I don't know if it's what OP meant, but I'm imaging starting at the 50% mark, then jumping forward or back 25%, then jumping forward or back 12.5% etc, until you've zeroed in on the nugget of content in the sea of noise.

Might make a good browser plugin. Binary search, but for video. Tweaking the exact ratios might be an interesting problem. I'm thinking (no evidence!) that 30% for a forward jump and 15% for a backward jump might work better. Large jumps forward until you hit something interesting, then small jumps back to find the start.