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Sur d’autres sites (10809)

  • 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.

  • 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.

  • avformat/riff : map Y416 fourcc to RAWVIDEO decoder

    23 octobre 2024, par James Almer
    avformat/riff : map Y416 fourcc to RAWVIDEO decoder

    As defined in https://learn.microsoft.com/en-us/windows/win32/medfound/10-bit-and-16-bit-yuv-video-formats#422-formats
    

    Signed-off-by : James Almer <jamrial@gmail.com>
    • [DH] libavcodec/raw.c
    • [DH] libavformat/riff.c
    • [DH] tests/ref/fate/filter-pixdesc-xv48le
    • [DH] tests/ref/fate/filter-pixfmts-copy
    • [DH] tests/ref/fate/filter-pixfmts-crop
    • [DH] tests/ref/fate/filter-pixfmts-field
    • [DH] tests/ref/fate/filter-pixfmts-fieldorder
    • [DH] tests/ref/fate/filter-pixfmts-hflip
    • [DH] tests/ref/fate/filter-pixfmts-il
    • [DH] tests/ref/fate/filter-pixfmts-null
    • [DH] tests/ref/fate/filter-pixfmts-scale
    • [DH] tests/ref/fate/filter-pixfmts-transpose
    • [DH] tests/ref/fate/filter-pixfmts-vflip

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