[FFmpeg-user] HELP

Thu Oct 25 22:44:00 EEST 2018

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
(approx).

I try VLC without luck (between 1sec and 1.5sec)

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

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

Tél. : 514-597-6586 (1-141-6586)
Cell. : 514-895-6586

Le jeu. 25 oct. 2018, à 15 h 35, Paul B Mahol <onemda at gmail.com> a écrit :

> On 10/25/18, Erik Gaudin <erik.gaudin at cbc.ca> 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.
>
> How you measure latency?
>
> >
> > VLC, Latency issue.. it added 1 sec, and can't lower that value at all,
> > unless there is a command line i didn't find.
> >
> >
> >
> >
> >
> > Erik Gaudin
> > Chef de projet
> > Société Radio-Canada (SRC)
> > Ingénierie Médias (Montréal)
> >
> >
> > Project Leader
> > Canadian Broadcasting Corporation (CBC)
> > Media Engineering (Montreal)
> >
> >
> > Tél. : 514-597-6586 (1-141-6586)
> > Cell. : 514-895-6586
> >
> >
> > Le jeu. 25 oct. 2018, à 13 h 23, Paul B Mahol <onemda at gmail.com> a
> écrit :
> >
> >> On 10/25/18, Erik Gaudin <erik.gaudin at cbc.ca> wrote:
> >> > 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://@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)
> >> >
> >> > 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.
> >>
> >> Use something much more powerful like mpv.
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