[Libav-user] problems using libav via MPD for rtsp stream

[KeithG]

I have been using ffmpeg on this RPi based audio appliance for a while. I
recently tried to add an rtsp stream to mpd whichuses libav to play the
stream. When I do so I get an error from MPD:

Jul 28 08:43 : exception: Failed to decode rtsp://
wowza.radia.cz:1935/CRo/DDur.stream; Protocol not found
Jul 28 08:43 : player: played "rtsp://wowza.radia.cz:1935/CRo/DDur.stream"
Jul 28 08:43 : exception: Failed to decode rtsp://
wowza.radia.cz:1935/CRo/DDur.stream; Protocol not found
Jul 28 08:43 : exception: Failed to decode rtsp://
wowza.radia.cz:1935/CRo/DDur.stream; Protocol not found
Jul 28 08:43 : player: played "rtsp://wowza.radia.cz:1935/CRo/DDur.stream"

When I use ffmpeg from the cli it works fine:
#  ffmpeg -rtsp_transport tcp -i rtsp://wowza.radia.cz:1935/CRo/DDur.stream
-f alsa hw:1,0
ffmpeg version n4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static
--disable-stripping --enable-avisynth --enable-fontconfig --enable-gmp
--enable-gnutls --enable-gpl --enable-ladspa --enable-libass
--enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype
--enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack
--enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb
--enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus
--enable-libpulse --enable-libsoxr --enable-libspeex --enable-libsrt
--enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264
--enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid
--enable-omx --enable-shared --enable-version3 --host-cflags='"-fPIC"'
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, rtsp, from 'rtsp://wowza.radia.cz:1935/CRo/DDur.stream':
  Metadata:
    title           : DDur.stream
  Duration: N/A, start: 0.093016, bitrate: N/A
    Stream #0:0: Audio: aac (HE-AAC), 44100 Hz, stereo, fltp
Stream mapping:
  Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, alsa, to 'hw:1,0':
  Metadata:
    title           : DDur.stream
    encoder         : Lavf58.29.100
    Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
    Metadata:
      encoder         : Lavc58.54.100 pcm_s16le
size=N/A time=00:00:16.85 bitrate=N/A speed=0.988x

Do I need to specify something when sent from MPD? Can it be that the flag
"-rtsp_transport tcp" is needed for an immediate connection? If I omit
this, it will connect, it just takes it a bit of time to figure out that
udp does not work and then falls back on tcp.

Thanks!
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