[FFmpeg-user] Combining two audio feeds from live rtsp sources into stereo is delayed

[Mark Umansky]

> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of Carl Eugen Hoyos
> Sent: Wednesday, October 29, 2014 12:30 PM
> To: ffmpeg-user at ffmpeg.org
> Subject: Re: [FFmpeg-user] Combining two audio feeds from live rtsp
> sources into stereo is delayed
> 
> Mark Umansky <umansky <at> torcrobotics.com> writes:
> 
> > > >   Duration: N/A, start: 0.040022, bitrate: N/A
> > >
> > > If no wallclock is shown as start time here, I don't think this can
> > > work at all.
> >
> > Do you mean actual real world time?
> 
> Yes.
> 
> > I'm not sure I follow.
> 
> If both streams contain a "real world" start time ("wallclock time") then
> FFmpeg should be able to synchronize them.
> If both start with "0" then I fear synchronization will even fail (sometimes) if
> FFmpeg were infinitely fast (which it is not).
> 
> It may of course be a bug that FFmpeg cannot read the actual starttime (that
> may be part of the stream), I don't know.
> 
> Please try to fix your mailer, Carl Eugen

Assuming I can't do anything to fix the start times, is there a way to delay input from one of the streams so I can attempt to adjust the delay manually? 

Thanks,
Mark