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• How can I extract the characteristics of multimedia video stream while the video is streaming ?

  10 mai 2021, par Kai

  I have built adaptive video streaming ,DASH, over SDN network and was wondering if I can get some video characteristics while the video is streaming. I have used youtube_dl and was able to get the received video after the completion of the stream however, I want to get the video characteristics such as (stream size, bitrate, frame rate, resolution and etc.) while streaming. I hope that you can provide me with a script to extract and generate a file that contains such information.

  


• batch ffmpeg conversion (aspect, crop, and concatenate) and naming based on subfolder

  3 avril 2015, par hordor

  TYIA for any help !

  Seems I have a somewhat complicated, multi-step process. If you can help any part of it that would be appreciated.

  What I hope to accomplish

  1. Example of folder/file is here : https://mega.co.nz/#F !RJRWRLTJ !c6b-z3Vl-Tlh0uGbCflx7Q
  2. I have many subfolders that each contain 7 files from a DVD (originally PAL-encoded I think). I only care about the VTS_01_1.VOB AND VTS_01_2.VOB files. The two files together are one match
  3. The videos are stretched (from 4:3 to 16:9) and letterboxed. I want to undo that
  4. The future title of the final MP4 video should be the name of the folder
  5. BONUS : title of the video should also include the folder before it (e.g. "Friday H2 G1 CAN - BEL.mp4")

  I’d like to do this via batch file because there are a lot of folders.

  What I have done :

  dir/b/s *.vob | findstr /v VIDEO | findstr /v 01_ >list.txt
  
  
  
  @echo off
  
  for %%i in list.txt 
  
  do   
  
    ffmpeg -i VTS_01_1.VOB -aspect 4:3 "%%~pi\v1step1.mp4"
  
    ffmpeg -i vob1.mp4 -vf "crop=704:432:10:72" "%%~pi\v1step2.mp4"
  
    ffmpeg -i vob11.mp4 -c copy "%%~pi\v1step3.ts"
  
    ffmpeg -i VTS_01_2.VOB -aspect 4:3 "%%~pi\v2step1.mp4"
  
    ffmpeg -i vob2.mp4 -vf "crop=704:432:10:72" "%%~pi\v2step2.mp4"
  
    ffmpeg -i vob22.mp4 -bsf h264_mp4toannexb -c copy "%%~pi\v2step3.ts"
  
    ffmpeg -i "concat:v1step3.ts|v2step3.ts" -c copy file.mp4 "%%~pi\Match.mp4"
  
  
  
  @echo on
  
  pause

  Problem with current code

  1. Doesn’t start converting (can’t see error message either)
  2. Doesn’t have the file naming that I want
  3. A lot of steps in conversation - can that be simplified ?
  4. Not sure why it wanted the -bsf command for the second conversion but not the first

  Apologies if I’d made basic mistakes. I’m a big newbie and just to get this far has taken me hours of research. Thanks again !

• Merging mp4 and mp3 on Android using FFmpeg

  4 janvier 2015, par user3568918

  i am developing a video capturing Android App.
  My Goal is to merge the captured Video file with a given mp3 audio file. I am using FFmpeg to merge the files. The capturing is done with the Android.Media Framework.
  If i now try to merge the files like descripted here :

  How to multiplex mp3 and mp4 files in Android

  i get the error : avcodec_open2() error -1: Could not open video codec.

  Is there a way to convert the captured video file in a readable version for FFmpeg ?
  Or is there any other way to solve this issue ?

  i Dont want to capture the video with FFmpeg, caus this will be to much complex and not clean (for my opinion)

  Hope that any body can help :)
  thanks in advance.

  I Capture like propsed in the android DOC :

  http://developer.android.com/guide/topics/media/camera.html

  and this is how i try to merge

      FrameGrabber grabber1 = new FFmpegFrameGrabber(videoPath);
  
      FrameGrabber grabber2 = new FFmpegFrameGrabber(audioPath);
  
      grabber1.start();
  
      grabber2.start();
  
      FrameRecorder recorder = new FFmpegFrameRecorder(OutputPath,grabber1.getImageWidth(), grabber1.getImageHeight(), 2);
  
      recorder.setFormat("mp4");
  
      recorder.setVideoQuality(1);
  
      recorder.setFrameRate(grabber1.getFrameRate());
  
      recorder.setSampleRate(grabber2.getSampleRate());
  
      recorder.start();
  
      Frame frame1, frame2 = null;
  
      long timestamp = -2;
  
      int count = 0;
  
      boolean isFirstTime = false;
  
      boolean isFirstCheck = true;
  
      while ((frame1 = grabber1.grabFrame())!=null) {
  
          //frame1 = grabber1.grabFrame();
  
          frame2 = grabber2.grabFrame();
  
          recorder.record(frame1);
  
          recorder.record(frame2);
  
      }
  
      recorder.stop();
  
      grabber1.stop();
  
      grabber2.stop();
  
      }catch (org.bytedeco.javacv.FrameGrabber.Exception e) {
  
          e.printStackTrace();
  
      } catch (Exception e1) {
  
          e1.printStackTrace();
  
      }