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• JavaCV ffmpeg video/audio not syncing

  3 janvier 2024, par lukaking98

  i have cut two videos into multiple segments and i am trying to rearangle them randomly. The problem is that the audio wont sync properly... All the segments have the same frame rate, 30 fps, same resolution, same audio and video codec (AV_CODEC_ID_AAC, AV_CODEC_ID_H264) and same bitrate.

  


                  FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputFilePath, 1920, 1080);
                recorder.setFrameRate(30); 
                recorder.setFormat("mp4");              

                recorder.setAudioChannels(2); 
                recorder.setSampleRate(44100); 
                recorder.setAudioCodec(avcodec.AV_CODEC_ID_AAC); 
                recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
                recorder.setVideoBitrate(10_000_000); 

                recorder.start(); 
                
                Frame videoFrame;
                for (FFmpegFrameGrabber videoGrabber : videoGrabbers) {
                    videoGrabber.start();
                    while ((videoFrame = videoGrabber.grabFrame(true, true, true, false)) != null) { 
                        recorder.record(videoFrame);
                    }                                   
                }
                recorder.stop();
                recorder.release();  


  


  if i enable grabFrame boolean doAudio to true, the video would be 43s, if i disable the audio it would be 34s.
Also at the end the video ends at 34s and the audio continues until it finishes.

  


  Any way i can sync this so the audio matches the video perfectly ??

  


• How can I record video and clip into peace at the same time using ffmpeg ?

  19 septembre 2023, par Noisy-JohnSmith

  Here is my question, I need to implement a function that satisfy the following :

  


  

  1. Record your computer monitor(or any other video) into video in any format

  


  2. You have a button, every time you click the button, the process will ouput a 20 seconds clip with mp4 format.
.e.g :
I start a ffmpeg recording process at 00:00:00, and I click the button at 00:01:20, that will output a mp4 video from the Video recorded by step 1 from 60th second to 80th second

  


  3. The mp4 produce by step 2 is allow some bias for seconds. Maybe from 61st second to 79th second in step 2

  


  4. the clipping process is quick, need just few second

  


  


  Is there any way to implement this function ?

  


• Android - 360 video metadata

  11 mai 2017, par Xys

  So with ffmpeg I’ve concatenated two 360 videos into one. The problem is that I lost all the 360 video metadata in the final video (so it’s not recognized as a 360 video anymore). If I use exiftool on the final video, I lack those metadatas :

  • Spherical : true
  • Stitched : true
  • Stitching Software : Spherical Metadata Tool
  • Projection Type : equirectangular

  I’ve tried to inject those metadatas with ffmpeg, like this for example :

  ffmpeg -i  -metadata Spherical="true" -codec copy 

  I don’t get any errors doing that, but exiftool still doesn’t show the metadatas.

  I know Google has a Python script that does this well, here .

  But I would like to inject metadatas in my app as well, any help would be much appreciated,

  thanks !