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FFmpeg: Adjust default proxy settings 

GOP size and quality are adjusted for h264 codec.

These new values are based on result of benchmark on 9 random files:
https://docs.google.com/spreadsheets/d/1nOyUGjoVWUyhQ2y2lAd8VtFfyaY1wQNGj1krCCNbk7Y/edit?usp=sharing

Reducing quality to 50 reduces proxy filesize by about 2x on average
and has no significant impact on decoding performance.

Increasing GOP size from 2 to 10 also reduces proxy filesize 2x-3x
while scrubbing is only about 8% slower. It is still around 100FPS
with 1920x1080 media.
This is unfortunately about 50% slower than MJPEG, but this can be
improved with `fastdecode` tune applied to libx264 encoder

Quite surprisingly h264 codec presets had little influence on proxy
building performance as well as proxy filesize. So far it looks that
FFmpeg does initialize encoder in different way then Blender.
This applies mot only for presets but for tune and profile libx264
setting.
Once this issue is resolved, performance of proxies may be optimized
further.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D10897
This commit is contained in:
Richard Antalik 2021-04-14 14:09:27 +02:00
parent 9ca55b10b8
commit b9207fb43d
Notes: blender-bot 2023-02-14 08:38:14 +01:00 
Referenced by issue #87534, Assert BLI_thread_is_main while rendering via a script
Referenced by issue #81088, system reload scripts doesn't work for addons stored in an alternative file path as set in preferences/file paths/scripts
Referenced by issue #79186, When returning to an open instance of Blender from other application, Blender (often) crashes immediately.
3 changed files with 3 additions and 3 deletions
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2
source/blender/imbuf/intern/indexer.c
View File

@ -500,7 +500,7 @@ static struct proxy_output_ctx *alloc_proxy_output_ffmpeg(
rv->c->codec_id = AV_CODEC_ID_H264;
rv->c->width = width;
rv->c->height = height;
rv->c->gop_size = 2;
rv->c->gop_size = 10;
rv->c->max_b_frames = 0;
/* Correct wrong default ffmpeg param which crash x264. */
rv->c->qmin = 10;

2
source/blender/makesdna/DNA_movieclip_defaults.h
View File

@ -32,7 +32,7 @@
.build_size_flag = IMB_PROXY_25, \
.build_tc_flag = IMB_TC_RECORD_RUN | IMB_TC_FREE_RUN | \
IMB_TC_INTERPOLATED_REC_DATE_FREE_RUN | IMB_TC_RECORD_RUN_NO_GAPS, \
.quality = 90, \
.quality = 50, \
}

2
source/blender/sequencer/intern/proxy.c
View File

@ -587,7 +587,7 @@ void SEQ_proxy_set(struct Sequence *seq, bool value)
seq->flag |= SEQ_USE_PROXY;
if (seq->strip->proxy == NULL) {
seq->strip->proxy = MEM_callocN(sizeof(struct StripProxy), "StripProxy");
seq->strip->proxy->quality = 90;
seq->strip->proxy->quality = 50;
seq->strip->proxy->build_tc_flags = SEQ_PROXY_TC_ALL;
seq->strip->proxy->build_size_flags = SEQ_PROXY_IMAGE_SIZE_25;
}