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Topic: sample for ffmpeg aac (Read 5076 times) previous topic - next topic
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sample for ffmpeg aac

This is a sample for testing the ffmpeg aac encoder.  (Related thread )

It shows notable dropouts and collapse of highs.

The ffmpeg version is  N-73818-g9ebe041:
    encoder        : Lavf56.40.101
    Stream #0:0: Audio: aac (libvo_aacenc) (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 128 kb/s
      encoder        : Lavc56.49.101 libvo_aacenc

For comparison, a 64kbps file encoded with Apple's encoder (using qaac --cbr 64).  Even --cbr 32 --he sounds better than ffmpeg's one.

Side note: The full song is this one:

sample for ffmpeg aac

Reply #1
I cannot edit the post.

The settings used are "-i input.wav  output.m4a" .

This selected the libvo_aacenc at 128kbps.

Selecting the native aac encoder with:
    -c:a aac -strict experimental -b:a 128k
produces better results.

sample for ffmpeg aac

Reply #2
Similar to FDK and FAAC, vo-aacenc is just an external library FFmpeg provides a wrapper for.

FDK would have been chosen as a default AAC encoder if it was enabled in your build.

sample for ffmpeg aac

Reply #3
The VisualOn AAC encoder (vo-aacenc) is known to be very poor, but it is claimed (though disputed) to be released under a free license so it is usually included by default. The FDK encoder is not, you have build your own ffmpeg with support, or get a build with support somewhere.
From the ffmpeg AAC FAQ:
Which encoder should I use? What provides the best quality?
For AAC-LC the likely answer is: libfdk_aac > libfaac > Native FFmpeg AAC encoder (aac) > libvo_aacenc.

sample for ffmpeg aac

Reply #4
It would be nice if they also marked the vo-aacenc external library in ffmpeg as '-strict experimental'.

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