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  • Configuration spécifique d’Apache

    4 février 2011, par

    Modules spécifiques
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    17 mai 2013, par

    Dans MédiaSPIP, une rubrique a 2 noms : catégorie et rubrique.
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  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
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Sur d’autres sites (7728)

  • Writing a series of images into a video file using libavcodec (ffmpeg)

    19 novembre 2013, par user2978372

    Requirements :

    I have a bunch of images (to be more specific they are 1024x768, 24bpp RGB PNG files) that I want to encode into a video files.

    And I need to use 'libavcodec' library, not 'ffmpeg' tool. (well I know they are basically same in the origin, I am emphasizing because someone may answer to use 'ffmpeg' tool, but that's not a solution what I am looking for)

    I am using h264 encoder.

    Target :
    A high quality video with equal resolution (1024 x 768), YUV420P
    each image has a duration of 1 second.
    24 fps

    Problems :
    i've tried with many different (but same resolution and bits) png images, and all have failed to output a good video.

    For some series of images, only the frames of first second was shown in a good shape, but the remaining frames was distorted and color changed (lighter).

    For some series of images, it seemed the images were zoomed-in and distorted again.

    and etc.

    Question :
    I am a total AV newbie and I need someone to verify my steps for encoding. I am total AV newbie.

    1) av_register_all()

    2) avcodec_register_all()

    3) avcodec_find_encoder()

    4) avcodec_alloc_context3()

    5) sets codec configuraton to context.

    6) avcodec_open2()

    7) opens a output file using fopen_s()

    8)

    for(int second=1; second<=10; ++seconds)
    
{
    

    
  Read a image from local using Gdiplus
    

    
  Create a gdiplus bitmap and draw the image onto this bitmap
    

    
  Get the raw byte data using LockBits
    

    
  Transfer this RGB raw byte into YUV420 frame using 'swscontext', 'sws_scale'
    

    
  for(int f=0; f<24; ++f)
    
  {
    
    av_init_packet(&pkt);
    
    pkt.data = NULL;
    
    pkt.size = 0;
    

    
    pFrame->pts = f;
    
    ret = avcodec_encode_video2(pContext, &pkt, pFrame, &got_output);
    

    
    if(got_output)
    
    {
    
        fwrite(pkt.data, 1, pkt.size, outputFile);
    
        av_free_packet(&pkt);
    
    }
    
  }
    
}
    

    
/* get the delayed frames */
    
for (got_output = 1; got_output; i++) {
    
    fflush(stdout);
    

    
    ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
    
    if (ret < 0) {
    
        fprintf(stderr, "Error encoding frame\n");
    
        exit(1);
    
    }
    

    
    if (got_output) {
    
        printf("Write frame %3d (size=%5d)\n", i, pkt.size);
    
        fwrite(pkt.data, 1, pkt.size, f);
    
        av_free_packet(&pkt);
    
    }
    
}
    

    
close everything required

    I am sure that I misunderstood some steps using ffmpeg api. The above pseudo codes are based on the 'encoding' example of ffmpeg. which part am I doing wrong ? please can someone help me ?

    p.s sorry about broken english. english is not my natvie language. I tried my best =P

  • ffmpeg - Converting series of images to video (Ubuntu)

    12 septembre 2018, par Kapa11

    I got pictures named as

    pic_0_new.jpg
    
pic_10_new.jpg
    
pic_20_new.jpg
    
...
    
pic_1050_new.jpg

    which I want to turn into a video (Ubuntu ffmpeg). I tried the following

    ffmpeg -start_number 0 -i pic_%d_new.jpg -vcodec mpeg4 test.avi

    but I don’t know how to set the step size and the end number. How to do this ?

    Thanks for help :)

  • ffmpeg : trsfer a h264 video to a series of jpg failed

    21 juin 2018, par 徐立派

    me and a partner are trying to transfer a h264 video to a series of images using ffmpeg with the following command line :

    ffmpeg -i input.h264 -qscale:v 2 output_%03d.jpg

    The input.h264 can be played perfectly on vlc, but the images generated by ffmpeg are just all black. The message in the console are below :

    ffmpeg version 3.4.2-2 Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu2)
    
  configuration: --prefix=/usr --extra-version=2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
    
  libavutil      55. 78.100 / 55. 78.100
    
  libavcodec     57.107.100 / 57.107.100
    
  libavformat    57. 83.100 / 57. 83.100
    
  libavdevice    57. 10.100 / 57. 10.100
    
  libavfilter     6.107.100 /  6.107.100
    
  libavresample   3.  7.  0 /  3.  7.  0
    
  libswscale      4.  8.100 /  4.  8.100
    
  libswresample   2.  9.100 /  2.  9.100
    
  libpostproc    54.  7.100 / 54.  7.100
    
[h264 @ 0x562ab2afd9e0] error while decoding MB 54 2, bytestream -16
    
[h264 @ 0x562ab2afd9e0] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2afd9e0] error while decoding MB 2 9, bytestream 6907
    
