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  1. Hello all. I've got this AVI file that I've been wrestling with. The first problem I think I've solved. I was trying to get the audio extracted, but it was giving me errors when I used VitrualDub. Even if I used No Compression and saved the raw wav file, would still present me with errors. I ended up using something from the DVD2AVI package, & that got me a working wav file.

    Now the second problem I've been having is getting my encoded file to present properly in it's original aspect ratio. When I use GSpot on the original AVI, it says: 624x352 (1.77:1) [=39:22] however I can't seem to find a way to make this thing present after the encoding process is finished.

    I've been using Mainconcept MPEG Encoder.

    Joe
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  2. Joe,

    Resolution of an AVI doesn't have any effects on its aspect ratio. Just encode it as 4:3 or 16:9, depending on what it actually should be. I know in TMPGEnc, you set the Source Aspect Ratio to 1:1 for an AVI.

    Sorry I can't offer any more help,

    Cobra
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  3. Always Watching guns1inger's Avatar
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    What is your target format ?

    PAL 4:3 - 720 x 444 (720 x 576)
    PAL 16:9 - 702 x 576 (720 x 576)

    NTSC 4:3 - 720 x 370 (720 x 480)
    NTSC 16:9 - 702 x 480 (720 x 480)

    The file is slightly taller than 16:9 hence the pillarboxing. I would download the free FitCD tools (find it in the tools section), and use it's avisynth script to resize and feed thsi to mainconcept.
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  4. Well, I tried TmpgEnc for the first 10 minutes of the film and checked it. It seemed to do the trick. It was nearly the same as the original AVI.

    When I was using Mainconcept, I was picking NTSC. My target is:
    NTSC 16:9 - 702 x 480 (720 x 480)

    ... and the aspect didn't look right. It seemed taller than it should have been. TmpgEnc seems to work. I just now wonder what I was doing wrong in Mainconcept.

    (update: back from work, & the file is okay from tmpgenc)
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  5. Why are you selecting 16:9? Do you actually have a widescreen 16:9 TV to watch it on?

    p.s. don't ya just love "decompress.exe"?
    Cheers, Jim
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  6. I was picking 16:9 because that was what the source came from, GSpot said the AVI was 177:1. But I have a 4:3 telly. Maybe that was why MainConcept wasn't working... I should have told it 4:3.


    p.s. decompress is a gem, but it failed when I initially tried to pull out my 'wav'.
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  7. Member Cornucopia's Avatar
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    (Note: I'm assuming NTSC here)

    IF you assume that your PAR (Pixel Aspect Ratio) is 1:1 aka Square computer pixels, then 624x352 is nearly (but not quite) 16:9 aka 1.777.

    AVI files don't take note of any PAR except 1:1, unless it's built into the parameters/syntax of the codec used (e.g. DV, DivX or Mpeg). Then it depends on the player smarts on whether it'll show up with the correct Aspect Ratio on you PC.

    MPEG files DO take note of the PAR and DAR, and even if a PC player app doesn't do it's job in recognizing it as such, a settop player will correctly resize to the appropriate aspect ratio.

    My guess is that your Mainconcept encode (to MPEG2, I assume) was done correctly, but that the player you viewed it on was a software PC app (WMP, by any chance? ) didn't show it correctly. If you had continued with it and authored and burnt it to disc and played it on a settop, it might have actually shown it correctly.

    Back to your (624x352) file...

    Assume it's PAR is 1:1, its DAR is ~16:9. Is it interlaced? (probably not now)
    I would suggest that you...

    Pad Top,Bottom,Left,Right with Black to 640x360,
    Resize Width to 704x360,
    Pad Left,Right with Black to 720x360,
    and then either:

    A. Resize Height to 720x480 and encode as Anamorphic 16:9
    -or-
    B. Pad Top,Bottom to 720x480 and encode as 4:3 with hard coded letterboxing

    Which way depends on quality requirements (and the expertise of the software and hardware resizing algorithms) and on whether you plan on upgrading at some point to a Widescreen TV.

    HTH,

    Scott
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