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La conservation du net art au musée. Les stratégies à l’œuvre
26 mai 2011
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (34)
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Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir -
HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
For older browsers the Flowplayer flash fallback is used.
MediaSPIP allows for media playback on major mobile platforms with the above (...) -
De l’upload à la vidéo finale [version standalone]
31 janvier 2010, parLe chemin d’un document audio ou vidéo dans SPIPMotion est divisé en trois étapes distinctes.
Upload et récupération d’informations de la vidéo source
Dans un premier temps, il est nécessaire de créer un article SPIP et de lui joindre le document vidéo "source".
Au moment où ce document est joint à l’article, deux actions supplémentaires au comportement normal sont exécutées : La récupération des informations techniques des flux audio et video du fichier ; La génération d’une vignette : extraction d’une (...)
Sur d’autres sites (5385)
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FFMpeg Command work in command line, but not in python script. (Semi Solved)
20 février 2015, par FooldjOkay, kind of a weird problem. But I’m not sure whether it’s python, ffmpeg, or some stupid thing I’m doing wrong.
I’m trying to take a video, and take 1 frame a second, and output that frame to an image. Right now, if i use the command line with ffmpeg :
ffmpeg -i test.avi -r 1 -f image2 image-%3d.jpeg -pix_fmt rgb24 -vcodec rawrvideoIt outputs about 10 images, the images look fine, awesome. Now I have this code (right now some code from some github, as I wanted stuff that i was relatively sure would work, and mine is allll convoluted)
import subprocess as sp
import numpy as np
import re
import cv2
import time
FFMPEG_BIN = r'ffmpeg.exe'
INPUT_VID = 'test.avi'
def getInfo():
command = [FFMPEG_BIN,'-i', INPUT_VID, '-']
pipe = sp.Popen(command, stdout=sp.PIPE, stderr=sp.PIPE)
pipe.stdout.readline()
pipe.terminate()
infos = pipe.stderr.read()
infos_list = infos.split('\r\n')
res = re.search(' \d+x\d+ ',infos)
res = [int(x) for x in res.group(0).split('x')]
return res
res = getInfo()
command = [ FFMPEG_BIN,
'-i', INPUT_VID,
'-f', 'image2pipe',
'-pix_fmt', 'rgb24',
'-vcodec', 'rawvideo', '-']
pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8)
n = 0
im2 = []
try:
mog = cv2.BackgroundSubtractorMOG2(120,2,True)
while True:
raw_image = pipe.stdout.read(res[0]*res[1]*3)
# transform the byte read into a numpy array
image = np.fromstring(raw_image, dtype='uint8')
image = image.reshape((res[1],res[0],3))
rgbImg = image.copy()
fname = ('_tmp%03d.png'%time.time())
cv2.imwrite(fname, rgbImg)
# throw away the data in the pipe's buffer.
#pipe.stdout.flush()
n += 1
print n
except:
print 'done',n
pipe.kill()
cv2.destroyAllWindows()When I run this, I get 10 images, but they all have a Blue Tint ! I cannot for the life of me figure out why. I’ve done tons of searches, I’ve tried quite a few different codecs (usually just messes things up worse). The media info for the video file is here :
General
Complete name : test.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 85.0 KiB
Duration : 133ms
Overall bit rate : 5 235 Kbps
Video
ID : 0
Format : JPEG
Codec ID : MJPG
Duration : 133ms
Bit rate : 1 240 Kbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate : 30.000 fps
Color space : YUV
Chroma subsampling : 4:2:2
Bit depth : 8 bits
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.135
Stream size : 20.1 KiB (24%)Any suggestions ? It seems like it should be an RGB mixup...just not sure where at...
EDIT : So I fixed the problem by switching the blue and red channels with this code :
bChannel = rgbImg[ :, :,0]
rChannel = rgbImg[ :, :,2]
gChannel = rgbImg[ :, :,1]rgbArray = np.zeros((res[1],res[0],3), 'uint8')
rgbArray[...,0] = rChannel
rgbArray[...,1] = gChannel
rgbArray[...,2] = bChannelSo I guess this is now a question of, why is python mixing up these channels ? Is it a problem with python, or ffmpeg, the codec ?
