[FFmpeg-user] How to display Close Caption on the screen

[Erik Gaudin]

When i open our internal stream with VLC, i can displayed Substitle. But
can't find how to do it with ffplay.exe (windows)

ffplay udp://@239.255.123.1:1234 -analyzeduration 200
I use the last argument for low latency.

Here what appear in DOS when start FFPLAY with URL only :

Input #0, mpegts, from 'udp://@239.255.179.6:5000':q= 0B f=0/0
Duration: N/A, start: 86892.634178, bitrate: N/A
Program 2672
Stream #0:0[0xa72]: Video: hevc (Main) ([36][0][0][0] / 0x0024),
yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 59.94 fps, 59.94
tbr, 90k tbn, 59.94 tbc
Stream #0:1[0xa73](eng): Audio: aac_latm (LC) ([17][0][0][0] / 0x0011),
48000 Hz, stereo, fltp
Stream #0:2[0xa74](fre): Audio: aac_latm (LC) ([17][0][0][0] / 0x0011),
48000 Hz, stereo, fltp


In VLC, CC are in Flux # 3 (Flux 0 = video, Flux 1 & 2 Audio track)




Erik Gaudin
Chef de projet
Société Radio-Canada (SRC)
Ingénierie Médias (Montréal)


Project Leader
Canadian Broadcasting Corporation (CBC)
Media Engineering (Montreal)


Tél. : [phone] (1-141-6586)
Cell. : 514-895-6586
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[Micael Silva]

Post by Erik Gaudin
When i open our internal stream with VLC, i can displayed Substitle. But
can't find how to do it with ffplay.exe (windows)
I use the last argument for low latency.
Duration: N/A, start: 86892.634178, bitrate: N/A
Program 2672
Stream #0:0[0xa72]: Video: hevc (Main) ([36][0][0][0] / 0x0024),
yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 59.94 fps, 59.94
tbr, 90k tbn, 59.94 tbc
Stream #0:1[0xa73](eng): Audio: aac_latm (LC) ([17][0][0][0] / 0x0011),
48000 Hz, stereo, fltp
Stream #0:2[0xa74](fre): Audio: aac_latm (LC) ([17][0][0][0] / 0x0011),
48000 Hz, stereo, fltp
In VLC, CC are in Flux # 3 (Flux 0 = video, Flux 1 & 2 Audio track)
Erik Gaudin
Chef de projet
Société Radio-Canada (SRC)
Ingénierie Médias (Montréal)
Project Leader
Canadian Broadcasting Corporation (CBC)
Media Engineering (Montreal)
Tél. : [phone] (1-141-6586)
Cell. : 514-895-6586

FFmpeg and FFplay as far as I know only displays natively subtitle formats
that is pre-rendereded images such as DVD subtitles. Text formats like SRT,
ASS are shown using filters like subtile that renders the text using
libraries like libfreetype and then piping to display or file. Maybe there
is a way to get the text from closed captions and render it, but being
inside h264 frames like this case makes it a little tricky
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