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• libaomenc : fix profile setting

  29 mars 2018, par James Almer

  libaomenc : fix profile setting
  Main Profile is yuv420p 8 and 10 bit
  
  High Profile is yuv444p 8 and 10 bit
  
  Professional Profile is yuv422p 8, 10, and 12 bit, plus every other pixfmt at 12 bit
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DBH] libavcodec/libaomenc.c

• pydub.exceptions.CouldntDecodeError : Decoding failed. ffmpeg returned error code : 1

  9 avril, par azail765

  This script will work on a 30 second wav file but not a 10 minutes phone call also in wav format. Any help would be appreciated

  


  I've downloaded ffmpeg.

  


  # Import necessary libraries 
from pydub import AudioSegment 
import speech_recognition as sr 
import os
import pydub


chunk_count = 0
directory = os.fsencode(r'C:\Users\zach.blair\Downloads\speechRecognition\New folder')
# Text file to write the recognized audio 
fh = open("recognized.txt", "w+")
for file in os.listdir(directory):
     filename = os.fsdecode(file)
     if filename.endswith(".wav"):
        chunk_count += 1
             # Input audio file to be sliced 
        audio = AudioSegment.from_file(filename,format="wav") 
          
        ''' 
        Step #1 - Slicing the audio file into smaller chunks. 
        '''
        # Length of the audiofile in milliseconds 
        n = len(audio) 
          
        # Variable to count the number of sliced chunks 
        counter = 1
          
         
          
        # Interval length at which to slice the audio file. 
        interval = 20 * 1000
          
        # Length of audio to overlap.  
        overlap = 1 * 1000
          
        # Initialize start and end seconds to 0 
        start = 0
        end = 0
          
        # Flag to keep track of end of file. 
        # When audio reaches its end, flag is set to 1 and we break 
        flag = 0
          
        # Iterate from 0 to end of the file, 
        # with increment = interval 
        for i in range(0, 2 * n, interval): 
              
            # During first iteration, 
            # start is 0, end is the interval 
            if i == 0: 
                start = 0
                end = interval 
          
            # All other iterations, 
            # start is the previous end - overlap 
            # end becomes end + interval 
            else: 
                start = end - overlap 
                end = start + interval  
          
            # When end becomes greater than the file length, 
            # end is set to the file length 
            # flag is set to 1 to indicate break. 
            if end >= n: 
                end = n 
                flag = 1
          
            # Storing audio file from the defined start to end 
            chunk = audio[start:end] 
          
            # Filename / Path to store the sliced audio 
            filename = str(chunk_count)+'chunk'+str(counter)+'.wav'
          
            # Store the sliced audio file to the defined path 
            chunk.export(filename, format ="wav") 
            # Print information about the current chunk 
            print(str(chunk_count)+str(counter)+". Start = "
                                +str(start)+" end = "+str(end)) 
          
            # Increment counter for the next chunk 
            counter = counter + 1
              
          
            AUDIO_FILE = filename 
            
            # Initialize the recognizer 
            r = sr.Recognizer() 
          
            # Traverse the audio file and listen to the audio 
            with sr.AudioFile(AUDIO_FILE) as source: 
                audio_listened = r.listen(source) 
          
            # Try to recognize the listened audio 
            # And catch expections. 
            try:     
                rec = r.recognize_google(audio_listened) 
                  
                # If recognized, write into the file. 
                fh.write(rec+" ") 
              
            # If google could not understand the audio 
            except sr.UnknownValueError: 
                    print("Empty Value") 
          
            # If the results cannot be requested from Google. 
            # Probably an internet connection error. 
            except sr.RequestError as e: 
                print("Could not request results.") 
          
