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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 (14)
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Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
L’agrémenter visuellement
10 avril 2011MediaSPIP est basé sur un système de thèmes et de squelettes. Les squelettes définissent le placement des informations dans la page, définissant un usage spécifique de la plateforme, et les thèmes l’habillage graphique général.
Chacun peut proposer un nouveau thème graphique ou un squelette et le mettre à disposition de la communauté. -
Keeping control of your media in your hands
13 avril 2011, parThe vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)
Sur d’autres sites (3031)
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FFMPEG on AWS Lambda Only outputs half a second of video when converting video from mobile safari
18 août 2023, par user1825257I am running FFMPEG on AWS Lambda using nodejs and fluent-ffmpeg. I am able to convert videos recorded on most devices / browsers, but when I attempt to convert videos recorded on Mobile Safari, the length of the output video is 1/2 a second regardless of the input length.


My Typescript code is :


import * as ffmpeg from 'fluent-ffmpeg';
 public static StandardizeVideoFormat(
 inputSignedUrl: string,
 filename: string,
 ): Promise<string> {
 const localFilePath = `/tmp/${Date.now()}_${filename}.mp4`;
 
 return new Promise((resolve, reject) => {
 ffmpeg(inputSignedUrl)
 .outputOptions([
 '-crf',
 '18',
 '-vcodec',
 'libx264',
 '-codec:a',
 'aac',
 '-preset',
 'medium',
 ])
 .output(localFilePath)
 .on('start', function (commandLine) {
 console.log('Spawned Ffmpeg with command: ' + commandLine);
 })
 .on('error', function (err) {
 reject(err);
 })
 .on('progress', function (progress) {
 console.log('progress', progress);
 })
 .on('end', function () {
 resolve(localFilePath);
 })
 .run();
 });
 }
</string>


Using FFprobe, The metadata of the input file is :


{
 streams: [
 {
 index: 0,
 codec_name: 'h264',
 codec_long_name: 'H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10',
 profile: 'Baseline',
 codec_type: 'video',
 codec_tag_string: 'avc1',
 codec_tag: '0x31637661',
 width: 1920,
 height: 1080,
 coded_width: 1920,
 coded_height: 1080,
 closed_captions: 0,
 film_grain: 0,
 has_b_frames: 0,
 sample_aspect_ratio: 'N/A',
 display_aspect_ratio: 'N/A',
 pix_fmt: 'yuvj420p',
 level: 40,
 color_range: 'pc',
 color_space: 'unknown',
 color_transfer: 'unknown',
 color_primaries: 'unknown',
 chroma_location: 'left',
 field_order: 'progressive',
 refs: 1,
 is_avc: 'true',
 nal_length_size: 4,
 id: '0x1',
 r_frame_rate: '30000/1001',
 avg_frame_rate: '60000/1991',
 time_base: '1/600',
 start_pts: 26,
 start_time: 0.043333,
 duration_ts: 4008,
 duration: 6.68,
 bit_rate: 10175170,
 max_bit_rate: 'N/A',
 bits_per_raw_sample: 8,
 nb_frames: 'N/A',
 nb_read_frames: 'N/A',
 nb_read_packets: 'N/A',
 extradata_size: 31,
 side_data_type: 'Display Matrix',
 displaymatrix: '',
 rotation: '-90',
 tags: [Object],
 disposition: [Object]
 },
 {
 index: 1,
 codec_name: 'aac',
 codec_long_name: 'AAC (Advanced Audio Coding)',
 profile: 'LC',
 codec_type: 'audio',
 codec_tag_string: 'mp4a',
 codec_tag: '0x6134706d',
 sample_fmt: 'fltp',
 sample_rate: 48000,
 channels: 1,
 channel_layout: 'mono',
 bits_per_sample: 0,
 initial_padding: 0,
 id: '0x2',
 r_frame_rate: '0/0',
 avg_frame_rate: '0/0',
 time_base: '1/48000',
 start_pts: 0,
 start_time: 0,
 duration_ts: 319488,
 duration: 6.656,
 bit_rate: 181302,
 max_bit_rate: 'N/A',
 bits_per_raw_sample: 'N/A',
 nb_frames: 'N/A',
 nb_read_frames: 'N/A',
 nb_read_packets: 'N/A',
 extradata_size: 2,
 tags: [Object],
 disposition: [Object]
 }
 ],
 format: {
 filename: 'input.mp4',
 nb_streams: 2,
 nb_programs: 0,
 format_name: 'mov,mp4,m4a,3gp,3g2,mj2',
 format_long_name: 'QuickTime / MOV',
 start_time: 0,
 duration: 6.723333,
 size: 8651792,
 bit_rate: 10294646,
 probe_score: 100,
 tags: {
 major_brand: 'iso5',
 minor_version: '1',
 compatible_brands: 'isomiso5hlsf',
 creation_time: '2023-08-05T19:03:15.000000Z'
 }
 },
 chapters: []
}



Any ideas on why the output of my command on this file always results in a 0.5 second long output ?


