[FFmpeg-devel] [PATCH] avfilter: Enable in MP4 container both AMR-NB and AMR-WB

[Bob Kirnum]

Did not realize the files I shared were too large.  I copied them to a
shared Google Drive here . . .

https://drive.google.com/drive/folders/0B-TtYdUjPHBmM29uWkU4aHdReE0?usp=sharing

On Wed, May 17, 2017 at 3:30 PM, Bob Kirnum <bkirnum at gmail.com> wrote:

> Sorry for the delay.  Attached are two examples.  Both files play on
> Windows 10 using the 'Movies & TV' app, only the AMR-NB file has audio.
> Both play fine using VLC with audio.
>
> Thanks,
> Bob
>
> On Wed, May 17, 2017 at 9:23 AM, Carl Eugen Hoyos <ceffmpeg at gmail.com>
> wrote:
>
>> 2017-05-17 14:27 GMT+02:00 Hendrik Leppkes <h.leppkes at gmail.com>:
>> > On Wed, May 17, 2017 at 2:05 PM, Bob Kirnum <bkirnum at gmail.com> wrote:
>> >> Backwards compatibility tested running complete FATE testing.
>> >>
>> >> Our media server can record to and play from MP4 containing H.264 and
>> / or
>> >> AMR-NB / WB.  The codecs are proprietary implementations.  We use
>> >> libavformat for MP4 containers.  The recorded containers can be played
>> back
>> >> using third party tools (open source implementations).
>> >>
>> >
>> > So are you saying that there is no official specification for AMR in
>> > MP4, and these files are only compatible with your proprietary
>> > software?
>>
>> It says here (afaict) that such a specification exists:
>> http://www.mp4ra.org/codecs.html
>>
>> I thought that demuxing should already be supported and
>> that muxing may need specific atoms.
>>
>> Carl Eugen
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>
>