Newest 'ffmpeg' Questions - Stack Overflow

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• Android video unplayable at iOS

  21 février 2017, par Atif Imran

  I've found that videos with codec H.264, MPEG-4 HE AAC V2 have no problem with my code here. But when I use a video of codec H.264, AAC (Sent from Android device) the videos are again black. Now my question is how do I convert a video to iOS playable codec.

• How to mix 3 audio files or more by ffmpeg and set volume each file

  20 février 2017, par Kwan N

  I use this code. But it's not success:

  ffmpeg -f lavfi -i "amovie=1.mp3,volume=1" -f lavfi -i "amovie=2.mp3,volume=0.3" -f lavfi -i "amovie=3.mp3,volume=1" -filter_complex amerge -ac 2 -c:a libmp3lame -q:a 4 output.mp3
  

• playing video in android using javacv ffmpeg

  20 février 2017, par d91

  I'm trying to play a video stored in sd card using javacv. Following is my code

  public class MainActivity extends AppCompatActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          playthevideo();
      }
  
      protected void playthevideo() {
  
         String imageInSD = "/storage/080A-0063/dama/" + "test3.mp4";
  
         FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(imageInSD);
  
         AndroidFrameConverter converterToBitmap = new AndroidFrameConverter();
  
         OpenCVFrameConverter.ToIplImage converterToipi = new OpenCVFrameConverter.ToIplImage();
  
             try {
                 Log.d("Tag", "try");
                 grabber.start();
                 Log.d("Tag", "started");
  
                 int i = 0;
                 IplImage grabbedImage = null;
  
                 ImageView mimg = (ImageView) findViewById(R.id.a);
  
                 grabber.setFrameRate(grabber.getFrameRate());
                 ArrayList bitmapArray = new ArrayList();
                 while (((grabbedImage = converterToipi.convert(grabber.grabImage())) != null)) {
  
                     Log.d("Tag", String.valueOf(i));
  
                     int width = grabbedImage.width();
  
                     int height = grabbedImage.height();
  
                     if (grabbedImage == null) {
                         Log.d("Tag", "error");
                     }
  
                     IplImage container = IplImage.create(width, height, IPL_DEPTH_8U, 4);
  
                     cvCvtColor(grabbedImage, container, CV_BGR2RGBA);
  
                     Bitmap bitmapnew = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
  
                     bitmapnew.copyPixelsFromBuffer(container.getByteBuffer());
  
                     if (bitmapnew == null) {
                         Log.d("Tag", "bit error");
                     }
  
                     mimg.setImageBitmap(bitmapnew);
  
                     mimg.requestFocus();
  
                     i++;
                 }
  
                 Log.d("Tag", "go");
  
             }
             catch(Exception e) {
  
            }
       }
  }
  

  just ignore the tags because those are only for my testing purposes.. When I run this code the main activity layout is still loading while android monitor shows the value of "i" (which is current frame number) and suddenly after frame number 3671 code exits the while loop and the imageview shows a frame which is not the end frame of that video(it somewhere around staring of the video). I was unable to find a way to show the grabbed frames from ffmpegframegrabber so i decided to show the image in imageview in this way. Can anybody tell me why I'm getting this error or another error non path to play and show the video in android activity? BTW javacv 1.3.1 is imported correctly into my android dev environment. Thanks.

• How to download live streaming videos with HTTP .flv url

  20 février 2017, par Sajjad Darvishi

  I just wanted to record a live stream by downloading this link but it did'nt work by curl , ffmpeg and wget please help me how can i record this?

  http://uhs-akamai.ustream.tv/dal09/dal09-uhs-live02/live/22505108/1487587571614/plain/uhs/1/chunk_1487590613_79324dc9f7.flv

• ffmpeg error : at least one output file must be specified

  20 février 2017, par Elsa Amri

  I'm trying to input this command to extract a video into frames:

  ffmpeg -i mirai.mpg -r 30 -t 2 -ss 0:00 -f image2_4%dpng

  But I keep getting this error: "At least one output file must be specified". I'm new to this, any help would be appreciated.

  UPDATE

  Solved, I removed the -f like you said. Thanks!