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Transfering to pc Via usb2

Discussion in 'Camcorders, Action Cams & Video Editing Forum' started by sadmikey, Jan 11, 2005.

  1. sadmikey

    sadmikey
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    Hi
    i am new to this having got a JVC GRD93 for xmas
    i have managed to work out most features etc but have a few
    question about tranfering files to my PC

    1. what format is the video recoreded as on the tape ?

    2. i can transfer the video using the supplied sofware
    but i have to "play" the recording to transfer it onto the hard disk
    is this normal ?. i would have thought i could transfer the data
    as a file at a much faster rate

    can anybody point me go a good source of info for beginers

    thanks :confused:
     
  2. Brian110507

    Brian110507
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    The video is recorded on the tape as DV and will be imported to your PC using FIREWIRE as DV-AVI you cannot get good stable high quality video using USB2, you need a firewire card in your PC and a firewire cable to connect the camera to your PC. You will then find that your PC will control the camera and you will not have to start it manually.

    The transfer from camera to PC can only be done in real time - one hour of video will take one hour to transfer.

    These forums are an excellent source of information for beginners.
     
  3. MarkE19

    MarkE19
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    As said you do need to transfer via firewire to get full quality onto the PC. If you do not have a firewire port on the PC then it can be added for about £10 on a standard PCI card. This will normally include a cable as well.

    A camcorder writes the video to a tape. To get the video off the tape you have to play through the tape from start to finish. A camcorder will only play back the tape in real time so there is no faster way to get the video onto a PC. The transfer via firewire is a 100% copy of the footage as recorded onto the tape in the camcorder.

    Mark.
     
  4. sadmikey

    sadmikey
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    Thanks

    im getting the hang of what happening now

    one more question

    what is happening when i capture usung my usb2 port

    is the software on the pc converting the AVI DV
    or is the camcorder giving out a differnt signal
     
  5. MarkE19

    MarkE19
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    AFAIK the file being output by the cam over USB is a lower quality file as USB simply cannot transfer full quality AVI files. I've never done it as I don't have USB on my cam but would assume a lower resolution and frame rate will be transfered, but it is likely to still be an AVI file once on the PC.

    Mark.
     
  6. thebrummy_one

    thebrummy_one
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    It is my understanding that USB2 tranfer rate is 480mp/s. This is comparable to firewire that has a rate of 400mb/s. So it should be the same. I read somewhere that there are cams now coming out with only USB2 ports on them. If this is right, then firewire will become redundant. It would be interesting to see a comparison of the two. I think you should humour us and buy a firewire cable just to see!!
     
  7. sadmikey

    sadmikey
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    good idea !
    i am transfering with usb2 so the rate is good
    i am using the software that came with the camcorder
    the files seem to be captured as MPeg
    which i believe is a compressed format
    does this mean they will be of lower quality ?
    as they files need to be mpeg to be put on a dvd
    does this matter
     
  8. sadmikey

    sadmikey
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    the software is pixele imagemixer v1.7
    before anybody asks
     
  9. sadmikey

    sadmikey
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    just one more thing
    how do i tell the resolution and frame rate of the captured files ?
    thanks for all your help
     
  10. Brian110507

    Brian110507
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    In *most* editing software if you right click on a video clip you should be able to select properties and that should tell you resolution etc.
     
  11. MarkE19

    MarkE19
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    USB2.0 is in deed faster than firewire, but unlike firewire where the speed is constant, USB speed is peak only. Therefore as video needs a constant speed for full bandwidth transfer USB2.0 can not keep up.
    There are now new cams being released that record to memory cards/internal memory with MPEG-4 compression. These are likely to only have USB interfaces as that is all that they need. Are there any USB only DV cams around?

    I have plenty of USB cables, just no USB port on my Sony TRV-900e camcorder.

    Mark.
     
  12. MarkE19

    MarkE19
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    MPEG compression can be done well with little noticeable loss of quality, but if done badly can be awful! Where the problems start is when you try to edit the compressed video. Many programs will need to convert the files again resulting in quality loss. Other programs can edit the compressed file, but due to the fact that a lot of the origional information is lost in compression the files can not be edited with frame accuracy.

    Mark.
     

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