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  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

  • Gestion générale des documents

    13 mai 2011, par

    MédiaSPIP ne modifie jamais le document original mis en ligne.
    Pour chaque document mis en ligne il effectue deux opérations successives : la création d’une version supplémentaire qui peut être facilement consultée en ligne tout en laissant l’original téléchargeable dans le cas où le document original ne peut être lu dans un navigateur Internet ; la récupération des métadonnées du document original pour illustrer textuellement le fichier ;
    Les tableaux ci-dessous expliquent ce que peut faire MédiaSPIP (...)

Sur d’autres sites (4942)

  • FFMPEG Segmenting skips when m3u8 changes file

    25 septembre 2012, par user792164

    I am attempting to segment a large video file in to segments. When streamed (even locally) by opening the m3u8 file it will jump forward in time by some period of time less than 1 second.

    The following commands are executed :

    First mp4 —> ts :

    ffmpeg -i input_file.mp4 -bsf:v h264_mp4toannexb -acodec libfaac -vcodec libx264 -f mpegts -threads 0 output.ts

    Then I split using :

    ffmpeg -i output.ts -vcodec copy -acodec copy -map 0 -f segment -segment_time 30 -segment_list output.m3u8 -segment_list_type m3u8 -segment_format mpegts output%03d.ts

    Note : Changing segment time has no effect on issue.

    Generated manifest :

    #EXTM3U
    
#EXT-X-VERSION:4
    
#EXTINF:30.947578,
    
output000.ts
    
#EXTINF:30.155111,
    
output001.ts
    
...
    
#EXTINF:24.023989,
    
output082.ts
    
#EXT-X-TARGETDURATION:37
    
#EXT-X-ENDLIST

    Meta Data :

    $> ffmpeg -version
    
ffmpeg version git-2012-08-19-a93c221
    
built on Aug 19 2012 13:18:58 with gcc 4.4.5 (Debian 4.4.5-8)
    
configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib/ --mandir=/usr/share/man --extra-cflags='-O3 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions \ -fstack-protector --param=ssp-buffer-size=4 -mtune=generic' --enable-gpl --enable-shared --enable-nonfree --enable-version3 --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-pthreads --enable-libxvid --enable-postproc --enable-libgsm --enable-libspeex --enable-avfilter --disable-decoder=libdirac --enable-libfreetype --enable-libschroedinger --disable-decoder=libschroedinger --enable-libopenjpeg --disable-ffplay --disable-ffserver
    
libavutil      51. 70.100 / 51. 70.100
    
libavcodec     54. 53.100 / 54. 53.100
    
libavformat    54. 25.104 / 54. 25.104
    
libavdevice    54.  2.100 / 54.  2.100
    
libavfilter     3. 11.101 /  3. 11.101
    
libswscale      2.  1.101 /  2.  1.101
    
libswresample   0. 15.100 /  0. 15.100
    
libpostproc    52.  0.100 / 52.  0.100

    -

    $> ffprobe input_file.mp4
    

    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_file.mp4':
    
Metadata:
    
major_brand     : isom
    
minor_version   : 1
    
compatible_brands: isom
    
creation_time   : 2011-09-08 11:43:25
    
Duration: 00:41:31.00, start: 0.000000, bitrate: 1146 kb/s
    
Stream #0.0(und): Video: h264 (High), yuv420p, 720x404 [PAR 1:1 DAR 180:101], 1015 kb/s,    23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc
    
Metadata:
    
  creation_time   : 2011-09-08 11:43:25
    
Stream #0.1(und): Audio: aac, 48000 Hz, stereo, s16, 124 kb/s
    
Metadata:
    
  creation_time   : 2011-09-08 11:43:25

    -

    $> ffprobe output_file.ts
    
Input #0, mpegts, from 'output_file.ts':
    
Duration: 00:41:30.98, start: 1.400000, bitrate: 807 kb/s
    
Program 1 
    
Metadata:
    
  service_name    : Service01
    
  service_provider: FFmpeg
    
Stream #0.0[0x100]: Video: h264 (High), yuv420p, 720x404 [PAR 1:1 DAR 180:101], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
    
Stream #0.1[0x101](und): Audio: aac, 48000 Hz, stereo, s16, 141 kb/

    Is it possible to remove this jump, if so, what encoding parameters or incorrect assumptions have I made ? Thanks.

