flac

FLAC (Free Lossless Audio Codec) Encoder

Options

The following options are supported by FFmpeg's flac encoder.

'compression_level'

Sets the compression level, which chooses defaults for many other options if they are not set explicitly. Valid values are from 0 to 12, 5 is the default.

'frame_size'

Sets the size of the frames in samples per channel.

'lpc_coeff_precision'

Sets the LPC coefficient precision, valid values are from 1 to 15, 15 is the default.

'lpc_type'

Sets the first stage LPC algorithm

'none'

LPC is not used

'fixed'

fixed LPC coefficients

'levinson'

'cholesky'

'lpc_passes'

Number of passes to use for Cholesky factorization during LPC analysis

'min_partition_order'

The minimum partition order

'max_partition_order'

The maximum partition order

'prediction_order_method'

'estimation'

'2level'

'4level'

'8level'

'search'

Bruteforce search

'log'

'ch_mode'

Channel mode

'auto'

The mode is chosen automatically for each frame

'indep'

Channels are independently coded

'left_side'

'right_side'

'mid_side'

'exact_rice_parameters'

Chooses if rice parameters are calculated exactly or approximately. if set to 1 then they are chosen exactly, which slows the code down slightly and improves compression slightly.

'multi_dim_quant'

Multi Dimensional Quantization. If set to 1 then a 2nd stage LPC algorithm is applied after the first stage to finetune the coefficients. This is quite slow and slightly improves compression.