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• OpenCV compilation error in Fedora 21

  24 mai 2022, par eap

  I've got OpenCV source code from github and I get the following error when trying to compile it :

  



  /lib64/libavutil.so.54: undefined reference to `clReleaseMemObject@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clReleaseCommandQueue@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clCreateBuffer@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clBuildProgram@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clSetKernelArg@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clGetDeviceIDs@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clEnqueueUnmapMemObject@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clGetPlatformInfo@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clCreateProgramWithSource@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clGetDeviceInfo@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clReleaseContext@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clCreateContextFromType@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clCreateCommandQueue@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clEnqueueMapBuffer@OPENCL_1.0'
/lib64/libavutil.so.54: undefined reference to `clGetPlatformIDs@OPENCL_1.0'


  



  My machine is a laptop with Intel i7 and a GT630M graphics card and I'm using Bumblebee.

  



  Thanks.

  


• how to create video from multiple sequence of images using FFMpeg ?

  24 février 2015, par Jignesh Patel

  Hello all i am new in android developing. I want to create video from sequence of images. And i already fetch images from the specific folder which is resides in external memory card in android devices but i do not know how to use FF MPEG library to convert images into a video file. i had much tried to find out solution but yet i could not get the solution.
  Any help would be appreciated and Thanks in advance.

  I implement below code but it does not working.

  private void convertImg_to_vid()

      // TODO Auto-generated method stub
  
      Process chperm;
  
      try {
  
          chperm=Runtime.getRuntime().exec("su");
  
            DataOutputStream os = 
  
                new DataOutputStream(chperm.getOutputStream());
  
  
  
                os.writeBytes("ffmpeg -f image2 -i img%d.jpg /tmp/a.mpg\n");
  
                os.flush();
  
  
  
                chperm.waitFor();
  
  
  
      } catch (IOException e) {
  
          // TODO Auto-generated catch block
  
          e.printStackTrace();
  
      } catch (InterruptedException e) {
  
          // TODO Auto-generated catch block
  
          e.printStackTrace();
  
      }
  
  }

• Convert MP4 File to M3U8(only m3u8 file No ts file) [closed]

  28 février 2024, par Ayan Ansari

  I'm a beginner working on a content streaming app (like Netflix) where i want to add feature of quality control of the content (like switch to 480p, 720p, 1080p etc). I'm using Exoplayer for video player and the app is almost ready. But the problem i've been facing is that all the files are either mp4, mkv etc file but i need m3u8 file. So I tried converting video using FFmpeg tools which worked but it gives me LOTS OF TS file which i need to upload along with the m3u8 file. After doing some more research i was able to reduce it to 1 m3u8 and 1 TS file. Is it possible to Create only 1 m3u8 file no TS file ? Here are what i've tried.

  


  ffmpeg -i input.mp4 -c:a aac -strict -2 -c:v libx264 -preset ultrafast -crf 28 -maxrate 2M -bufsize 4M
-hls_time 6 -hls_playlist_type vod -hls_flags single_file -f hls output.m3u8


  


  I also thought i will upload all the video in different quality manually, but as a broke 17 Y/O teenager, noobie who don't know how to use AWS or cloud Servers and also AWS or Google Cloud doesn't accept Indian Debit Card(Rupay) for free trial.
Please also suggest some where i can store these data for free i guess( i don't care about where i upload, i just need the link which i can put in my database.)
Thank You :)