  • Trouble syncing libavformat/ffmpeg with x264 and RTP

    26 décembre 2012, par Jacob Peddicord

    I've been working on some streaming software that takes live feeds
    from various kinds of cameras and streams over the network using
    H.264. To accomplish this, I'm using the x264 encoder directly (with
    the "zerolatency" preset) and feeding NALs as they are available to
    libavformat to pack into RTP (ultimately RTSP). Ideally, this
    application should be as real-time as possible. For the most part,
    this has been working well.

    Unfortunately, however, there is some sort of synchronization issue :
    any video playback on clients seems to show a few smooth frames,
    followed by a short pause, then more frames ; repeat. Additionally,
    there appears to be approximately a 4-second delay. This happens with
    every video player I've tried : Totem, VLC, and basic gstreamer pipes.

    I've boiled it all down to a somewhat small test case :

    #include 
    
#include 
    
#include 
    
#include 
    
#include <libavformat></libavformat>avformat.h>
    
#include <libswscale></libswscale>swscale.h>
    

    
#define WIDTH       640
    
#define HEIGHT      480
    
#define FPS         30
    
#define BITRATE     400000
    
#define RTP_ADDRESS "127.0.0.1"
    
#define RTP_PORT    49990
    

    
struct AVFormatContext* avctx;
    
struct x264_t* encoder;
    
struct SwsContext* imgctx;
    

    
uint8_t test = 0x80;
    

    

    
void create_sample_picture(x264_picture_t* picture)
    
{
    
    // create a frame to store in
    
    x264_picture_alloc(picture, X264_CSP_I420, WIDTH, HEIGHT);
    

    
    // fake image generation
    
    // disregard how wrong this is; just writing a quick test
    
    int strides = WIDTH / 8;
    
    uint8_t* data = malloc(WIDTH * HEIGHT * 3);
    
    memset(data, test, WIDTH * HEIGHT * 3);
    
    test = (test &lt;&lt; 1) | (test >> (8 - 1));
    

    
    // scale the image
    
    sws_scale(imgctx, (const uint8_t* const*) &amp;data, &amp;strides, 0, HEIGHT,
    
              picture->img.plane, picture->img.i_stride);
    
}
    

    
int encode_frame(x264_picture_t* picture, x264_nal_t** nals)
    
{
    
    // encode a frame
    
    x264_picture_t pic_out;
    
    int num_nals;
    
    int frame_size = x264_encoder_encode(encoder, nals, &amp;num_nals, picture, &amp;pic_out);
    

    
    // ignore bad frames
    
    if (frame_size &lt; 0)
    
    {
    
        return frame_size;
    
    }
    

    
    return num_nals;
    
}
    

    
void stream_frame(uint8_t* payload, int size)
    
{
    
    // initalize a packet
    
    AVPacket p;
    
    av_init_packet(&amp;p);
    
    p.data = payload;
    
    p.size = size;
    
    p.stream_index = 0;
    
    p.flags = AV_PKT_FLAG_KEY;
    
    p.pts = AV_NOPTS_VALUE;
    
    p.dts = AV_NOPTS_VALUE;
    

    
    // send it out
    
    av_interleaved_write_frame(avctx, &amp;p);
    
}
    

    
int main(int argc, char* argv[])
    
{
    
    // initalize ffmpeg
    
    av_register_all();
    

