GStreamer 的 textoverlay & timeoverlay

使用 textoverlay 顯示文字

$ gst-launch-1.0 -v videotestsrc ! textoverlay text="Room A" valignment=top halignment=left font-desc="Sans, 72" ! nvvideoconvert ! nveglglessink

使用 textoverlay 顯示字幕，timeoverlay 顯示時間

字幕檔

$ cat subtitles.srt 

 1

 00:00:03,000 --> 00:00:05,000

 Hello? (3-5s)

 2

 00:00:08,000 --> 00:00:13,000

 Yes, this is a subtitle. Don't

 you like it? (8-13s)

 3

 00:00:18,826 --> 00:01:02,886

 Uh? What are you talking about?

 I don't understand  (18-62s)

$ gst-launch-1.0 -v filesrc location=subtitles.srt ! subparse ! txt.   videotestsrc ! timeoverlay font-desc="Sans, 24" ! textoverlay name=txt shaded-background=yes font-desc="Sans, 24" ! nvvideoconvert ! nveglglessink