            # Check for flag. 
            # If flag is 1, end of the whole audio reached. 
            # Close the file and break.                  
fh.close()    


  


  I get this error on audio = AudioSegment.from_file(filename,format="wav") :

  


  Traceback (most recent call last):&#xA;  File "C:\Users\zach.blair\Downloads\speechRecognition\New folder\speechRecognition3.py", line 17, in <module>&#xA;    audio = AudioSegment.from_file(filename,format="wav")&#xA;  File "C:\Users\zach.blair\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pydub\audio_segment.py", line 704, in from_file&#xA;    p.returncode, p_err))&#xA;pydub.exceptions.CouldntDecodeError: Decoding failed. ffmpeg returned error code: 1&#xA;</module>

  


  Output from ffmpeg/avlib :

  


    ffmpeg version N-95027-g8c90bb8ebb Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20190918
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 35.100 / 56. 35.100
  libavcodec     58. 58.101 / 58. 58.101
  libavformat    58. 33.100 / 58. 33.100
  libavdevice    58.  9.100 / 58.  9.100
  libavfilter     7. 58.102 /  7. 58.102
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, wav, from '2a.wav.wav':
  Duration: 00:09:52.95, bitrate: 64 kb/s
    Stream #0:0: Audio: pcm_mulaw ([7][0][0][0] / 0x0007), 8000 Hz, mono, s16, 64 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_mulaw (native) -> pcm_s8 (native))
Press [q] to stop, [?] for help
[wav @ 0000024307974400] pcm_s8 codec not supported in WAVE format
Could not write header for output file #0 (incorrect codec parameters ?): Function not implemented
Error initializing output stream 0:0 -- 
Conversion failed!


  


• Video capturing in portrait mode but the orientation is wrong when played back with a media player

  17 octobre 2016, par Ahmed Mujtaba

  I’m trying to make a custom video app. The app captures a video using mediarecorder and uploads it to the website where it’s played on a html5 media player. The issue is that, when I capture the video in portrait mode, the playback video on the website and on vlc player have it’s orientation off by 90 degrees. I have tried various solution on the internet but none work for me.

  Here’s what my code for setting up the media recorder :

   private bool prepareMediaRecorder() {
  
  
  
          Android.Hardware.Camera.Parameters p = mCamera.GetParameters();
  
          List previewSizes = p.SupportedPreviewSizes.ToList();
  
  
  
          //mCamera = GetCameraInstance();
  
          //setCameraDisplayOrientation(Activity, cameraId, mCamera);
  
  
  
          mediaRecorder = new MediaRecorder();
  
          mCamera.Unlock();
  
          mediaRecorder.SetCamera(mCamera);
  
  
  
          mediaRecorder.SetAudioSource(AudioSource.Camcorder);
  
          mediaRecorder.SetVideoSource(VideoSource.Camera);
  
          mediaRecorder.SetOrientationHint(CameraS.result);
  
  
  
          if (currentapiVersion >= 16)
  
          {
  
              mediaRecorder.SetProfile(CamcorderProfile.Get(CamcorderQuality.High)); // requires API Level 8 or higher
  
          }
  
          else
  
          {
  
              mediaRecorder.SetProfile(CamcorderProfile.Get(CamcorderQuality.Q480p)); // requires API Level 8 or higher
  
          }
  
  
  
          //mediaRecorder.SetVideoFrameRate(30);
  
          mediaRecorder.SetOutputFile(localPath);
  
          mediaRecorder.SetMaxDuration(600000); // Set max duration 60 sec.
  
          mediaRecorder.SetMaxFileSize(50000000); // Set max file size 50M
  
          mediaRecorder.SetVideoSize(previewSizes[0].Width, previewSizes[0].Height);
  
          mediaRecorder.SetPreviewDisplay(mPreview.Holder.Surface);
  
  
  
          mediaRecorder.SetOrientationHint(getDisplayOrientationAngle());
  
  
  
          try
  
          {
  
              mediaRecorder.Prepare();
  
          }
  
          catch (IllegalStateException e)
  
          {
  
              releaseMediaRecorder();
  
              return false;
  
          }
  
          catch (Java.IO.IOException e)
  
          {
  
              releaseMediaRecorder();
  
              return false;
  
          }
  
          return true;
  
  
  
  }
  
  
  
  public int getDisplayOrientationAngle() {
  
          //Log.e("", "setDisplayOrientationAngle is call");
  
          int angle;
  
  
  
  
  
          var mDisplayRotation = Activity.WindowManager.DefaultDisplay.Rotation;
  
          // switch (MeasurementNativeActivity.DisplayRotation) {
  
          switch (mDisplayRotation)
  
