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• how to prevent long text going out of video bounds ?

  30 décembre 2023, par Dhruvisha Joshi

  i am adding text to video using ffmpeg.

  


  var filterComplex = ""
for (index, textData) in textDataArray.enumerated() {
     print("x: \(textData.xPosition), y: \(textData.yPosition)")
     let x = (textData.xPosition * 1080) / videoViewWidth
     let y = (textData.yPosition * 1920) / videoViewHeight
                                    
     let fontSizeForWidth = (20 * 1080) / videoViewWidth
     let fontSizeForHeight = (20 * 1920) / videoViewHeight
     print("fontSizeForWidth: \(fontSizeForWidth)")
     print("fontSizeForHeight: \(fontSizeForHeight)")
                                    
     if index == textDataArray.count - 1 {
         let textFilter = "[video\(index)]drawtext=text='\(textData.text)':fontfile=\(fontPath):fontsize=\(fontSizeForHeight):fontcolor=white:x=(main_w-text_w-\(x)):y=(\(y)-(text_h/2))"
          filterComplex += textFilter
     } else {
          let textFilter = "[video\(index)]drawtext=text='\(textData.text)':fontfile=\(fontPath):fontsize=\(fontSizeForHeight):fontcolor=white:x=(main_w-text_w-\(x)):y=(\(y)-(text_h/2))[video\(index + 1)];"
          filterComplex += textFilter
     }
                                    
}


  


  this is my code to add drawtext to command. now my problem is if text is longer it is going out of video bounds instead i want it to be at same x y positons but i want to convert it to multiple lines.

  


  i have seen some solutions where they are telling me to add \n to my text but i am getting it from user and i am not able to determine that where to add \n so this solution is not working for me. if possible tell me how to change x y so that i can manage this or any other solutions if more effective.

  


• FFmpeg4 android Applying Overlay (watermark) taking too long

  13 janvier 2019, par Web Developer

  I’m using ffmpeg4 on android (Java) to apply overlay/watermark on the bottom left corner of the recorded video that is saved in the SD CARD.

  The video recording has maximum duration of 59 seconds. The problem that I’m facing is that I’m applying water through this command of ffmpeg4

  String[] complexCommand1 = new String[]"ffmpeg", "-y", "-i",
  "input.mp4", "-strict", "experimental", "-c:v", "libx264", "-preset",
  "ultrafast", "-vf", "movie=/water.png [watermark] ; [in][watermark] overlay=main_w-overlay_w-", "10:10", " [out]", "-s", "320x480", "-aspect",
  "2:3", "-r", "30", "-b:v", "500k",
  "output.mp4"  ;

  I’ve reduced the video resolution to 320x480 after the conversion and 480p to recorded video that is provided as input to this command but still the processing time is around 40 seconds.

  Can someone provide me workaround this to reduce this processing time.

  or what should I do to reduce this processing time. I’ve researched a lot on this and found some GitHub issues link and tried their solutions but none of them seemed to work for me.

• cv2.VideoCapture() taking extremely long time to connect and returning empty frames

  18 novembre 2022, par John Schmidt

  When executing the code

  


  cap = cv2.VideoCapture('udp://127.0.0.1:1080',cv2.CAP_FFMPEG)


  


  The script will yield for at least a minute, and then connect. Along with that, it seems that, almost at random, the script will completely break and cv2.VideoCapture() will return nothing. the stream is initiated with the command

  


  ffmpeg.exe -y -f dshow -thread_queue_size 4096 -hwaccel cuda -hwaccel_output_format cuda -i video="OBS Virtual Camera" -f rawvideo -c:v mjpeg -qscale:v 0 -r 20 udp://127.0.0.1:1080


  


  if that helps any.

  


  I tried many different methods of starting the stream, color formats, and more. Still, they all had this issue.

  


  (note this does work sometimes, but seemingly at random will completely stop working for many days to come, and then suddenly begin working)