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ffv1enc: allow encoding with 1 slice for CIF and smaller in version 3

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the default is still 4 slices for any resolution, this just allows the user
to force 1 slice.
This in my quick test improves compression by 1% for a 320x240 sample

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-12-05 01:20:44 +01:00
parent 4e6f9db493
commit 8bf16e677f
1 changed files with 2 additions and 1 deletions
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3
libavcodec/ffv1enc.c
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@ -872,7 +872,8 @@ static av_cold int encode_init(AVCodecContext *avctx)
}
if (s->version > 1) {
for (s->num_v_slices = 2; s->num_v_slices < 9; s->num_v_slices++) {
s->num_v_slices = (avctx->width > 352 || avctx->height > 288 || !avctx->slices) ? 2 : 1;
for (; s->num_v_slices < 9; s->num_v_slices++) {
for (s->num_h_slices = s->num_v_slices; s->num_h_slices < 2*s->num_v_slices; s->num_h_slices++) {
if (avctx->slices == s->num_h_slices * s->num_v_slices && avctx->slices <= 64 || !avctx->slices)
goto slices_ok;