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Somos millones 1
21 juillet 2014, par
Mis à jour : Juin 2015
Langue : français
Type : Video
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Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
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Binaires obligatoires FFMpeg : encodeur principal, permet de transcoder presque tous les types de fichiers vidéo et sonores dans les formats lisibles sur Internet. CF ce tutoriel pour son installation ; Oggz-tools : outils d’inspection de fichiers ogg ; Mediainfo : récupération d’informations depuis la plupart des formats vidéos et sonores ;
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Sur d’autres sites (4656)
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FFmpeg start slowly with multiple instance on nvidia T4 GPU
3 août 2020, par wyWang

environment:


- 

- OS:Centos7
- FFMPEG version : 4.2
- GPU : NVIDIA Tesla T4










I have a requirement to work with multiple FFMPEG instance,command like this :


ffmpeg -y -loglevel info -hwaccel cuvid -hwaccel_output_format cuda -c:v h264_cuvid \
 -i http://xx/xxxx.mp4 \
 -c:v h264_nvenc -ss 0 -t 600 out.mp4



and the output like this :


ffmpeg version 4.2.git Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-39)
 configuration: --enable-cuda-nvcc --enable-cuda --enable-cuvid --enable-nvenc --enable-libnpp --prefix=/snbeauty//platform/centos --pkg-config-flags=--static --extra-cflags='-I/snbeauty//platform/centos/include -I/usr/local/cuda/include/ -Werror=implicit-function-declaration -std=gnu99' --extra-ldflags='-L/snbeauty//platform/centos/lib64 -L/snbeauty//platform/centos/lib -L/usr/local/lib64 -L/usr/lib64 -L/usr/local/cuda/lib64 -L/lib64' --extra-libs='-lpthread -lm -lEGL -lGL -lpng -lYNEffect -ltracker -lcuda -lcudart' --bindir=/snbeauty//platform/centos/bin --enable-static --enable-nonfree --enable-libfreetype --enable-libfribidi --enable-libfontconfig --enable-filters --enable-version3 --enable-gpl --enable-libass --enable-libfdk_aac --enable-encoder=libfdk_aac --enable-opengl --enable-filter=xiu --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libtheora --enable-libwebp --enable-frei0r --enable-openssl --enable-gray --enable-libxml2 --enable-libxvid
 libavutil 56. 42.100 / 56. 42.100
 libavcodec 58. 73.102 / 58. 73.102
 libavformat 58. 39.101 / 58. 39.101
 libavdevice 58. 9.103 / 58. 9.103
 libavfilter 7. 77.100 / 7. 77.100
 libswscale 5. 6.100 / 5. 6.100
 libswresample 3. 6.100 / 3. 6.100
 libpostproc 55. 6.100 / 55. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://xxx/xxxx.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.29.100
 Duration: 00:38:52.05, start: 0.000000, bitrate: 5370 kb/s
 Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080, 5245 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 119 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (h264_cuvid) -> h264 (h264_nvenc))
 Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'out.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.39.101
 Stream #0:0(und): Video: h264 (h264_nvenc) (Main) (avc1 / 0x31637661), cuda, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 2000 kb/s, 25 fps, 12800 tbn, 25 tbc (default)
 Metadata:
 handler_name : VideoHandler
 encoder : Lavc58.73.102 h264_nvenc
 Side data:
 cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000 vbv_delay: N/A
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 encoder : Lavc58.73.102 aac
frame=15000 fps=336 q=26.0 Lsize= 152462kB time=00:10:00.00 bitrate=2081.6kbits/s speed=13.4x 
video:142668kB audio:9418kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.247139%
[aac @ 0x32437c0] Qavg: 168.657

real 0m45.568s
user 0m29.034s
sys 0m2.961s



is very fast


But when I try concurrent 10 processes to run this command with different input url,ffmpeg start is very slowly. Then I found FFmpeg is slowly in this step :


Stream mapping:
 Stream #0:0 -> #0:0 (h264 (h264_cuvid) -> h264 (h264_nvenc))
 Stream #0:1 -> #0:1 (aac (native) -> aac (native))



When the video is very short(like 0.5s or 1s), FFmpeg takes a long time to start.The actual codec takes less time than the boot time.


I would like to ask what causes this problem ? (Nvidia GPU limit or FFmpeg) .And any way to solve it.


Thanks !


