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Autres articles (79)
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Gestion générale des documents
13 mai 2011, parMédiaSPIP ne modifie jamais le document original mis en ligne.
Pour chaque document mis en ligne il effectue deux opérations successives : la création d’une version supplémentaire qui peut être facilement consultée en ligne tout en laissant l’original téléchargeable dans le cas où le document original ne peut être lu dans un navigateur Internet ; la récupération des métadonnées du document original pour illustrer textuellement le fichier ;
Les tableaux ci-dessous expliquent ce que peut faire MédiaSPIP (...) -
Le profil des utilisateurs
12 avril 2011, parChaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...) -
Des sites réalisés avec MediaSPIP
2 mai 2011, parCette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.
Sur d’autres sites (8788)
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Bewildering issue - FFmpeg segment filter desyncs video
14 mai 2018, par r_jeiI need to segment a large (72GB) Prores video file and merge the segments to get a file identical to the original.
./ffmpeg -i video.mov -codec copy -f segment -segment_time 300 -segment_list list.ffcat -reset_timestamps 1 -v error chunk_%d.movUnfortunately the segments that come from running this command get out of sync after a few seconds of playback with Quicktime Player. Interestingly, seeking, rewinding or fast forwarding appears to resync the video correctly for at least a few seconds.
The following warning appears whenever a new segment is written :
[segment @ 0x7f87ae001200] Opening 'chunk_0.mov' for writing
[mov @ 0x7f87ad807200] Valid timecode frame rate must be specified. Minimum value is 1Yet, setting the framerate with
-r 24doesn’t help.Some potentially relevant metadata :
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'A004_04121423_C001.mov':
Duration: 00:13:31.25, start: 0.000000, bitrate: 710117 kb/s
Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709, progressive), 3840x2160, 707415 kb/s, SAR 1:1 DAR 16:9, 24 fps, 24 tbr, 24 tbn, 24 tbc (default)
Metadata:
creation_time : 2018-04-12T20:23:16.000000Z
handler_name : ?Apple Alias Data Handler
timecode : 14:23:16:02
Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
Metadata:
creation_time : 2018-04-12T20:23:16.000000Z
handler_name : ?Apple Alias Data Handler
timecode : 14:23:16:02
Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
Metadata:
creation_time : 2018-04-12T20:23:16.000000Z
handler_name : ?Apple Alias Data Handler
timecode : 14:23:16:02
Output #0, segment, to 'chunk_%d.mov':
Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le(bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 707415 kb/s, 24 fps, 24 tbr, 12288 tbn, 24 tbc (default)
Metadata:
creation_time : 2018-04-12T20:23:16.000000Z
handler_name : ?Apple Alias Data Handler
timecode : 14:23:16:02
Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s (default)
Metadata:
creation_time : 2018-04-12T20:23:16.000000Z
handler_name : ?Apple Alias Data Handler
timecode : 14:23:16:02
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)I’m on OS X.
Thanks so much for your time and help on this issue ! I certainly hope I’m not missing something obvious :)
UPDATE (May 10) : Comparing the original video file with the segments, I’ve found some interesting differences. Adobe Premiere reports that the original video has the following properties :
QuickTime Details:
Movie contains 1 video track(s), 1 audio track(s), 0 closed caption track(s), **and 1 timecode track(s).**
Video:
There are 19470 frames with a **duration of 1/24th.**
Video track 1:
Duration is **0:13:31:06**
Video data block #1:
Frame Size = 3840 x 2160
Compressor =
**Quality = Most (-2623.00)
Temporal = Most (1.00)**
Timecode data block #1:
Start Time = 14:23:16:02
Reel name =On the other hand, when examining the video resulting from stitching together the segments, we find the following :
QuickTime Details:
Movie contains 1 video track(s), 1 audio track(s), 0 closed caption track(s), **and 0 timecode track(s).**
Video:
There are 19470 frames with a **duration of 41/1000ths.**
Video track 1:
Duration is **0:01:06:00**
Video data block #1:
Frame Size = 3840 x 2160
Compressor =
**Quality = Normal (3.00)
Temporal = Normal (3.00)** -
youtube-dl sometime hangs with "[ffmpeg] Correcting container"
20 mai 2018, par user292344Ubuntu 16.04
/usr/local/bin/youtube-dl --version
2018.05.09I have a bash script that attemts to download a youtube video. The output is below. The problem is that sometimes it works perfectly (completes quickly).
