[FFmpeg-devel] gcc: Remove auto-vectorization limitation.
Jiawei
jiawei at iscas.ac.cn
Wed May 21 13:17:19 EEST 2025
在 2025/5/21 14:52, Nicolas George 写道:
> Jiawei (HE12025-05-21):
>> particularly improving
>> performance on x86_64 (AVX), ARM64 (SVE) and RISC-V(RVV) architectures.
> Benchmark needed.
>
> Regards,
Hi Nicolas,
Since I am a gcc developer, I'm not so familiar with the FFmpeg test
flow, here is my test process,
if there exists anything uncorrect, please point me out:
1. Download the video bbb_sunflower_2160p_30fps_normal.mp4.zip
<https://download.blender.org/demo/movies/BBB/bbb_sunflower_2160p_30fps_normal.mp4.zip>
from https://download.blender.org/demo/movies/BBB/，
```
ffmpeg -i bbb_sunflower_2160p_30fps_normal.mp4 -t 60 -vf
"scale=1920:1080" -c:v libx265 -c:a libmp3lame 1080p_hevc_mp3.mp4
```
get the 1080p video as Benchmark test video
2. Build two version of FFmpeg, one with the modify, another without
the patch modif, using the gcc 13.3 release version,
verified with Intel(R) Core(TM) Ultra 9 285HX
Using patch:
```
./ffmpeg -benchmark -i ~/mp/1080p_hevc_mp3.mp4 -f null -
ffmpeg version N-119636-g96518c8d8d Copyright (c) 2000-2025 the FFmpeg
developers
built with gcc 13 (Ubuntu 13.3.0-6ubuntu2~24.04)
configuration: --prefix=/home/pz9115/ffpo --disable-ffplay --arch=x64
--extra-cflags=-O3 --enable-static --target-os=linux
libavutil 60. 2.100 / 60. 2.100
libavcodec 62. 3.101 / 62. 3.101
libavformat 62. 0.102 / 62. 0.102
libavdevice 62. 0.100 / 62. 0.100
libavfilter 11. 0.100 / 11. 0.100
libswscale 9. 0.100 / 9. 0.100
libswresample 6. 0.100 / 6. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'/home/pz9115/mp/1080p_hevc_mp3.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
title : Big Buck Bunny, Sunflower version
artist : Blender Foundation 2008, Janus Bager Kristensen 2013
composer : Sacha Goedegebure
encoder : Lavf60.16.100
comment : Creative Commons Attribution 3.0 -
http://bbb3d.renderfarming.net
genre : Animation
Duration: 00:01:00.00, start: 0.000000, bitrate: 1564 kb/s
Stream #0:0[0x1](und): Video: hevc (Main) (hev1 / 0x31766568),
yuv420p(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1429 kb/s, 30
fps, 30 tbr, 15360 tbn (default)
Metadata:
handler_name : GPAC ISO Video Handler
vendor_id : [0][0][0][0]
encoder : Lavc60.31.102 libx265
Stream #0:1[0x2](und): Audio: mp3 (mp3float) (mp4a / 0x6134706D),
48000 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : GPAC ISO Audio Handler
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> wrapped_avframe (native))
Stream #0:1 -> #0:1 (mp3 (mp3float) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
title : Big Buck Bunny, Sunflower version
artist : Blender Foundation 2008, Janus Bager Kristensen 2013
composer : Sacha Goedegebure
genre : Animation
comment : Creative Commons Attribution 3.0 -
http://bbb3d.renderfarming.net
encoder : Lavf62.0.102
Stream #0:0(und): Video: wrapped_avframe, yuv420p(tv, progressive),
1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn (default)
Metadata:
encoder : Lavc62.3.101 wrapped_avframe
handler_name : GPAC ISO Video Handler
vendor_id : [0][0][0][0]
Stream #0:1(und): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
(default)
Metadata:
encoder : Lavc62.3.101 pcm_s16le
handler_name : GPAC ISO Audio Handler
vendor_id : [0][0][0][0]
[out#0/null @ 0x565233669eb0] video:731KiB audio:11250KiB subtitle:0KiB
other streams:0KiB global headers:0KiB muxing overhead: unknown
frame= 1800 fps=635 q=-0.0 Lsize=N/A time=00:01:00.00 bitrate=N/A
speed=21.2x elapsed=0:00:02.83
bench: utime=11.324s stime=0.290s rtime=2.834s
bench: maxrss=186556KiB
```
Without patch(here I add the fno-tree-vectorize directly):
./ffmpeg -benchmark -i ~/mp/1080p_hevc_mp3.mp4 -f null -
ffmpeg version N-119636-g96518c8d8d Copyright (c) 2000-2025 the FFmpeg
developers
built with gcc 13 (Ubuntu 13.3.0-6ubuntu2~24.04)
configuration: --prefix=/home/pz9115/ffpo --disable-ffplay --arch=x64
--extra-cflags='-O3 -fno-tree-vectorize' --enable-static --target-os=linux
libavutil 60. 2.100 / 60. 2.100
libavcodec 62. 3.101 / 62. 3.101
libavformat 62. 0.102 / 62. 0.102