    
    // set up image scaler
    
    // (in-width, in-height, in-format, out-width, out-height, out-format, scaling-method, 0, 0, 0)
    
    imgctx = sws_getContext(WIDTH, HEIGHT, PIX_FMT_MONOWHITE,
    
                            WIDTH, HEIGHT, PIX_FMT_YUV420P,
    
                            SWS_FAST_BILINEAR, NULL, NULL, NULL);
    

    
    // set up encoder presets
    
    x264_param_t param;
    
    x264_param_default_preset(&amp;param, "ultrafast", "zerolatency");
    

    
    param.i_threads = 3;
    
    param.i_width = WIDTH;
    
    param.i_height = HEIGHT;
    
    param.i_fps_num = FPS;
    
    param.i_fps_den = 1;
    
    param.i_keyint_max = FPS;
    
    param.b_intra_refresh = 0;
    
    param.rc.i_bitrate = BITRATE;
    
    param.b_repeat_headers = 1; // whether to repeat headers or write just once
    
    param.b_annexb = 1;         // place start codes (1) or sizes (0)
    

    
    // initalize
    
    x264_param_apply_profile(&amp;param, "high");
    
    encoder = x264_encoder_open(&amp;param);
    

    
    // at this point, x264_encoder_headers can be used, but it has had no effect
    

    
    // set up streaming context. a lot of error handling has been ommitted
    
    // for brevity, but this should be pretty standard.
    
    avctx = avformat_alloc_context();
    
    struct AVOutputFormat* fmt = av_guess_format("rtp", NULL, NULL);
    
    avctx->oformat = fmt;
    

    
    snprintf(avctx->filename, sizeof(avctx->filename), "rtp://%s:%d", RTP_ADDRESS, RTP_PORT);
    
    if (url_fopen(&amp;avctx->pb, avctx->filename, URL_WRONLY) &lt; 0)
    
    {
    
        perror("url_fopen failed");
    
        return 1;
    
    }
    
    struct AVStream* stream = av_new_stream(avctx, 1);
    

    
    // initalize codec
    
    AVCodecContext* c = stream->codec;
    
    c->codec_id = CODEC_ID_H264;
    
    c->codec_type = AVMEDIA_TYPE_VIDEO;
    
    c->flags = CODEC_FLAG_GLOBAL_HEADER;
    
    c->width = WIDTH;
    
    c->height = HEIGHT;
    
    c->time_base.den = FPS;
    
    c->time_base.num = 1;
    
    c->gop_size = FPS;
    
    c->bit_rate = BITRATE;
    
    avctx->flags = AVFMT_FLAG_RTP_HINT;
    

    
    // write the header
    
    av_write_header(avctx);
    

    
    // make some frames
    
    for (int frame = 0; frame &lt; 10000; frame++)
    
    {
    
        // create a sample moving frame
    
        x264_picture_t* pic = (x264_picture_t*) malloc(sizeof(x264_picture_t));
    
        create_sample_picture(pic);
    

    
        // encode the frame
    
        x264_nal_t* nals;
    
        int num_nals = encode_frame(pic, &amp;nals);
    

    
        if (num_nals &lt; 0)
    
            printf("invalid frame size: %d\n", num_nals);
    

    
        // send out NALs
    
        for (int i = 0; i &lt; num_nals; i++)
    
        {
    
            stream_frame(nals[i].p_payload, nals[i].i_payload);
    
        }
    

    
        // free up resources
    
        x264_picture_clean(pic);
    
        free(pic);
    

    
        // stream at approx 30 fps
    
        printf("frame %d\n", frame);
    
        usleep(33333);
    
    }
    

    
    return 0;
    
}

    This test shows black lines on a white background that
    should move smoothly to the left. It has been written for ffmpeg 0.6.5
    but the problem can be reproduced on 0.8 and 0.10 (from what I've tested so far). I've taken some shortcuts in error handling to make this example as short as
    possible while still showing the problem, so please excuse some of the
    nasty code. I should also note that while an SDP is not used here, I
    have tried using that already with similar results. The test can be
    compiled with :

    gcc -g -std=gnu99 streamtest.c -lswscale -lavformat -lx264 -lm -lpthread -o streamtest

