[FFmpeg-user] Changing the input of a live stream on the fly

Roger Pack rogerdpack2 at gmail.com
Thu Jul 9 18:28:13 CEST 2015

I think you could have two incoming streams (one being the pause
image), however I don't believe a filter exists that lets you
dynamically switch.  Would be interesting to write one and contribute
it back though!

On 7/6/15, Michael Pastore <mpastore at accela.com> wrote:
> We are looking into using FFMPEG as a replacement for Microsoft Expression
> Encoder for live streaming. It seems FFMPEG can almost do everything we
> need, except that Expression lets you easily switch input sources on the fly
> for a live stream. I haven't found a way to do the same thing in FFMPEG.
> We want to stream live audio over a static, looping video. The stream
> outputs to an IIS Smooth Streaming publishing point. We are able to do this
> with the following command:
> ffmpeg.exe -y -i "<looping video.mp4>" -f dshow -i audio="<my audio device>"
> -movflags isml+frag_keyframe -c:a libvo_aacenc -c:v libx264 -pix_fmt yuv420p
> -vf scale=320:240 -b:v 16k -f ismv <output>
> Our problem is that the software needs to support a special feature. At any
> time, the person controlling the live stream can "pause" it. What this means
> is any person who views this stream in their browser will see, instead of
> the looping image file, an image saying something like "We will be right
> back". The user will also hear pause music, instead of the feed from the
> microphone. When they "resume" the live stream, then viewers will once again
> see the looping video file and hear the audio from the microphone.
> I found a thread from 2012 asking about dynamic overlays:
> (https://ffmpeg.org/pipermail/ffmpeg-user/2012-August/008703.html ). The
> replies suggest that this is not possible through the CLI, but is that still
> the case today? I could accomplish what I want if I was able to add an
> overlay to a live stream on the fly.
> Is there any way I can accomplish this goal, short of writing a custom
> filter? Thanks in advance!
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