Recherche avancée

Sur d’autres sites (11868)

• Trim video length in Android with javacv and ffmpeg

  11 juillet 2017, par Morya Yaroslav

  I’m trying to trim video length with ffmpeg implementation of FrameGrabber and FrameRecorder, but getting corrupted file of smaller size then it’s going to be. Maybe there is other way to trim video from start time to end time, also updating trim progress. Seems like it’s not recording changes between frames. Maybe there are some other ways to trim videos of different formats like mp4, flv and others. Here is code snippet :

          FrameGrabber grabber = new FFmpegFrameGrabber(mClip.getPath());
  
          grabber.start();
  
          grabber.setTimestamp(mClip.getClipStartMs()); // Write from specific moment
  
  
  
          File out = new File(mClip.getOutPutPath(params[0])); // Set destination to write
  
          FrameRecorder recorder = new FFmpegFrameRecorder(out, grabber.getImageWidth(), grabber.getImageHeight());
  
  
  
  
  
          recorder.setFormat(grabber.getFormat());
  
          recorder.setFrameRate(grabber.getFrameRate());
  
          recorder.setSampleRate(grabber.getSampleRate());
  
          recorder.setAspectRatio(grabber.getAspectRatio());
  
          recorder.setSampleFormat(grabber.getSampleFormat());
  
  
  
          recorder.setAudioCodec(grabber.getAudioCodec());
  
          recorder.setAudioBitrate(grabber.getAudioBitrate());
  
          recorder.setAudioChannels(grabber.getAudioChannels());
  
  
  
          recorder.setVideoCodec(grabber.getVideoCodec());
  
          recorder.setVideoBitrate(grabber.getVideoBitrate());
  
  
  
          recorder.start();
  
  
  
          Frame frame;
  
          Long timestamp;
  
          Long fullLength = mClip.getClipEndMs() - mClip.getClipStartMs();
  
          double percent = 0d, oldPercent = 0d;
  
  
  
          while ((frame = grabber.grabFrame()) != null && (timestamp = grabber.getTimestamp()) <= mClip.getClipEndMs()) {
  
              Log.d(ASYNC_SAVE_TAG, "Started command : ffmpeg " + mClip.toString());
  
  
  
              if (timestamp != 0d) {
  
                  oldPercent = percent;
  
                  percent = timestamp.doubleValue() / fullLength.doubleValue();
  
                  if (MathUtil.compare(percent, oldPercent) != 0) {
  
                      publishProgress(percent);
  
                  }
  
              }
  
  
  
              recorder.setTimestamp(grabber.getTimestamp() - mClip.getClipStartMs());
  
              recorder.record(frame);
  
          }
  
  
  
          grabber.close();
  
          recorder.close();

• How to transcode .mp4 files using ffmpeg celery rabbitMq in Amazon Linux ?

  11 mars 2017, par Srinivas 25

  I want to transcode .mp4, .flv files by using ffmpeg, celery and rabbitMQ. With the help of these tools i can able to transcode in localhost, where in
  my OS is ubuntu, but i am unable to do the same on AWS Linux for production
  Here is the code i am using to integrate ffmpeg, rabbitMQ and celery to transcode on Amazon Linux

  FFMPEG_PATH = '/usr/bin/ffmpeg'
  
  
  
  
  
  CELERY_BROKER_URL = 'amqp://guest:guest@awsuser:5672//'
  
  CELERY_ACCEPT_CONTENT = 'file'
  
  CELERY_RESULT_BACKEND = 'rpc://'
  
  CELERY_TASK_SERIALIZER = 'file'

  celery.py

  from __future__ import absolute_import
  
  import os
  
  from celery import Celery
  
  from afnity.settings import CELERY_BROKER_URL
  
  
  
  os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'afnity.settings')
  
  
  
  
  
  app = Celery('taskapp',
  
           broker=CELERY_BROKER_URL,
  
           include=['taskapp.tasks'])
  
  
  
  app.config_from_object('django.conf:settings', namespace='CELERY')
  
  
  
  
  
  if __name__ == '__main__':
  
  app.start()

  tasks.py

  from .celery import app
  
  
  
  @app.task
  
  def add()
  
   return(3+4d)

• avformat/argo_brp : support MASK streams

  25 septembre 2020, par Zane van Iperen

  avformat/argo_brp : support MASK streams
  We can't actually use them though.
  Signed-off-by : Zane van Iperen <zane@zanevaniperen.com>
  

  • [DH] libavformat/argo_brp.c