    It can be played with gtreamer directly :

    gst-launch udpsrc port=49990 ! application/x-rtp,payload=96,clock-rate=90000 ! rtph264depay ! decodebin ! xvimagesink

    You should immediately notice the stuttering. One common "fix" I've
    seen all over the Internet is to add sync=false to the pipeline :

    gst-launch udpsrc port=49990 ! application/x-rtp,payload=96,clock-rate=90000 ! rtph264depay ! decodebin ! xvimagesink sync=false

    This causes playback to be smooth (and near-realtime), but is a
    non-solution and only works with gstreamer. I'd like to fix the
    problem at the source. I've been able to stream with near-identical
    parameters using raw ffmpeg and haven't had any issues :

    ffmpeg -re -i sample.mp4 -vcodec libx264 -vpre ultrafast -vpre baseline -b 400000 -an -f rtp rtp://127.0.0.1:49990 -an

    So clearly I'm doing something wrong. But what is it ?

  • Converting DVD image with subtitles to MKV using avconv

    16 janvier 2016, par Carlos Eugenio Thompson Pinzón

    This is the procedure I know to convert a DVD image to another videoformat (v.g. MP4) :

    1. concatenate the VTS_01_n.VOB files inside VIDEO_TS folder (for n >= 0) into a single VOB file.
    2. use avconv or ffmpeg in order to convert that VOB into another format.

    So far so good, however now I want to convert the DVD image with the subtitles. As far as I know the MKV format supports subtitles, so it seems an obvious choice. Alternatively I might use any other format with hard subtitles (subtitles as part of the video image).

    However, the subtitle encoding in the DVD image is dvdsub and I get the following error

    Only SUBTITLE_ASS type supported.
    
Subtitle encoding failed

    However, when running avconv -codecs I get :

    ...
    
 DES    dvdsub          DVD subtitles
    
...

    And the -c:s copy switch, while it prevents the command to fail, it does not seem to produce a subtitle that the player can understand.

    So, how can I create ass subtitles from dvdsub using avconv ?

    My VOB file has eight subtitle channels and two audio channels. The Ubuntu video app does not show any subtitles, and only the first audio channel seems to be working, do the DVD image might be broken.

    Another file, for a double-layer DVD, displays the Subtitle encoding error, however when using the -c:s copy switch it further displays :

    Application provided invalid, non monotonically increasing dts to muxer in stream 2: 49 >= 49
    
av_interleaved_write_frame(): Invalid argument

    Thank you in advance for any ideas on how to solve these problems.

    (I am using Ubuntu where ffmpeg is an alias for avconv. I know it is possible to install the real ffmpeg but so far I have not done so.)

    update : commands and console outputs :

    commands

    cat VTS_01_1.VOB VTS_01_2.VOB VTS_01_3.VOB VTS_01_4.VOB VTS_01_5.VOB > ~/temp/mymovie.VOB
    
cd ~/temp
    
avconv -i mymovie.VOB

    output

    avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
    
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
    
[mpeg @ 0x1a64d40] max_analyze_duration reached
    
Input #0, mpeg, from 'mymovie.VOB':
    
  Duration: 00:00:01.95, start: 0.280633, bitrate: -2147483 kb/s
    
    Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [PAR 8:9 DAR 4:3], 7500 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    
    Stream #0.1[0x20]: Subtitle: dvdsub
    
