Sur d’autres sites (10930)

• running ECSTask in IOS

  26 janvier 2017, par DecKno

  I am new to IOS platform. I have a code snippet written using JAVA API.

       AmazonECS amazonECS = new AmazonECSClient(credentials).withRegion(usWest1);           
  
       String command="bash /opt/run-task.sh "+"/mnt/s3/inputFile1::/mnt/s3/inputFile2"+" "+ "outputFile";
  
  
  
         ContainerOverride containerOverrides = new ContainerOverride().withCommand(command).withName("&lt;<container>>");
  
         TaskOverride overrides = new TaskOverride().withContainerOverrides(containerOverrides);
  
         RunTaskRequest runTaskRequest = new RunTaskRequest().withCluster("&lt;<cluster>>").withTaskDefinition("&lt;<task definition="definition" arn="arn">>")
  
                 .withOverrides(overrides).withGeneralProgressListener(new ProgressListener() {
  
  
  
                  @Override
  
                  public void progressChanged(ProgressEvent progressEvent) {
  
                      System.out.println(progressEvent.getBytesTransferred());
  
                      System.out.println(progressEvent.getEventType());
  
                  }
  
              });
  
  
  
  
  
         Task task = new Task().withTaskDefinitionArn("&lt;<task definition="definition" arn="arn">>")
  
                          .withOverrides(overrides);
  
  
  
          RunTaskResult runTaskResult = amazonECS.runTask(runTaskRequest).withTasks(task);
  
          List<failure> failures = runTaskResult.withTasks(task).getFailures();
  
  </failure></task></task></cluster></container>

  I am using ffmpeg to merge few video files as single file. I need to know if there is equivalent functionality available in IOS.

• ffmpeg - overlay filter alpha premultiplied performs brighter on transparent images

  26 avril 2022, par windows_air

  Description

  


  I'm using ffmpeg's overlay filter with alpha premultiplied parameter. I noticed that when a completely transparent image was overlay to the background video, the output video was much brighter.

  


  In the following demo, I will use RGBA8888 format images for overlay. Its use of RGBA (255,255,255,0) indicates full transparency (aka completely transparent white), and the result demonstrates a very noticeable brightening (the expected result should be unchanged, since the image is completely transparent).
ps : Using RGBA (0,0,0,0) (aka completely transparent black) also results in a brightened image.

  


  Code (overlay transparent white)

  


  ffmpeg.exe  -loglevel debug -i a1.mp4 -i a1.png -filter_complex "[0:v][1:v]overlay=x=0:y=0:alpha=premultiplied[v]" -map "[v]"  -c:v:0 libx264 -f mp4  output.mp4


  


  result_img_white

  


  Code (overlay transparent black)

  


  This command uses lavfi to simulate the transparent black output of RGBA. For demonstration purposes only, you may need ctrl+c to prevent infinite output.

  


  ffmpeg.exe -y -i a1.mp4 -f lavfi -i "color=color=black@0.0:size=1920x540,format=rgba" -filter_complex "[0:v][1:v]overlay=x=0:y=0:alpha=premultiplied[v]" -map "[v]"  -c:v:0 libx264 -f mp4  output.mp4


  


  result_black_img

  


  The results show that the upper part is more whitish (brighter).

  


  Related files can be downloaded here : https://gist.github.com/windowsair/5315437a97dadf3f74f886486657183d

  


  ---

  


  Back to the question, I had to use premultiplied to get the correct overlay result : Using the straight option will have a darkening effect in areas that are not fully transparent, which is why I insisted on premultiplied . Is this a ffmpeg problem ? How should I avoid the undesirable effect of brighter images from transparent image overlays ? Thank you !

  


• ffmpg - Overlay merged video from a bunch of small videos on another video

  31 août 2022, par Krishna Chebrolu

  I have a situation where 3-4 small 5secs video clips to be merged and placed at a specific point in time of another video within a fixed frame of 800x600.

  


  For example, main video is of 40 secs of 1280x720 resolution and have 4 small clips of 5 secs each to be placed in a frame of 800x600 from 10 to 30 secs one after the other (or) merge them before placing within the frame.

  


  I tried multiple filters and failing to get the required output.

  


  ffmpeg -y -i bg.mp4 -i c0.mp4 -i f.mp4 -filter_complex "split [main][tmp]; [tmp][1:v][1:a][2:v][2:a]concat=n=2:v=1:a=1[tmp1]; [main][tmp1] overlay=enable='between(t,10,24)':x=50:y=50[v]; [v]drawtext=enable='between(t,26,29)':font='DejaVu Serif':text='Kris Cheb':x=(w-tw)/2:y=((h-text_h)/4): fontsize=80: fontcolor=white, drawtext=enable='between(t,27,29)':text='Awesome Work..':x=(w-tw)/2:y=(((h-text_h)/3)+20): fontsize=38: fontcolor=white, drawtext=enable='between(t,27,29)':text='Congratulations!!':x=(w-tw)/2:y=(((h-text_h)/2)+10): fontsize=38: fontcolor=white"[v] -map [v] out.mp4


  


  Of course, in the above command, I'm yet to add scale with force_original_aspect_ratio=decrease filter and associated attributes.

  


  Could someone please suggest how to achieve this with ffmpeg ?

  


  Thanks

  


  [EDIT-1] :

  


  To overcome this issue, as an alterative, I had split bg.mp4 into multiple segments intro.mp4, outro.mp4 & frame.png and concatenated them with the following command, which is working fine. Of course, there is slight deviation from original requirement of placing c0.mp4 & f.mp4 as overlay in the middle segment and now frame.png is being used as overlay on these middle segment clips.

  


  ffmpeg -y -i intro.mp4 -i c0.mp4 -i f.mp4 -i outro.mp4 -i frame.png &#xA;-filter_complex "[0:v][0:a][1:v][1:a][2:v][2:a][3:v][3:a]concat=n=4:v=1:a=1[vv][a];&#xA;[vv][4:v]overlay=enable=&#x27;between(t,4,16)&#x27;:x=0:y=0[v];&#xA;[v]drawtext=text=&#x27;NAME&#x27;: font=&#x27;Serif&#x27;:fontsize=70: fontcolor=white: x=((w-tw)/2):y=(((h-text_h)/4)&#x2B;10):enable=&#x27;between(t,16,20)&#x27;, &#xA;drawtext=text=&#x27;TEXT2&#x27;:font=&#x27;Serif&#x27;:fontsize=40: fontcolor=black:x=((w-tw)/2): y= ((h/2)&#x2B;30):enable=&#x27;between(t,16,20)&#x27;,&#xA;drawtext=text=&#x27;<text3>&#x27;:font=&#x27;Serif&#x27;:fontsize=40: fontcolor=black:x=((w- &#xA;tw)/2):y=((h/2)&#x2B;70):enable=&#x27;between(t,16,20)&#x27;[v]" -vsync 2 -map &#xA;[v] -map [a] out.mp4&#xA;</text3>

  


  But, need help in replacing the audio of middle segment clips c0.mp4 & f.mp4 with the audio from bgm.mp3 which will be given as a new input.

  


  Appreciate all the help..