I'm doing some rendering in Vegas Pro and notice that if I select MainConcept (which gives me an HTML5 compatible MP4) the audio tab only has options for the bit rate and the sample rate. Before rendering, I combined both left and right channels on the timeline, but once rendered, the video file has two audio channels.
This is normally not a problem, but in this case, the audio is only voice and I'm concerned about file size, so if I could render with a mono channel, I would be able to get a higher bit rate for audio quality, but keep the file size small.
What Vegas is doing is taking the single channel audio from the timeline, duplicating it, setting a left and right channel, then cuts the set bitrate in half for each channel. So if I want 96kbps mono, I actually end up with stereo, 48kbps on each channel.
Is this an inherent issue with MainConcept file types? I notice that with others I can actually select mono in the audio tab, but not with MainConcept. I thought I read a short half sentence saying as much on some forum, but not sure.
If there is a way to have an HTML5 compatible MP4 with mono audio, please tell me how.