-
The 7 GDPR Principles : A Guide to Compliance
11 août 2023, par Erin — Analytics Tips, GDPR -
How to resize dimensions of video through ffmpeg-python ?
25 janvier, par kunambiI'm trying to resize a video file which a user has uploaded to Django, by using
ffmpeg-python
. The documentation isn't very easy to understand, so I've tried to cobble this together from various sources.

This method is run in a celery container, in order to not slow the experience for the user. The problem I'm facing is that I can't seem to resize the video file. I've tried two different approaches :


from django.db import models
from io import BytesIO
from myapp.models import MediaModel


def resize_video(mypk: str) -> None:
 instance = MediaModel.objects.get(pk=mypk)
 media_instance: models.FileField = instance.media
 media_output = "test.mp4"
 buffer = BytesIO()

 for chunk in media_instance.chunks():
 buffer.write(chunk)

 stream_video = ffmpeg.input("pipe:").video.filter("scale", 720, -1) # resize to 720px width
 stream_audio = ffmpeg.input("pipe:").audio
 process = (
 ffmpeg.output(stream_video, stream_audio, media_output, acodec="aac")
 .overwrite_output()
 .run_async(pipe_stdin=True, quiet=True)
 )
 buffer.seek(0)
 process_out, process_err = process.communicate(input=buffer.getbuffer())
 # (pdb) process_out
 # b''

 # attempting to use `.concat` instead
 process2 = (
 ffmpeg.concat(stream_video, stream_audio, v=1, a=1)
 .output(media_output)
 .overwrite_output()
 .run_async(pipe_stdin=True, quiet=True)
 )
 buffer.seek(0)
 process2_out, process2_err = process2.communicate(input=buffer.getbuffer())
 # (pdb) process2_out
 # b''



As we can see, no matter which approach chosen, the output is an empty binary. The
process_err
andprocess2_err
both generate the following message :

