[FFmpeg-user] NVDEC/NVENC resources underutilization
Marcin Woźniak
marcin.wozniak at intermania.pl
Wed Feb 28 16:53:23 EET 2018
Try the same command but remove overlay filter and check.
Marcin
W dniu 28.02.2018 o 14:44, Garri Djavadyan pisze:
> Hello FFmpeg community,
>
>
> I faced a problem with NVDEC/NVENC resources underutilization while
> running one ffmpeg instance.
>
> We use ffmpeg to convert various format videos to MP4(h264/aac) and
> applying logo overlay. Hardware decoding and encoding process is
> performed by NVDEC and NVENC chips. For example, our cmdline is:
>
> /usr/local/ffmpeg-dev/bin/ffmpeg -y -c:v mpeg4_cuvid \
> -i input.avi -i logo.png \
> -filter_complex [0:v:0][1:v:0]overlay=10:10[out1] \
> -map [out1] -map 0:a:0 -map_metadata -1 -map_chapters -1 \
> -c:v h264_nvenc -b:v 1024k -r 25 \
> -c:a libfdk_aac -b:a 128k \
> -movflags faststart out.mp4
>
>
> The overal transcoding process is greatly accelerated. But I see, that
> NVDEC/NVENC cycles are not fully utilized. For example:
>
> # nvidia-smi dmon
> # gpu pwr temp sm mem enc dec mclk pclk
> # Idx W C % % % % MHz MHz
> 0 32 50 11 3 22 16 3802 1632
> 0 32 50 11 3 23 14 3802 1632
> 0 32 50 12 3 22 15 3802 1632
> 0 33 51 13 3 18 15 3802 1632
> 0 32 51 12 3 17 11 3802 1632
> 0 32 51 10 2 20 13 3802 1632
>
>
> I tried to find a bottleneck, but all system resources are OK. For
> example, CPU (top output, at least 60% idle):
>
> Tasks: 296 total, 3 running, 292 sleeping, 0 stopped, 1 zombie
> %Cpu0 : 14,6 us, 0,7 sy, 0,0 ni, 84,7 id, 0,0 wa, 0,0 hi, 0,0
> si, 0,0 st
> %Cpu1 : 11,2 us, 1,4 sy, 0,0 ni, 87,5 id, 0,0 wa, 0,0 hi, 0,0
> si, 0,0 st
> %Cpu2 : 14,5 us, 1,3 sy, 0,0 ni, 84,2 id, 0,0 wa, 0,0 hi, 0,0
> si, 0,0 st
> %Cpu3 : 4,4 us, 0,7 sy, 0,0 ni, 94,9 id, 0,0 wa, 0,0 hi, 0,0
> si, 0,0 st
> %Cpu4 : 39,6 us, 1,3 sy, 0,0 ni, 59,1 id, 0,0 wa, 0,0 hi, 0,0
> si, 0,0 st
> %Cpu5 : 2,4 us, 0,7 sy, 0,0 ni, 96,6 id, 0,3 wa, 0,0 hi, 0,0
> si, 0,0 st
> %Cpu6 : 2,7 us, 4,3 sy, 0,0 ni, 93,0 id, 0,0 wa, 0,0 hi, 0,0
> si, 0,0 st
> %Cpu7 : 21,0 us, 0,7 sy, 0,0 ni, 78,3 id, 0,0 wa, 0,0 hi, 0,0
> si, 0,0 st
> КiB Mem: 12261384 total, 10578352 used, 1683032 free, 4809968
> buffers
> КiB Swap: 7999484 total, 584072 used, 7415412 free. 1431448 cached
> Mem
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
> COMMAND
>
> 21245 user 20 0 17,516g 235792 187228 R 101,3 1,9 1:21.15
> ffmpeg
>
> 1512 root -51 0 0 0 0 S 7,0 0,0 17:29.39
> irq/47-nvidia
>
> -----------------
> Memory:
>
> # free -m
> total used free shared buffers cach
> ed
> Mem: 11974 8619 3354 133 3758 653
> -/+ buffers/cache: 4207 7766
> Swap: 7811 570 7241
>
> -----------------
> Storage I/O:
>
> # iostat -x 1 3
> Linux 3.13.0-142-generic (user-desktop) 28.02.2018 _x86
> _64_ (8 CPU)
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 10,86 3,03 1,43 4,75 0,00 79,93
>
> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
> avgrq-sz avgqu-sz await r_await w_await svctm %util
> sda 0,49 0,00 0,01 0,00 0,29 0,00 45