But most of the time it hangs on "Correcting container....". Does anyone know why ?+ /usr/local/bin/youtube-dl --verbose -x 'https://www.youtube.com/watch?v=8HVWitAW-Qg'
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'-x', u'https://www.youtube.com/watch?v=8HVWitAW-Qg']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.05.09
[debug] Python version 2.7.12 (CPython) - Linux-4.4.0-124-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: avconv 2.8.14-0ubuntu0.16.04.1, avprobe 2.8.14-0ubuntu0.16.04.1, ffmpeg 2.8.14-0ubuntu0.16.04.1, ffprobe 2.8.14-0ubuntu0.16.04.1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] 8HVWitAW-Qg: Downloading webpage
[youtube] 8HVWitAW-Qg: Downloading video info webpage
[youtube] 8HVWitAW-Qg: Extracting video information
[debug] Invoking downloader on u'https://r5---sn-5uaeznkl.googlevideo.com/videoplayback?expire=1526159728&source=youtube&key=yt6&mime=audio%2Fmp4&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cusequic%2Cexpire&keepalive=yes&lmt=1518142590597815&dur=231.131&mv=m&mt=1526137933&ms=au%2Conr&signature=18BB34F3716B412AC5757872DD2AF402B6EE20D2.43D2E68B5A5ED2E2D3076DF9264B9BB723484821&ip=71.81.217.251&c=WEB&initcwndbps=1583750&mn=sn-5uaeznkl%2Csn-p5qs7n7l&clen=3671757&gir=yes&id=o-AOxj8Rg2IuZek8KwvgPy-N7_FSGzxQ0Zl2HX1T4gepLf&ipbits=0&fvip=5&ei=EAX3WqbOH8fg4QSlkrGoAg&pl=20&mm=31%2C26&itag=140&usequic=no&requiressl=yes&ratebypass=yes'
[download] Destination: Top 10 cute kitten videos compilation-8HVWitAW-Qg.m4a
[download] 100% of 3.50MiB in 00:00
[ffmpeg] Correcting container in "Top 10 cute kitten videos compilation-8HVWitAW-Qg.m4a"
[debug] ffmpeg command line: avconv -y -i 'file:Top 10 cute kitten videos compilation-8HVWitAW-Qg.m4a' -c copy -f mp4 'file:Top 10 cute kitten videos compilation-8HVWitAW-Qg.temp.m4a'
^C
ERROR: Interrupted by user -
Build Opencv3.1 with ffmpeg
10 mai 2018, par batumanI tried to build Opencv3.1 at Ubuntu16.04 with ffmpeg.
I follow the instructions how to install ffmpeg at here.According to this discussion ,I checked.
>> mediainfo ~/Desktop/grb_2.mp4
General
Complete name : /home/nyan/Desktop/grb_2.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 445 KiB
Duration : 27s 862ms
Overall bit rate : 131 Kbps
Encoded date : UTC 1904-01-01 00:00:00
Tagged date : UTC 1904-01-01 00:00:00
Writing application : Lavf57.66.105
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 27s 862ms
Bit rate : 128 Kbps
Width : 720 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Original display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) fps
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.012
Stream size : 435 KiB (98%)
Writing library : x264 core 148
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
Encoded date : UTC 1904-01-01 00:00:00
Tagged date : UTC 1904-01-01 00:00:00
ffmpeg -codecs | grep -i avc
ffmpeg version N-90982-gb995ec0 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
configuration: --prefix=/home/nyan/ffmpeg_build --enable-shared --extra-cflags=-I/home/nyan/ffmpeg_build/include --extra-ldflags=-L/home/nyan/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/nyan/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
libavutil 56. 18.100 / 56. 18.100
libavcodec 58. 19.100 / 58. 19.100
libavformat 58. 13.101 / 58. 13.101
libavdevice 58. 4.100 / 58. 4.100
libavfilter 7. 21.100 / 7. 21.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100
DEV.LS h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_v4l2m2m ) (encoders: libx264 libx264rgb h264_v4l2m2m h264_vaapi )
D.A.L. avc On2 Audio for Video Codec (decoders: on2avc )So my ffmpeg installation is ok.
When I cmake to my Opencv, I have set up to ffmpeg as
But when I make to compile, I have error as
make[2]: *** No rule to make target '/home/nyan/ffmpeg_build/lib/libavresample.a', needed by 'lib/libopencv_videoio.so.3.1.0'. Stop.
CMakeFiles/Makefile2:8709: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/all' failed
make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
Makefile:160: recipe for target 'all' failed
make: *** [all] Error 2How can I fix the problem ?
I install libavresample manually and
sudo apt-get install libavresample-dev
[sudo] password for nyan:
Reading package lists... Done
Building dependency tree
Reading state information... Done
libavresample-dev is already the newest version (7:2.8.14-0ubuntu0.16.04.1).It is newest version.
EDIT:Actually libavresample at ffmpeg is deprecated already.
So I tried to install Opencv3.4.1 higher version.
Compile, build and installation are fine.
ButVideoCapture cap(0);does not read from the device.
So I checked ffmpeg at Opencv3.4.1 installation aspython -c "import cv2; print(cv2.getBuildInformation())" | grep -i ffmpegFFMMPEG IS NO. So build with ffmpeg is not successful even though there was no error at build for Opencv3.4.1.
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