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• How to insert an image in between a video ?

  10 février 2019, par robinson george

  I want to make an android app in which user can insert a images in a video. I tried drawing video over the photo(selected by user) with replacing green colour in video using ffmpeg library. But the results are not very satisfying and it’s take around 4-5 seconds to encode a video of around 15 seconds. There are already many apps present in play store but i was wondering how they achieved this effect in so much lesser time(like < 1 sec to encode 15 sec video).
  For reference - https://play.google.com/store/apps/details?id=com.yy.biu
  https://play.google.com/store/apps/details?id=com.newbiz.mvmaster

  You can have a look at the result output file here- http://www.yourfilelink.com/get.php?fid=1881360

• How to make FFMPEG video grayscale ?

  15 octobre 2018, par Aang

  In my program I am using the subprocess Python module in my script to call on FFMPEG to turn a sequence of images into a video (grayscale). It works and a video is created, but upon further inspection I see that the video itself has encoded the different intensities incorrectly.

  Here is my code :

                  subprocess.call(['/usr/local/bin/ffmpeg', '-framerate', \
  
                               framerate, '-f', 'image2','-pattern_type', \
  
                               'glob', '-i', self.directory + '/orbit_*.png', \
  
                               '-r', '10', '-s', '620x380', '-flags', 'gray', self.directory + 
  
                               ".avi"])

  Here is a link to the video that’s created : https://drive.google.com/open?id=0Bxt1siua2KQma0JaMVBMcE9TOEE

  If you’ll look at the scale bar on the right in the video, which normally looks like this
  in color, you’ll see that the same color shows up twice on the scale bar. I think it’s because FFMPEG is reading colors with the same intensities (for example, yellow and blue) the same way and therefore when the photo is encoded into grayscale it looks like this.

  What can I do ? Is this a matter of changing the "-flags", "gray" parameters of my subprocess call ?

• how to get exact position in video as image view ?

  16 février 2024, par Dhruvisha Joshi

  I want to give photo editing feature in my app. so I am allowing user to add text to photo and after that I want to convert it to video using Ffmpeg command.

  &#xA;

  here is my command that adds text and convert photo to video.&#xA;ffmpeg -loop 1 -i /var/mobile/Containers/Data/Application/88F535C3-A300-456C-97BB-1A9B83EAEE7B/Documents/Compress_Picture/input.jpg -filter_complex "[0]scale=1080:trunc(ow/a/2)*2[video0];[video0]drawtext=text='Dyjfyjyrjyfjyfkyfk':fontfile=/private/var/containers/Bundle/Application/DE5C8DAA-4D66-4345-834A-89F8AC19DF9B/Clear Status.app/avenyt.ttf:fontsize=66.55112651646448:fontcolor=#FFFFFF:x=349.92:y=930.051993067591" -c:v libx264 -t 5 -pix_fmt yuv420p -y /var/mobile/Containers/Data/Application/88F535C3-A300-456C-97BB-1A9B83EAEE7B/Documents/Compress_Picture/output0.mp4

  &#xA;

  here is my swift code to generate command.

  &#xA;

  var filterComplex = ""
var inputs = ""
var audioIndex = ""

if currentPhotoTextDataArray.contains(where: { $0.isLocation }) {
 // At least one element has isLocation set to true
 // Do something here
 print("There's at least one element with isLocation == true")
                            inputs = "-i \(inputPath) -i \(self.locImagePath)"
                            audioIndex = "2"
                            
                        } else {
                            // No elements have isLocation == true
                            print("No elements have isLocation set to true")
                            inputs = "-i \(inputPath)"
                            audioIndex = "1"
                        }
                        
                        for (index, textData) in currentPhotoTextDataArray.enumerated() {
                            print("x: \(textData.xPosition), y: \(textData.yPosition)")
                            let x = (textData.xPosition) * 1080 / self.photoViewWidth
                            let y = (textData.yPosition) * 1920 / self.photoViewHeight
                            
                            let fontSizeForWidth = (textData.fontSize * 1080) / self.photoViewWidth
                            let fontSizeForHeight = (textData.fontSize * 1920) / self.photoViewHeight
                            print("fontSizeForWidth: \(fontSizeForWidth)")
                            print("fontSizeForHeight: \(fontSizeForHeight)")
                            
                            let fontPath = textData.font.fontPath
                            let fontColor = textData.fontColor.toHexOrASS(format: "hex")
                            let backColor = textData.backColor?.toHexOrASS(format: "hex")
                            print("fontPath: \(fontPath)")
                            print("fontColor: \(fontColor)")
                            
                            let breakedText = self.addBreaks(in: textData.text, with: UIFont(name: textData.font.fontName, size: fontSizeForHeight) ?? UIFont(), forWidth: 1080, padding: Int(x))
                            
                            if textData.isLocation {
                                print("Location is there.")
                                
