Now the question - is it a codec story?
Yes, it is. The file not playing properly in Media Player is a clear sign.
If so, what codec do you reckon I need?
If you don't know, we can't know. Your whole description sounds like the typical "out of spec MP4 derivative from a crappy cheap camera wrapped in an AVI container" scenario. All the conversion did is probably unpack the MP4 stream without actually re-encoding it properly...
Thanks for your help Mylenium,
I wouldn't call it "a crappy cheap camera" - Canon EOS 70D, and it always worked fine on all the other computers. So I'm just wondering what that newly installed After Effect is missing.
The thing is - I don't know much about codecs (I only know such thing exists. Period.)
If you don't know, we can't know.
So that stays a problem.. Is there a way to find out what that missing codec is?
Thanks in advance
Doesn't that camera make h.264 files? You might need quicktime.
Ohhhh sorry, my bad - the video file doesn't come from the camera. It was recorded from the screen through Camtasia and I saved it in avi directly.
Thank you Dave for your answer!
You have to set up Camtasia to recored in a certain codec. You can find out what you used. That will help.
Camtasia might be using its own proprietary codec. You'll need to check your Camtasia settings.
I can't remember if Camtasia gave an option to convert files after you recorded them or not.
Thank you both Dave & Szalam!
I'll check that!