I have a bunch of AAC files I need to convert so they'll play on my car stereo.
AAC, WAV, MP3, & WMA are the formats it is supposed to play, however, it seems to only recognize M4A format, and not AAC.
I converted all the AACs to M4A, but I noticed very high sample rates (some nearing 1000 kb/s) along with significantly larger file sizes compared to the AAC originals.
Researching here, it seems AAC and M4A are in fact different formats that cannot be "re-packaged"
My goal being high sound-quality, what format/conversion method is recommended?
Are the high sample rates inevitable with any kind of recoding? Strangely enough, a few random AACs (~192 kb/s) converted to M4A with slightly lower sample rates (~150 kb/s).
+ Reply to Thread
Results 1 to 8 of 8
Perhaps you can achieve what you want without re-encoding your files at all. It's best to avoid re-encoding when possible.
You may first want to rename your files. AFAIK m4a is just a made up extension to distinguish audio only mp4 files. If renaming file extensions doesn't work, you may try muxing aac files into mp4 using yamb or such.
AAC is M4A.
By sample rate I guess you mean bitrate. Sample rate is a completely different thing. As for the file size, you are probably converting to ALAC (Apple Lossless Audio Codec)."The greatest trick the Devil ever pulled was convincing the world he didn't exist."
Ozok is right on. Try renaming files first. If that doesn't work, you can use Yamb or mp4muxer, which are both GUIs for mp4box and mp4creator respectively. This step is simply muxing, the "re-packaged" version you mentioned, by placing the audio stream into a different container, or simply demuxing it to a raw AAC stream - whatever works.
If you're a newbie, and this is too much for you, just use a simple MP3 encoder, encode at constant bitrate, and 192kb/s to get most quality and you're done. BUT, I only say this if you keep the Source. I'm only suggesting an easy way to make it work in your vehicle, but it will lose quality and you SHOULD keep the Source separately if you do this.I hate VHS. I always did.
DBPoweramp was Apple Lossless, with an m4a icon next to it (?).
Yes, M4A is MP4 contaner format extention for audio-only files. MP4/M4A can store ALAC (Apple Lossless Audio Codec) or AAC (Advanced Audio Coding), which is lossy codec. In both cases extention is same - M4A.