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  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

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  • How can I capture audio AND video simultenaous with ffmpeg from an USB capture device

    5 octobre 2011, par oban

    I'm capturing a video by means of an USB Terratec Grabster AV350 (which is based on the em2860 chip).

    I don't succeed to get the audio when it is played . If I play the captured video with vlc or with ffplay I got only 3 seconds sound and then a silence for the rest of the video ...

    During the capturing I don't get any errors. At the end it indicates the size of the video and audio captured ....

    I'm using the ffmpeg command for this :

    ffmpeg -f alsa -ac 2 -i hw:3 -f video4linux2 -i /dev/video0 -acodec ac3 -ab 128k -vcodec mpeg4 -b 6000k -r 25 test5.avi

    The log is :

    [alsa @ 0x9bcd420]Estimating duration from bitrate, this may be inaccurate
    Input #0, alsa, from 'hw:3' :
    Duration : N/A, start : 69930.998994, bitrate : N/A
    Stream #0.0 : Audio : pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
    [video4linux2 @ 0x9bf5d30]Estimating duration from bitrate, this may be inaccurate
    Input #1, video4linux2, from '/dev/video0' :
    Duration : N/A, start : 1307111377.654173, bitrate : -2147483 kb/s
    Stream #1.0 : Video : rawvideo, yuyv422, 720x576, -2147483 kb/s, 1000k tbr, 1000k tbn, 1000k tbc
    [ac3 @ 0x9bf9590]No channel layout specified. The encoder will guess the layout, but it might be incorrect.
    Output #0, avi, to 'test5.avi' :
    Metadata :
    ISFT : Lavf52.64.2
    Stream #0.0 : Video : mpeg4, yuv420p, 720x576, q=2-31, 6000 kb/s, 25 tbn, 25 tbc
    Stream #0.1 : Audio : ac3, 44100 Hz, stereo, s16, 128 kb/s
    Stream mapping :
    Stream #1.0 -> #0.0
    Stream #0.0 -> #0.1
    Press [q] to stop encoding
    frame= 1283 fps= 25 q=2.3 Lsize= 38677kB time=51.32 bitrate=6173.9kbits/s
    video:37755kB audio:846kB global headers:0kB muxing overhead 0.198922%

    If I reduce the command for only capturing audio, then the audio file can be played successfully :

    ffmpeg -f alsa -ac 2 -i hw:3,0 -acodec ac3 -ab 128k test5.avi

    [alsa @ 0x8ede420]Estimating duration from bitrate, this may be inaccurate
    Input #0, alsa, from 'hw:3,0' :
    Duration : N/A, start : 70395.998935, bitrate : N/A
    Stream #0.0 : Audio : pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
    [ac3 @ 0x8eebac0]No channel layout specified. The encoder will guess the layout, but it might be incorrect.
    Output #0, avi, to 'test5.avi' :
    Metadata :
    ISFT : Lavf52.64.2
    Stream #0.0 : Audio : ac3, 44100 Hz, stereo, s16, 128 kb/s
    Stream mapping :
    Stream #0.0 -> #0.0
    Press [q] to stop encoding
    size= 227kB time=13.62 bitrate= 136.8kbits/s
    video:0kB audio:213kB global headers:0kB muxing overhead 6.902375%

    If I run the command for only video capturing then vlc or ffplay can play the video successfully :

    ffmpeg -f video4linux2 -i /dev/video0 -vcodec mpeg4 -b 12000k -r 25 test5.avi

    [video4linux2 @ 0x91d6420]Estimating duration from bitrate, this may be inaccurate
    Input #0, video4linux2, from '/dev/video0' :
    Duration : N/A, start : 1307112044.025687, bitrate : -2147483 kb/s
    Stream #0.0 : Video : rawvideo, yuyv422, 720x576, -2147483 kb/s, 1000k tbr, 1000k tbn, 1000k tbc
    Output #0, avi, to 'test5.avi' :
    Metadata :
    ISFT : Lavf52.64.2
    Stream #0.0 : Video : mpeg4, yuv420p, 720x576, q=2-31, 12000 kb/s, 25 tbn, 25 tbc
    Stream mapping :
    Stream #0.0 -> #0.0
    Press [q] to stop encoding
    frame= 388 fps= 25 q=2.0 Lsize= 12963kB time=15.52 bitrate=6842.5kbits/s
    video:12949kB audio:0kB global headers:0kB muxing overhead 0.114584%

    Strange behaviour I noticed is that when I tried capturing video and audio, I can not capture the audio afterwards any more,
    unless I unplug the AV350 first.

    The G350 is located at card 3 :

    htpc@htpc-01 :/proc/asound/G350/pcm0c$ more info
    card : 3
    device : 0
    subdevice : 0
    stream : CAPTURE
    id : USB Audio
    name : USB Audio
    subname : subdevice #0
    class : 0
    subclass : 0
    subdevices_count : 1
    subdevices_avail : 1

    The OS is a Linux 2.6.38-8-generic with the Ubuntu Natty Narwhal version

    Any help on how to tackle this issue would be great ....

    Thanks !

  • How to encode grayscale video streams with FFmpeg ?

    26 octobre 2014, par Gearoid Murphy

    I’ve got a grayscale video stream coming off a Firewire astronomy camera, I’d like to use FFmpeg to compress the video stream but it will not accept single byte pixel formats for the MPEG1VIDEO codecs. How can I use the FFmpeg API to convert grayscale video frames into a frame format accepted by FFmpeg ?

  • Video encoding from a file which is being creating from another recorder program

    3 décembre 2011, par John Smith

    well, this is an extreme question. There's a screen capturer program which records video to a file (only this program can record from the target application !) and I would like to stream it with FFmpeg by UPD/TCP.
    The question is how to encode a file what is being writing. Sadly that program creates big file and not seems to be accept any way to change encodings.

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