Hello, here are a few notes about your question.
1. Are your instructions incomplete? According to the normal command specification it should be completed as ST<{“cmd_code”: “set_video_play”, “type”: “system”, “x”:0, “y”:0, “video”: “video.mp4”}>ET (only for example)
2. The video is played in silent mode. If you need to play with sound, please split the audio file in the video and add it to the project, then use the set_audio command to play the corresponding audio.
3. Playing audio requires an external playback device.
If you have any other questions, please contact me.
Best Regards.
Zhang Su
WhatsApp: 008615510602607
Email: zhangsu@stone-hmi.com