[h264 @ 0x562ab2afd9e0] concealing 1275 DC, 1275 AC, 1275 MV errors in P frame
    
[h264 @ 0x562ab2afd9e0] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2afd9e0] error while decoding MB 27 0, bytestream 5564
    
[h264 @ 0x562ab2afd9e0] deblocking filter parameters 7 13 out of range
    
[h264 @ 0x562ab2afd9e0] decode_slice_header error
    
[h264 @ 0x562ab2afd9e0] concealing 1440 DC, 1440 AC, 1440 MV errors in P frame
    
[h264 @ 0x562ab2afd9e0] deblocking filter parameters 7 -14 out of range
    
[h264 @ 0x562ab2afd9e0] decode_slice_header error
    
[h264 @ 0x562ab2afd9e0] concealing 1387 DC, 1387 AC, 1387 MV errors in P frame
    
[h264 @ 0x562ab2afd9e0] deblocking filter parameters -7 0 out of range
    
[h264 @ 0x562ab2afd9e0] decode_slice_header error
    
[h264 @ 0x562ab2afd9e0] concealing 1413 DC, 1413 AC, 1413 MV errors in P frame
    
[h264 @ 0x562ab2afd9e0] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2afd9e0] error while decoding MB 9 0, bytestream 6647
    
[h264 @ 0x562ab2afd9e0] concealing 1186 DC, 1186 AC, 1186 MV errors in P frame
    
[h264 @ 0x562ab2afd9e0] top block unavailable for requested intra mode
    
[h264 @ 0x562ab2afd9e0] error while decoding MB 16 9, bytestream 6182
    
[h264 @ 0x562ab2afd9e0] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2afd9e0] error while decoding MB 6 18, bytestream 7043
    
[h264 @ 0x562ab2afd9e0] concealing 1440 DC, 1440 AC, 1440 MV errors in P frame
    
[h264 @ 0x562ab2afc8c0] Stream #0: not enough frames to estimate rate; consider increasing probesize
    
Input #0, h264, from 'temp_file.h264':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0:0: Video: h264 (High), yuvj420p(pc, progressive), 1280x720, 29.97 fps, 29.97 tbr, 1200k tbn, 59.94 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
    
Press [q] to stop, [?] for help
    
[h264 @ 0x562ab2b2f900] error while decoding MB 54 2, bytestream -16
    
[h264 @ 0x562ab2b2f900] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2b2f900] error while decoding MB 2 9, bytestream 6907
    
[h264 @ 0x562ab2b2f900] concealing 1275 DC, 1275 AC, 1275 MV errors in P frame
    
[h264 @ 0x562ab2b01080] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2b01080] error while decoding MB 27 0, bytestream 5564
    
[h264 @ 0x562ab2b01080] deblocking filter parameters 7 13 out of range
    
[h264 @ 0x562ab2b01080] decode_slice_header error
    
[h264 @ 0x562ab2b01080] concealing 1440 DC, 1440 AC, 1440 MV errors in P frame
    
[h264 @ 0x562ab2c49240] deblocking filter parameters 7 -14 out of range
    
[h264 @ 0x562ab2c49240] decode_slice_header error
    
[h264 @ 0x562ab2c49240] concealing 1387 DC, 1387 AC, 1387 MV errors in P frame
    
Output #0, image2, to 'output_%03d.jpg':
    
  Metadata:
    
    encoder         : Lavf57.83.100
    
    Stream #0:0: Video: mjpeg, yuvj420p(pc), 1280x720, q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc
    
    Metadata:
    
      encoder         : Lavc57.107.100 mjpeg
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
    
[h264 @ 0x562ab2b7fec0] deblocking filter parameters -7 0 out of range
    
[h264 @ 0x562ab2b7fec0] decode_slice_header error
    
[h264 @ 0x562ab2b7fec0] concealing 1413 DC, 1413 AC, 1413 MV errors in P frame
    
[h264 @ 0x562ab2c15240] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2c15240] error while decoding MB 9 0, bytestream 6647
    
[h264 @ 0x562ab2c15240] concealing 1186 DC, 1186 AC, 1186 MV errors in P frame
    
[h264 @ 0x562ab2c315a0] top block unavailable for requested intra mode
    
[h264 @ 0x562ab2c315a0] error while decoding MB 16 9, bytestream 6182
    
[h264 @ 0x562ab2c315a0] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2c315a0] error while decoding MB 6 18, bytestream 7043
    
