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• Why does ffmpeg generate a mpeg-dash mpd with long timeShiftBufferDepth even with window_size of one minute ? [closed]

  1er février 2024, par igorblima

  I'm having a problem with ffmpeg when i try to create a dynamic mpd from rtmp livestream. The vídeo integrity its ok and works fine, but the only problem is with the timeShiftBufferDepth. The command specifies how much window_size to have, but for some reason the timeShiftBufferDepth generated by ffmpeg doesn't respect that. I specified 1 minute of window_size, but for some reason unknown to me, the timeShiftBufferDepth is generated as 8 minutes

  


  the command :

  


  ffmpeg -i rtmp://localhost:1935/live/stream -c:v libx264 -b:v 1000k -c:a aac -b:a 128k -strict experimental -f dash -window_size 60 -utc_timing_url https://time.akamai.com/?ms -seg_duration 5 -remove_at_exit 1 -dash_segment_type mp4 h264.mpd


  


  result :

  


  timeShiftBufferDepth="PT8M19.9S"


  


  how i say previously, the mpd works fine in the player. The only issue is with that incorrect timeShiftBufferDepth

  


  i read the ffmpeg documentation https://ffmpeg.org/ffmpeg-formats.html#Options-19

  


• FFMPEG Python command too long

  22 janvier 2024, par billy 356

  I am trying to make a program that will overlay some images with a "slide" animation.
So I am doing this with FFMPEG in my Python code, and there are lots of files and commmands since the slide animation is frame per frame.

  


  for i in range(1, fps): h = yscale - ratio * (fps-i) # print(h) bg = bg.overlay(img_split[i].filter('crop', w1*scale, h, 0, 0), enable=f"between=(t, {nt},{nt + tsp})", x=x, y=y) nt += tsp

  


  this is where I am overlaying the images, and this is where i export the "bg"

  


  ffmpeg.output(bg, path, vcodec='h264_nvenc', **{'b:v': '30M'}).run(overwrite_output=True)  

  


  But since there are lots of small changes, the FFMPEG command is very long, so I get the following error :
FileNotFoundError: [WinError 206] The filename or extension is too long

  


  I tried to get the command and execute it separetly.
With FFMPEG you can get the command by doing ffmpeg.output(...).get_args(), which gives a list of arguments
I tried putting these in a file and run the file with batch but I had this error
C:\Users\billy\Desktop\tests\MIXER>bash cmd.txt cmd.txt: line 1: syntax error near unexpected token t,'
cmd.txt : line 1 : ffmpeg -i project/_pk.mp4 -i project/images/1.png -i project/images/2.png -i project/images/3.png -i project/images/4.png -i project/images/5.png -i project/images/6.png -i project/images/7.png -i project/images/8.png -i project/images/9.png -i project/images/10.png -i project/images/11.png -i project/images/12.png -i project/images/13.png -i project/images/14.png -i project/images/15.png -i project/images/16.p (I didn't copy the whole thing as it's very long)

  


• 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.