virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

Skip the bit allocation search if previous and current SNR offsets are the

Browse Source 
maximum value of 1023.
This speeds up overall encoding depending on the content and bitrate.
The most improvement is with high bitrates and/or low complexity content.

Originally committed as revision 26181 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2010-12-31 23:22:08 +00:00
parent 5128842ea2
commit 9c84a72a25
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
libavcodec/ac3enc.c
View File

@ -1116,6 +1116,13 @@ static int cbr_bit_allocation(AC3EncodeContext *s)
snr_offset = s->coarse_snr_offset << 4; snr_offset = s->coarse_snr_offset << 4;
/* if previous frame SNR offset was 1023, check if current frame can also
use SNR offset of 1023. if so, skip the search. */
if ((snr_offset | s->fine_snr_offset[0]) == 1023) {
if (bit_alloc(s, 1023) <= bits_left)
return 0;
}
while (snr_offset >= 0 && while (snr_offset >= 0 &&
bit_alloc(s, snr_offset) > bits_left) { bit_alloc(s, snr_offset) > bits_left) {
snr_offset -= 64; snr_offset -= 64;