The recommended file format is .flv Flash (FLV H246 & AAC).
The recommended settings for Flash PC/Mac & Iphone/Ipad streaming are:
Video Settings
Video Codec: H264 ( High or Main Profile)
Max bitrate: 500-600kbps for SD |1mbits for 720p | 1.5-2 mbits for 1080p
Rate Control Mode: VBR
Key Frames Settings: 60
Audio Settings
Audio Codec: AAC (AAC Profile: LC)
Audio Sample Rate: 48000 Hz
Audio bitrate: 60 - 128kbps
NOTE: VP6 or H263 (FLV1) codecs are not recommended!
Q1: How to encode my videos to the right .flv (flash) format?
A1: Use our Windows based Encoder & Uploader App to encode your videos locally on your computer before uploading them to us. In that case you are assured that there will be no incompatibilities.
Read more about the Encoder & Uploader App here
Q2: What are the other file formats I can upload that are supported?
A2: .asf ,.asx, .avi, .3gp, .3g2, .avi, .f4v ,.flv, .m2v, .m4v, .mkv, .mov, .mp4, .mpeg, .mpg, .mpg2, .vob, .wmv, .xvid