That was the best compromise I could do
H264 compression loses detail in dark scenes because of how it compresses video data. I tried with various options, and found using not enough bitrate gave me macroblocks and heavy banding in fade-in scenes. The only solution at my side was to use slowest settings and high bitrate:/ The source also had some grain, which comes hard on file-size..
Have you tried rendering with Zarax264? or were you using some other program? I'm just curious because I used it for my last amv, which is pretty dark too (literally), but I didn't have any issue's with it.
As for your amv, I think I would have enjoyed it more if I knew the lyrics because it's really emotional and all, and I just found my self lost, but at the same time I did like your editing. The transactions, and the effects you added, if you did add them, or it was in the source were well done. I just felt the scenes were dragged out a bit longer than needed. There was this one clip that lasted roughly around 20 seconds or so.. the one where someone places a hand over someone elses hand... forgive me, I suck at this.
But, I would say it was nicely put together, and I'm sure there is audience out there that would enjoy this. All in all, my only complaint would be the length of the scenes, but other than that, I don't see anything wrong with it. Good job.