mp4 Encoding specs for streaming video hosting at GravityLab

We recommend Main Concept H.264 mp4. Encoding should be based on the single-pass Baseline profile, with frame reordering disabled. Keyframes are suggested every 5 seconds, ideally an even divisor of the chosen segment length.

mp4 encoding for iphone / ipad / android / html5 devices
Delivery Dimensions Frame Rate Total Bit Rate Video Bit Rate Audio Bit Rate Audio Sample Rate
Aspect Ratio 4:3          
Edge 360×270 1/2 source 112 kbps 85 kbps 32 kbps 16
3G (low) 360 x 270 29.97fps 314 kbps 250 kbps 64 kbps 32
3G (high) 360 x 270 29.97fps+ 514 kbps 450 kbps 64 kbps 32
WiFi 360×270 29.97fps+ 724kbps 660kbps 64kbps 44
             
Aspect Ratio 16×9          
Edge 400×224 1/2 source 112 kbps 85 kbps 32 kbps 16
3G (low) 400×224 29.97fps 314 kbps 250 kbps 64 kbps 32
3G (high) 400×224 29.97fps+ 514 kbps 450 kbps 64 kbps 32
WiFi 400×224 29.97fps+ 724kbps 660kbps 64kbps 44
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