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• Facing issue with mp4Parser

  20 novembre 2014, par Rohit

  I am trying to trim video with the help of mp4Parser. In output am getting trimmed video but just before video finishes it give error "Sorry cant Play this video". Video am making is H264.

      public static void main(String args) throws IOException {
  
  
  
      Movie movie = new MovieCreator()
  
              .build(new RandomAccessFileIsoBufferWrapperImpl(
  
                      new File(
  
                              "/sdcard/Videos11/"+args+".mp4")));
  
  
  
      List<track> tracks = movie.getTracks();
  
      Log.e("Tracks","Following are the Tracks:- "+tracks);
  
      movie.setTracks(new LinkedList<track>());
  
      // remove all tracks we will create new tracks from the old
  
  
  
      double startTime = 0.000;
  
      double endTime = 6.000;
  
  
  
      boolean timeCorrected = false;
  
  
  
      // Here we try to find a track that has sync samples. Since we can only
  
      // start decoding
  
      // at such a sample we SHOULD make sure that the start of the new
  
      // fragment is exactly
  
      // such a frame
  
      for (Track track : tracks) {
  
          if (track.getSyncSamples() != null
  
                  &amp;&amp; track.getSyncSamples().length > 0) {
  
              if (timeCorrected) {
  
                  // This exception here could be a false positive in case we
  
                  // have multiple tracks
  
                  // with sync samples at exactly the same positions. E.g. a
  
                  // single movie containing
  
                  // multiple qualities of the same video (Microsoft Smooth
  
                  // Streaming file)
  
  
  
                  throw new RuntimeException(
  
                          "The startTime has already been corrected by another track with SyncSample. Not Supported.");
  
              }
  
              startTime = correctTimeToNextSyncSample(track, startTime);
  
              endTime = correctTimeToNextSyncSample(track, endTime);
  
              timeCorrected = true;
  
          }
  
      }
  
  
  
      for (Track track : tracks) {
  
          long currentSample = 0;
  
          double currentTime = 0;
  
          long startSample = -1;
  
          long endSample = -1;
  
  
  
          for (int i = 0; i &lt; track.getDecodingTimeEntries().size(); i++) {
  
              TimeToSampleBox.Entry entry = track.getDecodingTimeEntries().get(i);
  
              for (int j = 0; j &lt; entry.getCount(); j++) {
  
                  // entry.getDelta() is the amount of time the current sample
  
                  // covers.
  
  
  
                  if (currentTime &lt;= startTime) {
  
                      // current sample is still before the new starttime
  
                      startSample = currentSample;
  
                  }
  
                  if (currentTime &lt;= endTime) {
  
                      // current sample is after the new start time and still
  
                      // before the new endtime
  
                      endSample = currentSample;
  
                  } else {
  
                      // current sample is after the end of the cropped video
  
                      break;
  
                  }
  
                  currentTime += (double) entry.getDelta()
  
                          / (double) track.getTrackMetaData().getTimescale();
  
                  currentSample++;
  
              }
  
          }
  
          movie.addTrack(new CroppedTrack(track, startSample, endSample));
  
      }
  
  
  
      IsoFile out = new DefaultMp4Builder().build(movie);
  
  
  
      String filePath = "sdcard/test"+i+".mp4";
  
      i++;
  
      File f = new File(filePath);
  
      FileOutputStream fos = new FileOutputStream(f);
  
      BufferedOutputStream bos = new BufferedOutputStream(fos, 65535);
  
      out.getBox(new IsoOutputStream(fos));
  
      bos.close();
  
      fos.flush();
  
      fos.close();
  
  
  
  }
  
  
  
  private static double correctTimeToNextSyncSample(Track track,
  
          double cutHere) {
  
      double[] timeOfSyncSamples = new double[track.getSyncSamples().length];
  
      long currentSample = 0;
  
      double currentTime = 0;
  
      for (int i = 0; i &lt; track.getDecodingTimeEntries().size(); i++) {
  
          TimeToSampleBox.Entry entry = track.getDecodingTimeEntries().get(i);
  
          for (int j = 0; j &lt; entry.getCount(); j++) {
  
              if (Arrays.binarySearch(track.getSyncSamples(),
  
                      currentSample + 1) >= 0) {
  
                  // samples always start with 1 but we start with zero
  
                  // therefore +1
  
                  timeOfSyncSamples[Arrays.binarySearch(
  
                          track.getSyncSamples(), currentSample + 1)] = currentTime;
  
              }
  
              currentTime += (double) entry.getDelta()
  
                      / (double) track.getTrackMetaData().getTimescale();
  
              currentSample++;
  
          }
  
      }
  
      for (double timeOfSyncSample : timeOfSyncSamples) {
  
          if (timeOfSyncSample > cutHere) {
  
              return timeOfSyncSample;
  
          }
  
      }
  
      return timeOfSyncSamples[timeOfSyncSamples.length - 1];
  
  }
  
  </track></track>

  Making video of 30 seconds and want to trim first 6 seconds. Working but in last(between 5 to 6 sec) it shows Cant play this video. Any help will be appreciated.

