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  • ffmpeg 1FPS extraction call spits out infinite images until disk is bricked on poorly-encoded movie

    12 juillet 2017, par John Allard

    This is one of the oddest things I’ve ever seen while using ffmpeg.

    This is the scenario - we are getting video footage from a IONODE ION-E100 encoder, the footage is encoded in h264. I can view the footage fine in VLC, and I can copy it over to another video using ffmpeg and -c:v copy. The issue arises when I try and extract one FPS from the movie using the following command :

    ffmpeg -i testmovie.mp4 -r 1 -vf 640:-2 -q:v 18 -loglevel error /tmp/tmp/extraction_%04d.jpeg

    What this should do is go through the movie and extract one frame per second, then dump the frames to the files /tmp/tmp/extraction_0001.jpeg, /tmp/tmp/extraction_0002.jpeg, ..., /tmp/tmp/extraction_000X.jpeg. It should end when it reaches the end of the video.

    Now the odd thing that happens when I run this command is that it will run in a tight loop, writing tens or hundreds of thousands of images to the disk until the disk is full at which point the command fails. All of the extracted images are the exact same as one another.

    Here is the ffmpeg stats output on the video

    ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
    
  libavutil      55. 34.100 / 55. 34.100
    
  libavcodec     57. 64.101 / 57. 64.101
    
  libavformat    57. 56.100 / 57. 56.100
    
  libavdevice    57.  1.100 / 57.  1.100
    
  libavfilter     6. 65.100 /  6. 65.100
    
  libavresample   3.  1.  0 /  3.  1.  0
    
  libswscale      4.  2.100 /  4.  2.100
    
  libswresample   2.  3.100 /  2.  3.100
    
  libpostproc    54.  1.100 / 54.  1.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/john/ionode/test2.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    title           : /videoinput_1:0/h264_1/media.stm
    
    encoder         : Lavf57.56.100
    
  Duration: 00:00:16.52, start: -9791.427750, bitrate: 2165 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 2119 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 236 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler

    (notice the start: -9791.427750 value, what is this ?)

    Here are the encoding details on the footage :

    {
    
    "programs": [
    

    
    ],
    
    "streams": [
    
        {
    
            "index": 0,
    
            "codec_name": "h264",
    
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
    
            "profile": "High",
    
            "codec_type": "video",
    
            "codec_time_base": "1/50",
    
            "codec_tag_string": "avc1",
    
            "codec_tag": "0x31637661",
    
            "width": 1920,
    
            "height": 1080,
    
            "coded_width": 1920,
    
            "coded_height": 1080,
    
            "has_b_frames": 2,
    
            "sample_aspect_ratio": "1:1",
    
            "display_aspect_ratio": "16:9",
    
            "pix_fmt": "yuv420p",
    
            "level": 40,
    
            "chroma_location": "left",
    
            "refs": 1,
    
            "is_avc": "true",
    
            "nal_length_size": "4",
    
            "r_frame_rate": "25/1",
    
            "avg_frame_rate": "25/1",
    
            "time_base": "1/12800",
    
            "start_pts": 0,
    
            "start_time": "0.000000",
    
            "duration_ts": 211456,
    
            "duration": "16.520000",
    
            "bit_rate": "2119813",
    
            "bits_per_raw_sample": "8",
    
            "nb_frames": "413",
    
            "disposition": {
    
                "default": 1,
    
                "dub": 0,
    
                "original": 0,
    
                "comment": 0,
    
                "lyrics": 0,
    
                "karaoke": 0,
    
                "forced": 0,
    
                "hearing_impaired": 0,
    
                "visual_impaired": 0,
    
                "clean_effects": 0,
    
                "attached_pic": 0,
    
                "timed_thumbnails": 0
    
            },
    
            "tags": {
    
                "language": "und",
    
                "handler_name": "VideoHandler"
    
            }
    
        }
    
    ]
    
}

    Here a link to the sample video to use : http://s000.tinyupload.com/?file_id=03169189167771012515
    (it’s a 5MB video file)

    The only clues I have as to what is actually going on is the error output
    from the command that grabs the video from the encoder :

    [mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823640, current: -630275919; changing to -629823639. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823639, current: -630274895; changing to -629823638. This may result in incorrect timestamps in the output file.
    
frame=  124 fps= 21 q=28.0 size=      41kB time=00:00:02.60 bitrate= 128.8kbits/s dup=26 drop=4 spee[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823638, current: -630273871; changing to -629823637. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823637, current: -630272847; changing to -629823636. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823636, current: -630271824; changing to -629823635. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823635, current: -630270800; changing to -629823634. This may result in incorrect timestamps in the output file.
    
frame=  124 fps= 19 q=28.0 size=      43kB time=00:00:02.60 bitrate= 137.0kbits/s dup=26 drop=4 spee[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823634, current: -630269776; changing to -629823633. This may result in incorrect timestamps in the output file.
    
