> 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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