在智能媒体服务为什么有的转场他不支持？

在智能媒体服务为什么有的转场他不支持？{"Version":1,"SdkVersion":"3.14.2","SubtitleTracks":[{"SubtitleTrackClips":[],"Count":0,"Id":4}],"VideoTracks":[{"VideoTrackClips":[{"Type":"Video","MediaURL":"https://hrjtest.oss-cn-shanghai.aliyuncs.com/official/you/resources/0cbe003f-e50e-4528-8c51-91243e1657bd.mp4","TimelineIn":0,"TimelineOut":14,"AdaptMode":"Contain","TrackId":0,"Id":1,"In":0,"Out":14,"Effects":[{"Type":"Background","SubType":"Blur","Radius":0.1},{"Type":"Volume","Gain":0.1}]},{"Type":"Video","MediaURL":"https://hrjtest.oss-cn-shanghai.aliyuncs.com/official/you/resources/e28ba33b-286f-412f-80eb-3f178fe4f370.mp4","TimelineIn":14,"TimelineOut":27.834,"AdaptMode":"Contain","TrackId":0,"Id":2,"In":0,"Out":13.834,"Effects":[{"Type":"Background","SubType":"Blur","Radius":0.1},{"Type":"Volume","Gain":0.1},{"ExtParams":"effect=bowTieVertical","Duration":0.5,"SubType":"bowTieVertical","Type":"Transition","From":1,"Id":3}]}],"Id":0,"Count":2}],"AudioTracks":[{"AudioTrackClips":[],"Count":0,"Id":3}],"From":"websdk","FECanvas":{"Width":1080,"Height":1920}}