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FFMPEG(C++) - Iam getting this error while accessing webcam [closed]
31 juillet 2020, par Vetagiri Hrushikesh2020-08-01 00:31:56.099431+0530 Video_Encoder[30853:426264] [] CMIOHardware.cpp:917:CMIODeviceStopStream the System is exiting
2020-08-01 00:31:56.099508+0530 Video_Encoder[30853:426264] [] CMIOHardware.cpp:1332:CMIOStreamCopyBufferQueue the System is exiting
2020-08-01 00:31:56.124804+0530 Video_Encoder[30853:426264] [] CMIOHardware.cpp:333:CMIOObjectGetPropertyData the System is exiting
2020-08-01 00:31:56.124880+0530 Video_Encoder[30853:426264] [] CMIO_DALA_System.cpp:264:GetPropertyData error 1970171760 (unop) getting property selector (inot) scope (glob) element 0
2020-08-01 00:31:56.125011+0530 Video_Encoder[30853:426264] [] CMIOHardware.cpp:333:CMIOObjectGetPropertyData the System is exiting
2020-08-01 00:31:56.125055+0530 Video_Encoder[30853:426264] [] CMIO_DALA_System.cpp:264:GetPropertyData error 1970171760 (unop) getting property selector (inot) scope (glob) element 0
Program ended with exit code : 1


Thanks in Advance
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FFMPEG cannot find H264 encoder
31 juillet 2020, par Serban StoenescuI am running ffmpeg from a program, and we built ffmpeg ourselves (we did not install it with package managers or pre-built stuff).
This is the command that is built :


2020-07-31 12:14:11.942 INFO ffmpeg::FFTranscoder Executing: "../deps/ffmpeg/bin/ffmpeg" -y -r 26.062 -i ""/home/sstoenescu/Work/myproject/sample/myvideo.h264"" -c:v openh264 -vcodec h264 -movflags +faststart ""/home/sstoenescu/Work/myproject/sample/myvideo.mp4""



The file myvideo.h264 is valid, I can play it with ffplay and I can run ffprobe on it without problems.
However, the command above gives this error :


ffmpeg version N-98068-g16bdc2b541 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
 configuration: --arch=x86_64 --cpu=nehalem --disable-ffplay --enable-shared --enable-network --enable-gpl --enable-libx265 --enable-encoder=libx265 --disable-hwaccels --enable-hwaccel=h264_qsv --enable-hwaccel=h264_vaapi
 libavutil 56. 50.100 / 56. 50.100
 libavcodec 58. 90.100 / 58. 90.100
 libavformat 58. 44.100 / 58. 44.100
 libavdevice 58. 9.103 / 58. 9.103
 libavfilter 7. 84.100 / 7. 84.100
 libswscale 5. 6.101 / 5. 6.101
 libswresample 3. 6.100 / 3. 6.100
 libpostproc 55. 6.100 / 55. 6.100
[h264 @ 0x5597c38defc0] error while decoding MB 86 45, bytestream -30
[h264 @ 0x5597c38defc0] concealing 2723 DC, 2723 AC, 2723 MV errors in I frame
Input #0, h264, from '/home/sstoenescu/Work/edvr/laba/gaoazar.h264':
 Duration: N/A, bitrate: N/A
 Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1200k tbn, 50 tbc
Multiple -c, -codec, -acodec, -vcodec, -scodec or -dcodec options specified for stream 0, only the last option '-c:v h264' will be used.
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_v4l2m2m))
Press [q] to stop, [?] for help
[h264 @ 0x5597c38e30c0] error while decoding MB 86 45, bytestream -30
[h264 @ 0x5597c38e30c0] concealing 2723 DC, 2723 AC, 2723 MV errors in I frame
[h264_v4l2m2m @ 0x5597c3905500] Could not find a valid device
[h264_v4l2m2m @ 0x5597c3905500] can't configure encoder
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height



It used to work, I did not change anything in the command, so I'm assuming it's something in the way we build ffmpeg. We are using these flags :
--enable-decoder=h264 --enable-encoder=h264_qsv --enable-encoder=h264_vaapi --enable-decoder=h264 --enable-decoder=h264_qsv

Here's the full configuration :

./configure \
 --arch=x86_64 --cpu=nehalem \
 --disable-ffplay --enable-shared \
 --enable-network \
 --enable-gpl --enable-libx265 \
 --enable-encoder=libx265\
 --disable-hwaccels --enable-hwaccel=h264_qsv --enable-hwaccel=h264_vaapi \
 #--enable-encoder=libopenh264 \
 --enable-encoder=h264_qsv \
 --enable-encoder=h264_vaapi --enable-encoder=mjpeg --enable-encoder=gif \
 --enable-decoder=h264 --enable-decoder=h264_qsv \
 #--enable-decoder=libopenh264 
 --enable-libx264 \
 --enable-decoder=png \
 --enable-protocol=tcp \
 --enable-demuxer=rtsp --enable-demuxer=mov --enable-demuxer=h264 --enable-demuxer=image2 \
 --enable-muxer=mp4 --enable-muxer=h264 --enable-muxer=image2 \
 --prefix="./build"\
 --disable-doc



Any ideas what could be wrong ?
Thanks.


Regards,
Serban