libavdevice 62. 0.100 / 62. 0.100
libavfilter 11. 0.100 / 11. 0.100
libswscale 9. 0.100 / 9. 0.100
libswresample 6. 0.100 / 6. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'/home/pz9115/mp/1080p_hevc_mp3.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
title : Big Buck Bunny, Sunflower version
artist : Blender Foundation 2008, Janus Bager Kristensen 2013
composer : Sacha Goedegebure
encoder : Lavf60.16.100
comment : Creative Commons Attribution 3.0 -
http://bbb3d.renderfarming.net
genre : Animation
Duration: 00:01:00.00, start: 0.000000, bitrate: 1564 kb/s
Stream #0:0[0x1](und): Video: hevc (Main) (hev1 / 0x31766568),
yuv420p(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1429 kb/s, 30
fps, 30 tbr, 15360 tbn (default)
Metadata:
handler_name : GPAC ISO Video Handler
vendor_id : [0][0][0][0]
encoder : Lavc60.31.102 libx265
Stream #0:1[0x2](und): Audio: mp3 (mp3float) (mp4a / 0x6134706D),
48000 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : GPAC ISO Audio Handler
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> wrapped_avframe (native))
Stream #0:1 -> #0:1 (mp3 (mp3float) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
title : Big Buck Bunny, Sunflower version
artist : Blender Foundation 2008, Janus Bager Kristensen 2013
composer : Sacha Goedegebure
genre : Animation
comment : Creative Commons Attribution 3.0 -
http://bbb3d.renderfarming.net
encoder : Lavf62.0.102
Stream #0:0(und): Video: wrapped_avframe, yuv420p(tv, progressive),
1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn (default)
Metadata:
encoder : Lavc62.3.101 wrapped_avframe
handler_name : GPAC ISO Video Handler
vendor_id : [0][0][0][0]
Stream #0:1(und): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
(default)
Metadata:
encoder : Lavc62.3.101 pcm_s16le
handler_name : GPAC ISO Audio Handler
vendor_id : [0][0][0][0]
[out#0/null @ 0x55eb196b7eb0] video:731KiB audio:11250KiB subtitle:0KiB
other streams:0KiB global headers:0KiB muxing overhead: unknown
frame= 1800 fps=509 q=-0.0 Lsize=N/A time=00:01:00.00 bitrate=N/A
speed= 17x elapsed=0:00:03.53
bench: utime=21.544s stime=0.349s rtime=3.536s
bench: maxrss=181580KiB
And I also tested on a RISC-V develop board MUSE Pi Pro, Here following
is the configure and result:
Using patch:
root at spacemit-k1-x-MUSE-Pi-Pro-board:~# ./ffpv/bin/ffmpeg -benchmark -i
1080p_hevc_mp3.mp4 -f null -
ffmpeg version n6.1.2 Copyright (c) 2000-2024 the FFmpeg developers
built with gcc 16.0.0 (g3fc902e738b) 20250519 (experimental)
configuration: --prefix=/home/pz9115/ffpv --disable-ffplay
--arch=riscv --extra-cflags='-march=rv64gcv_zba_zbb_zbs -O3 -ffast-math'
--cross-prefix=/home/pz9115/rvv/bin/riscv64-unknown-linux-gnu-
--cc=/home/pz9115/rvv/bin/riscv64-unknown-linux-gnu-gcc
--cxx=/home/pz9115/rvv/bin/riscv64-unknown-linux-gnu-g++ --enable-static
--enable-cross-compile --target-os=linux --disable-rvv
libavutil 58. 29.100 / 58. 29.100
libavcodec 60. 31.102 / 60. 31.102
libavformat 60. 16.100 / 60. 16.100
libavdevice 60. 3.100 / 60. 3.100
libavfilter 9. 12.100 / 9. 12.100
libswscale 7. 5.100 / 7. 5.100
libswresample 4. 12.100 / 4. 12.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1080p_hevc_mp3.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
title : Big Buck Bunny, Sunflower version
artist : Blender Foundation 2008, Janus Bager Kristensen 2013
composer : Sacha Goedegebure
encoder : Lavf60.16.100
comment : Creative Commons Attribution 3.0 -
http://bbb3d.renderfarming.net
genre : Animation
Duration: 00:01:00.00, start: 0.000000, bitrate: 1564 kb/s
Stream #0:0[0x1](und): Video: hevc (Main) (hev1 / 0x31766568),
yuv420p(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1429 kb/s, 30
fps, 30 tbr, 15360 tbn (default)
Metadata:
handler_name : GPAC ISO Video Handler
vendor_id : [0][0][0][0]
encoder : Lavc60.31.102 libx265
Stream #0:1[0x2](und): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : GPAC ISO Audio Handler
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> wrapped_avframe (native))
Stream #0:1 -> #0:1 (mp3 (mp3float) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Odd rotation angle.
