[maemo-developers] GStreamer: unable to have AMR-NB in 3GP-container?

[From: Oskar Welzl]

Hi,

I want to use GStreamer from the command line to resize videos
(potentially for MMS, but also mail). I'd like to get: 3GP container,
H.263 video codec, AMR-NB audio.

I got this far:

gst-launch-0.10  filesrc location="/home/user/MyDocs/.videos/Nokia_N900.mp4" ! decodebin2 name=all \
hantromp4mux filetype=1 name=muxer ! filesink location="/home/user/MyDocs/.videos/outfile.3gp" \
all. ! queue2 ! videoscale ! "video/x-raw-yuv, width=(int)176,height=(int)144" ! \
 videorate ! "video/x-raw-yuv, framerate=(fraction)15/1" ! dsph263enc !   muxer. 

Works.

Now try to add the audio like:

gst-launch-0.10  filesrc location="/home/user/MyDocs/.videos/Nokia_N900.mp4" ! decodebin2 name=all \
hantromp4mux filetype=1 name=muxer ! filesink location="/home/user/MyDocs/.videos/outfile.3gp" \
all. ! queue2 ! videoscale ! "video/x-raw-yuv, width=(int)176,height=(int)144" ! \
 videorate ! "video/x-raw-yuv, framerate=(fraction)15/1" ! dsph263enc !   muxer. \
all. ! queue2  ! audioconvert ! audioresample ! nokiaamrnbenc ! muxer. 

No audio in this file. I'm new to GStreamer in general, so I fooled
around a bit. To my surprise, what I found was that this works
beautifully:

gst-launch audiotestsrc num-buffers=100  ! decodebin2 name=all \
all. !   audioconvert ! audioresample !   nokiaamrnbenc  !  \
 hantromp4mux filetype=1 name=muxer ! filesink location=outfile.3gp

...and this works, too:

gst-launch filesrc location="/home/user/MyDocs/.videos/Nokia_N900.mp4"  ! decodebin2 name=all \
all. !   audioconvert ! audioresample !   nokiaamrnbenc  !  nokiaamrnbdec ! pulsesink


...while this does not:

gst-launch filesrc location="/home/user/MyDocs/.videos/Nokia_N900.mp4"  ! decodebin2 name=all \
all. !   audioconvert ! audioresample !   nokiaamrnbenc  !  \
 hantromp4mux filetype=1 name=muxer ! filesink location=outfile.3gp

This last version with spits out a couple of "dsp_thread: failed waiting
for events" messages for quite a while and then creates a container with
an invalid audio stream.

I might miss the obvious here - I only started to play with GStreamer
about a week ago. Any help appreciated!

Thx
Oskar