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• how to merge 2 videos by Fade In and Fade out effects in swift

  9 novembre 2017, par PRITAM SATPUTE

  I need to merge 2 videos with effects like Fade In or Fade out or cross fade etc.
  How can I achieve it ?

  Got solutions like use ffmpeg. Let me know how can we implement it ?
  How can we use ffmpeg in ios or any other solution ?

• ffmpeg error : parsed_overlay framesync - Buffer queue overflow, dropping

  23 octobre 2014, par Tom

  On most video files my ffmpeg command works fine. but on some video files I get the following error code. something goes wrong with scaling and overlaying filters. but it depends on input files. I’m still searching for reasons and solutions. Maybe somebody knows more about it ?

      [Parsed_overlay_1 @ *] [framesync @ *] Buffer queue overflow, dropping." 

  Input :

    ffmpeg 
  
    -i "/var/www/vhosts/domain.com/httpdocs/video/temp/input.wmv" 
  
    -i "/var/www/vhosts/domain.com/httpdocs/images/logo_w140.png" 
  
    -filter_complex 'scale=trunc(oh*a/2)*2:320,overlay=main_w-overlay_w-10:main_h-overlay_h-10' 
  
    -ss 00:00:00 -t 00:00:44 -r 24 -b:v 360k -bt 416k -vcodec libx264 
  
    -preset veryslow -ar 11025 -y -acodec libfaac -ac 1 -ab 64k 
  
    /var/www/vhosts/domain.com/httpdocs/Protected/41000/output.mp4

  Output :

    ffmpeg version 2.3.2 Copyright (c) 2000-2014 the FFmpeg developers
  
      built on Aug 13 2014 16:39:32 with gcc 4.4.5 (Debian 4.4.5-8)
  
      configuration: --enable-avfilter --enable-libmp3lame --enable-shared --disable-mmx --arch=x86_64 --enable-libfaac --enable-nonfree --enable-filter=movie --enable-libx264 --enable-gpl --enable-version3 --enable-postproc --enable-libvorbis --enable-libx264 --enable-x11grab --prefix=/usr --enable-libgsm --enable-libdc1394
  
      libavutil      52. 92.100 / 52. 92.100
  
      libavcodec     55. 69.100 / 55. 69.100
  
      libavformat    55. 48.100 / 55. 48.100
  
      libavdevice    55. 13.102 / 55. 13.102
  
      libavfilter     4. 11.100 /  4. 11.100
  
      libswscale      2.  6.100 /  2.  6.100
  
      libswresample   0. 19.100 /  0. 19.100
  
      libpostproc    52.  3.100 / 52.  3.100
  
    [wmv3 @ 0x2451bb0] Extra data: 8 bits left, value: 0
  
    [mjpeg @ 0x2450c70] ignoring invalid SAR: 0/0
  
    Guessed Channel Layout for  Input Stream #0.1 : stereo
  
    Input #0, asf, from '/var/www/vhosts/domain.com/httpdocs/video/temp/input.wmv':
  
      Metadata:
  
        WMFSDKNeeded    : 0.0.0.0000
  
        DeviceConformanceTemplate: MP@LL
  
        WMFSDKVersion   : 12.0.7601.17514
  
        IsVBR           : 0
  
      Duration: 00:00:43.99, start: 0.000000, bitrate: 1584 kb/s
  
        Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg), 320x240, 90k tbr, 90k tbn, 90k tbc
  
        Metadata:
  
          comment         : Movie/video screen capture
  
        Stream #0:1(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, 2 channels, fltp, 96 kb/s
  
        Stream #0:2(eng): Video: wmv3 (Main) (WMV3 / 0x33564D57), yuv420p, 320x240, 1500 kb/s, 30 fps, 30 tbr, 1k tbn, 1k tbc
  
    Input #1, image2, from '/var/www/vhosts/domain.com/httpdocs/images/logo_w140.png':
  
      Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
        Stream #1:0: Video: png, rgba, 140x36, 25 tbr, 25 tbn, 25 tbc
  
    [swscaler @ 0x2432d50] deprecated pixel format used, make sure you did set range correctly
  
    [libx264 @ 0x249c3b0] using cpu capabilities: none!
  
