Some podcasts, such as Moneybox, are at 48kbit/s . It is adequate for mono
speech programmes, especially if it is to be listened to on a cheap mp3
player
while walking. Once it has been compressed to 48kbit/s, any higher
frequency
information is gone. It cannot be retrieved by converting at a higher bit
rate.
Also the conversion to .mp3 at 128kbit/s takes a lot longer than the
--radiomode flashaaclow .m4a download at 48kbit/s.
It is difficult to see what parameters get_iplayer passes to ffmpeg. As far
as I have
been aware, when tv programmes are converted (by default) from .flv to .mp4,
the .mp4 bit rate is similar to the .flv bit rate.
This is the first time I have used get_iplayer for a radio programme, so I
cannot
say whether the increase of bit rate in --aactomp3 is a new problem.
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