If you want to help, upload a sample of this file to
https://streams.videolan.org/upload/ and contact the ffmpeg-devel
mailing list. (ffmpeg-devel at ffmpeg.org)Output #0, null, to 'pipe:':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
title : Big Buck Bunny, Sunflower version
artist : Blender Foundation 2008, Janus Bager Kristensen 2013
composer : Sacha Goedegebure
genre : Animation
comment : Creative Commons Attribution 3.0 -
http://bbb3d.renderfarming.net
encoder : Lavf60.16.100
Stream #0:0(und): Video: wrapped_avframe, yuv420p(tv, progressive),
1080x1920 [SAR 1:1 DAR 9:16], q=2-31, 200 kb/s, 30 fps, 30 tbn (default)
Metadata:
handler_name : GPAC ISO Video Handler
vendor_id : [0][0][0][0]
encoder : Lavc60.31.102 wrapped_avframe
Stream #0:1(und): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
(default)
Metadata:
handler_name : GPAC ISO Audio Handler
vendor_id : [0][0][0][0]
encoder : Lavc60.31.102 pcm_s16le
[out#0/null @ 0x28a82e0] video:844kB audio:11250kB subtitle:0kB other
streams:0kB global headers:0kB muxing overhead: unknown
frame= 1800 fps= 42 q=-0.0 Lsize=N/A time=00:00:59.97 bitrate=N/A
speed=1.41x
bench: utime=207.150s stime=5.319s rtime=42.608s
bench: maxrss=162160kB
Without patch(same added the fno-tree-vectorize directly):
./ffp/bin/ffmpeg -benchmark -i 1080p_hevc_mp3.mp4 -f null -
ffmpeg version n6.1.2 Copyright (c) 2000-2024 the FFmpeg developers
built with gcc 16.0.0 (g38163c874a3-dirty) 20250515 (experimental)
configuration: --prefix=/home/pz9115/ffp --disable-ffplay
--arch=riscv --sysroot=/home/pz9115/rv/sysroot
--extra-cflags='-march=rv64gcv_zba_zbb_zbc_zbs_zca_zcd -mabi=lp64d -O3
-fno-tree-vectorize -static' --extra-ldflags=-static
--cross-prefix=/home/pz9115/rv/bin/riscv64-unknown-linux-gnu-
--enable-static --enable-cross-compile --target-os=linux --disable-rvv
libavutil 58. 29.100 / 58. 29.100
libavcodec 60. 31.102 / 60. 31.102
libavformat 60. 16.100 / 60. 16.100
libavdevice 60. 3.100 / 60. 3.100
libavfilter 9. 12.100 / 9. 12.100
libswscale 7. 5.100 / 7. 5.100
libswresample 4. 12.100 / 4. 12.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1080p_hevc_mp3.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
title : Big Buck Bunny, Sunflower version
artist : Blender Foundation 2008, Janus Bager Kristensen 2013
composer : Sacha Goedegebure
encoder : Lavf60.16.100
comment : Creative Commons Attribution 3.0 -
http://bbb3d.renderfarming.net
genre : Animation
Duration: 00:01:00.00, start: 0.000000, bitrate: 1564 kb/s
Stream #0:0[0x1](und): Video: hevc (Main) (hev1 / 0x31766568),
yuv420p(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1429 kb/s, 30
fps, 30 tbr, 15360 tbn (default)
Metadata:
handler_name : GPAC ISO Video Handler
vendor_id : [0][0][0][0]
encoder : Lavc60.31.102 libx265
Stream #0:1[0x2](und): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 128 kb/s (default)
Metadata:
handler_name : GPAC ISO Audio Handler
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> wrapped_avframe (native))
Stream #0:1 -> #0:1 (mp3 (mp3float) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
title : Big Buck Bunny, Sunflower version
artist : Blender Foundation 2008, Janus Bager Kristensen 2013
composer : Sacha Goedegebure
genre : Animation
comment : Creative Commons Attribution 3.0 -
http://bbb3d.renderfarming.net
encoder : Lavf60.16.100
Stream #0:0(und): Video: wrapped_avframe, yuv420p(tv, progressive),
1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn (default)
Metadata:
handler_name : GPAC ISO Video Handler
vendor_id : [0][0][0][0]
encoder : Lavc60.31.102 wrapped_avframe
Stream #0:1(und): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
(default)
Metadata:
handler_name : GPAC ISO Audio Handler
vendor_id : [0][0][0][0]
encoder : Lavc60.31.102 pcm_s16le
[out#0/null @ 0x2729630] video:844kB audio:11250kB subtitle:0kB other
streams:0kB global headers:0kB muxing overhead: unknown
frame= 1800 fps= 30 q=-0.0 Lsize=N/A time=00:00:59.97 bitrate=N/A
speed= 1x
bench: utime=321.145s stime=2.475s rtime=59.960s
bench: maxrss=131532kB
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