[aac @ 0x7faa1a832000] Queue input is backward in time
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823633, current: -630268752; changing to -629823632. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823632, current: -630267728; changing to -629823631. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823631, current: -630513833; changing to -629823630. This may result in incorrect timestamps in the output file.
    
frame=  124 fps= 18 q=28.0 size=      46kB time=00:00:02.60 bitrate= 145.4kbits/s dup=26 drop=4 spee[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823630, current: -630512810; changing to -629823629. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823629, current: -630511786; changing to -629823628. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823628, current: -630510762; changing to -629823627. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823627, current: -630509738; changing to -629823626. This may result in incorrect timestamps in the output file.
    
frame=  124 fps= 17 q=28.0 size=      49kB time=00:00:02.60 bitrate= 153.6kbits/s dup=26 drop=4 spee[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823626, current: -630508714; changing to -629823625. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823625, current: -630507690; changing to -629823624. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823624, current: -630506667; changing to -629823623. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823623, current: -630505643; changing to -629823622. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823622, current: -630504619; changing to -629823621. This may result in incorrect timestamps in the output file.
    
frame=  124 fps= 16 q=28.0 size=      52kB time=00:00:02.60 bitrate= 163.5kbits/s dup=26 drop=4 spee[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823621, current: -630503595; changing to -629823620. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823620, current: -630502571; changing to -629823619. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823619, current: -630501548; changing to -629823618. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823618, current: -630500524; changing to -629823617. This may result in incorrect timestamps in the output file.
    
frame=  124 fps= 15 q=28.0 size=      54kB time=00:00:02.60 bitrate= 171.4kbits/s dup=26 drop=4 spee[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823617, current: -630499500; changing to -629823616. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823616, current: -630498476; changing to -629823615. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823615, current: -630497452; changing to -629823614. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823614, current: -630496428; changing to -629823613. This may result in incorrect timestamps in the output file.
    
frame=  124 fps= 14 q=28.0 size=      57kB time=00:00:02.60 bitrate= 179.3kbits/s dup=26 drop=4 spee[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823613, current: -630495405; changing to -629823612. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823612, current: -630494381; changing to -629823611. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823611, current: -630493357; changing to -629823610. This may result in incorrect timestamps in the output file.
    
frame=  124 fps= 13 q=28.0 size=      59kB time=00:00:02.60 bitrate= 185.6kbits/s dup=26 drop=4 spee[aac @ 0x7faa1a832000] Queue input is backward in time
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823610, current: -630492333; changing to -629823609. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823609, current: -630491309; changing to -629823608. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823608, current: -630736398; changing to -629823607. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823607, current: -630735375; changing to -629823606. This may result in incorrect timestamps in the output file.
    
frame=  124 fps= 12 q=28.0 size=      61kB time=00:00:02.60 bitrate= 193.5kbits/s dup=26 drop=4 spee[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823606, current: -630734351; changing to -629823605. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823605, current: -630733327; changing to -629823604. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823604, current: -630732303; changing to -629823603. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823603, current: -630731279; changing to -629823602. This may result in incorrect timestamps in the output file.
    
[mp4 @ 0x7faa1a83ba00] Non-monotonous DTS in output stream 0:1; previous: -629823602, current: -630730256; changing to -629823601. This may result in incorrect timestamps in the output file.
    
frame=  124 fps= 12 q=-1.0 Lsize=     507kB time=00:00:04.84 bitrate= 858.7kbits/s dup=26 drop=4 speed=0.453x

    So my question is, why does this video break ffmpeg ? Why does ffmpeg get caught up in a tight loop extracting images without ever making any progres towards the end of the video ?

  • FFMPEG-PHP Windows "Can't open movie file"

    23 janvier 2014, par bah

    ffmpeg extension is loaded as it is shown at phpinfo(), my file and script are at the same location, but I'm still getting this error.