                                let textFont = UIFont(name: textData.font.fontName, size: fontSizeForHeight)
                                let attributes: [NSAttributedString.Key: Any] = [NSAttributedString.Key.font: textFont ?? UIFont()]
                                let size = (textData.text as NSString).size(withAttributes: attributes)
                                let textWidth = Int(size.width) + 130
                                
                                var endTimeLoc = 0.0
                                if let audioData = self.audioDataArray.first(where: { $0.photoIndex == mainIndex }) {
                                    let duration = audioData.audioEndTime - audioData.audioStartTime
                                    endTimeLoc = duration
                                } else {
                                    endTimeLoc = 5
                                }
                                
                                let layerFilter = "color=color=black@.38:size=\(textWidth)x130[layer0];[video\(index)][layer0]overlay=enable='between(t,0,\(endTimeLoc))':x=\(x):y=(\(y)-(overlay_h/2))[layer1];"
                                filterComplex += layerFilter
                                let imageFilter = "[1:v]scale=80:80[image];[layer1][image]overlay=enable='between(t,0,\(endTimeLoc))':x=\(x)+10:y=(\(y)-(overlay_h/2))[v\(index)];"
                                filterComplex += imageFilter
                                
                                if index == currentPhotoTextDataArray.count - 1 {
                                    let textFilter = "[v\(index)]drawtext=text='\(breakedText)':fontfile=\(fontPath):fontsize=\(fontSizeForHeight):fontcolor=\(fontColor):x=(\(x)+100):y=(\(y)-(text_h/2))"
                                    filterComplex += textFilter
                                } else {
                                    let textFilter = "[v\(index)]drawtext=text='\(breakedText)':fontfile=\(fontPath):fontsize=\(fontSizeForHeight):fontcolor=\(fontColor):x=(\(x)+100):y=(\(y)-(text_h/2))[video\(index + 1)];"
                                    filterComplex += textFilter
                                }
                                
                            } else {
                                
                                let textBack = textData.backColor != nil ? ":box=1:boxcolor=\(backColor ?? "")@0.8:boxborderw=25" : ""
                                
                                if index == currentPhotoTextDataArray.count - 1 {
                                    let textFilter = "[video\(index)]drawtext=text='\(breakedText)':fontfile=\(fontPath):fontsize=\(fontSizeForHeight):fontcolor=\(fontColor):x=\(x):y=\(y)\(textBack)"
                                    filterComplex += textFilter
                                } else {
                                    let textFilter = "[video\(index)]drawtext=text='\(breakedText)':fontfile=\(fontPath):fontsize=\(fontSizeForHeight):fontcolor=\(fontColor):x=\(x):y=\(y)\(textBack)[video\(index + 1)];"
                                    filterComplex += textFilter
                                }
                            }
                            
                        }
                        
                        if let audioData = self.audioDataArray.first(where: { $0.photoIndex == mainIndex }) {
                            
                            let audioSTime = self.getSTimeAudio(index: mainIndex, secondsPhoto: Int(audioData.audioStartTime))
                            let audioETime = self.getETimeAudio(index: mainIndex, secondsPhoto: Int(audioData.audioEndTime))
                            let duration = audioData.audioEndTime - audioData.audioStartTime
                            
                            command = "-loop 1 \(inputs) -ss \(audioSTime) -to \(audioETime) -i \"\(audioData.audioURL.path)\" -filter_complex \"[0]scale=1080:trunc(ow/a/2)*2[video0];\(filterComplex)[final_video]\" -map \"[final_video]\":v -map \(audioIndex):a -c:v libx264 -t \(duration) -pix_fmt yuv420p -y \(outputURL.path)"
                            
                        } else {
                            command = "-loop 1 \(inputs) -filter_complex \"[0]scale=1080:trunc(ow/a/2)*2[video0];\(filterComplex)\" -c:v libx264 -t 5 -pix_fmt yuv420p -y \(outputURL.path)"
                        }
                    }


  &#xA;

  I am not getting exact position of text in generated video as added by user. if anyone knows please help me with this.

  &#xA;