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Just wanted to say thanks very much for all the information here. I was able to retrieve some footage of Santorini when it was raining because I experimented with the information above. Here's what I managed to get back from files that I hadn't been able to open for nearly 2 years:

Hi, I had a similar problem back in 2014. I had used an old build for my Canon 50D and the MLVs couldn't be processed past 1 frame. Having gone through these forums I have managed to figure out that the headers are bad but I have since sold my Canon 50D. I have only got one "donor" MLV file from the past which is 25fps 1920 x 1080 and that fixed one file that had the same settings. So I have only been able to fix one file out of the 12 I shot whilst on holiday in Santorini. I am therefore appealing to anyone to send through a random MLV file recorded with 1568 x 882 resolution and shot at 25 fps (precisely 25.048fps) with around 550 frames in duration. I would then only need the first 10MB of the MLV file so that I can replace the header in my corrupt files with the donor file.

I hope someone can help! Thanks, Luke

Here's a video test I've made using raw video at 1280 x 720 (getting around 21 frames at a time using a 7dayshop.com class 10 SD card) and a longer sequence of images at 960 x 540 (around 62 frames at  time). I haven't tried lower resolutions as yet.

https://vimeo.com/67002231

pavelpp. If you want to use totally free programs on a PC, you can use Gimp to do the raw conversions to a sequence of stills, such at BMP, TGA or JPGs
http://www.gimp.org/

You can then download Virtualdub and open the sequence of stills by clicking on the first still and it should load up the sequentially numbered stills as one video. Go to the Video option in the menu and change the frame rate to 24. In the same menu (Video), choose what compression you'd like to use and then save the file as an AVI.
http://www.virtualdub.org/

If using a Mac, just do the same thing with Gimp but use something like Quicktime Pro to open an image sequence and choose a frame rate of 24. Encode the file using the Quicktime Pro export options.