I've been building a skill that plays a lot of audio files via the AudioPlayer API from an S3 bucket.
I've encoded these files to M4A/AAC using ffmpeg. Most play back fine,but I'm have strange problems with the two longest ones. Long tale short, they don't seem to play back on first-generation devices, or throwing the following error and failing silently on the devices.{ "message": "GStreamer encountered a general stream error.","type": "MEDIA_ERROR_INTERNAL_DEVICE_ERROR" }
Some googling propose could be a MIME header issue. I've ensured that their `Content-Type` is set to `audio/m4a` in their S3 metadata.
Note that this only happens on first-gen devices. All other Echoes play the files fine, as expected.
The files are here:https://irfs-the-unfortunates.s3.amazonaws.com/audio/extras/advance-guard.m4ahttps://irfs-the-unfortunates.s3.amazonaws.com/audio/extras/making_of_mixed.m4aI've tried re-encoding the files at various samplerate and bitrates. I've also tried re-encoding the files as MP3, or which works on the first-gen devices but fails on the present.
I've been following the guidance at the following links:https://developer.amazon.com/docs/custom-skills/audioplayer-interface-reference.htmlhttps://developer.amazon.com/docs/alexa-voice-service/recommended-media-support.html#audio-codecsDoes anyone have (or can link me to) definitive specs for which formats play on which devices,and what encoding settings I can use to encode files that AudioPlayer will definitely play on every Echo?
I've been going round in circles somewhat trying to encode files that'll play everywhere!
Source: amazon.com