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Autres articles (58)

  • 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.

  • L’espace de configuration de MediaSPIP

    29 novembre 2010, par

    L’espace de configuration de MediaSPIP est réservé aux administrateurs. Un lien de menu "administrer" est généralement affiché en haut de la page [1].
    Il permet de configurer finement votre site.
    La navigation de cet espace de configuration est divisé en trois parties : la configuration générale du site qui permet notamment de modifier : les informations principales concernant le site (...)

  • 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.

Sur d’autres sites (9191)

  • Why frame->pts increases by 20, rather than by 1 ?

    19 mars 2013, par user1914692

    Following the exmaples of ffmpeg : decoding_encoding.c and filtering_video.c, I process one video file taken by iPhone. The video file : .mov, video dimensions ; 480x272, video Codec : H.264/AVC, 30 frames per second, bitrate : 605 kbps.

    I first extract each frame, which is YUV.
    I convert YUV to RGB24, and process the RGB24, then write the RGB24 to a .ppm file. It shows the .ppm file is correct.

    Then I plan to encode processed RGB24 frames to a video file.
    Since MPEG does not support RGB24 picture format, I used AV_CODEC_ID_HUFFYUV.
    But the output video file (showing 18.5 MB) does not play. Movie Player on Ubuntu claims an error : Could not determine type of stream.
    I also tried it on VCL. It simply does not work, without any error information.

    My second questions is :
    For each extracted fram from the input video file, I get its pts as follows according to filtering_video.c :

    frame->pts = av_frame_get_best_effort_timestamp(frame);

    I print out each frame's pts, and find that it increases by 20, like below :

    pFrameRGB_count: 0,  frame->pts: 0
    
pFrameRGB_count: 1,  frame->pts: 20
    
pFrameRGB_count: 2,  frame->pts: 40
    
pFrameRGB_count: 3,  frame->pts: 60

    Where frame is the extracted frame from the input video, and pFrameRGB_count is the count for processed frame in RGB24 form.

    Why are they wrong ?

  • FFMPEG Conversion Options [migrated]

    7 mars 2013, par Mike

    So, I've got some video files I want to convert so they match the formatting on another video file. I've got the format data (from ffprobe) for the video I want to match but I'm not sure how to use that to determine the options to convert my other videos. Any help ?

    Here are the settings on the file I want to match from ffprobe :

        Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clip #19.mov':
    
      Metadata:
    
        major_brand     : qt  
    
        minor_version   : 537199360
    
        compatible_brands: qt  
    
        creation_time   : 2013-03-05 22:27:26
    
      Duration: 00:15:00.00, start: 0.000000, bitrate: 119406 kb/s
    
        Stream #0:0(eng): Video: prores (apcn / 0x6E637061), yuv422p10le, 1440x1080, 117804 kb/s, SAR 4:3 DAR 16:9, 29.97 fps, 29.97 tbr, 2997 tbn, 2997 tbc
    
        Metadata:
    
          creation_time   : 2013-03-05 22:27:26
    
          handler_name    : Apple Alias Data Handler
    
          timecode        : 00:00:00;00
    
        Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 2 channels, s16, 1536 kb/s
    
        Metadata:
    
          creation_time   : 2013-03-05 22:27:26
    
          handler_name    : Apple Alias Data Handler
    
        Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
    
        Metadata:
    
          creation_time   : 2013-03-05 22:27:26
    
          handler_name    : Apple Alias Data Handler
    
          timecode        : 00:00:00;00
    
    Unsupported codec with id 0 for input stream 2

    Any help would be greatly appreciated. Thanks.

  • Defining moment of the audio attenuation through ffmpeg

    23 août 2016, par riki-tik

    There are audio tracks of different lengths in m4a format. And there’s ffmpeg library for working with the media. Many of the tracks have the effect of "decay" in the end, and it is necessary to determine at what point it occurs (determined once and the value entered in the database along with other information about the track). Those. we must somehow determine that the track begins to fade, and its volume reached 30% compared to the total volume of the song. Is it possible to solve by means of ffmpeg, and if so, how ?

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