In their developer documents, they say they support the following:
• Containers: MP4/CENC, WebM, MPEG-DASH, SmoothStreaming
However, MPEG-DASH and SmoothStreaming are streaming protocols that allow for various containers. The MPEG-DASH spec allows for MPEG2-TS chunks, but I don't see any information regarding supported container formats inside of a DASH manifest.
The default Chromecast video formats are MP4 and WebM. It also supports MPEG-DASH, Smooth Streaming, and HTTP Live Streaming (HLS) video files. All other video formats are unsupported.
Drag-and-drop a video file type Chrome supports — like an MP4 file — into the Chrome browser window and Chrome can play that video file back in a tab. Click the Google Cast extension icon, select your Chromecast, and you can Chromecast the current tab — and the video playing in it.
I think when it says "MP4/CENC", it is implies it supports MP4 containers within an MPEG-DASH manifest. I don't think TS is supported... so no mention of HLS either of course.
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