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• correct way to download a mp4 [Audio only] file as a mp3 file via php

  3 février 2018, par Kapil

  I am asking this question because i found it impossible as far my knowledge stands. However i believe here on stackoverflow a lot of genius persons visits so maybe someone can give a good advice / trick.

  My problem is, I am downloading a audio/mp4 file of youtube hosted on googlevideo.com’s server.

  My PHP code for this purpose :
  $mp3path is url of video

  header('Content-Description: File Transfer');
  
  if(strpos($mp3path, "https://") === false) {
  
      header('Content-length: ' . size($mp3path)); //size is custom function
  
  } 
  
      header("Content-Type: audio/MP4A-LATM, audio/MP4A, audio/m4a, audio/mp4, audio/mp4a, audio/mp4-audio, audio/mpeg"); 
  
      header('Content-Type: application/force-download');
  
      header("Accept-Ranges: bytes");
  
      header('Content-Transfer-Encoding: binary'); 
  
      header('Content-disposition: attachment; filename="'.$title.'.mp3"'); 
  
      header('Connection: Keep-Alive');
  
      header('Expires: 0');
  
      header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
  
      header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
  
      header("Cache-Control: private", false);
  
      header('Pragma: no-cache');
  
      readfile($mp3path);
  
      exit;

  I can download this audio file but few mp3 players are not able to play it when i did some research on by using mp3val [mp3val.sourceforge.net]. I found this file do not contain sample-rate, bit-rate or some other required codecs inside the file.
  Error received from mp3val : Unknown file format

  I know one possible way of doing this which is ffmpeg but i am looking for a less time consuming option of doing this because first ffmpeg download the whole file and then convert it to mp3 and save it on server. It takes a lot of time.

  I am looking for a easiest solution in which, i dont want to save the whole file on my server. I want to call this file from remote server and want to add sample rate, bit-rate in the file and then just somehow with php i want to start download on browser.

  All i mean to say i need a faster solution. I have seen 2 yt to mp3 converter, They are doing the same thing, giving instant download. i dont know how ?

  Please if you think its a stupid question or not possible then dont report to stackoverflow. I am trying to figure it out that’s why i am asking this question here. I hope you’ll understand my curiosity.

  Thanks,

• React-native 0.60 - FFMPEG - Images to Video

  28 septembre 2019, par iSaBo

  i want to generate a video with FFMPEG from an image sequence in React-native. After i generate the Video, the video will not displayed with react-native-video. If i export the video on my PC, the video will also not displayed.

  I have tried the command, which i use in react-native, execute on my windows CMD. there it works. I get an video with the input images

  My generate Code :

  RNFFmpeg.enableLogCallback( this.logCallback );
  
  RNFFmpeg.enableStatisticsCallback( this.statisticsCallback );
  
  
  
  const path = RNFS.DocumentDirectoryPath + "/app/" + this.state.galleryName;
  
  
  
  // Full-CMD: -framerate 2 -i /data/user/0/com.app/files/app/Testhh/images/image%6d.jpg -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2,format=yuv420p" /data/user/0/com.app/files/app/Testhh/videos/video0000.mp4
  
  const ffmpegCommand =
  
      // Images
  
      '-framerate 2 -i ' + path + '/images/image%6d.jpg '
  
      // Video Options
  
      + '-vf "pad=ceil(iw/2)*2:ceil(ih/2)*2,format=yuv420p" '
  
      + path + '/videos/video0000.mp4';
  
  
  
  console.log( ffmpegCommand );
  
  
  
  RNFFmpeg.execute( ffmpegCommand ).then((result) => {
  
  
  
      this.setState({
  
          inGenerateVideo: false
  
      });
  
  
  
  }).catch(( err ) => {
  
  
  
      this.setState({
  
          inGenerateVideo: false
  
      });
  
  
  
      // TODO Error
  
      console.log( err );
  
  
  
  });

  After that, i want to display the video with react-native-video

  <video source="{{uri:"></video>//data/user/0/com.app/files/app/Test/videos/video0000.mp4' }}   
  
       ref={(ref) => {
  
          this.player = ref 
  
       }}
  
       autoplay={false}
  
       paused={true}
  
       onBuffer={this.onBuffer}                
  
       onError={this.videoError}               
  
       style={styles.backgroundVideo} />

  Error from react-native-image :

  extra: -2147483648
  
  what: 1

  The expected behavior is that I actually get a video, which was staged with FFMPEG, by means of . However, nothing is displayed. The return code of FFMPEG is 0.
  The Full FFMPEG Command is :

  -framerate 2 -i /data/user/0/com.app/files/app/Testhh/images/image%6d.jpg -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2,format=yuv420p" /data/user/0/com.app/files/app/Testhh/videos/video0000.mp4

  i Hope someone can help me or has an example, to generate images to an video in react-native.

  Thank you

• 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();
  
      }