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  • Emballe médias : à quoi cela sert ?

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Sur d’autres sites (7220)

  • Decompressing time-To-Sample table (STTS) in an MP4 file

    30 mai 2016, par man-r

    i have an mp4 video byte array and i need to generate a thumbnail for it using its middle frame (e.g. if the video length is 10 seconds then i need to get the picture from 5th second).

    i managed to parse through the file and extract its boxes (atom). i have also managed to get the video length from the mvhd box. also i managed to extract
    1. the time-To-Sample table from stts box,
    2. the sample-To-Chunk table from stcs box,
    3. the chunk-Offset table from stco box,
    4. the sample Size table from stsz box,
    5. the Sync Sample table from stss box

    i know that all the actual media are available in the mdat box and that i need to correlate the above table to find the exact frame offset in the file but my question is how ? the tables data seems to be compressed (specially the time-To-Sample table) but i don’t know how decompress them.

    any help is appreciated.

    below are code samples

    code to convert byte to hex

    public static char[] bytesToHex(byte[] bytes) {
    
    char[] hexChars = new char[bytes.length * 2];
    
    for ( int j = 0; j < bytes.length; j++ ) {
    
        int v = bytes[j] & 0xFF;
    

    
        hexChars[j * 2] = hexArray[v >>> 4];
    
        hexChars[j * 2 + 1] = hexArray[v & 0x0F];            
    
    }
    
    return hexChars;
    
}

    code for getting the box offset

    final static String MOOV                          = "6D6F6F76";
    
final static String MOOV_MVHD                     = "6D766864";
    
final static String MOOV_TRAK                     = "7472616B";
    
final static String MOOV_TRAK_MDIA                = "6D646961";
    
final static String MOOV_TRAK_MDIA_MINF           = "6D696E66";
    
final static String MOOV_TRAK_MDIA_MINF_STBL      = "7374626C";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STSD = "73747364";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STTS = "73747473";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STSS = "73747373";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STSC = "73747363";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STCO = "7374636F";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STSZ = "7374737A";
    

    
static int getBox(char[] s, int offset, String type) {
    
    int typeOffset = -1;
    
    for (int i = offset*2; i-1) {
    
                break;
    
            } 
    
        }
    
        i+=(size*2);
    
    }
    

    
    return typeOffset;
    
}

    code for getting the duration and timescale

    static int[] getDuration(char[] s) {
    
    int mvhdOffset = getBox(s, 0, MOOV_MVHD);
    
    int timeScaleStart = (mvhdOffset*2) + (4 + 4 + 1 + 3 + 4 + 4)*2;
    
    int timeScaleEnd   = (mvhdOffset*2) + (4 + 4 + 1 + 3 + 4 + 4 + 4)*2;
    

    
    int durationStart  = (mvhdOffset*2) + (4 + 4 + 1 + 3 + 4 + 4 + 4)*2;
    
    int durationEnd    = (mvhdOffset*2) + (4 + 4 + 1 + 3 + 4 + 4 + 4 + 4)*2;
    

    
    String timeScaleHex = new String(Arrays.copyOfRange(s, timeScaleStart, timeScaleEnd));
    
    String durationHex = new String(Arrays.copyOfRange(s, durationStart, durationEnd));
    

    
    int timeScale = Integer.parseInt(timeScaleHex, 16);
    
    int duration = Integer.parseInt(durationHex, 16);
    

    
    int[] result = {duration, timeScale};
    
    return result;
    
}

    code to get the time-To-Sample table

    static int[][] getTimeToSampleTable(char[] s, int trakOffset) {
    
    int offset = getBox(s, trakOffset, MOOV_TRAK_MDIA_MINF_STBL_STTS);
    
    int sizeStart = offset*2;
    
    int sizeEnd   = offset*2 + (4)*2;
    

    
    int typeStart = offset*2 + (4)*2;
    
    int typeEnd   = offset*2 + (4 + 4)*2;
    

    
    int noOfEntriesStart = offset*2 + (4 + 4 + 1 + 3)*2;
    
    int noOfEntriesEnd   = offset*2 + (4 + 4 + 1 + 3 + 4)*2;
    

    
    String sizeHex = new String(Arrays.copyOfRange(s, sizeStart, sizeEnd));
    
    String typeHex = new String(Arrays.copyOfRange(s, typeStart, typeEnd));
    
    String noOfEntriesHex = new String(Arrays.copyOfRange(s, noOfEntriesStart, noOfEntriesEnd));
    

    
    int size = Integer.parseInt(sizeHex, 16);
    
    int noOfEntries = Integer.parseInt(noOfEntriesHex, 16);
    

    
    int[][] timeToSampleTable = new int[noOfEntries][2];
    

    
    for (int i = 0; icode>

  • MP4 file data structure

    16 décembre 2015, par man-r

    i have an mp4 video byte array and i need to generate a thumbnail for it using its middle frame (e.g. if the video length is 10 seconds then i need to get the picture from 5th second).

