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Sur d’autres sites (6092)

  • 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 ?

  • Best way to combine 16 live streams into a live 4x4 collage within Linux [duplicate]

    13 mars 2013, par CoryG

    This question already has an answer here :

    I'm setting up a CCTV system with two 8ch capture cards in a Linux box and am looking for the most efficient way to combine all 16 channels into a 4x4 grid and send it straight to the VGA output of a machine. Is this possible without running a window manager - and if not what is the best way to handle this ? So far I'm leaning toward ffmpeg but am not sure how best to combine the streams.

  • Modify GIF89A file header

    6 juillet 2013, par jdevelop

    Is there any library, which can take existing animated GIF file and set/unset loop count and loop flag ? I have couple of GIF files produced by FFMPEG, and it seems not possible to set loop/loop count flags to FFMPEG. So need some sort of post-processing of GIF images.

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