A codec is the format in which your video will be encoded. Different codecs have different features and varying quality. For best results, we recommend using H.264 (sometimes referred to as MP4) (in descending order of preference): H.264, VC-1, DivX, WMV9, progressive MPEG-2
640x480 for standard definition 4:3 video, 840x480 for standard definition 16:9 video, and 1280x720 or 1920x1080 for high definition.
This setting controls both the visual quality of the video and how big the file will be. In most video editors, this is done in terms of kilobits per second (kbits/sec or kbps). 1.2 to 4 Mbps (depends on the codec and the resolution)
If there is an option for keyframes, use the same value you used for framerate. 25 fps (preferred)
2-pass encoding, progressive (not interlaced, this is very important). If you shoot in DV format, this is an especially important. If you do not deinterlace, you will often get weird-looking horizontal lines in your video.
If you have the option to control the pixel aspect ratio (not display aspect ratio) make sure it's set to "1:1" or "1.00", also sometimes called "square pixels."
While we like MP4 the best, we will generally accept any of the following formats: 3gp, avi, divx, m4v, mkv, mov, mp4, mpeg, mpg, ogg, wmv…
If you respect the above guidelines, your filesize normally won't exceed 2 Gb for 100 minutes. How even if the filesize is unlimited for motionmaker and Official User, some browser usually can't handle anything larger than 2 Gb. Anyway if you want to upload more than 2Gb video use our classic upload page. Make sure your connection to the Internet is rock solid. Try not to have too much going on in other tabs or browsers as long files tend to get hung up if there is too much other activity. Please turn off any virus protection or ad block, or energy saving settings!
Codec (in descending order of preference): AAC, MP3, WMA9, MPEG Layer 2
256 Kbps AAC or 320 Kbps stereo MP3 (ideal), 128 Kbps stereo AAC or 192 Kbps stereo MP3 (minimum); 44100Hz