demuxing mp4 and queues

[Wudo Balmus]

Hello,
I'm trying to demux and playback an mp4 file with h.264 video and aac
audio. This pipeline works fine:

gst-launch-1.0 -v filesrc location=working.mp4 ! qtdemux name=a a. ! queue
! avdec_h264 ! videoconvert ! autovideosink a. ! queue ! avdec_aac !
autoaudiosink

However when the queues are removed, it hangs, nothing is played back:

gst-launch-1.0 -v filesrc location=working.mp4 ! qtdemux name=a a. !
avdec_h264 ! videoconvert ! autovideosink a. ! avdec_aac ! autoaudiosink

It works fine without a queue when I just try to playback video without
audio:

gst-launch-1.0 -v filesrc location=working.mp4 ! qtdemux name=a a. !
avdec_h264 ! videoconvert ! autovideosink

I'm trying to understand why queues are necessary in this scenario. Cannot
qtdemux just write data to video/audio decoder without the queues?

Best regards,
Wudo
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