The recent compression preset retuning improved upon most material but it the few tracks that show regression are usually classical music. This patch improves compression by improving the LPC order guess, of which classical music benefits most. Improvement is 0.007% on average but up to 0.1%. I haven't seen regressions for any of my test samples. --- src/libFLAC/lpc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/libFLAC/lpc.c b/src/libFLAC/lpc.c index ca98c5c..f7c643a 100644 --- a/src/libFLAC/lpc.c +++ b/src/libFLAC/lpc.c @@ -1308,7 +1308,7 @@ FLAC__double FLAC__lpc_compute_expected_bits_per_residual_sample(FLAC__double lp FLAC__ASSERT(total_samples > 0); - error_scale = 0.5 * M_LN2 * M_LN2 / (FLAC__double)total_samples; + error_scale = 0.5 / (FLAC__double)total_samples; return FLAC__lpc_compute_expected_bits_per_residual_sample_with_error_scale(lpc_error, error_scale); } @@ -1338,7 +1338,7 @@ unsigned FLAC__lpc_compute_best_order(const FLAC__double lpc_error[], unsigned m FLAC__ASSERT(max_order > 0); FLAC__ASSERT(total_samples > 0); - error_scale = 0.5 * M_LN2 * M_LN2 / (FLAC__double)total_samples; + error_scale = 0.5 / (FLAC__double)total_samples; best_index = 0; best_bits = (unsigned)(-1); -- 1.9.1 --------------080402000802050707050708--