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Mot : - Tags -/Musique

Autres articles (21)

  • Gestion générale des documents

    13 mai 2011, par

    MédiaSPIP 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 (...)

  • Les vidéos

    21 avril 2011, par

    Comme les documents de type "audio", Mediaspip affiche dans la mesure du possible les vidéos grâce à la balise html5 .
    Un des inconvénients de cette balise est qu’elle n’est pas reconnue correctement par certains navigateurs (Internet Explorer pour ne pas le nommer) et que chaque navigateur ne gère en natif que certains formats de vidéos.
    Son avantage principal quant à lui est de bénéficier de la prise en charge native de vidéos dans les navigateur et donc de se passer de l’utilisation de Flash et (...)

  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

Sur d’autres sites (5589)

  • FFMPEG gets stuck on higher resolution or frame rate [H265]

    29 octobre 2015, par Anakooter

    I am running the following command which works perfectly on my system running Elementary OS on Intel Corei5 :

    ffmpeg -f v4l2 -i /dev/video0 -c:v libx265 -x265-params crf=14:vbv-maxrate=128:vbv-bufsize=32:keyint=10:qcomp=0.5:rd=5:ctu=64:min-cu-size=8:cu-lossless=false:fast-intra=false:strong-intra-smoothing=false -tune zerolatency -s 640x480 -preset ultrafast -r 5 -pix_fmt yuv420p -an -strict experimental -f mpegts udp://239.0.0.1:5002

    but if I change the output size to 800x600 and or increase the frame rate from 5 to 10. After a few seconds the video gets stuck.

    I have monitored the CPU usage for both the commands and it is almost identical that is between 300 to 400 percent ( since 4 cores ).

    Any possible answers to mitigate the issue.

    ffmpeg version 2.7.2-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2015 the FFmpeg developers
    
built with gcc 4.9.3 (Debian 4.9.3-1)
    
configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls --enable-libvidstab --enable-libsoxr --cc=gcc-4.9
    
libavutil      54. 27.100 / 54. 27.100
    
libavcodec     56. 41.100 / 56. 41.100
    
libavformat    56. 36.100 / 56. 36.100
    
libavdevice    56.  4.100 / 56.  4.100
    
libavfilter     5. 16.101 /  5. 16.101
    
libswscale      3.  1.101 /  3.  1.101
    
libswresample   1.  2.100 /  1.  2.100
    
libpostproc    53.  3.100 / 53.  3.100
    
Routing option strict to both codec and muxer layer
    
[video4linux2,v4l2 @ 0x4775460] fd:4 capabilities:84000001
    
Input #0, video4linux2,v4l2, from '/dev/video0':
    
Duration: N/A, start: 1223.904801, bitrate: 36864 kb/s
    
Stream #0:0: Video: rawvideo, 1 reference frame (YUY2 / 0x32595559), yuyv422, 320x240, 36864 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
    
[graph 0 input from stream 0:0 @ 0x476aae0] w:320 h:240 pixfmt:yuyv422     tb:1/1000000 fr:30/1 sar:0/1 sws_param:flags=2
    
[scaler for output stream 0:0 @ 0x476a920] w:800 h:600 flags:'0x4' interl:0
    
[scaler for output stream 0:0 @ 0x476a920] w:320 h:240 fmt:yuyv422 sar:0/1 -> w:800 h:600 fmt:yuv420p sar:0/1 flags:0x4
    
x265 [info]: HEVC encoder version 1.7+354-b2ba7df1fc69
    
x265 [info]: build info [Linux][GCC 4.9.3][64 bit] 8bit
    
x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
x265 [info]: Main profile, Level-3 (Main tier)
    
x265 [info]: Thread pool created using 4 threads
    
x265 [info]: frame threads / pool features       : 2 / wpp(10 rows)
    
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
    
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
    
x265 [info]: ME / range / subpel / merge         : dia / 57 / 0 / 2
    
x265 [info]: Keyframe min / max / scenecut       : 1 / 10 / 0
    
x265 [info]: Lookahead / bframes / badapt        : 0 / 0 / 0
    
x265 [info]: b-pyramid / weightp / weightb       : 0 / 0 / 0
    
x265 [info]: References / ref-limit  cu / depth  : 1 / 0 / 0
    
x265 [info]: Rate Control / qCompress            : CRF-14.0 / 0.50
    
x265 [info]: VBV/HRD buffer / max-rate / init    : 32 / 64 / 0.900
    
x265 [info]: tools: rd=5 psy-rd=0.30 early-skip tmvp deblock
    
[mpegts @ 0x4776b00] muxrate VBR, pcr every 1 pkts, sdt every 200, pat/pmt every 40 pkts
    
Output #0, mpegts, to 'udp://239.0.0.1:5002':
    
Metadata:
    
encoder         : Lavf56.36.100
    
Stream #0:0: Video: hevc (libx265), 1 reference frame, yuv420p, 800x600, q=2-31, 10 fps, 90k tbn, 10 tbc
    
Metadata:
    
encoder         : Lavc56.41.100 libx265
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (rawvideo (native) -> hevc (libx265))
    
Press [q] to stop, [?] for help
    
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*** 2 dup!
    
*** 555 dup!fps= 10 q=0.0 size=      86kB time=00:00:08.00 bitrate=  88.4kbits/s dup=21 drop=112    
    
x265 [warning]: poc:131, VBV underflow (-6152 bits)
    
x265 [warning]: poc:151, VBV underflow (-17080 bits)
    
x265 [warning]: poc:211, VBV underflow (-10272 bits)
    
x265 [warning]: poc:301, VBV underflow (-9024 bits)
    
x265 [warning]: poc:391, VBV underflow (-11368 bits)
    
x265 [warning]: poc:501, VBV underflow (-6152 bits)
    
x265 [warning]: poc:559, VBV underflow (-320 bits)
    
x265 [warning]: poc:581, VBV underflow (-16552 bits)
    
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*** 70055 dup!

  • How to compare two look alike videos of different codec, size, resolution

    23 octobre 2015, par Abdul Gafoor

    Is it possible to compare pragmatically, two look alike videos of different codec, size and resolution. I went through the some tools like ffmpeg opencv.

    Or in the another context, Lets an image should be compared with video and find out the exact time where the image visually present in the given video. The codecs, size and resolution of video and image may vary.

  • How to reduce the resolution of a video using ffmpeg ?

    6 septembre 2015, par testa abalez

    I want to reduce the resolution of a video from 1024*768 to 800*600.
    I found on the web ffmpeg, and the library swscale (I use in C.

    And I found some informations on the web, but nothing about how to reduce the resolution of a video nor about which functions to use

    How can I do ?

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