• Pydub FFMPEG issue [closed]

  14 janvier, par Nikolai van den Hoven

  I am attempting to use FFMPEG with Pydub to create a program that chops .mp3 files into different words, each contained in their own .mp3 file, but when I run the script I am getting the following error :

  


  PS C:\Users\nik> & C:/Users/nik/AppData/Local/Microsoft/WindowsApps/python3.12.exe "d:/Python/Word Splitter.py"
C:\Users\nik\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.12_qbz5n2kfra8p0\LocalCache\local-packages\Python312\site-packages\pydub\utils.py:170: RuntimeWarning: Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work
  warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning)


  


  This is the code I am using.

  


  import os
from pydub import AudioSegment
from pydub.silence import split_on_silence
import speech_recognition as sr
AudioSegment.ffmpeg = r"D:\Python\ffmpeg\bin\ffmpeg.exe"
def mp3_to_words(mp3_file, output_folder):
    # Ensure output folder exists
    os.makedirs(output_folder, exist_ok=True)

    # Load MP3 file
    print("Loading audio file...")
    audio = AudioSegment.from_mp3(mp3_file)

    # Split audio into chunks using silence detection
    print("Splitting audio into chunks...")
    chunks = split_on_silence(
        audio,
        min_silence_len=200,  # Minimum silence duration in ms to consider as a split point
        silence_thresh=audio.dBFS - 14,  # Silence threshold relative to average loudness
        keep_silence=100  # Retain some silence in chunks
    )

    recognizer = sr.Recognizer()

    for i, chunk in enumerate(chunks):
        print(f"Processing chunk {i + 1}/{len(chunks)}...")

        # Save the chunk temporarily
        temp_file = os.path.join(output_folder, f"chunk_{i}.wav")
        chunk.export(temp_file, format="wav")

        # Recognize words in the chunk
        with sr.AudioFile(temp_file) as source:
            audio_data = recognizer.record(source)
            try:
                text = recognizer.recognize_google(audio_data)
                words = text.split()

                # Export each word as its own MP3
                word_start = 0
                for j, word in enumerate(words):
                    word_duration = len(chunk) // len(words)  # Approximate duration per word
                    word_audio = chunk[word_start:word_start + word_duration]
                    word_file = os.path.join(output_folder, f"word_{i}_{j}.mp3")
                    word_audio.export(word_file, format="mp3")
                    word_start += word_duration

            except sr.UnknownValueError:
                print(f"Could not understand chunk {i + 1}.")
            except sr.RequestError as e:
                print(f"Could not request results; {e}")

        # Clean up temporary file
        os.remove(temp_file)

    print(f"Processed {len(chunks)} chunks. Word MP3s saved in {output_folder}.")

if __name__ == "__main__":
    input_file = input("Enter the path to the MP3 file: ").strip()
    output_dir = input("Enter the output folder path: ").strip()

    mp3_to_words(input_file, output_dir)


  


  I have added the Base FFMPEG folder and the bin folder within it to Windows PATH
My PATH variable on Windows 11,
But it does not show up in the variable when I typed PATH into cmd

  


• ffmpeg skips frames/packets while playing a file over http

  24 janvier 2020, par coban

  Microsoft Windows [Version 10.0.18362.592]  
  
  libavutil      56. 31.100 / 56. 31.100
  
  libavcodec     58. 54.100 / 58. 54.100
  
  libavformat    58. 29.100 / 58. 29.100
  
  libavdevice    58.  8.100 / 58.  8.100
  
  libavfilter     7. 57.100 /  7. 57.100
  
  libswscale      5.  5.100 /  5.  5.100
  
  libswresample   3.  5.100 /  3.  5.100
  
  libpostproc    55.  5.100 / 55.  5.100
  
  [hls @ 0600cac0] Skip ('#EXT-X-VERSION:3')    0KB sq=    0B f=0/0
  
  [hls @ 0600cac0] Opening 'http://198.144.145.236:1935/ondemand-1/_definst_/mp4:path2/FRENCH.MOVIES/2017.JOHN.WICK.CHAPTER.2.FRN.mp4/chunklist_w1481451763.m3u8' for reading
  
