I have a music video I shot with my FS100. I want to upload it to youtube in the best quality I can. Here's my problem, I tried exporting in a few different settings. I tried a low bitrate of 8, max 10 VBR 2 pass. However even before uploadin its kinda blocky in dark parts of the video so I tried at a high bitrate of 32. No blockiness in the dark ares. When I upload to youtube its saying that the video is dark and asks me do I wanna fix. I choose no because when I chose yes it messed it up. Long story short the quality is terrible in 360p. How can I get it to look good without ppl having to chose to watch in 1080. Any suggestions

This is more of a question for you editing software, not camera. So what software are you using, these settings options are unfamiliar to me. In FCP I chose h.264 at 5000 kbps with native gamma and de-interlace set to on, preserve HD aspect ratio with letterbox if needed. Multi-pass with better motion adaption on (not best) and no anti-alias. These setting were suggested for vimeo, and I just use them for Youtube also.
These are the suggested setting for Youtube in Apple Compressor:
Name: YouTube sharing
Description: H.264 video at 8 Mbps with AAC 44.1kHz audio
File Extension: mov
Estimated size: 3.6 GB/hour of source
Audio Encoder
AAC, Stereo (L R), 44.100 kHz
Video Encoder
Format: QT
Width and Height: Up to 1280 x 720
Pixel aspect ratio: Default
Crop: None
Padding: Preserve source aspect ratio
(L: 0, T: 0, R: 0, B: 0)
Frame rate: (100% of source)
Frame Controls: Automatically selected: Off
Codec Type: H.264
Multi-pass: On, frame reorder: On
Pixel depth: 24
Spatial quality: 50
Min. Spatial quality: 50
Temporal quality: 50
Min. temporal quality: 50
Average data rate: 8 (Mbps)

Does it help?

Oh, and I hear these guys like square pixels to, so set that up also.

I am not an professional editor so if there is anything better someone else chime in!