Recherche avancée

Sur d’autres sites (11306)

• Unable to get the original quality after resizing in ffmpeg

  24 septembre 2018, par Sabha

  I am trying to resize a high res video into 480x ??? and with to maintain aspect ratio and also without losing quality. I wish to maintain the original quality of the video. I tried this command line but it loses quality.

  ffmpeg -i a.mp4 -filter:v scale=480:-1 -c:a copy b.mp4

  I got some filters and options from google search such as -qscale,-sameq etc but it is not working.

  Can you please tell me the exact command ?

  Thanks

  EDIT : I also need to place two videos one below the other and wish to know if there is any such option in ffmpeg coz I cannot find anything on google.

• How can I use ffmpeg to convert all HEVC videos to h.264 videos only on linux ? [closed]

  13 juillet 2022, par Jayden Lo

  I am trying to import all my images and videos from Google Photos to Nextcloud. I used Google Takeout to download them, but some videos are in HEVC format, which is not supported by most devices. How can I batch convert all HEVC videos to h.264 ? I am using Ubuntu and here is my file structure :

  


  ./Photos/
  Image1.jpg
  Image2.jpg
  ...
  HEVC-Video1.mp4
  HEVC-Video2.mp4
  HEVC-Video3.mp4
  ...
  H.264-Video1.mp4
  H.264-Video2.mp4
  ...


  


  Thanks in advance.

  


• No Implementation Found for init method in Youtube Live Streaming Watch me project

  17 mai 2017, par Basha

  I am new to android development.presently I am Working on Youtube Live Streaming and downloaded watchMe project.I am getting the error in my class where I used to load FFMPEG libffmpeg.so file and the error was cannot resolve "init" method. and getting error while running the application as below

  java.lang.UnsatisfiedLinkError: No implementation found for boolean com.google.sai.apps.watchme.Ffmpeg.init(int, int, int, java.lang.String) (tried Java_com_google_sai_apps_watchme_Ffmpeg_init and Java_com_google_sai_apps_watchme_Ffmpeg_init__IIILjava_lang_String_2)
  
                                                                                       at com.google.sai.apps.watchme.Ffmpeg.init(Native Method)
  
                                                                                       at com.google.sai.apps.watchme.VideoStreamingConnection.open(VideoStreamingConnection.java:71)
  
                                                                                       at com.google.sai.apps.watchme.StreamerService.startStreaming(StreamerService.java:73)
  
                                                                                       at com.google.sai.apps.watchme.StreamerActivity.startStreaming(StreamerActivity.java:163)
  
                                                                                       at com.google.sai.apps.watchme.StreamerActivity.access$200(StreamerActivity.java:39)
  
                                                                                       at com.google.sai.apps.watchme.StreamerActivity$1.onServiceConnected(StreamerActivity.java:55)
  
                                                                                       at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1223)
  
                                                                                       at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1240)
  
                                                                                       at android.os.Handler.handleCallback(Handler.java:739)
  
                                                                                       at android.os.Handler.dispatchMessage(Handler.java:95)
  
                                                                                       at android.os.Looper.loop(Looper.java:148)
  
                                                                                       at android.app.ActivityThread.main(ActivityThread.java:5438)
  
                                                                                       at java.lang.reflect.Method.invoke(Native Method)
  
                                                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:762)
  
                                                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
  
      05-17 11:31:41.415 23434-25678/com.google.sai.apps.watchme E/ImageFetcher: Error in downloadBitmap - java.io.FileNotFoundException: https://i.ytimg.com/vi/FFvfpXcOpYk/default_live.jpg

  and FFMPEG class was

  public class Ffmpeg {
  
  
  
  
  
      static {
  
          System.loadLibrary("ffmpeg");
  
      }
  
  
  
  
  
      public static native boolean init(int width, int height, int audio_sample_rate, String rtmpUrl);
  
  
  
      public static native void shutdown();
  
  
  
      // Returns the size of the encoded frame.
  
      public static native int encodeVideoFrame(byte[] yuv_image);
  
  
  
      public static native int encodeAudioFrame(short[] audio_data, int length);
  
  }

  please someone help me.