> ,90 0,00 47,45 47,45 0,00 14,55 0,02
> sdb 849,21 769,16 47,81 22,18 3859,21 3935,51 222
> ,74 9,18 131,22 23,62 363,20 4,05 28,38
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 14,65 0,00 1,78 0,00 0,00 83,57
>
> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
> avgrq-sz avgqu-sz await r_await w_await svctm %util
> sda 0,00 0,00 0,00 0,00 0,00 0,00 0
> ,00 0,00 0,00 0,00 0,00 0,00 0,00
> sdb 0,00 0,00 0,00 0,00 0,00 0,00 0
> ,00 0,00 0,00 0,00 0,00 0,00 0,00
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 21,24 0,00 2,53 0,51 0,00 75,73
>
> Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
> avgrq-sz avgqu-sz await r_await w_await svctm %util
> sda 0,00 0,00 0,00 0,00 0,00 0,00 0
> ,00 0,00 0,00 0,00 0,00 0,00 0,00
> sdb 0,00 7,00 0,00 3,00 0,00 88,00 58
> ,67 0,04 13,33 0,00 13,33 13,33 4,00
>
>
> --------------------
> FFmper version and configuration options:
>
> # /usr/local/ffmpeg-dev/bin/ffmpeg -version
> ffmpeg version N-90054-g474194a Copyright (c) 2000-2018 the FFmpeg
> developers
> built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.4)
> configuration: --prefix=/usr/local/ffmpeg-dev --enable-gpl --enable-
> nonfree --enable-libfdk-aac --enable-libx264 --enable-nvenc --enable-
> libnpp
> libavutil 56. 7.101 / 56. 7.101
> libavcodec 58. 11.101 / 58. 11.101
> libavformat 58. 9.100 / 58. 9.100
> libavdevice 58. 1.100 / 58. 1.100
> libavfilter 7. 12.100 / 7. 12.100
> libswscale 5. 0.101 / 5. 0.101
> libswresample 3. 0.101 / 3. 0.101
> libpostproc 55. 0.100 / 55. 0.100
>
>
> ---------------------
> NVIDIA driver and card information:
>
> # nvidia-smi
> Wed Feb 28 17:20:13 2018
> +--------------------------------------------------------------------
> ---------+
> | NVIDIA-SMI 384.111 Driver Version:
> 384.111 |
> |-------------------------------+----------------------+---------------
> -------+
> | GPU Name Persistence-M| Bus-Id Disp.A | Volatile
> Uncorr. ECC |
> | Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-
> Util Compute M. |
> |===============================+======================+===============
> =======|
> | 0 GeForce GTX 106... Off | 00000000:01:00.0 On
> | N/A |
> | 0% 53C P2 32W / 150W | 939MiB / 6071MiB
> | 11% Default |
> +-------------------------------+----------------------+---------------
> -------+
>
>
> +--------------------------------------------------------------------
> ---------+
> | Processes: GPU
> Memory |
> | GPU PID Type Process
> name Usage |
> |======================================================================
> =======|
> | 0 1423 G /usr/bin/X
> 443MiB |
> | 0 2555 G compiz
> 224MiB |
> | 0 14879 G ...-token=ACEXXXXXXXXX
> XX2E9DDXXXXXXXE41 107MiB |
> | 0 21458 C /usr/local/ffmpeg-
> dev/bin/ffmpeg 159MiB |
> +--------------------------------------------------------------------
> ---------+
>
>
> I believe I overlooked something, or maybe there are some limitations.
> So, I kindly ask your suggestions. Many thanks in advance!
>
>
> Garri
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