Recherche avancée

Sur d’autres sites (7363)

• sws_scale generates malformed video

  29 juillet 2024, par GiuTor

  I have to encode a series of frames from CAIRO_FORMAT_ARGB32 to AV_PIX_FMT_YUV420P with sws_scale. From the ffmpeg docs I came to know the AV equivalent of the source format is AV_PIX_FMT_ARGB so here is my code :

  


   // Set up conversion context
    img->sws_ctx = sws_getCachedContext(
        img->sws_ctx,
        img->video_size[0],
        img->video_size[1],
        AV_PIX_FMT_ARGB,
        img->video_size[0],
        img->video_size[1],
        AV_PIX_FMT_YUV420P,
        SWS_BILINEAR,
        NULL,
        NULL,
        NULL);

    width  = cairo_image_surface_get_width( surface );
    height = cairo_image_surface_get_height( surface );
    stride = cairo_image_surface_get_stride( surface );
    pix    = cairo_image_surface_get_data( surface );
    const int in_linesize[1] = { stride };
    
    sws_scale(  img->sws_ctx, (const uint8_t * const *) &pix, in_linesize, 0,
                img->video_size[1], img->video_frame->data, img->video_frame->linesize);
    img->video_frame->pts++;


  


  Sadly the video doesn't play and VLC shows a bunch of these useless messages :

  


  [h264 @ 0x7f6ce0cbc1c0] mmco: unref short failure
[h264 @ 0x7f6ce0c39a80] co located POCs unavailable
[h264 @ 0x7f6ce0c82800] co located POCs unavailable
[h264 @ 0x7f6ce0c9f400] mmco: unref short failure


  


  The encoding process runs just fine. I also tried with const int in_linesize[1] = 3 * width  ; Where am I wrong ?

  


• ffmpeg fade in animation and logo overlay in a single step

  24 octobre 2018, par Amin Baig

  I have the following commands to create a fade in effect with a series of images and then place a water mark png using the lut filter on the generated video :

  //Creating the fade in video :

  ffmpeg -t 5 -i 1.jpg -t 5 -i 2.jpg -t 5 -i 3.jpg -t 5 -i 4.jpg -i 5.jpg -filter_complex "[0:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=out:st=4:d=1[v0];[1:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v1];[2:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v2];[3:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v3];[4:v]zoompan=z='min(zoom+0.0015,1.5)':d=125,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v4];[v0][v1][v2][v3][v4]concat=n=5:v=1:a=0,format=yuva444p[v]" -map "[v]" -s "480x600" -t 40 series_out_fade_v2_5images.mp4

  After the video is created I use the following command to place a water mark logo over it :

  //Water mark

  ffmpeg -y -i series_out_fade_v2_5images.mp4 -i optimaken_logo.png -filter_complex "[1]lut=a=val*0.5[a];[0][a]overlay=0:0" -c:v libx264 -an v4_output.mp4

  my questions are :

  1. How can I achieve both in a single command
     2. How do I scale overlay proportionally so that the height of the water mark is always 65 pixels and the width is scaled
        proportionally
     3. Explicitly tell where to place the logo to the top right corner with a padding of 10 pixels for both x and y

• ffmpeg adds silence when used with input text file

  1er octobre 2022, par AncientToaster

  I'm using ffmpeg's concat option to combine a series of still images with an mp3 file. The total duration of my input.txt file is 12532 seconds, which is exactly the same as the total duration of my mp3 file (3:28:52, or 12532 seconds).

  


  But ffmpeg is adding 200 seconds of audio-free content to the end of the video. I've tried totaling and re-totaling the total duration of input.txt and it all seems to add up to the same amount. Including or excluding the -shortest flag also doesn't seem to matter.

  


  


  • ffmpeg command :

    


    ffmpeg -f concat -i input.txt -i input.mp3 -shortest -c:v libx264 -r 1 -pix_fmt yuv420p output.mp4


    


  


  • input.txt source

    


  


  • input.mp3

    


  


  • output file

    


  


  


  I'm having the same issue (differing amounts of time) with other videos.