Hope this post isn't too long for a first post -- I have a ton of questions but am pretty excited about the prospects of starting to use Wowza.
Currently my site hosts H264-encoded MP4 files which people watch using JW Media Player (via progressive download). The files are hosted on Amazon S3. I'm investigating switching to a true-streaming method of delivering content using EC2+Wowza, but I'm trying to understand how bandwidth utilization is measured and whether or not we can reasonably expect Wowza to be a good solution for us.
Right now when a user wants to watch a video, the entire video (most are between 50 and 150mb) will load. Though they can scrub "ahead" on the timeline, they can only do this based on what they've downloaded, and can't click to a point that hasn't been downloaded yet. For our users, who often watch a video multiple times, this is a bit of an inefficiency in our downloading as it requires multiple full downloads from Amazon S3, and it also presents a challenge to users who have slower connections and can't download full videos quickly.
In making the switch to EC2+Wowza+true streaming, I'd like to figure out how much data is actually downloaded (and how much EC2 will charge us for) when a user begins streaming a video. For example, if a user clicks the "10min" mark on the timeline (for example, in a 45minute video) and it begins playing, will it download just the content that the user watches, starting at minute 10 and ending whenever they close the player, or will it download the entire video?
Additionally, are there any specific ways that H264 files need to be encoded to be supported? I had been using Mediacoder as a frontend to Mencoder to transcode our files into H264 (currently H264+HE-AAC though we'd like to use HE-AACv2 in the future), but we haven't been including hint tracks -- I can't tell if this is a necessity or not.
Sorry for the beginner questions, but I'm really excited about the possibility of running Wowza as a better solution for video hosting for our site. Are there any reasonable benchmarks I can look at as well, in terms of # users per instance, and what sort of instances are recommended? Our streams range from about 100kb/s (60+48) to 250kb/s (202+48) and I'd like to figure out how many concurrent connections can realistically be served on the various instances.