Lossless compression for .avi to FTP

Discussion in 'Amateur Video Production' started by GaryT, Nov 20, 2005.

  1. GaryT

    GaryT Guest

    I have about 65 GB of captured video I need to move to my home computer. The
    files are currently on a production machine at work or I would simply pull
    the HD. Is there any way to shrink the files (zipping or whatever) so I can
    transmit them more quickly or fit them on to a USB or FireWire HD, yet get
    back the original .avi files?

    GaryT, Nov 20, 2005
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  2. GaryT

    marks542004 Guest

    You can use Winzip to compress the files to a .zip file. It is a
    lossless compression but you would need to try it to see what level of
    compression you can get. If your files are DV-avi you might get a good
    compression rate, mpeg2 not so much.

    A external hard drive would be the easier method since you would not
    have to break the files up into groups as you would with burning to cd
    or dvd.

    Transferring 65gb is still going to take a while even to an external
    hard drive.

    Could you bring your home PC into work and transfer directly system to
    system ?
    marks542004, Nov 20, 2005
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  3. GaryT

    PTravel Guest

    I'd be surprised if you get any. DV-25 is already compressed 5 to 1. The
    only way mpeg (and, for that matter wmv and similar compressions schemes)
    get any smaller is by doing temporal compression, i.e. measuring the change
    over time and then storing only that which is changed. Zip is, as you note,
    straight lossless compression and will not realize any compression gain over
    what has already been achieved by the DV-25 codec.
    The easiest way would be to transfer the video to a miniDV tape by playing
    it real time to a DV camcorder over a 1394 port, and then transporting the
    camcorder and tape to the second machine and capturing it back. There will
    be no loss of data and the realtime transfer would probably be as fast as
    using Windows to copy from drive to drive. 65 gig is nearly 5 hours of
    PTravel, Nov 20, 2005
  4. GaryT

    Markus Zingg Guest

    There will
    Errr - what? No, copying disc to disc is factors faster than using the
    DV tape. DV video has a datarate of ~3.5MB/sec. Modern harddiscs
    easily manage a lot more, hence copying disc to disc would be a couple
    of times faster depending on the HD subsytem used.

    Don't get this wrong, I agree that using a DV transfer in this
    scenario is probably not the worest idea if copying disc to disc is
    not possible due to whatever reasons.

    Markus Zingg, Nov 21, 2005
  5. GaryT

    GaryT Guest

    OK, the external drive is probably my best bet. Or this might be my big
    excuse to buy an iPod. ;-)

    GaryT, Nov 21, 2005
  6. GaryT

    PTravel Guest

    The Windows OS imposes a substantial overhead on copy operations. Between
    opening and closing the computers and installing and uninstalling the hard
    drives, added to the OS overhead, I'd be surprised whether there's any time
    advantage to HD to HD transfer.
    PTravel, Nov 21, 2005
  7. "Markus Zingg" wrote ...
    I would agree that HD to HD transfer is at least 10x (or more) faster
    than real-time writing back to tape.
    Also agree that writing back to tape may be the only practical
    solution in this case unless they want to use a plug-in HD of
    some sort.

    I really like my USB to IDE cable (which comes with a brick
    power supply). You can plug the IDE cable and the power
    cable into the hard drive, and then hot-plug the USB cable
    into your computer and have a "portable" drive of whatever
    size you need. I bought a couple a coupe of these things for
    $12 at Geeks.com It is really quite convienent.
    Richard Crowley, Nov 21, 2005
  8. And also with the right adapter, you can plug a 2-1/2" (notebook
    computer) hard drive into it as well.

    I have also used the USB to IDE cable to run a CD drive
    successfully, when my built-in drives were unable to rip a
    particular CD to MP3 The reason was unknown, but the work-around was
    good enough for me...

    To quote you (because I totally agree), "It is really quite

    Gene E. Bloch, Nov 21, 2005
  9. The best way to share DV projects is to start with proper planning. The
    original tapes contain the necessary scenes for the project. First create a
    batch capture for those tapes and save them. Once these capture files are on
    the hard disc of one computer, repeat capture on the second.

    Whenever you work on the project do so with the same NLE software on each
    computer. Should have said this before batch capture. Whenever changes are
    made to one computer save the project file and copy to floppy disc. Copy
    project file from floppy to second computer and open the project in the NLE
    software. Whenever there have been preview files completed the software will
    ask where they are, skip those and re-create them according to the project

    When moving to the first computer save project and repeat these steps.
    Simple enough if you plan ahead. If not, then there you are.
    Larry Johnson
    Digital Video Solutions

    877-227-6281 Toll Free Sales Assistance
    386-672-1941 Customer Service
    386-672-1907 Technical Support
    386-676-1515 Fax
    Larry Johnson, Nov 21, 2005
  10. GaryT

    Markus Zingg Guest

    The Windows OS imposes a substantial overhead on copy operations. Between
    No ofense, but I really don't need 5 hours to temporaraly hook up an
    IDE drive to a system for a one time copy operation. Also since the
    transfer rate seems to be ~10 times faster even on windows systems, it
    might really be worth it. OTOH, if the system can't be touched (which
    is likely if it's not the OPs own system) your aproach is obviousely a
    good one. Especially considering the fact that the transfer can be
    made in the background.

    Markus Zingg, Nov 21, 2005
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