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  • 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 (...)

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

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  • What kind of stream GStreamer produce ?

    16 novembre 2014, par Max

    I use following 2 commands to stream video from Raspberry Pi

    RaPi

    raspivid -t 999999 -h 720 -w 1080 -fps 25 -hf -b 2000000 -o - | gst-launch-1.0 -v fdsrc ! h264parse !  rtph264pay config-interval=1 pt=96 ! gdppay ! tcpserversink host=$RA-IP-ADDR port=5000

    Linux Box

    gst-launch-1.0 -v tcpclientsrc host=$RA-IP-ADDR port=5000  ! gdpdepay !  rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

    But what kind of stream is it ? Can I read it with OpenCV ? or convert with avconv|ffmpeg nc $RA-IP-ADDR 5000 | avconv ? or watch with VLC ?

  • How to extract raw YUV files from MPEG2 TS file ?

    11 septembre 2012, par Wang Wei

    I have a 1920x1080 mpeg2 .ts file. I need to get the raw YUV files for each frame.
    I tried ffmpeg but no luck. I end up with many small files. I expect each frame to be 1920x1080x1.5 = 3110400 Bytes.

    [root@dwarch frames]# ffmpeg -i video.ts -f image2 foo-%03d.yuv
    
FFmpeg version git-N-28713-g65daa94, Copyright (c) 2000-2011 the FFmpeg developers
    
  built on Mar 30 2011 09:20:16 with gcc 4.6.0
    
  configuration: --prefix=/usr --enable-gpl --enable-libmp3lame --enable-libvorbis --enable-libfaac --enable-libxvid --enable-libx264 --enable-libvpx --enable-libtheora --enable-postproc --enable-shared --enable-x11grab --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libschroedinger --enable-libopenjpeg --enable-version3 --enable-nonfree --enable-runtime-cpudetect --disable-debug
    
  libavutil    50. 40. 0 / 50. 40. 0
    
  libavcodec   52.116. 0 / 52.116. 0
    
  libavformat  52.104. 0 / 52.104. 0
    
  libavdevice  52.  4. 0 / 52.  4. 0
    
  libavfilter   1. 76. 0 /  1. 76. 0
    
  libswscale    0. 13. 0 /  0. 13. 0
    
  libpostproc  51.  2. 0 / 51.  2. 0
    
Input #0, mpegts, from 'video.ts':
    
  Duration: 00:04:51.58, start: 0.333333, bitrate: 36041 kb/s
    
  Program 10 
    
    Stream #0.0[0x20]: Video: mpeg2video (Main), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 35000 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
    
    Stream #0.1[0x21]: Audio: ac3, 48000 Hz, 5.1, s16, 224 kb/s
    
Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting format 'yuvj420p'
    
[buffer @ 0x97148c0] w:1920 h:1080 pixfmt:yuv420p
    
[setdar @ 0x9714df0] a:16/9
    
[setdar @ 0x9714df0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'Parsed filter 0 setdar'
    
[scale @ 0x9711db0] w:1920 h:1080 fmt:yuv420p -> w:1920 h:1080 fmt:yuvj420p flags:0x4
    
[setdar @ 0x9714df0] w:1920 h:1080 -> dar:16/9 sar:1/1
    
Output #0, image2, to 'foo-%03d.yuv':
    
  Metadata:
    
    encoder         : Lavf52.104.0
    
    Stream #0.0: Video: mjpeg, yuvj420p, 1920x1080 [PAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 23.98 tbc
    
Stream mapping:
    
  Stream #0.0 -> #0.0

  • speeding up x264 encoding (C++ code with libavcodec)

    20 décembre 2012, par Hrishikesh_Pardeshi

    I am trying to capture windows screen (continuous screen shots) and encode them into x264. For that I am using avcodec_encode_video2 function available with libavcodec. However, it takes a huge amount of time. The time fluctuates between 25 – 1800 milliseconds for encoding individual frames.

    I tried tried both 1080p and 720p with video recording on screen.

    These are the settings I am using. This was tested on Windows 7, win32 release build with 4 GB of RAM.

    bit_rate = 2000, width = 1920, height = 1080
    qmin = 0, qmax = 0, max_b_frames = 0, frame_rate = 25, pixel_format = YUV 4:4:4.
    The remaining settings are default which are fetched using avcodec_get_context_defaults3().

    Sample data(in milliseconds) for 20 frames (consecutive and chosen randomly) in a set of 250 frames.
    121, 106, 289, 126, 211, 30, 181, 58, 213, 34, 245, 50, 56, 364, 247, 171, 254, 83, 82, 229

    For the application it is a must that it captures at least at 15 fps. Can someone help out to tell whether any options can be used to improve the frame rate. I need to encode lossless, but I am open to some file size increase.

    Thanks in advance.

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