[maemo-users] Recording calls

From: Craig Woodward woody at rochester.rr.com
Date: Mon Jan 18 23:00:04 EET 2010
Just one thought on this:

Most people are going to do playback on the device.  I would focus on the best codec available for recording and playback on the N900.  If people want to use it some other place, maybe making an export function (for Wav or MP3 or whatever) would suffice.  Worst case, make a selectable setting for which codec to use and let the user decide?

One idea:  Most phone conversations are mono.  Maybe a good strategy would be to record in stereo, with inbound on one channel and out-bound on the other?  It would make listening to it later interesting, since you could balance out one side or the other to catch pieces obscured by overlap?  Would also help clarify who said what on a 2-party call at least.

What's the app/widget garage name?  Would love to load it up and take it for a test drive.  I miss this from my 6230, though I honestly don't use it often.  (Had a hot key for it to turn it on while driving in case there was something I needed to take note of for later.  Hard to take notes while driving. :)

---- "Thomas Wälti" <twaelti at gmail.com> wrote: 

The problem is to find a compromise between:
a) CPU/power usage
b) Encoding efficiency
c) Playback capability
d) API availability

Due to a) and d), I'm only looking at the gstreamer encoders available
on the N900. Du to c) I have dropped the ANB and AWB codecs from
evaluation - I was unable to quickly find a standard software for
playback on Windows (e.g. WMP or VLC bot failed)

Tonight, I'll try low bitrate AAC as it is probably a good compromise
between these factors. I will also try speex, as it's on the N900 by
default and technically ideally for encoding this kind of audio.
However, I'm not so sure about playback capability on Windows :-) Is
Speex on the N900 using the DSP? Because I guess that all NokiXXXenc
are, e.g. the AAC one.


On Mon, Jan 18, 2010 at 09:37, Harri Haataja <realblades at gmail.com> wrote:
> 2010/1/14 Kahlil Johnson <jzarecta at gmail.com>:
>> On Thu, Jan 14, 2010 at 9:01 AM, Dave Neary <dneary at maemo.org> wrote:
>>> Thomas Wälti wrote:
>>>> The documented method looks really hacky, IMHO the gstreamer based
>>>> method of Zaheer Abbas Merali (gst guru par excellence :-) posted in
>>>> http://talk.maemo.org/showpost.php?p=464494&postcount=50 should be the
>>>> way to go. Using nokiaaacenc, you could probably directly save as AAC
>> What about a real free format like OGG vorbis?
> Um.. speex?
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