> How to display Close Caption on the screen ?
> When i open our internal stream with VLC, i can displayed Substitle. But
> can't find how to do it with ffplay.exe (windows)
> Here what i use to display the stream : ffplay
> udp://@220.127.116.11:1234 -analyzeduration
> I use the last argument for low latency.
> Here what appear in DOS when start FFPLAY with URL only :
> Input #0, mpegts, from 'udp://@18.104.22.168:5000':q= 0B f=0/0
> Duration: N/A, start: 86892.634178, bitrate: N/A
> Program 2672
> Stream #0:0[0xa72]: Video: hevc (Main) ( / 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) ( / 0x0011),
> 48000 Hz, stereo, fltp
> Stream #0:2[0xa74](fre): Audio: aac_latm (LC) ( / 0x0011),
> 48000 Hz, stereo, fltp
> In VLC, CC are in Flux # 3 (Flux 0 = video, Flux 1 & 2 Audio track)
> I try multiple argument ( like -sst) but nothing happen. Any idea ?
FFplay is very rudimentary player, it does not support subtitles or
caption out of box.
On 10/25/18, Erik Gaudin <[hidden email]> wrote:
> In FFPLAY, there is a hot-key to switch from one substitle to the other.
> When i use it, it seem to do somethin (i notice in the DOS windows the
> function is receive... but no substitle.
> If the Substitle is not suported, why add this function ?
> I just try MPV, but the latency are not good compare to FFPLAY, and another
> application i tested.
At the bottom-right of the screen, i have the time appear here. The
computer who generate that time are in sync with the same NTP source as my
computer (using the same software).
When i play the clip from FFPLAY, VLC or the other sofware, i simply move
the screen to be near my time. Then i use snagit, and record the portion of
the screen that include both time (my PC, and the other PC who generate
it). I then open this clip on and editor, and calculate the delay between
the minute shift (record at 60 fps/sec).
Another test, to check the delay, are to open 3 player, and align the,.
Because i also have a crawling bar at the bottom (like CNN), when i allign
them, i can see who are the leader, and who is way behind everyone....
So the 100 ms sec delay i realy got, include all in the chain (network
delay, monitor delay, processing delay in the player,..).
We want to use that return for close-caption. So the "close-captionist" see
the "on-air" return of the show, but before the streamer, there is our CC
inserter device. So the close-captionnist type the new CC on our CC
software, and see the result on the computer screen, with 100ms delay
I try VLC without luck (between 1sec and 1.5sec)
Chef de projet
Société Radio-Canada (SRC)
Ingénierie Médias (Montréal)
Canadian Broadcasting Corporation (CBC)
Media Engineering (Montreal)