Ow, yeah, I never would have guessed that, lol. No clue what to do about the audio/video sync issue, either.
Your welcome =o)
Simply put, bitrate is quality. How much data is being pushed per second. So increase that, you increase quality, but it takes more machine to handle, so it'll likely lag more. You'll have to play around a bit to get what you want, but you can get some pretty good quality HD video at 2-3000kbps, 1500kbps or so could still manage something worthwhile if you know what you're doing (from what I've seen ... I don't know what I'm doing XoD ). At 1366x768, I imagine the 1000 - 2000kbps range should suffice.
You could surely mess around with that command a bit to really better the end result, 'cause in all honesty, I didn't really do many tests, lol. You could go down to 24fps. You probably don't need 6 channel audio, if any at all. You can also play around with different encoding options and codecs to get better quality without raising the bitrate, and see what works best. Lots more info here:
http://www.ffmpeg.org/ffmpeg.html#SEC6
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