  [hls @ 0600cac0] Skip ('#EXT-X-VERSION:3')    0KB sq=    0B f=0/0
  
  [hls @ 0600cac0] Opening 'http://198.144.145.236:1935/ondemand-1/_definst_/mp4:path2/FRENCH.MOVIES/2017.JOHN.WICK.CHAPTER.2.FRN.mp4/media_w1481451763_0.ts' for reading
  
  [hls @ 0600cac0] Opening 'http://198.144.145.236:1935/ondemand-1/_definst_/mp4:path2/FRENCH.MOVIES/2017.JOHN.WICK.CHAPTER.2.FRN.mp4/media_w1481451763_1.ts' for reading
  
  Input #0, hls, from 'http://ok2.se:8000/movie/xxxxxxxxxx/67933.m3u8':
  
  Duration: 02:02:22.46, start: 0.000000, bitrate: N/A
  
  Program 0
  
  Metadata: 0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0
  
    variant_bitrate : 2788912
  
  Stream #0:0: Data: timed_id3 (ID3  / 0x20334449)
  
  Metadata:
  
    variant_bitrate : 2788912
  
  Stream #0:1: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 720x304 [SAR 1:1 DAR 45:19], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
  
  Metadata:
  
    variant_bitrate : 2788912
  
  Stream #0:2: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp
  
  Metadata:
  
    variant_bitrate : 2788912
  
  [http @ 060662c0] Opening 'http://198.144.145.236:1935/ondemand-1/_definst_/mp4:path2/FRENCH.MOVIES/2017.JOHN.WICK.CHAPTER.2.FRN.mp4/media_w1481451763_2.ts' for reading
  
  [hls @ 0600cac0] Opening 'http://198.144.145.236:1935/ondemand-1/_definst_/mp4:path2/FRENCH.MOVIES/2017.JOHN.WICK.CHAPTER.2.FRN.mp4/media_w1481451763_2.ts' for reading
  
  [http @ 0606fb40] Opening 'http://198.144.145.236:1935/ondemand-1/_definst_/mp4:path2/FRENCH.MOVIES/2017.JOHN.WICK.CHAPTER.2.FRN.mp4/media_w1481451763_3.ts' for reading
  
  [hls @ 0600cac0] Opening 'http://198.144.145.236:1935/ondemand-1/_definst_/mp4:path2/FRENCH.MOVIES/2017.JOHN.WICK.CHAPTER.2.FRN.mp4/media_w1481451763_3.ts' for reading
  
  [http @ 0c2442c0] Opening 'http://198.144.145.236:1935/ondemand-1/_definst_/mp4:path2/FRENCH.MOVIES/2017.JOHN.WICK.CHAPTER.2.FRN.mp4/media_w1481451763_4.ts' for reading
  
  [http @ 0606f8c0] Opening 'http://198.144.145.236:1935/ondemand-1/_definst_/mp4:path2/FRENCH.MOVIES/2017.JOHN.WICK.CHAPTER.2.FRN.mp4/media_w1481451763_5.ts' for reading

  I am trying to create an A/V player using ffmpeg library and Delphi. After puzzling and puzzling I found out how to read/decode/sync/display etc...

  I think this behaviour is in some specific situations, because I tested live streams and noticed no problems. In this case this is a video file, while playing my app and ffplay.exe (from ffmpeg not compiled by myself) behaving the same, and skipping packets "every time when the app has to wait while packetqueue is full ?" and loses about 10-30 seconds of audio and video.

  VLC doesn’t seem to have such a like behaviour, while as I understand from VLC credits, they are using ffmpeg or ffmpeg methods imported for decoding/encoding. inspecting vlc source doesn’t make much sense for me because I am a (noob) Delphi programmer. It’s like my main language is Dutch and try to translate form French to German language.

  Please any suggestions how to avoid this, because I think it has to do something with delivery of data from the server and/or read buffer of ffmpeg. If I increase the max size of packetqueue the skipping does happen later and if decrease the size, the skipping happens sooner.

  Including code from my app is not necessary because ffplay.exe has exact the same behavior. You can see debug from ffplay.exe.