Encoding
From Wikanual
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Clip Bandwidth and end user bandwidth
The page http://www.interdubs.com/index.php?mensel=bw_capa can tell you for how many percent of INTERDUBS end users a clip will play right away. If you enter the bandwidth of a clip you get the percentage of clients that can watch the clip right away.
In general we recommend 1800 Kilobit / second.
For small file size and bandwidth you could alternatively consult this encoding quide over at Motionographer. The difference to our recommendation on this page is the fixed size to 640x480 and the lower bandwidth of 1300 Kb/s.
Settings
INTERDUBS can handle and transfer any file you like to upload.
All file types can be used. Windows media, still frames and Quicktime files will have extended functionality enabled.
Size
It is recommended to encode your clips with a larger pixel size than you might think. H264 does a fine job filling those pixels without any artefacts. It can be assumed that people have a screen size that is wider than 1000 pixels today. Going that wide is entirely possible and will usually yield good results.
In 98% of all cases it makes no sense to make the clip smaller than 500 pixels wide.
Video settings
Data Rate: Restrict to 1800 kbits/sec Compression Type: H.264 Frame Rate: current Key frames: Automatic
H.264 is widespread enough to assume that all potential clients have it. It can provide stunning video quality for relatively low bandwidth needs.
Audio settings
Audio Compression: AAC Bitrate: 256 kbps
If audio is critical to your work then you could consider to use uncompressed. CD quality audio uses 1411 kbits/sec. 1800 for video and 1411 for uncompressed audio will get you a file with a bit more than 3Mbit/s. Even a T1 line would only need to download twice the play length to play this. Most people in a pro environment will have more than that.
Fast start
Also makes sure to set:
Prepare for Internet Streaming
and set it to
Fast Start
Quicktime Export settings
Examples of the quicktime export screens:
iPhone
INTERDUBS can convert clips automatically into the proper iPhone format if it detects a device that requires this format.
If you like to encode clips for the iPhone yourself then you can use the setting
Movie to iPhone
in Quicktime Pro. You can disable INTERDUBS' automatic transcoding if you desire so.
iPad
INTERDUBS supports the iPad. Apple suggests the following video settings:
H.264 video up to 720p, 30 frames per second, Main Profile level 3.1 with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format
Pulldown
Material that originated on 24 fps and was converted to NTSC via the insertion of a pulldown can be compressed much better when the pulldown has been removed.
32none is a free tool that can do this step for you.
improve these settings if you like
These values on this pages are only guidelines. Feel free to optimize them along your needs. INTERDUBS can deal with any size and bitrate for your clips.
Sizes in Use
Currently these are common resolutions used in INTERDUBS:
| usage | resolution | aspect |
|---|---|---|
| 16.9% | 640x480 | 1.33 |
| 16.5% | 640x360 | 1.78 |
| 8.5% | 480x360 | 1.33 |
| 8.0% | 960x540 | 1.78 |
| 5.9% | 1280x720 | 1.78 |
| 5.6% | 720x486 | 1.48 |
| 4.7% | 320x240 | 1.33 |
| 3.5% | 720x405 | 1.78 |
| 3.3% | 720x406 | 1.77 |
| 2.9% | 800x450 | 1.78 |
| 1.7% | 720x480 | 1.50 |
| 1.6% | 1920x1080 | 1.78 |
| 1.6% | 480x270 | 1.78 |
| 1.4% | 720x540 | 1.33 |
| 1.2% | 854x480 | 1.78 |
| 0.9% | 720x404 | 1.78 |
| 0.9% | 768x432 | 1.78 |
| 0.8% | 648x486 | 1.33 |
| 0.6% | 864x486 | 1.78 |
| 0.6% | 720x576 | 1.25 |
| 0.4% | 480x272 | 1.76 |
| 0.4% | 320x180 | 1.78 |
| 0.3% | 400x300 | 1.33 |
