Convert to AAC
Convert a Audio file to AAC
Bitrate
The bitrate for the new file, the higher the bitrate the better the quality but larger the file.
When 'Automatic' is selected, FileFlows will not specify a bitrate and FFmpeg will automatically choose a bitrate to use.
When 'Same as source' is selected, the source tracks bitrate will be passed to FFmpeg as the bitrate for the new file.
Sample Rate
The sample rate to use
Channels
The number of channels the converted file will have.
If you specify more channels than the source, FFmpeg will automatically up-mix it.
If you specify fewer channels than the source, FFmpeg will automatically down-mix it.
Extension
Allows you to set a custom file extension to use instead of the automatic one determined by the codec.
Normalize
If the audio should be normalized with two pass audio normalization.
See Audio File Normalization for more information.
Outputs
- Audio converted and saved to temporary file
AAC Codec
You can customise the AAC codec to use by adding a variable AAC_Codec to the Varaibles page.
If you wish to use libfdk_aac for instance you can override it in here, otherwise it will use the standard aac encoder.
FileFlows does not ship with an FFmpeg that supports libfdk_aac so you must provide your own version of FFmpeg if you wish to use this codec.
libfdk_aac
When using libfdk_aac with VBR FileFlows will automatically convert the values 0-10 to 1-5.
High Efficiency
When not using libfdk_aac High Efficiency has little effect, however when using libfdk_aac with a quality of 1-2 (0-4 before conversion), this can drastically reduce the file size.