Recherche avancée

Sur d’autres sites (7128)

• How to make a Magick.NET watermark ? [closed]

  26 janvier 2021, par sibbasa

  Has anyone worked with Magick.NET ? Do I need to transfer this code to C# Magick.NET ? I can't find examples and documentation of Magick.NET. :( Can someone help me ?

  


      logo=../../logo/Moto_Gymkhana_transparent.png
    Frames=15
    width=842
    height=595
    mkdir tmp
    for (( n=0; n<=90; n+=$(expr $(( 90/$Frames )))))
    do
    oWidth=$(printf %.$2f $(echo "$width*(c($n*4*a(1)/180))+1" | bc -l))
    shadowShift=$(printf %.$2f $(echo "15*(s($n*4*a(1)/180))+1" | bc -l))
    convert -size 850x600 xc:transparent -background none \( -alpha set -channel A -evaluate add -50% $logo -geometry $oWidth\ x$height\! \) -gravity center -composite -depth 8 ./tmp/$n.png
    convert tmp/$n.png \( +clone -background '#cccf' -shadow 100x8+$shadowShift-3 \) -background none  -compose Dst_Over -layers merge -gravity center -depth 8 tmp/logo$(expr $(( 1000+n ))).png
    convert tmp/$n.png \( +clone -background '#cccf' -shadow 100x8-$shadowShift-3 \) -background none -compose Src_Over -layers merge -gravity center -flop tmp/logo$(expr $(( 1800-n ))).png
    convert tmp/$n.png \( +clone -background '#cccf' -shadow 100x8+$shadowShift-3 \) -background none  -compose Src_Over -layers merge -gravity center -flop tmp/logo$(expr $(( 2000+n ))).png
    convert tmp/$n.png \( +clone -background '#cccf' -shadow 100x8-$shadowShift-3 \) -background none -compose Dst_Over -layers merge -gravity center tmp/logo$(expr $(( 2800-n ))).png
    done
    ffmpeg -pattern_type glob -i 'tmp/logo*.png' -pix_fmt argb -vcodec qtrle -r 30 rotatingLogo.mov
    ffmpeg -loop 1 -pattern_type glob -i 'tmp/logo1000.png' -pix_fmt argb -vcodec qtrle -r 30 -t 3 stillLogo.mov
    rm list.txt
    for (( i=0; i<20; i+=1 ))
    do
    echo file 'stillLogo.mov' >> list.txt
    echo file 'rotatingLogo.mov' >> list.txt
    done
    ffmpeg -f concat -i list.txt -c copy logoWithRotation.mov


  


• Piping images to FFMPEG using stdin causes artifacts

  15 avril 2021, par Michael Joseph Aubry

  I am sending images from puppeteer as a base64 buffer to stdin childProcess.stdin.write(frame); The images are piped one frame at a time inside a loop.

  


  This works well except I am getting weird artifacts and frames flickering — here is an example https://s3.us-west-2.amazonaws.com/storycreator.v2.rendered/cknhtqu2e0016niuuqmtu5u7b?t=0

  


  I've found when hardcoding a delay between each frames being piped that the artifacts/flickering is reduced.

  


  await new Promise((resolve) => {
  setTimeout(() => {
    resolve("done");
  }, 3000);
});

// then after 3s pipe the buffer
childProcess.stdin.write(frame);


  


  Another solution I found to solve the issue is to encode it as a .h264 then convert it to a .mp4. The problem is the video timing is drastically off.

  


  // The ffmpeg command
const childProcess = spawn(ffmpeg, [
  "-y",
  "-f",
  "image2pipe",
  "-pix_fmt",
  "argb",
  "-s",
  "1920x1080",
  "-r",
  `${fps ? `${fps}` : 100}`,
  "-i",
  "async:cache:pipe:0",
  "-an",
  "-vcodec",
  "libx264",
  "-pix_fmt",
  "yuv420p",
  "-r",
  `${fps ? `${fps}` : 100}`,
  "-y",
  `/tmp/${renderId}.mp4` // using .h264 seems to solve flicker but causes a weird framerate
]);


  


• ffmpeg library - why is the Bitrate parameter change on encoding

  22 avril 2021, par QRrabbit

  Hello forum and all the members of the community !

  


  I have this question on ffmpeg library, why does the bitrate parameter not retained after encoding, even though I explicitly specify the desired rate.

  


  Input file ffprobe :

  


    Duration: 00:00:10.01, start: 0.000000, bitrate: 534719 kb/s
    Stream #0:0(eng): Video: qtrle (rle  / 0x20656C72), argb(progressive), 1920x1080, 533881 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
    Metadata:
      creation_time   : 2021-04-13T16:35:16.000000Z
      handler_name    : Apple Video Media Handler
      encoder         : Animation
      timecode        : 00:00:00;00


  


  Here's the command I run :

  


  ffmpeg -i input.mov -map 0:a? -map 0:s? -pix_fmt argb -b:v 533881667 -maxrate 533881667 -minrate 533881667 -r 29.97 -top 1 -color_range 1 -colorspace 1 -color_primaries 1 -color_trc bt709 -map_metadata 0 -c:a copy -timecode 00:00:00.00 -c:v qtrle -c:s copy output.mov


  


  Output file ffprobe :

  


    Metadata:
    major_brand     : qt  
    minor_version   : 512
    compatible_brands: qt  
    creation_time   : 2021-04-13T16:35:16.000000Z
  Duration: 00:00:10.01, start: 0.000000, bitrate: 100126 kb/s
    Stream #0:0: Video: qtrle (rle  / 0x20656C72), argb(progressive), 1920x1080, 100133 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 11988 tbn, 11988 tbc (default)
    Metadata:
      creation_time   : 2021-04-13T16:35:16.000000Z
      handler_name    : VideoHandler
      encoder         : Lavf58.58.100
      timecode        : 00:00:00;00


  


  As it is visible from the ffprobe from above, I go from :

  


  The Input's file bitrate : 534719 kb/s
to Output bitrate : 100126 kb/s