[FFmpeg-user] Can ffpmeg output to stdout?

[Mike Brown]

On Sun, Sep 03, 2017 at 05:45:24PM +0200, Cley Faye wrote:
> 2017-09-03 17:16 GMT+02:00 Mike Brown <brown at mrvideo.vidiot.com>:
> 
> > ffmpeg version N-52837-g399f6ef Copyright (c) 2000-2013 the FFmpeg
> > developers
> >   built on May  7 2013 01:09:00 with gcc 4.7.3 (GCC)
> >
> 
> ???That's very, very old. But probably irrelevant to the problem at hand.???

Yes it is, but is the newest version that will run under XP 32bit.

> > Output #0, wav, to 'pipe:':
> >   Metadata:
> >     ISFT            : Lavf55.4.101
> >     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
> > 5.1(side), s16, 4608 kb/s
> > Stream mapping:
> >   Stream #0:1 -> #0:0 (ac3 -> pcm_s16le)
> > Press [q] to stop, [?] for help
> > size=  243306kB time=00:07:12.54 bitrate=4608.0kbits/s
> > video:0kB audio:243306kB subtitle:0 global headers:0kB muxing overhead
> > 0.000041%
> >
> >
> ???ffmpeg IS outputting to stdout as far as I can tell.???

Ya, that is what it looks like to me as well.  Thanks for confirming.

> > FFDCAENC --- experimental 'Coherent Acoustics' compressor.
> >
> > Input:   -
> > Output:  ABC-HD-DD51-AudioTest.dts
> > Bitrate: 1509 kbps
> >
> > Could not open or parse "-".
> > Error: Data chunk not found!
> >
> ???I believe your issue does not lay in ffmpeg but in ffdcaenc that can not
> open stdin, as it plainly say he can't parse "-". To check this, you could
> test by running the ffmpeg command by itself (which should just fill your
> terminal with clutter and beeps). You can also try piping from a file to
> ffdcaenc to make sure it work.
> 
> But as far as ffmpeg is concerned, it is outputting to stdout from that log.

Looks like I'll just write the script to have ffmpeg output to a file and
then have ffdcaenc read in that file.  I'll just delete the temp wave file.
That I know works.

Thanks for the confirmation.

MB
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