Played with no Sound

Problem

Some sources can be played, with only display but no sound output.

You can try to specify the audiosink manually. The following code block provides an example.

 gst-play-1.0 --flags=3 test.mp4 --audiosink="alsasink device=hw:0,0"

It is recommended to make sure the video can be played properly using basic testing tools such as aplay and then use GStreamer to debug.