Thanks !
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ffmpeg - merge mp3 and mp4 (duration difference)
8 décembre 2017, par dfionovI’m trying to merge mp4 and mp3 files with ffmpeg.
mp4 duration - 9.800 sec, mp3 - 58.540 sec. So i using -shortest key.
Code :ffmpeg -i video.mp4 -i audio.mp3 -c:v libx264 -c:a aac -strict experimental -shortest output.mp4After that i got output.mp4 with duration 9.846. Where is my error ? Why output video longer than source ? (9.846 sec and 9.800 sec).
Source mp4 MediaInfo :
General
Complete name : F:\video test\video.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : iso5 (iso5/dash)
File size : 3.19 MiB
Duration : 9 s 800 ms
Overall bit rate : 2 732 kb/s
Encoded date : UTC 2017-11-24 20:53:53
Tagged date : UTC 2017-11-24 20:53:53
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 9 s 800 ms
Bit rate : 2 729 kb/s
Maximum bit rate : 3 766 kb/s
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.118
Stream size : 3.19 MiB (100%)
Writing library : x264 core 146
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Tagged date : UTC 2017-11-24 20:53:53Source mp3 Mediainfo :
General
Complete name : F:\video test\audio.mp3
Format : MPEG Audio
File size : 1.19 MiB
Duration : 58 s 540 ms
Overall bit rate mode : Variable
Overall bit rate : 170 kb/s
Writing library : LAME3.99r
Audio
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Format settings : Joint stereo / MS Stereo
Duration : 58 s 540 ms
Bit rate mode : Variable
Bit rate : 170 kb/s
Minimum bit rate : 32.0 kb/s
Channel(s) : 2 channels
Sampling rate : 44.1 kHz
Frame rate : 38.281 FPS (1152 SPF)
Compression mode : Lossy
Stream size : 1.19 MiB (100%)
Writing library : LAME3.99r
Encoding settings : -m j -V 2 -q 0 -lowpass 18.5 --vbr-new -b 32Console output :
ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 7.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
Metadata:
major_brand : iso5
minor_version : 1
compatible_brands: iso5dash
creation_time : 2017-11-24T20:53:53.000000Z
Duration: 00:00:09.80, start: 0.000000, bitrate: 2732 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2259 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Input #1, mp3, from 'audio.mp3':
Duration: 00:00:58.54, start: 0.025057, bitrate: 170 kb/s
Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 170 kb/s
Metadata:
encoder : LAME3.99r
Side data:
replaygain: track gain - -2.200000, track peak - unknown, album gain - unknown, album peak - unknown,
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #1:0 -> #0:1 (mp3 (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 00000000005ab440] using SAR=1/1
[libx264 @ 00000000005ab440] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 00000000005ab440] profile High, level 3.1
[libx264 @ 00000000005ab440] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4':
Metadata:
major_brand : iso5
minor_version : 1
compatible_brands: iso5dash
encoder : Lavf57.83.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc57.107.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc57.107.100 aac
Side data:
replaygain: track gain - -2.200000, track peak - unknown, album gain - unknown, album peak - unknown,
