TRV900: Single frame audio dropout with perfect video

Discussion in 'Amateur Video Production' started by arb2004, Aug 4, 2006.

  1. arb2004

    arb2004 Guest

    Setup: capturing DV from PAL Sony TRV900E into Premiere Elements 2.0
    over firewire.

    Problem: Video captures perfectly but every 2 to 10 seconds (apparently
    random) a single frame of audio is dropped. Switching to a different
    miniDV camera (an old Panasonic) as the player with the identical
    setup, cables and tape results in perfect capture.

    Question: has anyone seen a situation in which the firewire transfer
    can lose a single frame of audio like this? Is this a known Sony issue?
    The strange thing is that playing the tape on the Sony and
    watching/listening to it on the camera shows no playback problems with
    audio or video, but there is always an audio problem when capturing
    from it, so it can't be the playback heads.

    Andrew
     
    arb2004, Aug 4, 2006
    #1
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  2. arb2004

    Steve King Guest

    Andrew, have you examined the video frame, where the drop out occurs. I
    have had this happen with one tape. In each of several dropouts on that
    tape I noticed the audio drop out and did not notice anything wrong with the
    video; however, on more careful examination, in each instance of drop out I
    found from one to several pixels of video information corrupted. Since you
    were able to play it back flawlessly in another camera, I would suspect
    something with the heads of the original camera.

    Steve King
     
    Steve King, Aug 4, 2006
    #2
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  3. arb2004

    arb2004 Guest

    Thanks for the reply.

    It actually plays back flawlessly in the SAME camera, which is what
    makes me think it can't be the heads (or the tape, obviously). There
    seems to be some fault that occurs in the capture process that is
    unique to the Sony camcorder and only affects the audio, not the video.
    Very strange...

    Andrew
     
    arb2004, Aug 4, 2006
    #3
  4. arb2004

    Steve King Guest

    I misunderstood. It sounds more like a slight mis-alignment of heads, to
    me. I use several Sony Cameras and decks. None have any capture
    strangenesses. I don't believe that is possible. I believe the ones and
    zeros are getting mixed up before the leaving the fire-wire port. Are you
    possibly using LP rather than SP. You probably said something about that in
    your original post, but I forget.

    Steve King
     
    Steve King, Aug 4, 2006
    #4
  5. arb2004

    arb2004 Guest

    I would have thought a head misalignment too, except that it seems
    absolutely fine when playing back inside the camera. I can't understand
    how it could send a worse signal down the firewire line than when it is
    in camera. At least I have a workaround by using my old camcorder.

    The TRV900 is a good camera but is getting pretty old now. It has had a
    rough life and been on beaches and in at least 3 continents. Do you
    have a view on a good replacement for it? I don't want a large camera
    like a VX2000. Just something of good quality that is no larger than
    the TRV900. Even a good single CCD camera may be enough.

    Thanks

    Andrew
     
    arb2004, Aug 4, 2006
    #5
  6. arb2004

    Steve King Guest

    However, I don't believe that you can examine individual frames in-camera.
    Very minimal 'dropouts' will simply not be seen in the camera monitor.
    Those dropouts may last for only a few frames. From an earlier thread on
    MiniDV Dropouts I learned that there is playback compensation for such
    things on the video side. On the audio side, there is not such
    compensation.
    Sorry. I haven't looked into 3-ccd cameras in this price range. However, I
    have a single-chip camera, a Sony TRV11, that I like a lot for a casual
    camera. I have even used it many times for shots in professional
    productions, where I was unwilling to risk my more expensive equipment. I
    used it this week for a GlideCam shot in a very dusty location. They are
    available on Ebay for around $400. I'm sure there are many newer, better
    choices out there.

    Steve King
     
    Steve King, Aug 5, 2006
    #6
  7. arb2004

    Paul Guest

    Andrew,

    My NTSC TRV900 had the same problem a few years ago. It was due to a
    cracked bit in the tape path, causing some mis-alignment. (I don't
    recall the details, it was a while ago.) I took it to Sony for their
    fixed price service, and it's been fine since. (They did a host of other
    things as well, including new heads). There was some info on the web
    about it at the time, but the site I was looking at then has changed.

    The good news is the problem was a playback problem, not a record
    problem. When I got the camera back, I just re-captured the clips and
    all was well.

    Paul
     
    Paul, Aug 5, 2006
    #7
  8. arb2004

    Andrew B. Guest

    Thanks Paul (and Steve). For the time being I have a workaround since
    the TRV900 records perfectly and my Panasonic plays the tapes into my
    PC fine over the firewire. It's probably good not to stress the 900s
    heads by using it for playback anyway.

    Andrew
     
    Andrew B., Aug 6, 2006
    #8
  9. arb2004

    dennis Guest

    I have the same trouble. But the problem is not in the cam or
    capturing. It's in Premiere. When playing the file in windows Media
    Player the sound is ok. Import in Sound forge - ok. In premiere - audio
    frames drop outs.
     
    dennis, Aug 10, 2006
    #9
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