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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 (...)

  • Les images

    15 mai 2013

  • Taille des images et des logos définissables

    9 février 2011, par

    Dans beaucoup d’endroits du site, logos et images sont redimensionnées pour correspondre aux emplacements définis par les thèmes. L’ensemble des ces tailles pouvant changer d’un thème à un autre peuvent être définies directement dans le thème et éviter ainsi à l’utilisateur de devoir les configurer manuellement après avoir changé l’apparence de son site.
    Ces tailles d’images sont également disponibles dans la configuration spécifique de MediaSPIP Core. La taille maximale du logo du site en pixels, on permet (...)

Sur d’autres sites (7449)

  • Crackling noise and other audio defects when live streaming (only) on YouTube

    7 août 2020, par almosnow

    I am using ffmpeg to transcode and stream a live video, using rtmp. Everything works fine BUT the audio that comes out on the YouTube end has cracks and pops, like what you would expect to hear when your sound card's buffer is saturated.

    


    What's weird is that I am sending the exact same information to different services, and only YouTube seems to have a problem with it. For this I am using ffmpeg's tee, like this :

    


    ffmpeg -i - -deinterlace -map 0 -flags +global_header 
       -f tee "[f=flv:onfail=ignore]rtmp://twitch/key|[f=flv:onfail=ignore]rtmp://youtube/key|out.flv"'


    


    So, the twitch end sounds great, the output file that I'm rendering also sounds good. Only on YouTube it sounds really bad.

    


    I thought it may be the audio codec, the audio settings I'm using are -c:a aac -b:a 128k -ar 44100 ; but I've tried different things (using an mp3 codec, different bitrates) and it always sounds like that. Also AAC seems to be supported according to their own (YT) guidelines.

    


    What could it be ?

    


  • How can I synchronize a method call with alsa playback ?

    23 novembre 2015, par modwizcode

    I’m trying to write a program that will synchronize lights to playback of a basic wav file. I’ve struggled through all the alsa docs, the source for ffplay.c and searched around on the internet, but it’s difficult to figure out how to do what seems like a common and simple task.

    Basically I want to do two things, the first is to read keypress events while the audio is playing and store the offsets in a file. The second is take those queue files and load them later, this time on a different audio device like a raspberry pi.

    I’m struggling with how to first account for the latency in the initial capture of the offset positions and then how to handle that latency when I playback on a completely different hardware device.

    I know snd_pcm_delay() is used by the ffmpeg suite to deal with some of this, but I’m really struggling with even the basic technique. It’s not a complicated playback mechanism, just a blocking write in a loop.

    I’d post some code, but I don’t have it with me at the moment and it’s just a mess of the current hacks that aren’t working.

  • avformat/mov : Break out of inner loop early in mov_estimate_video_delay()

    11 juillet 2018, par Michael Niedermayer
    avformat/mov : Break out of inner loop early in mov_estimate_video_delay()

    0.266 <- 0.299 sec (this is time ffmpeg so containing alot other things)
    

    Sample for benchmark was : ffmpeg -f rawvideo -pix_fmt yuv420p -s 32x32 -i /dev/zero -t 24:00:00.00 out.mp4
    

    Reviewed-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
    
Reviewed-by : Sasi Inguva <isasi@google.com>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavformat/mov.c

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