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| Robastro |
| Posted: Feb 14 2010, 12:52 AM |
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Newbie
Group: Members
Posts: 1
Member No.: 27012
Joined: 13-February 10
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Hi,
I'm trying to convert an AVI from a Microsoft LifeCam Cinema HD,
which is in 1280x720 MJPG format, to another compression codec.
This works great on the 32-bit 1.8.8 release of vdub running under
XP Pro (32 bit), but when I try the same AVI on vdub 1.9.4 and higher
(including 1.9.8), the input file is rendered in green.
I'm trying to move everything over to a Windows 7x64 box, but the
1.8.8 x64 version wont decode mjpg input files (reports needing a VFW
codec.)
I can run vdub 1.8.8 (32-bit version) on the Win7x64 box, so have a
workaround, but thought I'd report this green rendering issue as I'd
prefer to run a 64 bit version of vdub if possible.
I can upload a test AVI if it would help.
Cheers and thanks for a superb program which I've been using for many
years in amateur astronomy - I would be "lost in space" without it! 
--
Rob
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| Placio74 |
| Posted: Feb 14 2010, 04:24 PM |
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VideoAudio
Group: Members
Posts: 1216
Member No.: 21485
Joined: 24-May 07
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What codec is used to decode?
Look at File information.
What about internal decoding (DV & MJPEG)?
Options > Preferences... > AVI > Prefer internal video decoders over installed third-party codecs (MJPEG and DV)
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VideoAudio.pl - Serwis o technologii wideo & audio |
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| phaeron |
| Posted: Feb 14 2010, 09:16 PM |
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Virtualdub Developer
Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02
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Are you running 1.9.4+ 32-bit or 64-bit? If you're running 64-bit, it may be having to use the internal codec when the 32-bit version doesn't, causing a difference. I received a bug report on the green decoding (perhaps from you) and need to look into it. Ordinarily I'd suspect a non-compliant MJPEG stream, but this one's a bit unusual as all of the general shapes appear to decode correctly.
Updated:
Found and fixed one possible cause. Please try this version:
http://www.virtualdub.org/beta/VirtualDub-....9.9-test10.zip
http://www.virtualdub.org/beta/VirtualDub-...est10-AMD64.zip
http://www.virtualdub.org/beta/VirtualDub-...9-test10-src.7z
This post has been edited by phaeron on Feb 21 2010, 06:24 AM |
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| jbellies |
| Posted: Aug 17 2010, 06:39 PM |
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Newbie
Group: Members
Posts: 8
Member No.: 20328
Joined: 29-November 06
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I'd like to confirm that I had the same green display (and render) problem with MJPG video from a Pentax K-x camera using 1.9.8 stable, under XP SP3. There was a tiny corner of full colour in the upper left hand corner. Upgrading to 1.9.9 stable solved the problem. Thank you for Virtual Dub and for this forum. |
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| oreillymj |
| Posted: Dec 21 2011, 01:04 PM |
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Newbie
Group: Members
Posts: 5
Member No.: 33862
Joined: 21-December 11
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Phaeron,
I e-mailed you about the problem with the green MJPEG video from Pentax cameras. That is now fixed, but I have another problem which I think I mailed you about also.
1080p MJPEG video cannot be opened in Virtualdub because it gives the following error.
Virtualdub cannot decode 4:2:2 Motion JPEG frames with image widths or heights that are not multiples of 16.
Both 1920 and 1080 are divisible by 16.
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| fccHandler |
| Posted: Dec 21 2011, 06:49 PM |
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Administrator n00b
Group: Moderators
Posts: 3961
Member No.: 280
Joined: 13-September 02
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1080 is not a multiple of 16. I know at least with MPEG-2, hi-def videos are encoded at 1920 x 1088 but the bottom 8 lines are not displayed. If I remember correctly though, JPEG macroblocks are 8 x 8 so I'm not sure why VirtualDub would require height and width to be multiples of 16...
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May the FOURCC be with you... |
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| phaeron |
| Posted: Dec 22 2011, 12:03 AM |
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Virtualdub Developer
Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02
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This is a hold-over from an older version of the internal MJPEG codec. It used to do color conversion per macroblock, which prevented it from reasonably handling odd-size blocks. The current implementation uses the blitter library and so doesn't have this problem, but the size check is still there and is probably unnecessary. If you can post a short sample clip, I should be able to fix this problem.
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| ale5000 |
| Posted: Dec 22 2011, 11:19 PM |
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Advanced Member
Group: Members
Posts: 1114
Member No.: 22180
Joined: 30-September 07
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Sample file (MJPEG.avi - 1.23 MB): http://www.multiupload.com/NC0V9PEHV5
Another thing, it say "VirtualDub cannot decode 4:2:2 Motion JPEG frames with image widths or heights that are not multiples of 16"
but according to MediaInfo it should be "4:4:4".
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New VirtualDub forum
VirtualDub AIO (All-in-One installer for VirtualDub and plugins)
Codec Toolbox RS (A tool to read/change merit of codecs and many other things)
Input plugins for VirtualDub / ACM codecs / VFW codecs |
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| fccHandler |
| Posted: Dec 23 2011, 04:58 AM |
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Administrator n00b
Group: Moderators
Posts: 3961
Member No.: 280
Joined: 13-September 02
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I've been studying the .avi posted by ale5000, and as far as I can tell it is neither 4:4:4 nor 4:2:2. I say it is 4:2:0. It has Horizontal and Vertical sampling factors of 2 for the Y component, and Horizontal and Vertical sampling factors of 1 for the Cb and Cr components. As I understand JPEG, this means that the Y is sampled twice (in both directions) for each Cb/Cr sample.
Just for fun, I used VirtualDub's hex editor to extract a single frame starting from offset 0x9136A with a length of 0x568F bytes, and uploaded it here:
http://fcchandler.home.comcast.net/boxxy.jpg
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May the FOURCC be with you... |
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| phaeron |
| Posted: Dec 23 2011, 07:42 AM |
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Virtualdub Developer
Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02
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Typo in error message, will fix.
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| oreillymj |
| Posted: Dec 25 2011, 11:48 PM |
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Newbie
Group: Members
Posts: 5
Member No.: 33862
Joined: 21-December 11
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Yes, I had divided 1080 by 16 before and got 67.5.
For some reason Calc.exe decided round the result.
I've uploaded a 1080p clip from a Pentax K5
http://www.multiupload.com/MCH2GWZT3H
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