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Autres articles (41)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Contribute to a better visual interface

    13 avril 2011

    MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
    Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community.

  • Submit enhancements and plugins

    13 avril 2011

    If you have developed a new extension to add one or more useful features to MediaSPIP, let us know and its integration into the core MedisSPIP functionality will be considered.
    You can use the development discussion list to request for help with creating a plugin. As MediaSPIP is based on SPIP - or you can use the SPIP discussion list SPIP-Zone.

Sur d’autres sites (8824)

  • avformat/rtpdec : Fix prft wallclock time.

    25 mars 2021, par Alok Priyadarshi
    avformat/rtpdec : Fix prft wallclock time.

    Timestamp difference is available in media timebase (1/90K) where as
    
rtcp time is in the default microseconds timebase. This patch fixes
    
the calculated prft wallclock time by rescaling the timestamp delta
    
to the microseconds timebase.
    

    Signed-off-by : James Almer <jamrial@gmail.com>
    • [DH] libavformat/rtpdec.c

  • How can I calculate the audio time by byte position (bytes to secounds) ?

    10 avril 2020, par coding-scripting

    I have the audio file and byte range. I want get time for each byte position. I'm use php.

    &#xA;&#xA;

    I tried to calculate that using this formula : $time = $byte/($bitRate * $sampleRate * $cannels)&#xA;But it doesn't work.

    &#xA;&#xA;

    So how can I calculate this ? I used ffmpeg (php-ffmpeg), and if you know how to find this data with ffmpeg, that would be fine ;

    &#xA;

  • ffmpeg get frame time stamp

    19 novembre 2018, par Anshul G.

    I am trying to record a webcam video using ffmpeg. I have a logitech c922 Pro Stream Webcam. This is the command that I use :

    ffmpeg -f v4l2 -framerate 60 -video_size 1280x720 -input_format mjpeg -i /dev/video1 out.mp4

    My application requires me to get the exact timestamp for every frame. While I could use my knowledge of the framerate and frame number to add the required interval to the start time, I am afraid that this might not be completely accurate.

    Firstly, I have noticed that while recording, the console seems to initially display a far higher fps than the one I have set :

    Press [q] to stop, [?] for help
    
frame=  177 fps= 85 q=-1.0 Lsize=     502kB time=00:00:02.91 bitrate=1410.8kbits/s dup=144 drop=0    

    Also, I think that ffmpeg drops frames in between sometimes.

    However, my videos seem to have the correct number of frames so I think that the fps value displayed could instead be referring to the encoding/ decoding speed. I am not sure about frame dropping.

    I would be happy of you could let me know what you think, or suggest an alternative so that I can timestamp my frames accurately. Thanks !

    Edit :

    I have understood that frame rate is correlated to ambient light which can lead to high duplication in frames. I am currently recording on windows and have set frame rate as the priority in logitech gaming software. However there is still the occasional drop in frame or duplication. Does this affect time stamp of the frames ? Or can I extrapolate from the start time ?

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