frame= 54 fps=0.0 q=28.0 size= 0kB time=00:00:00.04 bitrate= 8.3kbits/s speed=0.0927x
frame= 80 fps= 80 q=28.0 size= 0kB time=00:00:01.09 bitrate= 0.4kbits/s speed=1.09x
frame= 98 fps= 65 q=28.0 size= 256kB time=00:00:01.83 bitrate=1143.5kbits/s speed=1.21x
frame= 119 fps= 59 q=28.0 size= 512kB time=00:00:02.67 bitrate=1570.9kbits/s speed=1.32x
frame= 144 fps= 56 q=28.0 size= 768kB time=00:00:03.66 bitrate=1715.0kbits/s speed=1.42x
frame= 167 fps= 52 q=28.0 size= 1024kB time=00:00:04.57 bitrate=1833.9kbits/s speed=1.44x
frame= 190 fps= 51 q=28.0 size= 1280kB time=00:00:05.50 bitrate=1905.5kbits/s speed=1.47x
frame= 218 fps= 51 q=28.0 size= 1792kB time=00:00:06.64 bitrate=2210.6kbits/s speed=1.56x
frame= 242 fps= 50 q=28.0 size= 2048kB time=00:00:07.56 bitrate=2216.4kbits/s speed=1.58x
frame= 245 fps= 41 q=-1.0 Lsize= 3045kB time=00:00:09.82 bitrate=2539.6kbits/s speed=1.65x
video:2880kB audio:156kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.298058%
[libx264 @ 00000000005ab440] frame I:14 Avg QP:20.01 size: 39750
[libx264 @ 00000000005ab440] frame P:106 Avg QP:23.85 size: 14578
[libx264 @ 00000000005ab440] frame B:125 Avg QP:24.63 size: 6770
[libx264 @ 00000000005ab440] consecutive B-frames: 22.9% 22.0% 15.9% 39.2%
[libx264 @ 00000000005ab440] mb I I16..4: 16.7% 80.3% 3.0%
[libx264 @ 00000000005ab440] mb P I16..4: 10.2% 36.2% 1.1% P16..4: 25.0% 7.9% 2.5% 0.0% 0.0% skip:17.1%
[libx264 @ 00000000005ab440] mb B I16..4: 2.3% 5.8% 0.2% B16..8: 31.4% 6.5% 0.9% direct: 3.7% skip:49.2% L0:51.8% L1:44.5% BI: 3.7%
[libx264 @ 00000000005ab440] 8x8 transform intra:76.1% inter:86.3%
[libx264 @ 00000000005ab440] coded y,uvDC,uvAC intra: 38.3% 52.1% 9.0% inter: 12.3% 20.1% 0.2%
[libx264 @ 00000000005ab440] i16 v,h,dc,p: 30% 28% 9% 33%
[libx264 @ 00000000005ab440] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 23% 19% 3% 3% 4% 4% 4% 4%
[libx264 @ 00000000005ab440] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 21% 14% 5% 7% 7% 6% 5% 3%
[libx264 @ 00000000005ab440] i8c dc,h,v,p: 45% 24% 25% 6%
[libx264 @ 00000000005ab440] Weighted P-Frames: Y:13.2% UV:6.6%
[libx264 @ 00000000005ab440] ref P L0: 71.7% 12.5% 12.9% 2.7% 0.2%
[libx264 @ 00000000005ab440] ref B L0: 92.8% 6.3% 0.9%
[libx264 @ 00000000005ab440] ref B L1: 98.3% 1.7%
[libx264 @ 00000000005ab440] kb/s:2406.56
[aac @ 00000000005adde0] Qavg: 511.420ffprobe -show_packets output too big, so I loaded to pastebin
https://pastebin.com/TYSMdceS -
Replicate the format of a video to another
10 octobre 2017, par BasjLet’s say I have :
-
video1.aviwhich is perfectly played (both sound and image) on my TV’s USB media input -
video2.aviwhich is not recognized by the TV : "Imposible to read this format"
I have tried lots of solutions, like :
ffmpeg -i video2.avi -codec:a libmp3lame -q:a 0 -ac 2 -ar 48000 -joint_stereo 0^
-codec:v libxvid -q:v 25 video2_reencoded.aviand when I compare
video1.aviwithvideo2_reencoded.aviwith MediaInfo, they look similar in most aspects, but finally the TV won’t playvideo2_reencoded.avi.Is there a way with
ffmpeg, to replicate all the specifications ofvideo1.avi(sound encoding properties, video encoding properties, image size, container type, etc.) onvideo2.avi?
