Newest 'ffmpeg' Questions - Stack Overflow

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• FFmpeg C++ Library building issue [on hold]

  13 septembre 2019, par Ahtazaz khan

  I'm trying to integrate FFmpeg library in my Xcode project, And following this Stackoverflow Question. As I follow each and every step from that Question, But at the end got this compiler error.

  Here is a screenshot of Libraries Error. Any Help will be highly appreciated. Thanks

• Crop video scale square to round shape -Android

  13 septembre 2019, par Adil

  Currently I'm developing video editing app, in which i want to overlay video to image i used FFMPEG library and use overlay command and export video to video.mp4 format

  Here is done with overlay command :

  private void extractImagesVideo() {
      File moviesDir = Environment.getExternalStoragePublicDirectory(
      Environment.DIRECTORY_PICTURES
  );
  
  String filePrefix = "extract_picture";
  String fileExtn = ".mp4";
  
  File dir = new File(moviesDir, "VideoEditor");
  int fileNo = 0;
  while (dir.exists()) {
  fileNo++;
  dir = new File(moviesDir, "VideoEditor" + fileNo);
  
  }
  dir.mkdir();
  File dest = new File(dir, filePrefix + "%03d" + fileExtn);
  
  Log.d(TAG, "startTrim: dest: " + dest.getAbsolutePath());
  
  // String complexCommand[]={"-y","-i",mStrImagePath,"-i",mStrVideoPath,"-filter_complex","[0]scale=720:1280:force_original_aspect_ratio=decrease,drawbox=x=10:y=10:w=100:h=100:color=pink@0.5:t=max: (ow-iw)/2:(oh-ih)/2,setsar=1[backd],[backd][1] overlay=x=(main_w-overlay_w)/(main_w-overlay_w):y=(main_h-overlay_h)","-acodec","copy",dest.getAbsolutePath()};
  
  String complexCommand[]={"-y","-i",mStrVideoPath,"-f","lavfi","-i","color=c=black:s=1920x1080","-filter_complex","[0:v]scale=w=0.80*iw:h=0.80*ih[scaled],[1:v][scaled]overlay=x=0.10*main_w:y=0.10*main_h:eof_action=endall[out]","-acodec","copy",dest.getAbsolutePath()};
  
  
  // String complexCommand[]={"-y","-i",mStrImagePath,"-i",mStrVideoPath,"-filter_complex","[1:v] scale=200:200 [ovr1], [1:v] scale=200:200 [ovrl2], [0:v][ovr1] overlay=25:25:enable='between(t,0,20)' [temp1], [temp1][ovrl2] overlay=50:50:enable='between(t,20,40)'","-acodec","copy",dest.getAbsolutePath()};
  // String complexCommand[]={"-y","-i",mStrImagePath,"-i",mStrVideoPath,"-filter_complex","[0]scale=1024:1280:force_original_aspect_ratio=decrease,pad=1024:1280:(ow-iw)/2:(oh-ih)/2,setsar=1[backd],[backd][1] overlay=x=(main_w-overlay_w)/(main_w-overlay_w):y=(main_h-overlay_h):shortest=1","-acodec","copy",dest.getAbsolutePath()};
  
  /* Remove -r 1 if you want to extract all video frames as images from the specified time duration.*/
  execFFmpegBinary(complexCommand);
  }
  

  Issue is video showing square shape i want to crop video into rounded shape, i check almost solutions and check also FFMPEG commands , i found mask overlay on video but isn't a proper solution

• How to add compression to ffmpeg command

  13 septembre 2019, par balfred

  I am trying to add a good level of compression to the following ffmpeg command or if it is already good can you help me understand?

  I have seen that people might have luck using this command but I dont know how to merge it into mine

  ffmpeg -i sourceFilePath -vcodec h264 -acodec mp3 newFilePath
  

  This is my current command that I am using that I need help understanding why the previous command might be a better solution but how to implement my additional arguments

  ffmpeg -i sourceFilePath -vcodec libx264 -profile:v baseline -level 3 newFilePath
  

  I want to see optimal compression and still have my existing functionality using my additional arguments. I dont know what will produce the best results, this is out of my area of expertise.

• Can you stream video with ffmpeg and opencv without long buffers

  13 septembre 2019, par steve

  I'm successfully getting a video stream using ffmpeg, and displaying with opencv, but the video starts and stops very often and is not as smooth as when played on a browser. Is there a way to get the video stream to be as smooth as on a browser?

  I've tried playing with ffmpeg parameters as well as having multiple pipes to stitch together a single video.

  import cv2
  import numpy as np
  import subprocess as sp
  import time
  
  
  # Playlist manifest for video from Nevada DOT traffic camera
  VIDEO_URL = "https://wowza1.nvfast.org/bmw3/charleston_and_fremont_public.stream/playlist.m3u8"
  
  width = 360
  height = 240
  
  pipe = sp.Popen([ 'ffmpeg', "-i", VIDEO_URL,
              "-loglevel", "quiet", # no text output
              "-an",   # disable audio
              "-f", "image2pipe",
              "-pix_fmt", "bgr24",
              "-r", "15", # FPS
              "-hls_list_size", "3", 
              #"-hls_time", "8" 
              "-vcodec", "rawvideo", "-"],
              stdin = sp.PIPE, stdout = sp.PIPE)
  
  while True:
  
          # Convert bytes to image
          raw_image = pipe.stdout.read(width*height*3) # read 432*240*3 bytes (= 1 frame)
          img =  np.fromstring(raw_image, dtype='uint8').reshape((height,width,3))
          raw_image = np.copy(img)
  
          # Show image
          cv2.imshow('pipe', img)
          cv2.waitKey(1)
          time.sleep(0.05) # This is to slow down the video so it plays more naturally
  
  

  The expected output is a opencv window that displays the video just like in https://cctv.nvfast.org/

  I assume the problem lies in ffmpeg not getting the video chunks.

• Cannot Compile C Program That Uses a Library (FFmpeg) with GCC Because of the Library's Include Statements

  12 septembre 2019, par NetherGranite

  I am unable to compile a C project that uses a library called "FFmpeg" with a compiler called "GCC", and I believe it might be either because I don't quite understand how #include works or because I am using the wrong compilation process.

  In a folder called Test, I have a file Test/test.c with the following contents:

  #include 
  #include 
  #include "FFmpeg/libavcodec/avcodec.h"
  

  The folder FFmpeg is located at Test/FFmpeg. When I try to compile this with GCC, I receive the following error:

  fatal error: libavutil/samplefmt.h: No such file or directory
  

  The file Test/FFmpeg/libavcodec/avcodec.h has the following code in it:

  #include "libavutil/samplefmt.h"
  #include "libavutil/attributes.h"
  #include "libavutil/avutil.h"
  ... //many more #include statements
  

  Is the issue here that I need to add "FFmpeg/" to all of these include statements?

  If so, is there a way to automatically do this? This library is enormous and probably has hundreds of these statements.

  If not, what should I be doing instead? Should I attempt to compile the library by itself? If so, how do I then include this compiled version of the library in my program?

  ---

  Notes:

  • The command I am using to compile is gcc -c test.c.
  • I have GCC installed via MinGW.
  • I ultimately need to be able to compile this program to both a .dll and an .so.

  ---

  I apologize if any of the terminology I use here is incorrect or if my explanations are poor. I know almost nothing about compilation. Please let me know if I need to fill in more information.