes. If PDC is set to ON within the timer and a channel does not broadcast the codes then nothing will be recorded.

    Someone please feel free to correct any of the above!
     
  6. PhilipL

    PhilipL
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    Hi

    PDC is a bit of a problem in the UK. There is a ‘light’ version and a full blown version. The full blown version has upto 4 signalling channels that enables programs to be bridged and overlapped (important for the BBC that doesn’t have a big gap between programs) and they can even remotely program the timer for a completely different day or channel if the program is moved to a different slot, although never done in the UK, not to mention in a national emergency they can set your video to record that 4 minute warning!

    As some channels (Channel 4 at the dawn of PDC) implemented the light version first, a lot of manufacturers wrote their PDC code to work with that, but now the BBC and other channels have implemented or moved toward using the fuller PDC spec. It really is a mess, so much so that a lot of people will have given up on PDC a long time ago.

    One issue with the BBC is the continuance of the stop code, quite valid under the spec, but manufacturers seem not to follow it or have only tested against the 'light' version of the spec.

    In short a stop code for the previous program is still being sent while your program is being signalled to start. A badly implement PDC on a video recorder will think the stop is for your program, so you just get the first few seconds if you are lucky. Once the stop code is seen, the timer setting is cleared (this is incorrect it should remain until the early hours of the next morning), so it appears it recorded okay but you have nothing.

    Incidentally, the overlap of these stop codes seem to be worse later in the evening and at night (as the schedules slide or you have tired operators working the switches!), which could explain why test recordings seem to work okay as you are likely testing during the daytime.

    I would try without PDC first to see if your problems are related to this. If you want to use PDC, use the VideoPlus number as normal but then manually change the date of the recording to Every Week on the same weekday rather than for the one day. This does two things, as the recording remains in memory, it will start up again after stopping incorrectly. Secondly you can check afterwards if it failed that you had set it correctly!

    Regards

    Philip
     

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