Appendix : output of MediaInfo for the three videos. In this specific example,
video2.aviandvideo2_reencoded.aviare half-working : image ok but not the sound. In other video examples I tried,video2.aviandvideo2_reencoded.aviwould be both totally "Impossible to read".video1.avi(i.e. working)Format : AVI
Format/Info : Audio Video Interleave
File size : 352 MiB
Duration : 51 min 22 s
Overall bit rate : 959 kb/s
Writing application : VirtualDubMod 1.5.10.3 | ... || (build 2550/release)
Writing library : VirtualDubMod build 2550/release
Video
ID : 0
Format : MPEG-4 Visual
Format profile : Advanced Simple@L5
Format settings : BVOP1
Format settings, BVOP : 1
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (MPEG)
Codec ID : XVID
Codec ID/Hint : XviD
Duration : 51 min 22 s
Bit rate : 821 kb/s
Width : 720 pixels
Height : 400 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.114
Stream size : 302 MiB (86%)
Writing library : XviD 1.2.1 (UTC 2008-12-04)
Audio
ID : 1
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Codec ID : 55
Codec ID/Hint : MP3
Duration : 51 min 22 s
Bit rate mode : Constant
Bit rate : 128 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Compression mode : Lossy
Stream size : 47.0 MiB (13%)
Alignment : Aligned on interleaves
Interleave, duration : 40 ms (1.00 video frame)
Interleave, preload duration : 504 ms
Writing library : LAME3.99r
Encoding settings : -m s -V 4 -q 2 -lowpass 17 -b 128video2.avi(i.e. non-working)Format : AVI
Format/Info : Audio Video Interleave
File size : 1.37 GiB
Duration : 2 h 12 min
Overall bit rate : 1 478 kb/s
Writing application : VirtualDubMod 1.5.10.2 Fr | ... || (build 2540/release)
Writing library : VirtualDubMod build 2540/release
Video
ID : 0
Format : MPEG-4 Visual
Format profile : Advanced Simple@L5
Format settings : BVOP1
Format settings, BVOP : 1
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Muxing mode : Packed bitstream
Codec ID : XVID
Codec ID/Hint : XviD
Duration : 2 h 12 min
Bit rate : 1 084 kb/s
Width : 624 pixels
Height : 368 pixels
Display aspect ratio : 5:3
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.189
Stream size : 1.00 GiB (73%)
Writing library : XviD 1.2.1 (UTC 2008-12-04)
Audio
ID : 1
Format : AC-3
Format/Info : Audio Coding 3
Codec ID : 2000
Duration : 2 h 12 min
Bit rate mode : Constant
Bit rate : 384 kb/s
Channel(s) : 6 channels
Sampling rate : 48.0 kHz
Compression mode : Lossy
Stream size : 364 MiB (26%)
Alignment : Split accross interleaves
Interleave, duration : 40 ms (1.00 video frame)
Interleave, preload duration : 512 msvideo2_reencoded.avi(i.e. non-working, reencoded, but still non-working)Format : AVI
Format/Info : Audio Video Interleave
Format profile : OpenDML
File size : 1.13 GiB
Duration : 2 h 12 min
Overall bit rate : 1 227 kb/s
Writing application : Lavf57.26.100
Video
ID : 0
Format : MPEG-4 Visual
Format profile : Advanced Simple@L5
Format settings : BVOP1
Format settings, BVOP : 1
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Muxing mode : Packed bitstream
Codec ID : XVID
Codec ID/Hint : XviD
Duration : 2 h 12 min
Bit rate : 1 084 kb/s
Width : 624 pixels
Height : 368 pixels
Display aspect ratio : 5:3
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.189
Stream size : 1.00 GiB (88%)
Writing library : XviD 1.2.1 (UTC 2008-12-04)
Audio
ID : 1
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Codec ID : 55
Codec ID/Hint : MP3
Duration : 2 h 12 min
Bit rate mode : Constant
Bit rate : 128 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Compression mode : Lossy
Stream size : 120 MiB (10%)
Alignment : Aligned on interleaves
Interleave, duration : 24 ms (0.60 video frame) -
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