[FFmpeg-user] Conversion wav -> mp3 -> wav

[Rodolfo Medina]

Steve Boyer <steveboyer85 at gmail.com> writes:

> On Fri, Jun 23, 2017 at 7:11 AM, Rodolfo Medina <rodolfo.medina at gmail.com>
> wrote:
>
>> Steve Boyer <steveboyer85 at gmail.com> writes:
>>
>> > If you want to see what really happened, import both files into Audacity,
>> > use a filter to invert one of the files, and slide it around until they
>> are
>> > 1:1 (it's off slightly IIRC) and then hit "Play" or downmix to a single
>> > track. If both tracks are aligned correctly, you will hear the discarded
>> > portions of the original WAV file during the MP3 conversion.
>>
>>
>> In the two files music starts with a slight delay from one another, and it
>> seems I don't manage to slide them so to eliminate that delay...  Any
>> suggestion?
>>
>
> Trial and error - zoom in as far as you can, hit play, realize that it's
> off slightly, shift using the Time Shift Tool (looks like <----> in the
> toolbar) very very slightly, repeat. It takes some time, but I've done this
> comparing FFmpeg's encoding using the libfdk_aac encoder vs the aac encoder.


Now I managed to synchronize them...  but all happens is that they play
together now...  Where's the comparison...?  On the first of the two, I applied
the `invert' effect.

Rodolfo