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• How to generating waveform from video & show it with video

  25 novembre 2016, par Salil

  We are using Rails as a backend & AngularJS on Front End side in my App where we need to show Video & audio waveform of that video.

  We are using ’wavesurfer.js’ to show the waveform on Front End side & ’node-pcm’ to generate pcm from video file on BackEnd side.

  This is working as expected but in some of the videos while creating waveform from pcm data instead of showing small sine waves we get flat line.
  Also it takes too much time to show the waveform for every page reload.

  To overcome this issue we are planning to create waveform image using ffmpeg

  ffmpeg -i 'https://s3.amazonaws.com/aadasdsadsadasdas/xyz.mp4' -filter_complex showwavespic -frames:v 1 output.png

  This is working fine but it also takes too much time (Ofcourse only once ) to generate the image for remote video (i.e. We are saving videos on S3)

  Problem with this i don’t get any library to integrate the waveform image with the Video.

  Can someone suggest any better approach related to this.

• android:video watermark show error

  27 avril 2016, par Sakibmohammad Syed

  I want to watermark video and below is my code but when I try to run then it show error like Failed to validate license file, existing!.

      public class MainActivity extends AppCompatActivity {
  
      private String strAudioFolderPath;
  
      @Override
  
      protected void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
  
  
          // here my ffmpeg command to watermark video.
  
          String s = "ffmpeg -i /sdcard/Download/testing.mp4 -i /sdcard/temp1.jpg -filter_complex 'overlay=10:main_h-overlay_h-10' /sdcard/Download/out.mp4";
  
  
  
          GeneralUtils.deleteFileUtil(strAudioFolderPath + "vk.log");
  
          PowerManager powerManager = (PowerManager) this.getSystemService(Activity.POWER_SERVICE);
  
          PowerManager.WakeLock wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "VK_LOCK");
  
          wakeLock.acquire();
  
          LoadJNI vk = new LoadJNI();
  
          try {
  
              try {
  
                  vk.run(GeneralUtils.utilConvertToComplex(s), strAudioFolderPath, MainActivity.this);
  
                  Log.e("Checking water marker", ">>>>>>>>>>>>>>>");
  
  
  
              } catch (Throwable e) {
  
              } finally {
  
                  if (wakeLock.isHeld())
  
                      wakeLock.release();
  
                  else {
  
                  }
  
              }
  
          } catch (Exception e)
  
          {
  
              e.printStackTrace();
  
          }        
  
      }
  
  }

  and error show in logcat like below.

      04-26 17:13:18.211 20492-20492/com.example.android.watermarkvideo I/Videokit: license file not found...
  
  04-26 17:13:18.211 20492-20492/com.example.android.watermarkvideo I/Videokit: license file /sdcard/Download/testing.mp4/ffmpeglicense.lic not created.
  
  04-26 17:13:18.211 20492-20492/com.example.android.watermarkvideo D/Videokit: license check rc: -3
  
  04-26 17:13:18.211 20492-20492/com.example.android.watermarkvideo E/Videokit: Failed to validate license file, existing!

  Actually I have used ffmpeg library to watermak on video file but it is not woking as well as I have not find any proper solution so please help.
  Thanks in advance.

• Convert a Video that it can show with preview in telegram via bot api

  7 avril 2016, par siavashg

  I Have a video and i want to send it with telegram bot api by pytelegrambotapi library so i write this code for send video by bot :

  import telebot
  
  
  
  bot = telebot.TeleBot("TOKEN")
  
  
  
  @bot.message_handler(commands=['start'])
  
  def send_welcome(message):
  
      video = open('1.mp4', 'rb')
  
      bot.send_video(message.chat.id,video, duration=)
  
  
  
  bot.polling(none_stop=True)

  but I send a video and it has been sent successfully but telegram show black screen for my video like this picture
  Telegram With Black Scrreen preview of video.
  I think this is about the encoding . I found this site for encoding and it said the videos in telegram have specific format.

  Conditions to trim a video

  • Audio codec = mp4a
  • Video codec = supported by the device
  • Any side of the video more than 640px
  • Or if a side is less than 640px but video codec is h264

  Conditions to compress a video

  • Any side of the video over 640px
  • Audio codec = mp4a
  • A video encoder different than :
  • OMX.google.h264.encoder
  • OMX.ST.VFM.H264Enc
  • OMX.Exynos.avc.enc
  • OMX.MARVELL.VIDEO.HW.CODA7542ENCODER
  • OMX.MARVELL.VIDEO.H264ENCODER

  How can I send Video with blur image preview of that in telegram with telegram bot api ?