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  • Mise à jour de la version 0.1 vers 0.2

    24 juin 2013, par

    Explications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
    Au niveau des dépendances logicielles Utilisation des dernières versions de FFMpeg (>= v1.2.1) ; Installation des dépendances pour Smush ; Installation de MediaInfo et FFprobe pour la récupération des métadonnées ; On n’utilise plus ffmpeg2theora ; On n’installe plus flvtool2 au profit de flvtool++ ; On n’installe plus ffmpeg-php qui n’est plus maintenu au (...)

  • Personnaliser en ajoutant son logo, sa bannière ou son image de fond

    5 septembre 2013, par

    Certains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;

  • Ecrire une actualité

    21 juin 2013, par

    Présentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
    Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
    Vous pouvez personnaliser le formulaire de création d’une actualité.
    Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...)

Sur d’autres sites (9957)

  • Changing bit-rate with timestamp copy still offsets events by 1 or 2 frames

    10 avril 2018, par harkmug

    As a novice user, I am trying to understand the following. I have an mp4 (encoder=Lavf57.66.104) that is 127 MB in size and I use the following to reduce its size :

    ffmpeg -i original.mp4 -start_at_zero -copyts -b:v 1000k -c:a copy output.mp4

    The duration and number of frames stay the same after this process, however, when I annotate (using ELAN) the same events (at millisecond level, e.g. a blink) the output video (encoder=Lavf57.55.100) seems to be offset relative to the original by 1 or 2 frames.

    Can someone help me understand this shift ? Thanks !

    UPDATE (2018-04-10) :
    As per @Mulvya’s suggestion, ran :

    ffmpeg -i original.mp4 -copyts -b:v 1000k -c:a copy output.mp4

    Looking at the two files :

    fprobe -v error -select_streams v:0 -show_frames -show_entries frame=key_frame,pkt_pts_time,pict_type,coded_picture_number -of default=noprint_wrappers=1:nokey=1 -of csv=p=0 original.mp4 | head -n 5
    

    
1,5292.861000,I,0
    
0,5292.894333,P,1
    
0,5292.927667,P,2
    
0,5292.961000,P,3
    
0,5292.994333,P,4

    Same for output :

    1,5292.866016,I,0
    
0,5292.899349,P,1
    
0,5292.932682,P,2
    
0,5292.966016,P,3
    
0,5292.999349,P,4

    Trying to understand how to get the same time-stamps for the same frames. Maybe this is not possible ?

  • FFMpeg mixing audio to video creates silent video after audio is added,

    25 mars 2018, par 1234567

    mixing audio to video creates silent video after audio is added, using FFMpeg

    this is the command I am using

    "-y","-i",j,"-filter_complex","amovie="+audio+":loop=999,asetpts=N/SR/TB,atrim=0:18,adelay=50000|50000,aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=1.5[a1];[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=2.0[a2];[a1][a2]amerge,pan=stereo:c0code>

    I have a video which is 2 mins 7 seconds ling, I want to ’mix’ audio to a part starting from 50 seconds to 68 seconds

    What i want is to keep original sound from video and mix audio to existing sound of video(not over write) it, (keep old video sound and new audio in video)

    what happens is till 50 seconds video has its own sound, from 50 -68 the audio over writes the video sound and from then till end it is silent

    what i want is video to have its sound through out the video and mix from 50 -68 seconds the audio to it

    this graphic can explain a bit of what i want and what i am getting

    What i want enter image description here
    what i am gettingenter image description here
    another problem that I am facing is
    if i try this on a silent video (video with no sound at all) this code fails this is the error that I am getting

    ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 4.8 (GCC)
    
  configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
    
  libavutil      55. 17.103 / 55. 17.103
    
  libavcodec     57. 24.102 / 57. 24.102
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 31.100 /  6. 31.100
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/sdcard0/abcd/Videos/20180325_164206.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: isommp42
    
    creation_time   : 2018-03-25 16:44:15
    
  Duration: 00:02:05.21, start: 0.000000, bitrate: 1585 kb/s
    
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x1280, 1584 kb/s, SAR 1:1 DAR 9:16, 11.83 fps, 90k tbr, 90k tbn, 180k tbc (default)
    
    Metadata:
    
      creation_time   : 2018-03-25 16:44:15
    
      handler_name    : VideoHandle
    
[mp3 @ 0xaca26b40] Skipping 0 bytes of junk at 417.
    
[Parsed_pan_9 @ 0xac9b17e0] This syntax is deprecated. Use '|' to separate the list items.
    
Stream specifier ':a' in filtergraph description amovie=/storage/sdcard0/abcd/Videos/baby.mp3:loop=999,asetpts=N/SR/TB,atrim=0:18,adelay=50000|50000,aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=1.5[a1];[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=2.0[a2]; [a1][a2]amerge,pan=stereo:c0code>

    how can we add audio to a silent video

  • Transparent PNG to WEBM

    5 avril 2018, par Dan

    I am trying to make a partially transparent video for a Unity application, however, I can’t seem to get my commands to retain the alpha of the PNGs. Instead, it just makes the transparent parts white.

    Currently the command I am using is

    ffmpeg -r 30 -f image2 -s 2048x2048 -i frames%04d.png -vcodec vp8 -crf 63 -b:v 0 -pix_fmt yuva420p -auto-alt-ref 0 vid/output.webm

    Whilst I am aware I could try the VP9 codec, AFAIK, this is not supported in Unity 2017.2, so I have to stick to VP8

    The output this gives is

    D:\development\batch - Copy>ffmpeg -r 30 -f image2 -s 2048x2048 -i frames%04d.png -vcodec vp8 -crf 63 -b:v 0 -pix_fmt yuva420p -auto-alt-ref 0 vid/output.webm
    
ffmpeg version N-90315-gf706cdda56 Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 7.3.0 (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-libopencore-amrnb --enable-libopencore-amrwb --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-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
    
  libavutil      56.  9.100 / 56.  9.100
    
  libavcodec     58. 14.100 / 58. 14.100
    
  libavformat    58. 10.100 / 58. 10.100
    
  libavdevice    58.  2.100 / 58.  2.100
    
  libavfilter     7. 13.100 /  7. 13.100
    
  libswscale      5.  0.102 /  5.  0.102
    
  libswresample   3.  0.101 /  3.  0.101
    
  libpostproc    55.  0.100 / 55.  0.100
    
Input #0, image2, from 'frames%04d.png':
    
  Duration: 00:00:03.50, start: 0.000000, bitrate: N/A
    
    Stream #0:0: Video: png, pal8(pc), 2048x2048, 30 fps, 30 tbr, 30 tbn, 30 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (png (native) -> vp8 (libvpx))
    
Press [q] to stop, [?] for help
    
[libvpx @ 00000209d9a6e680] v1.7.0
    
Output #0, webm, to 'vid/output.webm':
    
  Metadata:
    
    encoder         : Lavf58.10.100
    
    Stream #0:0: Video: vp8 (libvpx), yuva420p, 2048x2048, q=-1--1, 30 fps, 1k tbn, 30 tbc
    
    Metadata:
    
      encoder         : Lavc58.14.100 libvpx
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
frame=  105 fps=4.1 q=0.0 Lsize=     144kB time=00:00:03.46 bitrate= 339.6kbits/s speed=0.134x
    
video:94kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 52.357399%

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