ffmpeg version N-111491-g31979127f8-20230717 Copyright (c) 2000-2023 the
FFmpeg developers
 built with gcc 13.1.0 (crosstool-NG 1.25.0.196_227d99d)
 configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static
--pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64
--target-os=mingw32 --enable-gpl --enable-version3 --disable-debug
--disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2
--enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp
--enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl
--disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib
--enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth
--enable-chromaprint --enable-libdav1d --enable-libdavs2
--disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r
--enable-libgme --enable-libkvazaar --enable-libass --enable-libbluray
--enable-libjxl --enable-libmp3lame --enable-libopus --enable-librist
--enable-libssh --enable-libtheora --enable-libvpx --enable-libwebp
--enable-lv2 --enable-libvpl --enable-openal --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg
--enable-libopenmpt --enable-librav1e --enable-librubberband
--enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt
--enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm
--disable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc
--enable-libplacebo --enable-libx264 --enable-libx265 --enable-libxavs2
--enable-libxvid --enable-libzimg --enable-libzvbi
--extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags=
--extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp
--extra-version=20230717
 libavutil 58. 14.100 / 58. 14.100
 libavcodec 60. 22.100 / 60. 22.100
 libavformat 60. 10.100 / 60. 10.100
 libavdevice 60. 2.101 / 60. 2.101
 libavfilter 9. 8.102 / 9. 8.102
 libswscale 7. 3.100 / 7. 3.100
 libswresample 4. 11.100 / 4. 11.100
 libpostproc 57. 2.100 / 57. 2.100
 "Input #0, mov,mp4,m4a,3gp,3g2,mj2, frompipe:':\r\n"
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: mp42mp41
 creation_time : 2020-11-10T15:01:09.000000Z
 Duration: 00:00:04.16, start: 0.000000, bitrate: N/A
 Stream #0:0[0x1](eng): Video: h264 (Main) (avc1 / 0x31637661),
yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 2649 kb/s, 25 fps, 25
tbr, 25k tbn (default)
 Metadata:
 creation_time : 2020-11-10T15:01:09.000000Z
 handler_name : ?Mainconcept Video Media Handler
 vendor_id : [0][0][0][0]
 encoder : AVC Coding
 Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 317 kb/s (default)
 Metadata:
 creation_time : 2020-11-10T15:01:09.000000Z
 handler_name : #Mainconcept MP4 Sound Media Handler
 vendor_id : [0][0][0][0]
Stream mapping:
 Stream #0:0 (h264) -> scale:default (graph 0)
 scale:default (graph 0) -> Stream #0:0 (libx264)
 Stream #0:1 -> #0:1 (aac (native) -> aac (native))
[libx264 @ 00000243a23a1100] using SAR=1/1
[libx264 @ 00000243a23a1100] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 00000243a23a1100] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 00000243a23a1100] 264 - core 164 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2023 - 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, toaa37f8d7685f4df9af85b1cdcd95997e.mp4':\r\n"
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: mp42mp41
 encoder : Lavf60.10.100
 Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(tv, progressive),
800x450 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 12800 tbn
 Metadata:
 encoder : Lavc60.22.100 libx264
 Side data:
 cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 128 kb/s (default)
 Metadata:
 creation_time : 2020-11-10T15:01:09.000000Z
 handler_name : #Mainconcept MP4 Sound Media Handler
 vendor_id : [0][0][0][0]
 encoder : Lavc60.22.100 aac
frame= 0 fps=0.0 q=0.0 size= 0kB time=N/A bitrate=N/A
speed=N/A \r'
frame= 21 fps=0.0 q=28.0 size= 0kB time=00:00:02.75 bitrate= 
0.1kbits/s speed=4.75x \r'
[out#0/mp4 @ 00000243a230bd80] video:91kB audio:67kB subtitle:0kB other
streams:0kB global headers:0kB muxing overhead: 2.838559%
frame= 104 fps=101 q=-1.0 Lsize= 162kB time=00:00:04.13 bitrate=
320.6kbits/s speed=4.02x 
[libx264 @ 00000243a23a1100] frame I:1 Avg QP:18.56 size: 2456
[libx264 @ 00000243a23a1100] frame P:33 Avg QP:16.86 size: 1552
[libx264 @ 00000243a23a1100] frame B:70 Avg QP:17.55 size: 553
[libx264 @ 00000243a23a1100] consecutive B-frames: 4.8% 11.5% 14.4%
69.2%
[libx264 @ 00000243a23a1100] mb I I16..4: 17.3% 82.1% 0.6%
[libx264 @ 00000243a23a1100] mb P I16..4: 5.9% 15.2% 0.4% P16..4: 18.3% 
0.9% 0.4% 0.0% 0.0% skip:58.7%
[libx264 @ 00000243a23a1100] mb B I16..4: 0.8% 0.3% 0.0% B16..8: 15.4% 
1.0% 0.0% direct: 3.6% skip:78.9% L0:34.2% L1:64.0% BI: 1.7%
[libx264 @ 00000243a23a1100] 8x8 transform intra:68.2% inter:82.3%
[libx264 @ 00000243a23a1100] coded y,uvDC,uvAC intra: 4.2% 18.4% 1.2% inter:
1.0% 6.9% 0.0%
[libx264 @ 00000243a23a1100] i16 v,h,dc,p: 53% 25% 8% 14%
[libx264 @ 00000243a23a1100] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 6% 70% 1% 
1% 1% 1% 0% 0%
[libx264 @ 00000243a23a1100] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 46% 21% 15% 2% 
5% 4% 3% 3% 1%
[libx264 @ 00000243a23a1100] i8c dc,h,v,p: 71% 15% 13% 1%
[libx264 @ 00000243a23a1100] Weighted P-Frames: Y:30.3% UV:15.2%
[libx264 @ 00000243a23a1100] ref P L0: 46.7% 7.5% 34.6% 7.3% 3.9%
[libx264 @ 00000243a23a1100] ref B L0: 88.0% 10.5% 1.5%
[libx264 @ 00000243a23a1100] ref B L1: 98.1% 1.9%
[libx264 @ 00000243a23a1100] kb/s:177.73
[aac @ 00000243a23a2e00] Qavg: 1353.589



I'm at a loss right now, would love any feedback/solution.