Op 04-12-14 om 09:08 schreef Miroslav Lichvar: > Just curious, is there any explanation why this improves the > compression ratio? Is it a bug?
The error scale is used directly in the calculation of the expected bits per residual sample. Substituting the current code gives bps = 0.5 * log(0.5 * M_LN2 * M_LN2 / (FLAC__double)total_samples * lpc_error) / M_LN2 which is equivalent to bps = 0.5 * log(0.5 / (FLAC__double)total_samples * lpc_error) / M_LN2 - 0.23 So, practically, this change increases the expected bits per sample by 0.23. Apparently this better estimates the residual bits per sample. I've been experimenting with different values, and it seems increasing the bps even further is beneficial for some kinds of music, but not for others. This value seems to benefit all kinds of sources. _______________________________________________ flac-dev mailing list flac-dev@xiph.org http://lists.xiph.org/mailman/listinfo/flac-dev
