Match quality test

Discussion in 'General Pro Player Discussion' started by James Brown, Jul 21, 2004.

  1. James Brown

    James Brown Semi-Pro

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    Hey guys, im transfering some tennis matches from tapes to my comp. the quality isnt coming out as nicely as I had hoped...anyway, could a few of you download this clip and tell me what you guys think? If people find it ok, i might just torrent a couple of matches (this clip is safin roddick from the aus open).

    http://www.angelfire.com/co4/tennishookup/SafinTest.avi
     
    #1
  2. PureCarlosMoyaDrive

    PureCarlosMoyaDrive Professional

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    Pretty good quality, just kind of choppy playing. I'd take it if I could make it play smoothly
     
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  3. AndyC

    AndyC Semi-Pro

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    Hi James

    More than happy to see someone else posting matches. I'm no expert but here are a few questions and some tips.

    How are u ripping the video to your HD? I assume that you're copying from an analogue source (VHS video?).

    Bear in mind that VHS only has something like a max resolution of 240 lines. Ripping to 480x640 is probably overkill as the quality of the source doesn't really warrant that kind of resolution.. I would suggest something like 288x384.. or maybe 300x400. Going to 480x640 isn't going to provide any more quality then expanding the 288x384 rip to fill the screen and it will take a lot more space.

    I'd suggest encoding the PCM (uncompressed audio stream) in the AVI with an Mpeg encoder of some sort. Something along the lines of 32kHz with a bitrate of 96-112kB/s as it's not really high quality sound.

    Try and get a hold of a program called G Spot. U can use it to analyze your AVI files. Analyzing the clip u posted shows that your video bit rate is 4272 kB/s. Bear in mind that people that rip films get very good quality (better than VHS video) with a bit rate of 1200kB/s (and they are generally using resolutions of 384x512 so your bit rate is overkill and would result in a large file and not a huge improvement in quality). G Spot also calculates something called Qf (quantifier factor) that can be used to gauge what to set the bit rate for video at. For 2CD rips of movies, most rippers use a Qf of 0.26-0.28. Yours works out at 0.464 which is again overkill.

    Have a look at www.doom9.org where there are plenty of guides and there'll probably be one that covers ripping VHS video to Mpegs.

    Look forward to seeing your rips.
     
    #3
  4. James Brown

    James Brown Semi-Pro

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    im taking them off my vcr with my tv capture card. thanks for the advice on lowering file size, thats gonna be a big help :>
    However, maybe you can help me with this. the picture on my comp looks pretty choppy compared to that on my vcr. Any advice on that? I dont have s video on my vcr, only the CVBS RCA connectors.
     
    #4
  5. serveboy

    serveboy Rookie

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    God, anything but VCDs...

    Divx please!
     
    #5
  6. AndyC

    AndyC Semi-Pro

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    Dug up the guides I was talking about.

    http://www.divx-digest.com/articles/vhs_capture.html
    http://www.divx-digest.com/articles/vhs_capture2.html

    Note that the guide suggests ripping at 512x384 as an alternative to 640x480. When I ripped a few video tapes to HD I have to say I found that even 512x384 wasn't that different from 480x360 and I ended up using something between 400-480x300-360 depending on how good the source recording was.

    As for the choppy video.. I would suggest u rip using MJPEG (very low loss compression) or HuffYUV codec (lossless compression) and then reencode those files to a smaller size. That will give u the best quality for sharing.

    What TV capture card do u have? What drivers are u using and what software are u using to rip? I found with my card that the default drivers and software provided were crap. I've changed them to the BTWinCap drivers and use Virtual VCR to record the source and I get much better digital sources for reencoding.
     
    #6
  7. James Brown

    James Brown Semi-Pro

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    i have a leadtek winfast expert 2000, im using the drivers (newest) from their site and im using the winfast PVR (newest), i also tried using virtual dub. neither is of much use/help :>

    serveboy, theres no VCDs, not sure what youre talking about, but feel free not to download anything i post because it isnt aimed at rude people.
     
    #7
  8. AndyC

    AndyC Semi-Pro

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    Nice card. It should do a good job on captures. The default software by all accounts is reasonably good. I would suggest that u capture in MJPEG and then reencode in DixV format. The reason being that every frame captured in the MJPEG stream will be an index frame and will provide equal quality for each frame for the reencoding process.
     
    #8
  9. James Brown

    James Brown Semi-Pro

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    i think it might be possible that my vcr blows too. because im not getting great quality at all. its disheartening.im gonna switch to another vcr/dvd player combo i got at home and see if that works.
     
    #9

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