[Libav-user] AAC encoding reliability
klaussfreire at gmail.com
Wed Apr 9 20:20:50 CEST 2014
On Wed, Apr 9, 2014 at 2:02 PM, Gyula Hatalyák
<hatalyak.gyula at artklikk.hu> wrote:
> I would like to ask from which version of ffmpeg is built-in AAC encoding
Tip is not reliable yet, but there is a patch that makes it
Beware, though, that patch makes M/S auto-encoding the default, and it
still has some bugs. You need to specify -stereo_mode off (or maybe,
just maybe -stereo_mode on is enough to keep the bugs out). I'm pretty
sure -stereo_mode off is as stable as you can get (I've encoded hours
and hours and no artifacts there), but it's less efficient than many
other implementations - due to precisely M/S coding being off.
> Is it still in experimental state?
It's not for me to decide, but I hope after that patch becomes final
and stable enough, it will stop being so.
> What fixes happened recently?
The patch addresses bugs in rate control, bit allocation at high bit
rates, M/S encoding bugs, bit allocation efficiency in general,
clipping due to quantization noise, and implements VBR encoding.
> Should I use libvo codec instead?
> Which is recommended?
While the mentioned patch improves things a lot (and IMHO it's better
than FAAC at least), in the short term I'd still suggest not using it
for productive purposes.
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