Indeo Video IV50 on Windows 7 Fix
Running into unnecessary problems trying to play a movie encoded with the accursed IV50 codec? I sure did. Some of my AVI videos were encoded with the Ligos Indeo XP Video codec awhile back via Pinnacle Studio 8.12.7, and has since stirred up a fuss trying to let me access them in Windoze 7. After much scouring the search results and tinkering and testing stuff, I believe I finally have that gremlin drawn and quartered.
First and foremost, you will need the Ligos Indeo Legacy Package (IV31, IV32, IV41, IV50, YVU9), which I believe is freeware according to my source. It will install Indeo Video codecs for 3, 4, 5, and Indeo Raw (YVU9). The filesize should be about 2,068,266 bytes. You can get it at...
Indeo Codecs Legacy Package (IV31, IV32, IV41, IV50)
Once installed, incredibly enough (believe it or not) you may still run into problems opening your IV50 encoded video. Why? That's because the Indeo installer FAILED (tch! tch!) to register the dll on Windows 7! Is it Indeo's fault, or WINDOZE SEVEN's fault, or BOTH? Who knows? Who cares? OK, I do, but that's a debate for another time. Right now I am itching to share the solution for the good of all mankind.
So go ahead and click that round Microsoft thingy at the bottom leftmost part of your desktop. Then click on All Programs followed by Accessories. Look for Command Prompt and right-click on it. Then click on Run as administrator. Helloooo, are you paying attention there? There's a reason why it's ITALICIZED and BOLDED! I cannot stress enough how *VERY* important this Run as administrator priviledge is, which is a very common problem in Windows 7 with some programs. Ignore it for this instance, and you will be smacked with a pop-up window out of nowhere happily informing you that "... the codec was loaded but the call to DllRegisterServer failed with the error code 0x8000ffff".
Assuming that you had followed the given instructions right down to the letter, you should be idling at the command prompt right now. Go ahead and type in the following:
regsvr32 ir50_32.dll
Press your Enter key, and voila, *hopefully* your problem should be solved. I know it did mine. 
VirtualDubMod – Cannot Append Segment Solution
Just recently acquired a few VHS tapes from my Sifu on Lion Dances and Choy Lee Fut Kung Fu performances which I had offered to help transfer to DVD. Still have me good ol' Pinnacle Studio DC10+ Capture Card after all these years. Fired up Pinnacle Studio 8.1, captured at 640x480, outputted them using the Ligos Indeo XP Video 5.2 Codec to a 1/2 D1 352x480 AVI video, attempted to join some of the videos together via VirtualDubMod 1.5.10.2, and VOILA... I get the following attitude:
Cannot append segment blah blah blah: The segment has a different set of streams.
After various experimentations, and researching on the Internet, I am pleased to say that I have come up with a tried-and-tested solution. Here are the following steps, and let's call the two videos "Video X" and "Video Y". I know, some of you guys are thinking "Hey, why not 'Video A' and 'Video B', or 'Video 1' and 'Video 2'?" Well, because I am in an X and Y mood, so as far as I am concerned, it's Video X and Video Y. Thank you very much.
1. Fire up VirtualDubMod.
2. In the menu bar, click File, click Open video file, look for Video X and press the Open button.
3. In the menu bar, click Video, and make sure Direct Stream Copy is selected.
4. In the menu bar again, click Streams followed by Stream List. Right-click on the video entitled "Source: Input AVI file", and make sure Direct Stream Copy is selected too.
5. In the menu bar yet again, click Video, then Frame Rate, and select No change.
6. Then click File followed by Save As, assign your desired video output a name, and then click the Save button.
7. Repeat for Video Y.
7. Once both videos have been processed, they should join fine (as long as BOTH share the same frame rate!). 
