Feet and Leg Jitters

andrew · **Joined:** Wed Apr 07, 2010 4:33 am **Posts:** 468

Greenlaw wrote:

I copied the uncompressed version of the video to another computer and it's not playable there either.

Hello!

Which version of Windows Media Player and Windows OS do you have on that another computer? The thing is that under WinXP you can have outdated version of Windows Media Player which cann't play long video files. In this case we recommend to install XP codec pack (see http://www.xpcodecpack.com/).

If it is not helpfull, please inform us about configuration: version of OS, version of WMP.

Greenlaw · **Posted:** Tue Nov 23, 2010 9:50 am

The other computer is an HP tm2 Tablet PC, dual core, Windows 7 Professional with ATI Radeon HD 4550.

I have to be out for a bit, but will check on media player version when I get back. FWIW, I had no problem writing out playable videos with older versions of iPi DMC.

When I get back, I'll test on my old computer too, which was a quad core system with Vista Ultimate installed.

G.

Greenlaw · **Posted:** Tue Nov 23, 2010 10:54 am

Okay, I'm back. The version of Windows Media Player on the quad core system is 12.0.7600.16385, and the tablet PC has 12.0.7600.16667. I don't normally use WMP, preferring MPC or VLC which between the two normally play more formats with better framerates than WMP or QT Player can. Both computers are running on Windows 7 Professional.

I think I still have an old installer for iPi DMC somewhere. I could remove the current version on my main computer and install the old one, and see if the video from the old version of DMC plays differently.

G.

Greenlaw · **Posted:** Tue Nov 23, 2010 11:50 am

Hi,

I tried installing the x64 and x32 versions of the K-Lite codec pack to see if this would help. I had K-Lite on my old computer but avoided installing it on the new one because some Sony Vegas users had reported problems when using it with Vegas Pro 10, but I decided I could always remove it if I had problems. Anyway, installing the codec pack did no fix the iPi DMC video export problem.

One more detail: when I try to play the video with Windows Media Player on the quad core I get the following error:

Windows Media Player C00D11B1
Windows Media Player can't play the file.

BTW, I am able to play videos from other applications, compressed or uncompressed, with WMP, MPC, VLC, or QTP, so I think this is a iPi DMC export issue and not a codec or Windows system issue.

Update: My wife just tried playing the iPi DMC exports on her computer (also a quad core running on Windows 7 Professional with a GTX 260 installed,) and she cannot play the videos either. She tried playing the files using WMP, Divx player, and MPC.

Hope this helps.

G.

Greenlaw · **Posted:** Tue Nov 23, 2010 12:51 pm

More info the the export video problem I'm having: I removed the current version of iPi DMC and installed version 1.0.0.107 from last month. This seems to be the earliest version I still have, and I can't play the video exported from this version. (Auto updating back up to x.111 now.)

The version where I know I had success was when I did the sword video, which would have been last July. I'll see if I can find an even older version of the software here.

I looked on my old computer (the Vista system where I probably did the sword test,) but found that I had already removed iPi DMC from that system.

Could this be an iPi DMC + Windows 7 compatibility issue? I'm just wondering because my old computer where I exported sword test from has Vista Ultimate installed.

G.

Greenlaw · **Posted:** Tue Nov 23, 2010 1:12 pm

Okay, I wasn't getting anywhere so I decided to look at the problem a different way.

This time I loaded a different scene (my calibration scene) and export a video. I selected a shorter segment to save time. The video from this file played fine. My first though was that this worked because my video settings for the background video might have been different (different compression level or no compression?), or it worked because I selected a shorter segment. I'm pretty sure I didn't mess with the video settings, so it's probably the second.

Then I reloaded the 'problem' scene, but this time I selected a much shorter range of frames. This time the video exported correctly and is playable with all of my video players.

Just to be sure, I reset the length back to the longer region of interest, and exported again. Again, the result was a corrupted video file. One visual difference I see is that the shorter video files have a picture icon, but the longer one has a generic video icon. This seems to suggest that the longer file is not closing properly when iPi DMC finishes writing it.

Is there a limit to the length of video that iPi DMC can export? The longer, unsuccessful video is 2530 frames long and the shorter successful video is only 371 frames.

Thanks in advance for your help.

G.

Greenlaw · **Posted:** Tue Nov 23, 2010 1:23 pm

Okay, results from one more series of tests:

Export Video that was 2500 frames long (30 frames shorter): Corrupted.
Export Video that was 2000 frames long: Corrupted.
Export Video that was 1000 frames long: Playable

All test videos were exported using the Uncompressed setting. I'll have to check how long that sword test video was; my guess is that it was 1000 or shorter.

G.

Edit: Yes, the sword video is only 390 frames long. I just completed another test using a range of 1500 frames, and the video is playable. I'll update this post again when I learn what the threshold is.

Edit 2: The threshold appears to be somewhere between 1725 - 1775 frames. I have to go out again but when I have time, I'll try to nail this number down more precisely.

andrew · **Joined:** Wed Apr 07, 2010 4:33 am **Posts:** 468

Greenlaw, please forgive me!

I didn't read post carefully thus not guess that the problem is not with recorded video by iPiRecorder but with exported video by iPiStudio.

It is known issue with export of video from iPiStudio. The thing is that iPiStudio uses standard windows API to write AVI file and this API does not support AVI files larger than 2Gb. Meanwhile iPiRecorder has build-in native implementation of AVI file writer.

We didn't imagine that someone will need to export such large video... Now it's clear that we need to improve video export in iPiStudio.

Right now you can export video by portions and merge them together using VirtualDub or use some compression (e.g. H264).

Beg my pardon again!

Greenlaw · **Posted:** Tue Nov 23, 2010 5:47 pm

No problem. Once I realized that shorter videos worked, I rendered my movie as two separate clips for stitching later in Vegas. :)

BTW, the threshold for exporting a playable video is 1746 frames (on my system anyways.) At 1747 frames, the result is a corrupted video. I'm sure the actual frame count will vary depending on the video clip and level of compression.

I just looked at the file size of this video and, you're right, it's 1.99 GB! :)

G.

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