Convert Audio
Convert an Audio file to the specified audio codec
Codec
The audio codec to convert the file into.
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.
VBR will not work with WAV and the flow will fail.
VBR uses qscale by default
Sample Rate
The sample rate to use
Channels
The number of channels the converted file will have.\nIf 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.
Skip If Codec Matches
If the existing audio codec matches, this file will not be processed regardless of the bitrate. Otherwise if off, the bitrate must be less than or equal to for it to skip.
Outputs
- Audio converted and saved to temporary file
- Audio already in codec, no conversion done
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.