Scripting playback rate: // After the video is loaded and metadata event fires you can use these: Alternatively a fast key-frame-only codec could be used, such as Hap. Videos with more key-frames (or ideally all key-frames) and with less complex encoding (eg no B frames, CABAC disabled etc) will work better. Video encoding can also help the performance of a change in playback rate. This approach would work on all platforms. One safe alternative to adjusting rate is to pause the video and fast seek to simulate a change in playback rate. Using negative values isn’t generally recommended as it isn’t as well supported, but if you do have to use a negative rate then also try keeping the numbers small such as: -0.25, -0.5, -1.0Īudio also may or may not play when changing the playback rate - this depends on the platform (see table below). Increasing playback rate usually places more demand on the video decoder and also on the disk/network source, so these limit how high you can set the playback rate. Going up to 4.0 might be possible depending on your platform, machine specs and the codec used.

There are some platform differences for seeking behaviour: If the frame rate can not be determined (eg in some HLS media the frame rate returns zero) then you can still use the frame-based time methods by manually supplying the frame rate as an optional final parameter to the above methods: // After the video is loaded and metadata event fires you can use these: Get the highest frame number you can seek to (the same as durationFrames-1) Media that has a known constant frame rate can be seeked using frames: // After the video is loaded and metadata event fires you can use these:

TimeRange seekableRange = Helper.GetTimelineRange((), ()) Seek to the current 'live' time for a live stream This is only currently available on macOS, iOS, iPadOS and tvOS Seek to closest keyframe allowing keyframe to be either ahead, behind or on both sides of the desired time Seek to nearest keyframe at 24 seconds Get the ranges of time that can be seeked between All time operations are done in seconds using doubles: // After the video is loaded and metadata event fires you can use these:ĭouble duration = () ĭouble time = ()

Ffmpeg extract frames time range