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• JavaCV FFmpegFrameGrabber output video has incomplete audio

  15 juin 2016, par Diego Perozo

  I’m trying to write a program and part of it is supposed to take an ArrayList of BufferedImage objects and an audio file to create a movie.

  Here’s the code that does that :

  import java.awt.image.BufferedImage;
  
  import java.util.ArrayList;
  
  
  
  import org.bytedeco.javacpp.opencv_core.IplImage;
  
  import org.bytedeco.javacv.FFmpegFrameGrabber;
  
  import org.bytedeco.javacv.FFmpegFrameRecorder;
  
  
  
  public class Recorder {
  
      public static void Record(ArrayList<bufferedimage> charFrames, double fps, double frameLength, String outputPath) {
  
          FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputPath,Painter.imgx,Painter.imgy); 
  
          FFmpegFrameGrabber audioGrabber = new FFmpegFrameGrabber("audio/outputaudio.mp3");
  
          try {
  
              audioGrabber.start();
  
          } catch (org.bytedeco.javacv.FrameGrabber.Exception e1) {
  
              e1.printStackTrace();
  
          }
  
          try {
  
              recorder.setVideoQuality(12.5);
  
              recorder.setVideoCodec(13);
  
              recorder.setFormat("mp4");
  
              recorder.setFrameRate(fps);
  
              recorder.setSampleRate(audioGrabber.getSampleRate());
  
              recorder.setAudioChannels(2);
  
              recorder.start();
  
              System.out.println();
  
          for (int i=0;i (double)(frameLength))*10000))/100);
  
              sb1.append("%");
  
              System.out.println(sb1.toString());
  
          }
  
              recorder.stop(); 
  
              audioGrabber.stop();
  
          } 
  
          catch (Exception e){ 
  
              e.printStackTrace(); 
  
          }
  
      }
  
  }
  
  </bufferedimage>

  The problem is that this code outputs a video file which displays the video perfectly but only plays the audio for the first 3 seconds (when tested with the audio and frames of a five-second-long video). Thanks in advance for any help.

• 2 video decoding with same bitrate android inspired from grafika/fadden

  9 mars 2016, par Bee

  How to do double decoding(2 videos decoding) with same bit rate android ? I mean I want to play 2 videos in 2 different views but syncronisedly. I found this grafika double decoder. But it is not with same bitrate.
  The documentation says that.
  Any one know any sample project or guideline that I can follow ? Or maybe just can illustrate the steps I have to do ? May be used ffmpeg or something else ? Can anyone plese help me ?

• how do I only output a single video stream per HLS output

  20 octobre 2018, par Marc Archenault

  I have successfully output 3 HLS output using -map 360, 720 & 1080p. My source file is 540p. once generated I use ffprobe on the newly created 360.ts, 720.ts, and 1080.ts and notice that there is a second video channel. This channel is the input video. How do I have FFmpeg not output the original video as part of the output ?

  this is the ffprobe on 360.ts

  Stream #0:0[0x100] : Video : h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  Stream #0:10x101 : Audio : aac ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 100 kb/s
  Stream #0:2[0x102] : Video : h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc

  This is the FFmpeg command

  %ffmpeg% -loglevel fatal -threads %threads% -hide_banner -y -i %input% -i %overlayImg%^
  -filter_complex "[1]colorchannelmixer=aa=%thumbopacity%,scale=iw*%thumbscale% :-1[wm] ;[0:v][wm]overlay=(main_w-overlay_w)-36 :(main_h-overlay_h)-21,split=4[a][b][c][d] ;[a]scale=w=640:h=360:force_original_aspect_ratio=decrease[a] ;[b]scale=w=1280:h=720:force_original_aspect_ratio=decrease[b] ;[c]scale=w=1920:h=1080:force_original_aspect_ratio=decrease[c] ;[d]scale=w=1280:h=720:force_original_aspect_ratio=decrease[d]"^
  -map "[a]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -movflags +faststart -tune film -crf %crf% -preset %preset% -sc_threshold 0 -g 72 -keyint_min 72 -hls_time 4 -hls_playlist_type vod -b:v 800k -maxrate 856k -bufsize 1200k -b:a 96k -hls_flags single_file^
  %output%\360p.m3u8^
  -map "[b]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -movflags +faststart -tune film -crf %crf% -preset %preset% -sc_threshold 0 -g 72 -keyint_min 72 -hls_time 4 -hls_playlist_type vod -b:v 2800k -maxrate 2996k -bufsize 4200k -b:a 128k -hls_flags single_file^
  %output%\720p.m3u8^
  -map "[c]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -movflags +faststart -tune film -crf %crf% -preset %preset% -sc_threshold 0 -g 72 -keyint_min 72 -hls_time 4 -hls_playlist_type vod -b:v 5000k -maxrate 5350k -bufsize 7500k -b:a 192k -hls_flags single_file^
  %output%\1080p.m3u8^
  -map "[d]" -map 0 -c:a aac -ar 48000 -c:v h264 -profile:v main -preset %preset%^
  %output%\720.mp4^
  -map 0:v -y -ss 0.5 -vframes 1 -s %thumbsize% -ss 30^
  %outputthumb%

  thank you.