    Warning: Can't open movie file Untitled.avi in C:\xampp\htdocs\skelbiu\fetch.php  on line 4
    

    
Fatal error: Call to a member function getDuration() on a non-object in C:\xampp\htdocs\skelbiu\fetch.php on line 5

    My script :

    extension_loaded('ffmpeg') or die('Error in loading ffmpeg');
    

    
$ffmpegInstance = new ffmpeg_movie('Untitled.avi');
    
echo "getDuration: " . $ffmpegInstance->getDuration() .
    
"getFrameCount: " . $ffmpegInstance->getFrameCount() .
    
"getFrameRate: " . $ffmpegInstance->getFrameRate() .
    
"getFilename: " . $ffmpegInstance->getFilename() .
    
"getComment: " . $ffmpegInstance->getComment() .
    
"getTitle: " . $ffmpegInstance->getTitle() .
    
"getAuthor: " . $ffmpegInstance->getAuthor() .
    
"getCopyright: " . $ffmpegInstance->getCopyright() .
    
"getArtist: " . $ffmpegInstance->getArtist() .
    
"getGenre: " . $ffmpegInstance->getGenre() .
    
"getTrackNumber: " . $ffmpegInstance->getTrackNumber() .
    
"getYear: " . $ffmpegInstance->getYear() .
    
"getFrameHeight: " . $ffmpegInstance->getFrameHeight() .
    
"getFrameWidth: " . $ffmpegInstance->getFrameWidth() .
    
"getPixelFormat: " . $ffmpegInstance->getPixelFormat() .
    
"getBitRate: " . $ffmpegInstance->getBitRate() .
    
"getVideoBitRate: " . $ffmpegInstance->getVideoBitRate() .
    
"getAudioBitRate: " . $ffmpegInstance->getAudioBitRate() .
    
"getAudioSampleRate: " . $ffmpegInstance->getAudioSampleRate() .
    
"getVideoCodec: " . $ffmpegInstance->getVideoCodec() .
    
"getAudioCodec: " . $ffmpegInstance->getAudioCodec() .
    
"getAudioChannels: " . $ffmpegInstance->getAudioChannels() .
    
"hasAudio: " . $ffmpegInstance->hasAudio();

    I'm using php 5.2.9 (XAMPP 1.7.1), Windows 7.
    Thanks in advance !

  • Streaming converted movie with mp4 container in NodeJS, movie playing very fast

    20 septembre 2016, par Mustafa

    I have used stream-transcoder module to convert a file make it a stream. So the file is not stored, it is on the fly.

    app.get("/video", function(req,res){
    
    res.writeHead(200, {'Content-Type': 'video/mp4'});
    
    var src = "movie.avi";
    

    
    var Transcoder = require('stream-transcoder');
    
    var stream = fs.createReadStream(src);
    
    new Transcoder(stream)
    
        .maxSize(1280, 720)
    
        .videoCodec('h264')
    
        .videoBitrate(800 * 1000)
    
        .fps(25)
    
        .sampleRate(44100)
    
        .channels(2)
    
        .audioBitrate(128 * 1000)
    
        .format('mp4')
    
        .on('finish', function() {
    
            console.log("finished");
    
        })
    
        .stream().pipe(res);
    
});

    It works nicely, it is fast, but too fast, the audio is played at the same speed, however the video does not respect the frame rate, whatever is recieved from ffmpeg is immeidately shown, fastly. Additionally, it does not show the total time, I believe it is the problem. I need to somehow specify the length, framerate, but I could not find enough information on that. I thought the stream recieved from ffmpeg should contain that. And I could not find respective headers for that in HTTP.

    Here are the flags that this stream-transcoder module uses for MP4 :

    [ '-i',
    
  '-',
    
  '-vf',
    
  'scale=min(trunc(1280/hsub)*hsub\\,trunc(a*720/hsub)*hsub):min(trunc(720/vsub)*vsub\\,trunc(1280/a/vsub)*vsub)',
    
  '-vcodec',
    
  'h264',
    
  '-b:v',
    
  800000,
    
  '-r',
    
  25,
    
  '-ar',
    
  44100,
    
  '-ac',
    
  2,
    
  '-ab',
    
  128000,
    
  '-f',
    
  'mp4',
    
  '-movflags',
    
  'frag_keyframe+faststart',
    
  'pipe:1' ]

    When I use VP8 encoder and WebM, it works nicely, the time is displayed, video plays normal speed.

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