A poster frame is a static image taken from one frame of video to represent a video (like a video post) visually in various contexts such as a thumbnail or before the video is played.
You should include an explicit poster frame on your video posts to provide an image that is representative of what the video is about, since the first frame might not show much, or is blank.
Use the HTML5
poster attribute on the
<video> tag with a URL to the poster frame image like a JPEG.
- http://veganstraightedge.com/videos/2013/5/31/1/backyard-squirrel-buddy (updated 2015-12-13 with fallback
u-featuredintending to communicate the
.MP4video file and
u-photoas a fallback for cases when native video isn't supported.
Tantek Çelik supports explicit poster frames in his video posts since 2015-360 using an upgrade to the CASSIS
auto_link function that implements: Video with poster and Video with poster and hyperlink auto-linking syntaxes. Example:
- 2015-360: http://tantek.com/2015/360/t2/best-starwars-speak-droid
- manual POSSE tweet video: https://twitter.com/t/status/680897393814994944
Silos that support video posts with explicit poster frame selection:
In particular the following silos that support video posts DO NOT support poster frames: