Best tool to convert mp3 to aac (FFmpeg Vs NeroAacEnc) [closed]?

I will answer your second question. You are encoding the audio twice. This creates generational data loss and therefore needless quality loss.

There is no reason to encode with a lossy encoder (neroAacEnc) and then re-encode it again with another lossy encoder (vo-aacenc) that output the same format (AAC-LC). Before you perform any batch encoding you should decide if you want to use neroAacEnc or vo-aacenc, but using both is just a waste of time and data. As for quality (assuming the files come out around the same file size), the general assumption is: qtaacenc = neroAacEnc > faac => vo-aacenc > ffaacenc (the native FFmpeg AAC encoder), but of course quality perceptions can be subjective.

Differences may be small enough to make your decision based on encoding speed or ease of use rather than pure quality differences. Edit: You dramatically changed your question, so I will address it here. ALAC and AAC are two different formats.

ALAC is a lossless format, and AAC is a lossy format. To generalize, consider them similar to FLAC and MP3. One is not inherently "better" than the other, but have different use cases.

Research the differences between lossless and lossy audio formats and then you will know what encoder to use. Note that the FFmpeg ALAC encoder was reverse engineered, and Apple has recently released the ALAC encoder and decoder source code under the Apache license, so now you have two ALAC encoder choices.

Then what is the best way and if possible command to achieve the same. – Soham Dasgupta Dec 21 '11 at 4:47.

FYI Windows 7 comes with stock AAC Encoder, with dual DMO/MFT interface.

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