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• lavu/pixfmt : Add P012, Y212, XV30, and XV36 formats

  13 août 2022, par Philip Langdale

  lavu/pixfmt : Add P012, Y212, XV30, and XV36 formats
  These are the formats we want/need to use when dealing with the Intel
  
  VAAPI decoder for 12bit 4:2:0, 12bit 4:2:2, 10bit 4:4:4 and 12bit 4:4:4
  
  respectively.
  As with the already supported Y210 and YUVX (XVUY) formats, they are
  
  based on formats Microsoft picked as their preferred 4:2:2 and 4:4:4
  
  video formats, and Intel ran with it.
  P12 and Y212 are simply an extension of 10 bit formats to say 12 bits
  
  will be used, with 4 unused bits instead of 6.
  XV30, and XV36, as exotic as they sound, are variants of Y410 and Y412
  
  where the alpha channel is left formally undefined. We prefer these
  
  over the alpha versions because the hardware cannot actually do
  
  anything with the alpha channel and respecting it is just overhead.
  Y412/XV46 is a normal looking packed 4 channel format where each
  
  channel is 16bits wide but only the 12msb are used (like P012).
  Y410/XV30 packs three 10bit channels in 32bits with 2bits of alpha,
  
  like A/X2RGB10 style formats. This annoying layout forced me to define
  
  the BE version as a bitstream format. It seems like our pixdesc
  
  infrastructure can handle the LE version being byte-defined, but not
  
  when it's reversed. If there's a better way to handle this, please
  
  let me know. Our existing X2 formats all have the 2 bits at the MSB
  
  end, but this format places them at the LSB end and that seems to be
  
  the root of the problem.
  

  • [DH] doc/APIchanges
  • [DH] libavutil/pixdesc.c
  • [DH] libavutil/pixfmt.h
  • [DH] libavutil/version.h
  • [DH] tests/ref/fate/imgutils
  • [DH] tests/ref/fate/sws-pixdesc-query

• FFmpeg audio crossfade

  27 mai 2015, par chamath

  I’m trying to merge several videos using ffmpeg and apply the cross-fade transition in between. I got video cross-fade working by referring to this. At the same time I need to have audio also to have cross-fade applied for original audios associated with each video. I referred several places but they resulted,

  Buffer queue overflow, dropping.

  This, this and this are few i referred. I got the solution of this and this producing the output with concat option where the length of the audio is greater than the video. Though I used the exact fade values used in video it seams not working like in video.
  Following is the ffmpeg command I’m testing.

  ffmpeg -i 1.mp4 -i 2.mp4 -i 3.mp4 -i 4.mp4 -i 5.mp4 -f lavfi -i color=black -filter_complex "
  
  [0:v]scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2,format=pix_fmts=yuva420p,fade=t=out:st=15:d=2:alpha=1,setpts=expr=PTS-STARTPTS[va0];
  
  [1:v]scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2,format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,fade=t=out:st=30:d=2:alpha=1,setpts=expr=PTS-STARTPTS[va1];
  
  [2:v]scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2,format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,fade=t=out:st=43:d=2:alpha=1,setpts=expr=PTS-STARTPTS[va2];
  
  [3:v]scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2,format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,fade=t=out:st=54:d=2:alpha=1,setpts=expr=PTS-STARTPTS[va3];
  
  [4:v]scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2,format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,setpts=expr=PTS-STARTPTS[va4];
  
  [5:v]scale=1280x720,trim=duration=69[over0];
  
  [0:a]afade=t=out:st=15:d=2,asetpts=PTS-STARTPTS[a0];
  
  [1:a]afade=t=in:st=0:d=2,afade=t=out:st=30:d=2,asetpts=PTS-STARTPTS[a1];
  
  [2:a]afade=t=in:st=0:d=2,afade=t=out:st=43:d=2,asetpts=PTS-STARTPTS[a2];
  
  [3:a]afade=t=in:st=0:d=2,afade=t=out:st=54:d=2,asetpts=PTS-STARTPTS[a3];
  
  [4:a]afade=t=in:st=0:d=2,asetpts=PTS-STARTPTS[a4];
  
  [a0][a1][a2][a3][a4]concat=n=5:v=0:a=1[outa];
  
  [over0][va0]overlay[over1];
  
  [over1][va1]overlay[over2];
  
  [over2][va2]overlay[over3];
  
  [over3][va3]overlay[over4];
  
  [over4][va4]overlay=format=yuv420[outv]" 
  
  -vcodec libx264 -preset fast -r 60 -b:v 45000k -aspect 1.78 -map [outv] -map [outa] -c:a libfdk_aac -ac 2 -b:a 128k -shortest test.mp4

  Also when i use the same asetpts as video it result the same issue mentioned above.
  What am I doing wrong here and is there any other method that I can use to have both video and audio cross-faded ?

• Understand your visitors by seeing where they click, hover, type and scroll, and replay their actions in a video

  18 mai 2017, par InnoCraft — Plugins

  Hi, this is Mike from InnoCraft, the company of the makers of Piwik Analytics which is used by over 1 million websites and apps in over 150 countries.

  I’m very proud to introduce you to our Heatmap & Session Recording feature which lets you analyze your visitors’ behaviour on a whole new level that was not possible before.

  With Heatmaps you can see where people think something is clickable but it is not, how far down the page do they scroll, whether they see your important buttons and Call To Actions, or even whether you can re-position your page layout to put the important content in more visible places. Both the mouse movements and all clicks are recorded and viewable on these new beautiful heatmap visualisations.

  With Session Recordings, you get to see a video showing exactly what a visitor did on your pages, including all mouse movements, scrolls, text typed in the keyboard, and more. Using these recordings you can improve the usability on your website, replace costly (and less effective) eye tracking sessions, and you can now see exactly what problems your visitors experience or how they behave on your website. This gives new insights and ability to understand what your users think.

  -> Read the rest of the story on the Heatmaps & Session Recordings Marketplace page.

  What does the new Heatmaps reports look like ?

  Here is below just a little preview of the new Heatmaps reports.

  1) Mouse move and Click Heatmaps

  

  2) A Scroll Heatmap

  

  What does the new Session Recording look like ?

  You can replay videos of exactly what your users did on your websites including mouse moves, scrolls, typing in forms, and more.

  1) Listing all recorded video sessions

  

  2) Playing a recorded video session

  

  Where do I get Heatmaps & Session Recording for Piwik ?

  The new premium plugin is available on the Piwik Marketplace :

  Get Heatmaps & Session Recording on the Marketplace

  This is a premium plugin for Piwik and comes with our 14 day money back guarantee and 1-click installation & updates (all product updates come for free).

  You can also signup for a free Piwik Cloud-hosted trial to discover the power of Heatmaps & Session Recordings !