    Stream #0.2[0x21]: Subtitle: dvdsub
    
    Stream #0.3[0x22]: Subtitle: dvdsub
    
    Stream #0.4[0x23]: Subtitle: dvdsub
    
    Stream #0.5[0x24]: Subtitle: dvdsub
    
    Stream #0.6[0x25]: Subtitle: dvdsub
    
    Stream #0.7[0x26]: Subtitle: dvdsub
    
    Stream #0.8[0x27]: Subtitle: dvdsub
    
    Stream #0.9[0x80]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
    Stream #0.10[0x81]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
At least one output file must be specified

    command

    avconv -i mymovie.VOB mymovie.mkv

    output

    avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
    
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
    
[mpeg @ 0x1cdad40] max_analyze_duration reached
    
Input #0, mpeg, from 'mymovie.VOB':
    
  Duration: 00:00:01.95, start: 0.280633, bitrate: -2147483 kb/s
    
    Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [PAR 8:9 DAR 4:3], 7500 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    
    Stream #0.1[0x20]: Subtitle: dvdsub
    
    Stream #0.2[0x21]: Subtitle: dvdsub
    
    Stream #0.3[0x22]: Subtitle: dvdsub
    
    Stream #0.4[0x23]: Subtitle: dvdsub
    
    Stream #0.5[0x24]: Subtitle: dvdsub
    
    Stream #0.6[0x25]: Subtitle: dvdsub
    
    Stream #0.7[0x26]: Subtitle: dvdsub
    
    Stream #0.8[0x27]: Subtitle: dvdsub
    
    Stream #0.9[0x80]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
    Stream #0.10[0x81]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
File 'mymovie.mkv' already exists. Overwrite ? [y/N] y
    
[buffer @ 0x1ce23c0] w:720 h:480 pixfmt:yuv420p
    
Output #0, matroska, to 'mymovie.mkv':
    
  Metadata:
    
    encoder         : Lavf53.21.1
    
    Stream #0.0: Video: mpeg4, yuv420p, 720x480 [PAR 8:9 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 29.97 tbc
    
    Stream #0.1: Audio: libvorbis, 48000 Hz, 5.1, s16
    
    Stream #0.2: Subtitle: ass, 200 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
    
  Stream #0:9 -> #0:1 (ac3 -> libvorbis)
    
  Stream #0:1 -> #0:2 (dvdsub -> ass)
    
Press ctrl-c to stop encoding
    
[ass @ 0x1ce0140] Only SUBTITLE_ASS type supported.
    
Subtitle encoding failed

    command

    avconv -i mymovie.VOB -c:s copy mymovie.mkv

    output omitted.

    command

    avconv -i mymovie.mkv

    output

    avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
    
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
    
[matroska,webm @ 0xbc1d40] Estimating duration from bitrate, this may be inaccurate
    
Input #0, matroska,webm, from 'mymovie.mkv':
    
  Metadata:
    
    ENCODER         : Lavf53.21.1
    
  Duration: 01:05:09.47, start: 0.000000, bitrate: N/A
    
    Stream #0.0: Video: mpeg4 (Simple Profile), yuv420p, 720x480 [PAR 8:9 DAR 4:3], 29.97 fps, 29.97 tbr, 1k tbn, 30k tbc (default)
    
    Stream #0.1: Audio: vorbis, 48000 Hz, 5.1, s16 (default)
    
    Stream #0.2: Subtitle: dvdsub (default)
    
At least one output file must be specified

    Now, for the double-layer :
    commands

    cat VTS_01_1.VOB VTS_01_2.VOB VTS_01_3.VOB VTS_01_4.VOB VTS_01_5.VOB VTS_01_6.VOB VTS_01_7.VOB VTS_01_8.VOB > ~/temp/mylongmovie.VOB
    
cd ~/temp
    
avconv -i mylongmovie.VOB mylongmovie.mkv

    output

    avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
    
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
    
[mpeg @ 0x13c2d40] max_analyze_duration reached
    
Input #0, mpeg, from 'Cosmos-0203.VOB':
    
