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5
AAC / Re: How do I know what encoder my M4A file has been converted to?
Last post by Markuza97 -
You can use ffmpeg: ffmpeg -i input.m4a -codec copy -ss xx:xx:xx -to xx:xx:xx output.m4a
Replace xx with desired time - hh/mm/ss. Like includemeout said, make sure it is under 30 seconds.
Please use some well known song because we (me) need lossless version so we can compare it.

Edit: My brain sometimes stops working - I blame heat...

They will be using either fhg or fdk.
I just encoded couple of files and fhg cuts at 16 kHz and fdk cuts at 18 kHz. (128 CBR)
You can use Spek to analyze couple of files. Probably easiest method.

Edit 2: It is FhG. He sent me sample.
7
AAC / Re: How do I know what encoder my M4A file has been converted to?
Last post by U2021 -
Unless you reduce them to <30-second clips, you cannot, for TOS compatibilty.

But, is it really necessary? Have you tried/read some of the tools/tips pointed out to you here?

Yes, tried all, there's nothing to show about AAC encoder on those tools.
I can't edit that file, because remuxing or editing the file will change the original file.
Can I DM you?
10
AAC / Re: How do I know what encoder my M4A file has been converted to?
Last post by includemeout -
Experts can use some tricks like spectrum analyzer and guess the encoder.
Naoki Shibata and ff123 used to do that quite frequently. But that was when MP3 was the dominant format (i.e, for our geeky standards) and the then-available codecs (Blade, Xing, etc.) could be single-handedly counted.

Quote
There used to be a program called EncSpot for MP3 files, I dunno if there is something similar for AAC.
And so did Audio Identifier a bit later on, which accepted other formats. But Media Info (also available on Android) more than filled that gap these days. The former can be found on rarewares.org, [EDIT:] I mean, its spawn for even rarer birds, ReallyRarewares.
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