I'm looking for a video converter which is able to use existing installed video codecs. There is a serious amount of converting programs using internal codecs, which is great, but this time it's not helpful. The program should run on Windows 7, and if possible, free.
My goal: I would like to edit videos where I will need to edit them in another program, but I would like to retain the original quality by using the Lagarith lossless codec and uncompressed PCM audio. I can't use the existing video because it wants an avi file, with no H.264 codec (I had installed the K-Lite codec pack and used Avidemux to convert the mp4 file container to avi, but then the application will crash after 50% loading progress). I want to avoid converting this video into a lossy format, unless it's perfectly safe to do so with certain settings. The final video is going to be a compressed video anyway, so I don't want to lose any quality before.
I have seen Sony Vegas is able to render videos using external codecs, but it's a way too much overkill, because it costs around 400$ and I don't want to edit it this way. Just a conversion. I have also visited quite a few other topics available here, but all these applications are using internal codecs. I have tested Handbrake, Media Coder, Avidemux, VirtualDub (unable to handle the avi after conversion from mp4 with Avidemux), TEncoder, XMedia Recode, WinFF and Super (built-in Lagarith codec, but can't convert without an error as well).
Thanks a lot in advance!