Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.


Go Back   Doom9's Forum > Video Encoding > VP9 and AV1

Thread Tools Search this Thread Display Modes
Old 11th March 2023, 03:21   #1  |  Link
Registered User
Join Date: Dec 2003
Posts: 487
Difference between ffmpeg vs ffmpeg pipe svtav1encapp

I have been trying to understand AV1 and beyond the bitrate oddly low testing multiple videos, I encoded the same video two ways, one straight ffmpeg using libsvtav1. The other ffmpeg piped to svtav1encapp. Content is 4k HDR10 and 1 hour 47 minutes. Below are the results:

Straight libsvtav1:
ffmpeg.exe -y -i <video>.mkv -map 0:V:0 -c:v:0 libsvtav1 -pix_fmt yuv420p10le -svtav1-params "preset=3:keyint=300:crf=26:tune=0:enable-hdr=1:color-primaries=bt2020:transfer-characteristics=smpte2084:matrix-coefficients=bt2020-ncl:mastering-display=G(0.17,0.797)B(0.131,0.046)R(0.708,0.292)WP(0.3127,0.329)L(1000,0.0005):content-light=639,243:chroma-sample-position=topleft:film-grain-denoise=0:film-grain=0: profile=main:level=51" converted.ivf

Output was:
  • Took about 2 hours to encode with Ryzen 7950x
  • From mediainfo: 1 470 kb/s, 3840*1590 (2.40:1), at 23.976 (24000/1001) FPS, AV1 (Main@L5.1)
  • Resulting File size: 1,158,273 KB (is this real?)



ffmpeg -i <video>.mkv -map 0:v:0 -pix_fmt yuv420p10le -f yuv4mpegpipe -strict -1 - | SvtAv1EncApp -i stdin --preset 3 --keyint 300 --crf 26 --tune 0 --enable-hdr 1 --color-primaries bt2020 --transfer-characteristics smpte2084 --matrix-coefficients bt2020-ncl --mastering-display "G(0.17,0.797)B(0.131,0.046)R(0.708,0.292)WP(0.3127,0.329)L(1000,0.0005)" --content-light 639,243 --chroma-sample-position topleft --film-grain-denoise 0 --film-grain 0 --profile main --level 5.1 -b pipe.ivf

Output was:
  • Took about 11 hours to run with Ryzen 7950x
  • From mediainfo: 1 237 kb/s, 3840*1590 (2.40:1), at 23.976 (24000/1001) FPS, AV1 (Main@L5.1)
  • File size: 974,627 KB

So technically these encodes should be identical as far as values.

Any idea if these bitrates make sense

What is causing the difference in encoding duration?

Note I can't really compare the output as my monitors are like 14 years old and trying to compare one at a time on my TV won't be easy to tell when I have to watch one and stop and load the other. All i can say is there is no pixilation and things look clear this just seems wrong.

Last edited by jriker1; 11th March 2023 at 19:08.
jriker1 is offline   Reply With Quote
Old 17th March 2023, 01:55   #2  |  Link
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,827
Are you using the same version in the standalone and ffmpeg encodes?
Ben Waggoner
Principal Video Specialist, Amazon Prime Video

My Compression Book
benwaggoner is offline   Reply With Quote

av1, ffmpeg

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +1. The time now is 15:49.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.