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M4A and FxOS

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Louis Stowasser

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Apr 29, 2013, 8:25:15 PM4/29/13
to dev-...@lists.mozilla.org
Is Apple Lossless Audio Codec (ALAC) not supported on Firefox OS? I have an M4A sound file and it won't play on the device. Converting to MP3 does work.

Here is the info about the sound I'm trying to play:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sound.m4a':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isom
creation_time : 2013-04-20 08:55:27
Duration: 00:05:43.07, start: 0.074376, bitrate: 49 kb/s
Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 47 kb/s

Cheers,
Louis

Hubert Figuière

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Apr 29, 2013, 8:44:32 PM4/29/13
to mozilla-...@lists.mozilla.org
On 29/04/13 08:25 PM, Louis Stowasser wrote:
> Is Apple Lossless Audio Codec (ALAC) not supported on Firefox OS? I have an M4A sound file and it won't play on the device.

m4a isn't ALAC.

Hub

Louis Stowasser

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Apr 29, 2013, 8:58:11 PM4/29/13
to Hubert Figuière, mozilla-...@lists.mozilla.org
Sorry, I'm pretty clueless with audio formats. So the way I understand it is M4A is the container format and the file can be encoded in ALAC or AAC, right?

Are both supported?

Thanks for the help!

On Apr 29, 2013, at 5:44 PM, Hubert Figuière <h...@mozilla.com> wrote:

> On 29/04/13 08:25 PM, Louis Stowasser wrote:
>> Is Apple Lossless Audio Codec (ALAC) not supported on Firefox OS? I have an M4A sound file and it won't play on the device.
>
> m4a isn't ALAC.
>
> Hub
> _______________________________________________
> dev-media mailing list
> dev-...@lists.mozilla.org
> https://lists.mozilla.org/listinfo/dev-media

Hubert Figuière

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Apr 29, 2013, 9:07:09 PM4/29/13
to mozilla-...@lists.mozilla.org
On 29/04/13 08:58 PM, Louis Stowasser wrote:
> Sorry, I'm pretty clueless with audio formats. So the way I understand it is M4A is the container format and the file can be encoded in ALAC or AAC, right?
>

Can be, but not necessarily:

As you said in the previous email

> Duration: 00:05:43.07, start: 0.074376, bitrate: 49 kb/s
> Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 47 kb/s

Which means it is AAC encoded.

Hub

Louis Stowasser

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Apr 29, 2013, 9:28:45 PM4/29/13
to Hubert Figuière, mozilla-...@lists.mozilla.org
I see. Then I guess it's meant to be supported on the device according to this: https://developer.mozilla.org/en-US/docs/HTML/Supported_media_formats#MPEG_H.264_(AAC_or_MP3)

On Apr 29, 2013, at 6:07 PM, Hubert Figuière <h...@mozilla.com> wrote:

> On 29/04/13 08:58 PM, Louis Stowasser wrote:
>> Sorry, I'm pretty clueless with audio formats. So the way I understand it is M4A is the container format and the file can be encoded in ALAC or AAC, right?
>>
>
> Can be, but not necessarily:
>
> As you said in the previous email
>
>> Duration: 00:05:43.07, start: 0.074376, bitrate: 49 kb/s
>> Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 47 kb/s
>
> Which means it is AAC encoded.
>

Marco Chen

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Apr 29, 2013, 10:01:27 PM4/29/13
to Louis Stowasser, mozilla-...@lists.mozilla.org, Hubert Figuière
Hi Louis,

Please refer to the link as below, and we are tracking a bug about the issue of identifying m4a container.

https://bugzilla.mozilla.org/show_bug.cgi?id=859711#c9

So m4a is supported by Firefox OS now, but there is a bug on it.

Sincerely yours.
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