[h264 @ 0x562ab2c315a0] concealing 1440 DC, 1440 AC, 1440 MV errors in P frame
    
[h264 @ 0x562ab2c447a0] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2c447a0] error while decoding MB 12 9, bytestream 6863
    
[h264 @ 0x562ab2c447a0] concealing 1342 DC, 1342 AC, 1342 MV errors in P frame
    
[h264 @ 0x562ab2bb9180] top block unavailable for requested intra mode
    
[h264 @ 0x562ab2bb9180] error while decoding MB 29 18, bytestream 6611
    
[h264 @ 0x562ab2bb9180] concealing 1405 DC, 1405 AC, 1405 MV errors in P frame
    
[h264 @ 0x562ab2bd54e0] top block unavailable for requested intra mode
    
[h264 @ 0x562ab2bd54e0] error while decoding MB 25 9, bytestream 6051
    
[h264 @ 0x562ab2bd54e0] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2bd54e0] error while decoding MB 70 18, bytestream 5088
    
[h264 @ 0x562ab2bd54e0] concealing 1419 DC, 1419 AC, 1419 MV errors in P frame
    
[h264 @ 0x562ab2bf1840] top block unavailable for requested intra mode
    
[h264 @ 0x562ab2bf1840] error while decoding MB 14 9, bytestream 6071
    
[h264 @ 0x562ab2bf1840] deblocking filter parameters -9 0 out of range
    
[h264 @ 0x562ab2bf1840] decode_slice_header error
    
[h264 @ 0x562ab2bf1840] concealing 1440 DC, 1440 AC, 1440 MV errors in P frame
    
[h264 @ 0x562ab318e0a0] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab318e0a0] error while decoding MB 54 9, bytestream 4422
    
[h264 @ 0x562ab318e0a0] concealing 1256 DC, 1256 AC, 1256 MV errors in P frame
    
[h264 @ 0x562ab31aa020] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab31aa020] error while decoding MB 22 9, bytestream 5862
    
[h264 @ 0x562ab31aa020] concealing 1335 DC, 1335 AC, 1335 MV errors in P frame
    
[h264 @ 0x562ab2d5a8c0] deblocking filter parameters 7 -4 out of range
    
[h264 @ 0x562ab2d5a8c0] decode_slice_header error
    
[h264 @ 0x562ab2d5a8c0] concealing 1430 DC, 1430 AC, 1430 MV errors in P frame
    
[h264 @ 0x562ab2b2f900] concealing 1319 DC, 1319 AC, 1319 MV errors in P frame
    
[h264 @ 0x562ab2b01080] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2b01080] error while decoding MB 16 9, bytestream 6218
    
[h264 @ 0x562ab2b01080] concealing 1416 DC, 1416 AC, 1416 MV errors in P frame
    
[h264 @ 0x562ab2c49240] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2c49240] error while decoding MB 12 0, bytestream 6854
    
[h264 @ 0x562ab2c49240] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2c49240] error while decoding MB 2 9, bytestream 7092
    
[h264 @ 0x562ab2c49240] concealing 1440 DC, 1440 AC, 1440 MV errors in P frame
    
[h264 @ 0x562ab2b7fec0] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2b7fec0] error while decoding MB 59 0, bytestream 4955
    
[h264 @ 0x562ab2b7fec0] deblocking filter parameters 7 15 out of range
    
[h264 @ 0x562ab2b7fec0] decode_slice_header error
    
[h264 @ 0x562ab2b7fec0] concealing 1430 DC, 1430 AC, 1430 MV errors in P frame
    
[h264 @ 0x562ab2c15240] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2c15240] error while decoding MB 34 0, bytestream 5338
    
[h264 @ 0x562ab2c15240] deblocking filter parameters 7 13 out of range
    
[h264 @ 0x562ab2c15240] decode_slice_header error
    
[h264 @ 0x562ab2c15240] concealing 1440 DC, 1440 AC, 1440 MV errors in P frame
    
[h264 @ 0x562ab2c315a0] concealing 1344 DC, 1344 AC, 1344 MV errors in P frame
    
[h264 @ 0x562ab2c447a0] top block unavailable for requested intra mode -1
    
[h264 @ 0x562ab2c447a0] error while decoding MB 49 9, bytestream 4992
    
[h264 @ 0x562ab2c447a0] concealing 1228 DC, 1228 AC, 1228 MV errors in P frame
    
frame=   21 fps=0.0 q=2.0 Lsize=N/A time=00:00:00.70 bitrate=N/A speed=1.31x    
    
video:601kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

    However, this command works perfectly fine on random h264 videoes on the internet, so I guess there may be something wrong with our h264 video, but the weird thing is that it can be played by vlc player just fine...

    Any idea what the problem can be ? Any help will be appreciated !

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