[FFmpeg-user] Unable to convert to GSM

Ted Park kumowoon1025 at gmail.com
Sat Feb 16 13:10:44 EET 2019

> libavformat version has indeed changed.
> Although I’m honestly not sure how this affects what I was attempting to do.
> Is it possible that the “Lavc57.64.101” encoder was missing. Because of which this was happening ?

Probably not, both outputs showed that ffmpeg was configured with —enable-libgsm. Before you updated, the output on your ubuntu machine was saying

> subprocess output: b"[NULL @ 0x17e3f20] Requested output format 'gsm' is not a suitable output format”

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

By the way is that the version on apt?

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