diff options
| -rw-r--r-- | vp8/encoder/firstpass.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/vp8/encoder/firstpass.c b/vp8/encoder/firstpass.c index b3b06ee70..c7b0a27af 100644 --- a/vp8/encoder/firstpass.c +++ b/vp8/encoder/firstpass.c @@ -2953,10 +2953,26 @@ static void find_next_key_frame(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame) // We do three calculations for kf size. // The first is based on the error score for the whole kf group. - // The second (optionaly) on the key frames own error if this is smaller than the average for the group. - // The final one insures that the frame receives at least the allocation it would have received based on its own error score vs the error score remaining - - allocation_chunks = ((cpi->twopass.frames_to_key - 1) * 100) + kf_boost; // cpi->twopass.frames_to_key-1 because key frame itself is taken care of by kf_boost + // The second (optionaly) on the key frames own error if this is + // smaller than the average for the group. + // The final one insures that the frame receives at least the + // allocation it would have received based on its own error score vs + // the error score remaining + // Special case if the sequence appears almost totaly static + // as measured by the decay accumulator. In this case we want to + // spend almost all of the bits on the key frame. + // cpi->twopass.frames_to_key-1 because key frame itself is taken + // care of by kf_boost. + if ( decay_accumulator >= 0.99 ) + { + allocation_chunks = + ((cpi->twopass.frames_to_key - 1) * 10) + kf_boost; + } + else + { + allocation_chunks = + ((cpi->twopass.frames_to_key - 1) * 100) + kf_boost; + } // Normalize Altboost and allocations chunck down to prevent overflow while (kf_boost > 1000) |