You need to be able to say, this animation style causes strangeness and performance impacts. In my experience, you really need to work with designers who are willing to consider the technical impacts of design choices within the browser. WebM is a more restricted mkv container with a VP8 OR VP9 video codec and vorbis or opus audio codec. To add some confusion WebM is actually a hybrid. I believe mkv is currently the only reasonably popular container format that can usually play whatever audio/video is inside (mostly because only "advanced" players can even read it). Hopefully some of these assumptions will disappear over time. This reality is starting to break with h265 encoded video in an mp4 container. Most simple players will expect mp4 to contain h264/AAC. However the reality is that most non-smart video players will freak out at this kind of file. You can even ask ffmpeg to do it - it will happily oblige (and ffplay will play it). In theory there is nothing stopping you from making an mp4 with vp8 video and vorbis audio. These are the parts of the file that can be patent encumbered. h264, h265 (HEVC), vp8, vp9, ProRes and many others. The video streams are encoded using a video codec - e.g. In fact if you view an mp4 file at this level it reads like binary XML with 4 byte tag names. It groups together metadata about the file as well as the audio, video and possibly subtitle streams. A small note on a common misconception - the mp4 format is not something that is patented - that's h264.īroadly speaking video files are first a container (e.g.
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