  Duration: 00:00:30.24, start: 0.280633, bitrate: 2103365 kb/s
    
    Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [PAR 8:9 DAR 4:3], 8000 kb/s, 27.46 fps, 59.94 tbr, 90k tbn, 59.94 tbc
    
    Stream #0.1[0x20]: Subtitle: dvdsub
    
    Stream #0.2[0x21]: Subtitle: dvdsub
    
    Stream #0.3[0x22]: Subtitle: dvdsub
    
    Stream #0.4[0x23]: Subtitle: dvdsub
    
    Stream #0.5[0x24]: Subtitle: dvdsub
    
    Stream #0.6[0x25]: Subtitle: dvdsub
    
    Stream #0.7[0x26]: Subtitle: dvdsub
    
    Stream #0.8[0x27]: Subtitle: dvdsub
    
    Stream #0.9[0x81]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
    Stream #0.10[0x80]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
File 'mylongmovie.mkv' already exists. Overwrite ? [y/N] y
    
[buffer @ 0x13ca3c0] w:720 h:480 pixfmt:yuv420p
    
Output #0, matroska, to 'mylongmovie.mkv':
    
  Metadata:
    
    encoder         : Lavf53.21.1
    
    Stream #0.0: Video: mpeg4, yuv420p, 720x480 [PAR 8:9 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 59.94 tbc
    
    Stream #0.1: Audio: libvorbis, 48000 Hz, 5.1, s16
    
    Stream #0.2: Subtitle: ass, 200 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
    
  Stream #0:9 -> #0:1 (ac3 -> libvorbis)
    
  Stream #0:1 -> #0:2 (dvdsub -> ass)
    
Press ctrl-c to stop encoding
    
[ass @ 0x13d19c0] Only SUBTITLE_ASS type supported.
    
Subtitle encoding failed

    command

    avconv -i mylongmovie.VOB -c:s copy mylongmovie.mkv

    output

    avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
    
  built on Mar 30 2013 22:20:06 with gcc 4.7.2
    
[mpeg @ 0xce1d40] max_analyze_duration reached
    
Input #0, mpeg, from 'mylongmovie.VOB':
    
  Duration: 00:00:30.24, start: 0.280633, bitrate: 2103365 kb/s
    
    Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [PAR 8:9 DAR 4:3], 8000 kb/s, 27.46 fps, 59.94 tbr, 90k tbn, 59.94 tbc
    
    Stream #0.1[0x20]: Subtitle: dvdsub
    
    Stream #0.2[0x21]: Subtitle: dvdsub
    
    Stream #0.3[0x22]: Subtitle: dvdsub
    
    Stream #0.4[0x23]: Subtitle: dvdsub
    
    Stream #0.5[0x24]: Subtitle: dvdsub
    
    Stream #0.6[0x25]: Subtitle: dvdsub
    
    Stream #0.7[0x26]: Subtitle: dvdsub
    
    Stream #0.8[0x27]: Subtitle: dvdsub
    
    Stream #0.9[0x81]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
    Stream #0.10[0x80]: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
    
File 'mylongmovie.mkv' already exists. Overwrite ? [y/N] y
    
[buffer @ 0xce93c0] w:720 h:480 pixfmt:yuv420p
    
Output #0, matroska, to 'mylongmovie.mkv':
    
  Metadata:
    
    encoder         : Lavf53.21.1
    
    Stream #0.0: Video: mpeg4, yuv420p, 720x480 [PAR 8:9 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 59.94 tbc
    
    Stream #0.1: Audio: libvorbis, 48000 Hz, 5.1, s16
    
    Stream #0.2: Subtitle: dvdsub
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
    
  Stream #0:9 -> #0:1 (ac3 -> libvorbis)
    
  Stream #0:1 -> #0:2 (copy)
    
Press ctrl-c to stop encoding
    
[matroska @ 0xce4b40] Application provided invalid, non monotonically increasing dts to muxer in stream 2: 49 >= 49
    
av_interleaved_write_frame(): Invalid argument

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