The alpha channel is transparent or semi transparent pixels in the video file.
This is also known as ''Pre Keyed''
To take advantage of this your device/software needs to support Alpha channels.
Most professional software for playing and mixing video will support alpha channel.
Advantages:
This gives you much smoother blending when more than one layer of content is played/mixed over the top of another. You don’t need to set a transparent colour (Chroma keying).
Disadvantages:
File sizes can be large. Sometimes playback is jumpy on some machines, if you experiencing this this problem with files downloaded from Visual Mash and not in a position to upgrade your system then we recommend downloading the video file without Alpha Channel or converting the file to a different format.
Some situations you may not like the semi transparent pixels, If this is the case you can still use chroma keying and manually set the required blending.
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