dropping frames (simple question)

Discussion in 'Amateur Video Production' started by 5, Jan 18, 2004.

  1. 5

    5 Guest

    x-no-archive: yes

    Simple question, can't find simple answer.

    What's the largest resolution I should be able to capture without dropping
    frames using UNcompressed AVI ? I tried different programs and got similar
    results.

    The only way I don't drop frames is when I capture with compression, is this
    normal ?

    I have win 98 on one partition, and somebody said get win xp, so I did and
    put it on an NTFS partition. I drop even more frames with xp.


    THANKS
    My computer
    ram: 1gb
    cpu: p4 1.8ghz
    hd: ata 133, but the controller is ata 100
    video card: all in wonder 128 pro
     
    5, Jan 18, 2004
    #1
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  2. 5

    Bariloche Guest

    I can capture uncompressed Avi with 0 dropped frames under WinMe with
    an Athlon 2200 and a 7200 harddrive. The capture card is a Sapphire
    Radeon 9000 All-In-Wonder.
    I do use Huffyuv, anyway, as it is a lossless compression codec.
    Of course. WinXP is a tortoise.
    Wonder which is the weak part here. Assuming your harddrive is a 7200
    rpm, which looks mandatory to me. Not CPU, because it is compressed
    video that demands processing power.
     
    Bariloche, Jan 18, 2004
    #2
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  3. I can capture without dropping frames, uncomrpessed DV, on an Inspiron 8100
    w/ a 1GHz PIII and 5400 rpm internal drive using Linux with a 2.4.23
    kernel. It's the slowest machine (and hard disk), that I've got so I can't
    test any lower. The video card is an ATI Mobile Radeon 7500, if that
    matters.
     
    James McIninch, Jan 19, 2004
    #3
  4. 5

    Bariloche Guest

    DV is already a compressed format, with a rate of 3,2 Mbytes/second. I
    can also capture without dropping frames at that bitrate with

    DC10 card (gives MJpeg from analog)
    AMD K6-2 400 MHz
    5400 rpm harddrive
    Win98

    but not at 6 MBytes/sec. Capturing uncompressed video, which has 5
    times as much bitrate, needs something much better.
     
    Bariloche, Jan 19, 2004
    #4
  5. 5

    jon Guest

    DC10 card (gives MJpeg from analog)
    I can capture uncompress video without frame losses with a celeron 800
    and old ata 33 hardisk (useless anyway because its low capacity). So
    you don´t need much better to do the job. I think problem is there are
    so many things that can bottleneck the capture that it usually happens
    in many systems.

    In your case perhaps your IDE chipset needs very much CPU power to
    save 6 MB/s and your hardrive really it´s not working at his maximum
    speed. Moreover little CPU will remain to manage with video capture
    card. A little better CPU, pentium III, will do.
     
    jon, Jan 20, 2004
    #5
  6. 5

    Bariloche Guest

    And that drive can write at 30 Mb/s? I'm amazed.
    Thanks jon, but I do not really have the problem, as I have a second
    computer with an Athlon 2200, and AIW, etc. where I can capture
    uncompressed video fine.

    But the OP has an 1.8 GHz Pentium 4, and fails to capture uncompressed
    video.
     
    Bariloche, Jan 21, 2004
    #6
  7. 5

    jon Guest

    I can capture uncompress video without frame losses with a celeron 800
    Yes I also think it´s amazing but true. Moreover it can write
    uncompress video (without preview) but cannot play it at all. Surely
    cpu power it´s not enough to take care of harddisk reading and
    displaying video alltogether (that´s because I told you about your cpu
    because your harddisk must be enough). I check that video it´s OK with
    virtualdub playing frame by frame.
     
    jon, Jan 22, 2004
    #7
  8. 5

    5 Guest

    x-no-archive: yes

    OP here

    I borrowed a PCI controller, but that was worse, so it's not the MB
    controller. The HD speed is 7200, it's a good model from what I've read. I
    guess the problem is the old SDRAM. It's really not meant for a P4, why did
    Intel even design a chipset to support this configuration ?


    BTW, this is analogue capture I'm talking about, the card is cool, ATI All
    In Wonder
     
    5, Jan 22, 2004
    #8
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