[FFmpeg-user] m4a won't play on Alexa

Evert Vorster evorster at gmail.com
Wed Jul 12 11:00:20 EEST 2017

Recode to mp3.

Nothing beats it for compatibility.

On 11 July 2017 at 00:12, sean darcy <seandarcy2 at gmail.com> wrote:

> I've got a bunch of sonatas I've uploaded to Amazon Music. They were
> originally opus files, but Amazon requires mp3 or m4a . ( Why ? Got me.)
> So I re-encoded the opus files:
> ffmpeg -i sonata.opus -vn -c:a aac -b:a 128k sonata.m4a
> The m4a files play just fine on my laptop, even in the Amazon Music
> windows app, but not in Alexa.
> "Sorry, I am having trouble playing the music."
> In the Alexa forum I found the following helpful advice:
> Make sure you are not sending a content type header of video/mpg4 which
> would be wrong if this is an audio-only stream. Also, it could be that the
> encoding is incorrect, for example the moov element is not present in the
> stream, etc.
> Any suggestions on how to encode that's Alexa proof ?
> sean
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Evert Vorster
Isometrix Acquistion Superchief

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