MJPEG conversion

[CrackTheSky]

Ok this is driving me nuts. I'm using live-action in a video I'm working on. The camera I used to shoot it is a Canon S3 IS - a digital camera (NOT a video camera). I have nothing else ;_; Anyway, I shot some footage back in like January and converted the video files to a lossless codec using VDM just fine.

Now, since I picked up the project again, I wanted to shoot some more footage for the video. So I did, and when I tried to open the video files in VDM using the EXACT SAME scripts I used to open them several months ago, I get weird error messages.

Here's my script:

Code: Select all

loadplugin("E:\Program Files\AviSynth 2.5\plugins\directshowsource.dll")
directshowsource("green2.avi")
converttorgb24()
assumefps(23.976)
crop(30,0,-30,-0)
lanczosresize(720,480)
vaguedenoiser(threshold=0,wiener=true)

(Don't ask about the loadplugin line; for some reason I have to type that in for VDM to recognize DirectShowSource - don't get caught up on it).

Now, when I try to open this script in VDM, I get an error message that says:
"AviSynth open failure:
Crop: Destination width is 0 or less"

wtf? So I comment out the crop line, try again. Next error message:
"Resize: Source image too small for this resize method"

...Ok, comment out the resize line (and I tried several different kinds of resize plugins like bilinear and bicubic), and I get another one:
"VagueDenoiser: YV12, YUY2, RGB24 and RGB32 (so what are you using?) only"

Try every different kind of colorspace, same message. Comment out the VagueDenoiser line just to try to open the video at ALL and I finally get an error message that says:
"No video stream found"

...And now I'm at a loss. I did not have this problem earlier, and I think maybe it has something to do with my having downloaded the newest AMVapp since then. If worse comes to worse I can always uninstall v3.0 and reinstall the old one just to see if that IS the problem, but I don't feel like I should have to because, well, that doesn't make a whole lot of sense to me.

The video is encoded in MJPG in an .avi container; weird thing is, when I try to put the video in Vegas, only the audio stream shows up, but I seem to remember this happening last time too. I can play the video just fine in MPC, but for some reason the damn thing just will not load in VDM and I have no idea why.

Any ideas?

[Scintilla]

1) Shouldn't you be using AVISource() for AVI files?

2) That should be Crop(30,0,-30,<b>0</b>). No negative sign required for zeroes.

[Kionon]

1) Shouldn't you be using AVISource() for AVI files?

2) That should be Crop(30,0,-30,<b>0</b>). No negative sign required for zeroes.

1) Not always. Depends heavily on what the codec is:

[DirectShowSource] can read most formats which Media Player can play, including MPEG, MP3, and some QuickTime files, as well as AVI files that AVISource doesn't support (like DV type 1, or files using DirectShow-only codecs).

2) He said he made an adjustment to this and it still didn't work?

[trythil]

If you have ffdshow installed, it can be configured to decode Motion JPEG video, and does a reasonably good job at it. Go into the ffdshow video encoder configuration screen, then to Codecs, and look for the MJPG FourCC.

If that's the only DirectShow MJPEG decoder you have, make sure that it's not set to "disabled". If it is, set it to "libavcodec". Save settings, restart VirtualDubMod, and see if that does the trick.

If it isn't the only such decoder you have, and you'd like to use another decoder, please provide a list of those decoders. As you said, you reinstalled AMVapp, so I'm betting it's a codec configuration issue.

[NeoQuixotic]

I have an S3 IS myself and I can open the AVIs just fine using AVISource. I use the PICVideo M-JPEG codec for encoding and decoding.

I did find one thing interesting. Depending on if I use AVISource or DirectShowSource, Vdub reports different colorspaces.

YV12 with AVISource
YUY2 with DirectShowSource

[Qyot27]

If you have ffdshow installed, it can be configured to decode Motion JPEG video, and does a reasonably good job at it. Go into the ffdshow video encoder configuration screen, then to Codecs, and look for the MJPG FourCC.

Note: newer versions of ffdshow-tryouts use 'VFW configuration' instead of 'video encoder configuration' - at least, the 2007.04.23 build uses it, and I'd assume that the 2007.06.03 build (rev1237) does as well.

[Bauzi]

Shouldn´t be crop always be a multiple of 4 ? I think I read this somewhere.

1) Shouldn't you be using AVISource() for AVI files?

[Tab.]

Shouldn´t be crop always be a multiple of 4 ?

Your resolution should probably be a multiple of 8, since DCT-based codecs break the image down into 8x8 blocks. I know most codecs have a way of dealing with non-mod-8 sizes, but it's probably best to make sure your video is mod 8 anyway :/

[CrackTheSky]

2) That should be Crop(30,0,-30,0). No negative sign required for zeroes.

Shouldn´t be crop always be a multiple of 4 ?

Your resolution should probably be a multiple of 8, since DCT-based codecs break the image down into 8x8 blocks. I know most codecs have a way of dealing with non-mod-8 sizes, but it's probably best to make sure your video is mod 8 anyway :/

The crop is not the problem, as commenting it out didn't help at all.

If that's the only DirectShow MJPEG decoder you have, make sure that it's not set to "disabled". If it is, set it to "libavcodec". Save settings, restart VirtualDubMod, and see if that does the trick.

Oh hey, what do you know? That worked! Thanks a bunch trythil, I owe you some hardcore buttsex at AWA.

[Tab.]

The crop is not the problem, as commenting it out didn't help at all.

Well no, it wouldn't be a problem perse. Modern codecs have mechanisms to deal with this. It's simply not advised.