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Autres articles (79)

  • 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.

  • 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 (...)

  • De l’upload à la vidéo finale [version standalone]

    31 janvier 2010, par

    Le chemin d’un document audio ou vidéo dans SPIPMotion est divisé en trois étapes distinctes.
    Upload et récupération d’informations de la vidéo source
    Dans un premier temps, il est nécessaire de créer un article SPIP et de lui joindre le document vidéo "source".
    Au moment où ce document est joint à l’article, deux actions supplémentaires au comportement normal sont exécutées : La récupération des informations techniques des flux audio et video du fichier ; La génération d’une vignette : extraction d’une (...)

Sur d’autres sites (8375)

  • How to play a specific number of samples from an audio file using ffmpeg ?

    2 juillet 2023, par FrostDream

    I'm trying to use ffmpeg in a command-line or terminal environment to play only a specific number of samples from an audio file. Instead of playing the entire audio, I want to extract and play a precise portion based on the sample count.

    


    I came across the following example command that seems to be relevant :

    


    ffmpeg -ss 0 -t [SAMPLE_COUNT] -i [INPUT_AUDIO_FILE] -f wav - | ffplay -


    


    In the command, I understand that -ss is used to specify the start time as 0, -t sets the duration as the sample count, -i defines the input audio file, and -f sets the output format as WAV. The output is then piped to ffplay, a simple media player provided with ffmpeg, which will play the specified number of samples from the audio file.

    


    However, I'm not entirely sure about the usage and options of ffmpeg in this scenario. Could someone please provide a detailed explanation of how to correctly use ffmpeg to achieve this ? Any additional insights, tips, or alternative approaches would also be greatly appreciated. Thank you !

    


  • Encoded mp4 video won't play in Firefox v33

    3 novembre 2014, par Michael Heuberger

    When this video is encoded with the following ffmpeg command, it cannot be played in Firefox v33 (a blank screen appears). But when I play it in the native VLC player, it works. So here the long ffmpeg command :

    $ ffmpeg -r 15 -f image2 -i /home/(...)/frames/%d.jpg -i
    
  /home/(...)/preview.wav -y -acodec libfdk_aac -b:a 128k 
    
  -vcodec libx264 -b:v 386k -preset ultrafast -profile:v baseline 
    
  -crf 6 -pix_fmt yuv420p -loglevel warning -movflags faststart 
    
  /home/(...)/preview.mp4

    As you can see, preview.mp4 is encoded by a sequence of jpg images with a given wav file.

    The ffmpeg output is just this

    [wav @ 0x35ff460] Estimating duration from bitrate, this may be inaccurate
    
Guessed Channel Layout for  Input Stream #1.0 : mono
    
[swscaler @ 0x35f0d80] deprecated pixel format used, make sure you did set range correctly

    Any clues why it won’t play on Firefox (and what the other ffpmeg warnings mean) ?

    Thanks !!!

  • MPEG4 X264 vs NVENC H264 encoding play compatibility on old devices

    28 mars 2021, par Root

    I always encoding videos on x264, this encoding work well on old devices or mobile phones.
    
To increase the encoding speed I try to replace encoding method with NVENC H264 with nVidia GPU.

    


    Question 1 : Device combability for play the NVENC H264 is different with x264 ?
    
Question 2 : Old devices can play NVENC H264 file same as x264 ?

    


    Old devices : (All devices that can play x264) Android 6+, TV Setup box, TV, Google chrome 48+

    


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