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• FFMPEG picture in picture

  19 février 2016, par Jalyo

  I try to put a portion of video in a video at a certain time.

  Se here’s my command :

  ./ffmpeg-3.0-32bit-static/ffmpeg \
  
  -y \
  
  -i main.mp4 \
  
  -itsoffset -10 \
  
  -i overlay.mp4 \
  
  -filter_complex \
  
  "[1:a] atrim=5:20 [1:a1]; \
  
  [1:a1] adelay=5000|5000 [1:a2]; \
  
  [0:a][1:a2] amix [outa]; \
  
  [1:v] scale=120:-1 [1:v1]; \
  
  [0:v][1:v1] overlay=x=25:y=25:enable='between(t,5,20)'[outv]" \
  
  -map "[outv]" \
  
  -map "[outa]" \
  
  -c:a aac \
  
  -c:v libx264 \
  
  -vb 1000k \
  
  -r 24 \
  
  -strict -2 \
  
  output.mp4

  But I’ve got "Buffer queue overflow, dropping" messages which, I think, makes my overlay.mp4 a little jerky on the output.mp4 :

  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.
  
      Last message repeated 50 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.0.927x
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.72x
  
      Last message repeated 33 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.72x
  
      Last message repeated 14 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.97x
  
      Last message repeated 13 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.16x
  
      Last message repeated 35 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.35x
  
      Last message repeated 45 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.46x
  
      Last message repeated 5 times

  Any idea why ?

  EDIT : Forgot to say I’ve got the last version of ffmpeg => 3.0.

• How to capture a web stream's picture in swift without playing it

  13 avril 2016, par Sergio

  I am developing an application for ios, using swift in wich I need to capture one frame from the stream at every minute, to show in a picture view.

  I am thinking to use ffmpeg.
  I tried the ffmpeg command in my mac terminal, and it works :

  ffmpeg -probesize 4096 -analyzeduration 50000 -threads 1 -i -vf fps=fps=1 -frames 1 -threads 1 -y -s 320×240 -f mjpeg -pix_fmt yuvj444p .jpg

  But I don’t know how to call my compiled ffmpeg for ios, inside my app (I already has compiled it, with the ’.a’ libs)

  I also read about using something like (not ffmpeg) :

  func thumbnail(sourceURL sourceURL:NSURL) -> UIImage?
  
  {
  
      let asset = AVAsset(URL: sourceURL)
  
      let imageGenerator = AVAssetImageGenerator(asset: asset)
  
      imageGenerator.appliesPreferredTrackTransform = true
  
  
  
      var time = asset.duration
  
      time.value = min(time.value, 2)
  
  
  
      do {
  
          let imageRef = try imageGenerator.copyCGImageAtTime(time, actualTime: nil)
  
          return UIImage(CGImage: imageRef)
  
      }
  
      catch let error as NSError
  
      {
  
          print("Image generation failed with error \(error)")
  
          return nil;
  
      }
  
  }

  but it doesn’t work.
  it returns this error :

  Image generation failed with error Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo=NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x15734af0 Error Domain=NSOSStatusErrorDomain Code=-12782 "(null)", NSLocalizedFailureReason=An unknown error occurred (-12782)
  fatal error : unexpectedly found nil while unwrapping an Optional value

  Any ideas ?

  Thanks

• avfilter/delogo : Check that logo area is inside the picture

  10 mai 2016, par Jean Delvare

  avfilter/delogo : Check that logo area is inside the picture
  We can only remove the logo if it is inside the picture. We need at
  
  least one pixel around the logo area for interpolation.
  Fixes ticket #5527 (Delogo crash with x=0 and/or y=0).
  Signed-off-by : Jean Delvare <jdelvare@suse.com>
  
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavfilter/vf_delogo.c