<div dir="ltr">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 </div>