    i managed to parse through the file and extract its boxes (atom). i have also managed to get the video length from the mvhd box. also i managed to extract
    1. the time-To-Sample table from stts box,
    2. the sample-To-Chunk table from stcs box,
    3. the chunk-Offset table from stco box,
    4. the sample Size table from stsz box,
    5. the Sync Sample table from stss box

    i know that all the actual media are available in the mdat box and that i need to correlate the above table to find the exact frame offset in the file but my question is how ? the tables data seems to be compressed (specially the time-To-Sample table) but i don’t know how decompress them.

    any help is appreciated.

    below are code samples

    code to convert byte to hex

    public static char[] bytesToHex(byte[] bytes) {
    
    char[] hexChars = new char[bytes.length * 2];
    
    for ( int j = 0; j < bytes.length; j++ ) {
    
        int v = bytes[j] & 0xFF;
    

    
        hexChars[j * 2] = hexArray[v >>> 4];
    
        hexChars[j * 2 + 1] = hexArray[v & 0x0F];            
    
    }
    
    return hexChars;
    
}

    code for getting the box offset

    final static String MOOV                          = "6D6F6F76";
    
final static String MOOV_MVHD                     = "6D766864";
    
final static String MOOV_TRAK                     = "7472616B";
    
final static String MOOV_TRAK_MDIA                = "6D646961";
    
final static String MOOV_TRAK_MDIA_MINF           = "6D696E66";
    
final static String MOOV_TRAK_MDIA_MINF_STBL      = "7374626C";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STSD = "73747364";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STTS = "73747473";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STSS = "73747373";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STSC = "73747363";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STCO = "7374636F";
    
final static String MOOV_TRAK_MDIA_MINF_STBL_STSZ = "7374737A";
    

    
static int getBox(char[] s, int offset, String type) {
    
    int typeOffset = -1;
    
    for (int i = offset*2; i-1) {
    
                break;
    
            } 
    
        }
    
        i+=(size*2);
    
    }
    

    
    return typeOffset;
    
}

    code for getting the duration and timescale

    static int[] getDuration(char[] s) {
    
    int mvhdOffset = getBox(s, 0, MOOV_MVHD);
    
    int timeScaleStart = (mvhdOffset*2) + (4 + 4 + 1 + 3 + 4 + 4)*2;
    
    int timeScaleEnd   = (mvhdOffset*2) + (4 + 4 + 1 + 3 + 4 + 4 + 4)*2;
    

    
    int durationStart  = (mvhdOffset*2) + (4 + 4 + 1 + 3 + 4 + 4 + 4)*2;
    
    int durationEnd    = (mvhdOffset*2) + (4 + 4 + 1 + 3 + 4 + 4 + 4 + 4)*2;
    

    
    String timeScaleHex = new String(Arrays.copyOfRange(s, timeScaleStart, timeScaleEnd));
    
    String durationHex = new String(Arrays.copyOfRange(s, durationStart, durationEnd));
    

    
    int timeScale = Integer.parseInt(timeScaleHex, 16);
    
    int duration = Integer.parseInt(durationHex, 16);
    

    
    int[] result = {duration, timeScale};
    
    return result;
    
}

    code to get the time-To-Sample table

    static int[][] getTimeToSampleTable(char[] s, int trakOffset) {
    
    int offset = getBox(s, trakOffset, MOOV_TRAK_MDIA_MINF_STBL_STTS);
    
    int sizeStart = offset*2;
    
    int sizeEnd   = offset*2 + (4)*2;
    

    
    int typeStart = offset*2 + (4)*2;
    
    int typeEnd   = offset*2 + (4 + 4)*2;
    

    
    int noOfEntriesStart = offset*2 + (4 + 4 + 1 + 3)*2;
    
    int noOfEntriesEnd   = offset*2 + (4 + 4 + 1 + 3 + 4)*2;
    

    
    String sizeHex = new String(Arrays.copyOfRange(s, sizeStart, sizeEnd));
    
    String typeHex = new String(Arrays.copyOfRange(s, typeStart, typeEnd));
    
    String noOfEntriesHex = new String(Arrays.copyOfRange(s, noOfEntriesStart, noOfEntriesEnd));
    

    
    int size = Integer.parseInt(sizeHex, 16);
    
    int noOfEntries = Integer.parseInt(noOfEntriesHex, 16);
    

    
    int[][] timeToSampleTable = new int[noOfEntries][2];
    

    
    for (int i = 0; icode>

  • FFmpegKit in Flutter fails with configuration output on Android

    15 décembre 2024, par ashvin jadav

    I am using ffmpeg_kit_flutter in my Flutter app to add a text overlay to a video. However, when I try to execute the FFmpeg command, I get an output similar to this :

    


    configuration : --cross-prefix=aarch64-linux-android- --sysroot=/Users/sue/Library/Android/sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/darwin-x86_64/sysroot --prefix=/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/opt/homebrew/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable...

    


    Here is my code :

    


    final command = '-i $_videoPath -vf "drawtext=text=\'Live Score: 10 - 5\':fontcolor=white:fontsize=24:x=10:y=10" $_processedVideoPath';

await FFmpegKit.execute(command).then((session) async {
  final returnCode = await session.getReturnCode();
  final output = await session.getOutput();
  final errorOutput = await session.getFailStackTrace();

  print('Return Code: $returnCode');
  print('Output: $output');
  print('Error Output: $errorOutput');
});


    


    Dependencies :
ffmpeg_kit_flutter: ^6.0.3

    


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