>> +# NOTE: the REALAUDIO tests need to use the RA demuxer once
>> +# it is available
>
> Such a thing is going to be available when?

It already exists and works, at
https://github.com/kbara/libav/tree/rewrite_real , but it's undergoing
modification as I implement the RealMedia demuxer at
https://github.com/kbara/libav/tree/rewrite_realmedia - see
libavformat/rmdec.c for the bulk of it.

>> +FATE_SAMPLES_REALAUDIO-$(call DEMDEC, RM, RA_144) += fate-ra3-144
>> +fate-ra3-144: CMD = framecrc -i $(TARGET_SAMPLES)/realaudio/ra3.ra
>> +
>> +FATE_SAMPLES_REALAUDIO-$(call DEMDEC, RM, RA_288) += fate-ra4-28_8
>> +fate-ra4-28_8: CMD = framecrc -i $(TARGET_SAMPLES)/realaudio/ra4-28_8.ra
>
> The inconsistent naming is puzzling.  One sample is just ra3.ra, the other
> is ra-28_8.ra.  Also note the inconsistent use of _.

As Kostya said, ra3 can only contain one codec. I used to have an ra4
SIPR test, but removed it, as it turned out that SIPR support in
RealAudio 2.0 (.ra version 4) support is broken in the old
implementation, so I dropped it for now.

The use of _ is common;
http://wiki.multimedia.cx/index.php?title=RealAudio_28.8 mentions that
the FOURCC for it is '28_8'.
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