          {
  
              case SurfaceOrientation.Rotation0: // This is display orientation
  
                  angle = 90; // This is camera orientation
  
                  break;
  
              case SurfaceOrientation.Rotation90:
  
                  angle = 0;
  
                  break;
  
              case SurfaceOrientation.Rotation180:
  
                  angle = 270;
  
                  break;
  
              case SurfaceOrientation.Rotation270:
  
                  angle = 180;
  
                  break;
  
              default:
  
                  angle = 90;
  
                  break;
  
          }
  
          //Log.v("", "media recorder displayRotation: " + mDisplayRotation);
  
          //Log.v("", "media recorder angle: " + angle);
  
          return angle;
  
  
  
  }

  The orientation of the video is fine when played on the phone app but on the website it’s not. I tried to use FFMPEG encoder to rotate the video clockwise. This seemed to fix the orientation of the video, however the aspect ratio of the video is all messed up. The video is stretched vertically and goes off screen.
  The command I’m using to rotate and encode the video is as follows :

  -y -i inputPath -vf scale=640:480,setsar=1,transpose=1 -strict experimental -r 25 -vcodec mpeg4 -b 1000k ab 48000 -ac 2 -ar 22050 destinationPath

  I will really appreciate if someone can help me fix either the orientation of the video or the aspect ration after encoding the video.

  Cheers !

  Edit.

  Here’s the readout of the input file :

  General
  
  Complete name                  : C:\Users\Ahmed\Desktop\9adcdb56-500e-4d3f-8fb2-ccf20c680422_yt.mp4
  
  Format                         : MPEG-4
  
  Format profile                 : Base Media
  
  Codec ID                       : isom
  
  File size                      : 6.30 MiB
  
  Duration                       : 12s 437ms
  
  Overall bit rate               : 4 251 Kbps
  
  Encoded date                   : UTC 2016-05-29 23:54:30
  
  Tagged date                    : UTC 2016-05-29 23:54:30
  
  
  
  Video
  
  ID                             : 1
  
  Format                         : AVC
  
  Format/Info                    : Advanced Video Codec
  
  Format profile                 : Baseline@L3.1
  
  Format settings, CABAC         : No
  
  Format settings, ReFrames      : 1 frame
  
  Format settings, GOP           : M=1, N=31
  
  Codec ID                       : avc1
  
  Codec ID/Info                  : Advanced Video Coding
  
  Duration                       : 12s 323ms
  
  Bit rate                       : 3 967 Kbps
  
  Width                          : 1 280 pixels
  
  Height                         : 720 pixels
  
  Display aspect ratio           : 16:9
  
  Rotation                       : 90°
  
  Frame rate mode                : Variable
  
  Frame rate                     : 29.700 fps
  
  Minimum frame rate             : 29.354 fps
  
  Maximum frame rate             : 30.040 fps
  
  Color space                    : YUV
  
  Chroma subsampling             : 4:2:0
  
  Bit depth                      : 8 bits
  
  Scan type                      : Progressive
  
  Bits/(Pixel*Frame)             : 0.145
  
  Stream size                    : 5.83 MiB (92%)
  
  Title                          : VideoHandle
  
  Language                       : English
  
  Encoded date                   : UTC 2016-05-29 23:54:30
  
  Tagged date                    : UTC 2016-05-29 23:54:30
  
  
  
  Audio
  
  ID                             : 2
  
  Format                         : AAC
  
  Format/Info                    : Advanced Audio Codec
  
  Format profile                 : LC
  
  Codec ID                       : 40
  
  Duration                       : 12s 437ms
  
  Source duration                : 12s 454ms
  
  Bit rate mode                  : Constant
  
  Bit rate                       : 128 Kbps
  
  Nominal bit rate               : 96.0 Kbps
  
  Channel(s)                     : 2 channels
  
  Channel positions              : Front: L R
  
  Sampling rate                  : 48.0 KHz
  
  Compression mode               : Lossy
  
  Stream size                    : 194 KiB (3%)
  
  Source stream size             : 194 KiB (3%)
  
  Title                          : SoundHandle
  
  Language                       : English
  
  Encoded date                   : UTC 2016-05-29 23:54:30
  
  Tagged date                    : UTC 2016-05-29 23:54:30
  
  mdhd_Duration                  : 12454