    [libx264 @ 0x249c3b0] profile High, level 3.1
  
    [libx264 @ 0x249c3b0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=abr mbtree=1 bitrate=360 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
    [wmv3 @ 0x245da80] Extra data: 8 bits left, value: 0
  
    Output #0, mp4, to '/var/www/vhosts/domain.com/httpdocs/Protected/41000/b7fe950bc0ea5a3776c3893dc035a973.mp4':
  
      Metadata:
  
        WMFSDKNeeded    : 0.0.0.0000
  
        DeviceConformanceTemplate: MP@LL
  
        WMFSDKVersion   : 12.0.7601.17514
  
        IsVBR           : 0
  
        encoder         : Lavf55.48.100
  
        Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 426x320, q=-1--1, 360 kb/s, 24 fps, 12288 tbn, 24 tbc (default)
  
        Metadata:
  
          encoder         : Lavc55.69.100 libx264
  
        Stream #0:1(eng): Audio: aac (libfaac) ([64][0][0][0] / 0x0040), 11025 Hz, mono, s16, 64 kb/s
  
        Metadata:
  
          encoder         : Lavc55.69.100 libfaac
  
    Stream mapping:
  
      Stream #0:0 (mjpeg) -> scale (graph 0)
  
      Stream #0:2 (wmv3) -> overlay:overlay (graph 0)
  
      overlay (graph 0) -> Stream #0:0 (libx264)
  
      Stream #0:1 -> #0:1 (wmav2 (native) -> aac (libfaac))
  
    Press [q] to stop, [?] for help
  
    [mjpeg @ 0x2452690] ignoring invalid SAR: 0/0
  
    [Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 161 times
  
    frame=    1 fps=0.0 q=0.0 size=       0kB time=00:00:06.73 bitrate=   0.1kbits/s[Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 237 times
  
    frame=    1 fps=1.0 q=0.0 size=      13kB time=00:00:14.44 bitrate=   7.3kbits/s[Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 238 times
  
    frame=    1 fps=0.7 q=0.0 size=      34kB time=00:00:22.43 bitrate=  12.6kbits/s[Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 244 times
  
    frame=    1 fps=0.5 q=0.0 size=      55kB time=00:00:30.23 bitrate=  14.9kbits/s[Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 241 times
  
    frame=    1 fps=0.4 q=0.0 size=      76kB time=00:00:38.12 bitrate=  16.4kbits/s[Parsed_overlay_1 @ 0x244d8c0] [framesync @ 0x244d988] Buffer queue overflow, dropping.
  
        Last message repeated 126 times
  
    frame=    2 fps=0.7 q=-1.0 Lsize=     126kB time=00:00:44.00 bitrate=  23.4kbits/s dup=0 drop=64
  
    video:3kB audio:118kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 4.045506%
  
    [libx264 @ 0x249c3b0] frame I:1     Avg QP:30.19  size:  1778
  
    [libx264 @ 0x249c3b0] frame P:1     Avg QP:34.00  size:   125
  
    [libx264 @ 0x249c3b0] mb I  I16..4: 54.1% 44.3%  1.7%
  
    [libx264 @ 0x249c3b0] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4: 10.7%  0.4%  3.5%  0.0%  0.0%    skip:85.4%
  
    [libx264 @ 0x249c3b0] final ratefactor: 25.19
  
    [libx264 @ 0x249c3b0] 8x8 transform intra:44.3% inter:100.0%
  
    [libx264 @ 0x249c3b0] coded y,uvDC,uvAC intra: 20.9% 34.3% 0.2% inter: 0.0% 0.2% 0.0%
  
    [libx264 @ 0x249c3b0] i16 v,h,dc,p: 34% 20% 14% 33%
  
    [libx264 @ 0x249c3b0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  9%  6% 15% 12% 15%  9% 13% 11% 10%
  
    [libx264 @ 0x249c3b0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  8% 44% 14%  6%  4% 10%  5%  3%  5%
  
    [libx264 @ 0x249c3b0] i8c dc,h,v,p: 48% 26% 21%  5%
  
    [libx264 @ 0x249c3b0] Weighted P-Frames: Y:0.0% UV:0.0%
  
    [libx264 @ 0x249c3b0] kb/s:182.69

• May I use OpenCV in a customized FFMPEG filter ?

  25 octobre 2017, par Codecodeup

  I am new to FFMPEG and OpenCV. I hope to overlay a heatmap video on top of a video. There could be two solutions :
  (1) Make a customized FFMPEG filter. When looping over each frame, calculate the heatmap for that frame and overlay it with the video frame. Here, I need some matrix operations to calculate the heatmap. May I use OpenCV for these operations inside the FFMPEG filter ?
  (2) Generate the heatmap, using OpenCV, as a video and then use FFMPEG to overly the heatmap video on top of the original video.

  Looks like the first one fits the FFMPEG workflow, but I am still not sure which solution is better, or if there are better solutions. Especially, I am not sure if I can use OpenCV inside FFMPEG.

  Thanks.