audio-G726-32-1: could not find codec parameters

Now, I have tried telling ffmpeg that it's a g726 encoded file, but it still
fails. Is there something special about this file

Not really. The audio stream uses the RTP payload format "audio/G726-32", which is G.726 audio encoded at a sampling frequency of 8000 Hz, with 4 bits-per-sample. Note that these 4-bit samples are packed into bytes in 'little endian' order. See RFC 3551, section 4.5.4. The resulting file contains (exactly) the contents of the RTP stream, and so is in the same format.


? Should I be using a
particular ffmpeg codec? Which one?

I'm sorry, I can't help you here. I'm not an expert on "ffmpeg" (or any other decoder software).
--

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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