Confusion on live streaming, video output formats and resolution

Discussion in 'Amateur Video Production' started by johannblake, Jul 3, 2005.

  1. johannblake

    johannblake Guest

    I am new to video recording and want to accomplish the following:

    * Capture live video from a DV camcorder using my PC. The video is not
    recorded on tape first and then transferred.
    * I want the resolution to be as high as possible. I have a laptop with
    a screen resolution of 1440 x 900 and the screen is suitable for 16:9
    format.
    * Most major video editing software should be able to capture from the
    camera.

    Where I have much confusion is on the hardware interfacing and
    understanding what are the resolutions that can be offered. I have seen
    mpeg videos with high resolution that use the full screen. I have no
    idea how these were done.

    My camcorder is equipped with just about every type of interface
    including USB, IEEE 1394, DV, S-Video, AV

    I was able to stream a video using USB but the maximum resolution I
    could obtain was 160 x 120, which is too low.

    I have read on the Internet in various locations that IEEE 1394
    (Firewire) is used for transferring recordings to the computer. But as
    mentioned, I don't want to record anything. I want to send a live
    stream to the computer, so I am not sure whether Firewire is the way to
    go.

    Where the greatest confusion is that I have no idea what resolutions
    are even possible using the various interfaces. For instance, I read
    that DV has a resolution of 720 x 480. I find this strange. After all,
    if the data stored on the video is in digital format, thereotically it
    should be possible for a camera manufacturer to store any resolution
    (i.e., whatever the cameras is capable of) and leave it up to the
    playback hardware/software to read the resolution and scale it
    appropriately.

    Assuming that the DV resolution is 720 x 480, how is this resolution
    increased? My assumption is that the video editing software simply
    increases the resolution when you save the movie in a format such as
    MPEG, which means it would probably lose its quality. Keep in mind that
    this is real time streaming and I am not using a MPEG file. The high
    resolution needs to be displayed in real-time on the screen.

    And what about the S-Video and AV connections? What resolutions do they
    have?

    My computer has a Firewire connection, so if it is possible to use this
    for real-time streaming, that would be great. If not, can you recommend
    an external video capture device that my computer and camera can
    interface with?

    Thank you for any input
    Johann Blake
     
    johannblake, Jul 3, 2005
    #1
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  2. johannblake wrote ...
    Most camcorders will run as cameras if you remove the tape
    cassette.
    DV is DV. If you want higher resolution, you don't want DV.
    That is why there is 16:9, HD, etc.
    Most major video editing software will edit any video for which
    a suitable codec is installed.
    Without specific examples, we can only speculate uselessly.
    99.99% of all camcorders on this planet use Firewire to do
    full-size, full-speed video transfer (i.e. "DV"). USB is used
    only to download still photos and for low-res "webcam".
    You are forgetting that the rest of us want to be able to have
    our video viewable on standard tape/disc players and TV sets.
    For that reason, DV is limited to the resolution (spatial and
    temporal) of NTSC or PAL.

    If you need some special distribution/display methodology
    and can use higher resolution, then you have graduated
    beyond DV and are talking about big-$$$.
    DV resolution cannot be increased in any practical manner.
    It was limited to 720x480 at the very first step (the optical
    pickup mechanism.)
    They are *all* NTSC (or PAL depending on where you are)
    Yes, theoretically you can use your Firewire port to transfer
    video from your camcorder, either by playing back a tape, or
    by using the camcorder as a live camera (take out the tape to
    avoid automatic shutdown).

    Note that there are now appearing relatively low priced ($5K)
    HDV camcorders. Of course, there is no practical distribution
    methodology available yet (i.e. DVD, etc.)
     
    Richard Crowley, Jul 3, 2005
    #2
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