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  • Keeping control of your media in your hands

    13 avril 2011, par

    The 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 (...)

  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
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  • Script d’installation automatique de MediaSPIP

    25 avril 2011, par

    Afin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
    Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
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Sur d’autres sites (12678)

  • Why duration of the mp4 file created with ffmpeg from png files is smaller than expected ?

    17 août 2021, par qwark97

    I'm trying to concatenate a bunch of png files into one mp4 file using ffmpeg. I use following command :

    


    ffmpeg -f concat -i concat.txt -f mp4 out.mp4


    


    The "description file" (concat.txt) looks like this :

    


    file screen_001.png
duration 0.14538311958312988
file screen_002.png
duration 0.11382007598876953
file screen_003.png
duration 2.543360710144043
...
file screen_036.png
duration 0.15303301811218262
file screen_037.png
duration 0.160630464553833
file screen_038.png
duration 3.2751874923706055


    


    Given command works, I'm able to create desired mp4 file. The problem is, the duration of the output file is smaller than sum of the duration lines from concat.txt. I expect mp4 file 22.48s long but I get 19.20s long file.

    


    What am I doing wrong ? Maybe I'm not using some flag I should ? Is it even possible to do what I want ? I'm kind a newbie with ffmpeg and video manipulation at all so any help would be appreciated.

    


    Output of the ffmpeg, maybe will be useful :

    


    root@65181939e08e:/files/tmp# ffmpeg -f concat -i concat.txt -f mp4 out.mp4
ffmpeg version 4.1.6-1~deb10u1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --prefix=/usr --extra-version='1~deb10u1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, concat, from 'concat.txt':
  Duration: 00:00:22.48, start: 0.000000, bitrate: 0 kb/s
    Stream #0:0: Video: png, rgba(pc), 1366x768, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x5651f1a6e8c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x5651f1a6e8c0] profile High 4:4:4 Predictive, level 3.2, 4:4:4 8-bit
[libx264 @ 0x5651f1a6e8c0] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 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
Output #0, mp4, to 'out.mp4':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 1366x768, q=-1--1, 25 fps, 12800 tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.35.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=  483 fps=199 q=-1.0 Lsize=     258kB time=00:00:19.20 bitrate= 110.2kbits/s dup=445 drop=0 speed=7.89x    
video:252kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.564829%
[libx264 @ 0x5651f1a6e8c0] frame I:5     Avg QP: 7.86  size: 28761
[libx264 @ 0x5651f1a6e8c0] frame P:121   Avg QP:14.58  size:   729
[libx264 @ 0x5651f1a6e8c0] frame B:357   Avg QP:13.34  size:    70
[libx264 @ 0x5651f1a6e8c0] consecutive B-frames:  1.2%  0.0%  1.9% 96.9%
[libx264 @ 0x5651f1a6e8c0] mb I  I16..4: 88.2%  0.0% 11.8%
[libx264 @ 0x5651f1a6e8c0] mb P  I16..4:  1.3%  0.0%  0.3%  P16..4:  0.2%  0.0%  0.0%  0.0%  0.0%    skip:98.1%
[libx264 @ 0x5651f1a6e8c0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.9%  0.0%  0.0%  direct: 0.0%  skip:99.1%  L0:59.4% L1:40.6% BI: 0.0%
[libx264 @ 0x5651f1a6e8c0] coded y,u,v intra: 7.9% 0.7% 1.3% inter: 0.0% 0.0% 0.0%
[libx264 @ 0x5651f1a6e8c0] i16 v,h,dc,p: 81% 18%  1%  0%
[libx264 @ 0x5651f1a6e8c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 28% 22%  2%  3%  3%  3%  3%  3%
[libx264 @ 0x5651f1a6e8c0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x5651f1a6e8c0] ref P L0: 72.5% 11.9% 12.4%  3.1%
[libx264 @ 0x5651f1a6e8c0] ref B L0: 50.4% 48.1%  1.4%
[libx264 @ 0x5651f1a6e8c0] ref B L1: 98.9%  1.1%
[libx264 @ 0x5651f1a6e8c0] kb/s:106.45


    


    Thanks for your help !

    


  • How to set source port number, in ffmpeg and udp protocol ?

    18 janvier 2021, par Rasoul Sharifian

    I am using FFmpeg library to send webcam frames through udp protocol for my destination.

    


    My command line is :

    


    ffmpeg -f dshow -i  video="Lenovo EasyCamera" -vcodec libx264  -f mpegts udp://192.168.30.20:8080   


    


    My problem is on the receiver side, where we can not distinguish the source port number.
Is there any command line to set the source port number ?

    


    Thanks a lot

    


  • Why do some methods end with a number in ffmpeg

    20 mars 2020, par jinux

    Why do some methods end with a number in ffmpeg such as avcodec_alloc_context3()

    I google it and look over the ffmpeg development conversion, but can’t find the result

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