Error when passing raw PCM through adder

[Andrew Nesbit]

Hello,

I've constructed the following pipeline to mix two raw PCM audio streams
together. The inputs and output are named pipes:

mkfifo input1 input2 output

gst-launch-1.0 \
  filesrc location=input1 \
    ! queue \
    ! audio/x-raw, channels=2, format=S16LE, rate=44100, layout=interleaved
\
    ! audioconvert \
    ! adder name=m \
    ! audio/x-raw, channels=2, format=S16LE, rate=44100, layout=interleaved
\
    ! filesink location=output \
  filesrc location=input2 \
    ! queue \
    ! audio/x-raw, channels=2, format=S16LE, rate=44100, layout=interleaved
\
    ! m.

where input1 and input2 are supplied with raw PCM by two FFmpeg processes,
and output is consumed by a third FFmpeg process.

On executing the above pipeline, although the audio seems to be processed
OK, the following error is repeated as long as the stream is running:

** (gst-launch-1.0:44): CRITICAL **: gst_audio_buffer_clip: assertion
'segment->format == GST_FORMAT_TIME || segment->format ==
GST_FORMAT_DEFAULT' failed

What is likely to be causing this, and what would be the best way to
address it?

Thank you,

Andrew
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