problem converting .m4a to .aac files

[alex5908]

Hello everybody,
I am trying to convert .m4a to .aac with mp4box v.8 and getting this

"C:\Users\AS>mp4box -raw 1 in.m4a -out out.aac
Error creating file in.m4a: Requested URL is not valid or cannot be found"

How can I solve this issue?

[sneaker]

Just:

mp4box -raw 1 "in.m4a"

It should create "in_track1.aac".

[alex5908]

Just:

mp4box -raw 1 "in.m4a"

It should create "in_track1.aac".

Thanks for the fast response.

I'd like to convert m4a to aac but not vice versa.
Could you write the whole script too?

[sneaker]

I don't understand what you mean by "whole script". What is not "whole" about what I posted?

[teodz1984]

mp4box only mux stuff to mp4 container..

use converter to. transform file to aac

[alex5908]

mp4box only mux stuff to mp4 container..

use converter to. transform file to aac

What is the exact name of the program?

[teodz1984]

use audacity.. easy to open and save as

[El Heggunte]

mp4box only mux stuff to mp4 container..

use converter to. transform file to aac

Please stop posting incorrect information.

https://sourceforge.net/p/gpac/feature-requests/54/

P.S.: the «official» GPAC documentation suxxx very-badly Not to mention that the MP4Box command-lines switches and its help screen were written by a d0rk.

[alex5908]

use audacity.. easy to open and save as

It does not open m4a files. Just wav and aif.

[alex5908]

mp4box worked for me but it does not preserve tags. Which progg does preserve tags?

[teodz1984]

foobar
dbpoweramp
EZ CD Audio Converter

[alex5908]

foobar
dbpoweramp
EZ CD Audio Converter

I've started with EZ CD Conv. Yes, it does the job like charm. I just thought I will find something which will just change tags (and without actual converting).

[teodz1984]

use audacity.. easy to open and save as

It does not open m4a files. Just wav and aif.

I just loaded a m4a into audacity
it imported as a ffmpeg compatible file

[teodz1984]

Hello everybody,
I am trying to convert .m4a to .aac

I've started with EZ CD Conv. Yes, it does the job like charm. I just thought I will find something which will just change tags (and without actual converting).

Well Using the proper tool helps..

[jagabo]

Why don't you just use ffmpeg?

ffmpeg -i input.m4a -acodec copy output.aac

Or in a batch file onto which you can drag/drop an m4a file:

ffmpeg -i "%~dpnx1" -acodec copy "%~dpn1.aac"

Or a batch file that will remux all .m4a files in a folder to .aac:

FOR %%F in (*.m4a) do (ffmpeg.exe -i "%%~dpnxF" -acodec copy "%%~dpnF.aac")

[alex5908]

Why don't you just use ffmpeg? [/CODE]

Will that preserve the tags?

[jagabo]

Why don't you just use ffmpeg? [/CODE]

Will that preserve the tags?

I believe it does. But I don't have any m4a files to test. Or you might have to add "-map_metadata 0" to the command line.

ffmpeg.exe -i "%~dpnx1" -acodec copy -map_metadata 0 "%~dpn1.aac"

[alex5908]

Why don't you just use ffmpeg? [/CODE]

Will that preserve the tags?

I believe it does. But I don't have any m4a files to test. Or you might have to add "-map_metadata 0" to the command line.

ffmpeg.exe -i "%~dpnx1" -acodec copy -map_metadata 0 "%~dpn1.aac"

Сould you try that?
https://workupload.com/file/g3s3EkQD

[sneaker]

That's an AAC file. Not m4a container.

What is the purpose of this anyways? Some Googling says it is possible to put ID3 tags into ADTS AAC (I don't know if ffmpeg can write such files) but it seems very uncommon while tagged aac-in-m4a is very common.

[alex5908]

That's an AAC file. Not m4a container.

What is the purpose of this anyways? Some Googling says it is possible to put ID3 tags into ADTS AAC (I don't know if ffmpeg can write such files) but it seems very uncommon while tagged aac-in-m4a is very common.

Sorry, wrong file. Please try to convert from .m4a to .aac this one with ffmpeg. https://workupload.com/file/yQG8WaaG
The purpose is that my player can't read .m4a files tags correctly. There's no problem with reading .aac files, though.

[jagabo]

I was able to remux to aac and copy metadata tags with the following ffmpeg command line:

ffmpeg.exe -i input.m4a -acodec copy -write_apetag 1 output.aac

Got a hint from here: https://trac.ffmpeg.org/ticket/2269

[alex5908]

I was able to remux to aac and copy metadata tags with the following ffmpeg command line:

ffmpeg.exe -i input.m4a -acodec copy -write_apetag 1 output.aac

Got a hint from here: https://trac.ffmpeg.org/ticket/2269

Thanks. Windows Mediainfo can see the tag but my player does not. It just reads the song as "output.aac". No song name, no album. Nothing.

[jagabo]

Not all players support ape tags in aac. Do you have any aac files for which your player displays metadata info?

I wasn't able to find what the "1" after the write_apetag meant. Maybe it means ape version 1. Try using 2 instead.

<oops> No, 2 doesn't work. Program aborts with error. </oops>

[teodz1984]

values 0 and 1 only acc to https://gist.github.com/tayvano/6e2d456a9897f55025e25035478a3a50feature either on or off

[teodz1984]

what player are you using?


many players usually have a hard time with aac tags. it may be a matter of finding one that works..

what about the one converted with ezaudio converter?

[jagabo]

I tried with several Windows players. MPCBE, MPCHC, PotPlayer, KMPlayer, and SMPlayer showed the APE tags. WMP and VLC did not (though it might be because I don't know how to enable the display in those players).

[alex5908]

what player are you using?


many players usually have a hard time with aac tags. it may be a matter of finding one that works..

what about the one converted with ezaudio converter?

Fiio M5. It's a hardware player. Portable. Not software.
The song tags of files converted with ezaudio converter are of no problem

[alex5908]

Not all players support ape tags in aac. Do you have any aac files for which your player displays metadata info?

This one is converted from flac to aac with EZ CD Converter.
https://workupload.com/file/rmBbBmMH

[jagabo]

Not all players support ape tags in aac. Do you have any aac files for which your player displays metadata info?

This one is converted from flac to aac with EZ CD Converter.
https://workupload.com/file/rmBbBmMH

That file contains ID3 tags. I didn't see any indication that ffmpeg can write ID3 tags with the aac/adts muxer. But I tried it and it worked:

ffmpeg.exe -i input.m4a -acodec copy -write_id3v2 1 output.aac

The write_id3v2 flag was found in the aiff muxer docs.

[teodz1984]

Portable Fiio M5. It's a hardware player.

Hardware players will have compatibility problems with tag support... I've seen tag support problems with AAC in Android even with Android Apps
Android Players