[FFmpeg-user] Unable to convert to GSM

[Moritz Barsnick]

On Sat, Feb 16, 2019 at 06:10:44 -0500, Ted Park wrote:

> So I think we can assume gsm wasn’t a format that was implemented in
> avformat at that point.

That's what ffmpeg did indeed complain about - the format (as given
with "-f gsm"), not the codec.

We can actually check that it wasn't implemented. It was introduced
with this commit which first went into ffmpeg 3.1:

https://github.com/FFmpeg/FFmpeg/commit/b0c026a27f9498b8f118684a2830ca7df7eae374

Moritz