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Autres articles (41)

  • XMP PHP

    13 mai 2011, par

    Dixit Wikipedia, XMP signifie :
    Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
    Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
    XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...)

  • Participer à sa documentation

    10 avril 2011

    La documentation est un des travaux les plus importants et les plus contraignants lors de la réalisation d’un outil technique.
    Tout apport extérieur à ce sujet est primordial : la critique de l’existant ; la participation à la rédaction d’articles orientés : utilisateur (administrateur de MediaSPIP ou simplement producteur de contenu) ; développeur ; la création de screencasts d’explication ; la traduction de la documentation dans une nouvelle langue ;
    Pour ce faire, vous pouvez vous inscrire sur (...)

  • Encodage et transformation en formats lisibles sur Internet

    10 avril 2011

    MediaSPIP transforme et ré-encode les documents mis en ligne afin de les rendre lisibles sur Internet et automatiquement utilisables sans intervention du créateur de contenu.
    Les vidéos sont automatiquement encodées dans les formats supportés par HTML5 : MP4, Ogv et WebM. La version "MP4" est également utilisée pour le lecteur flash de secours nécessaire aux anciens navigateurs.
    Les documents audios sont également ré-encodés dans les deux formats utilisables par HTML5 :MP3 et Ogg. La version "MP3" (...)

Sur d’autres sites (6693)

  • Anomalie #2676 : IE8 : les onchange et tests checked ont des comportements bizarres

    26 mars 2013, par marcimat -

    Peut être pas si loin que ça. Chez jQuery ils disaient « jQuery 2.0 (early 2013, not long after 1.9) ». On était à la béta 2 le 1er mars dernier. Donc, ça risque d’être dans la 3.1 à ce train là :) [oups] Ce message était destiné à #2965[/oups]

  • FFMPEG : i need audio channels 7 & 8 to be the main audio track for a video

    10 avril 2013, par lo_fye

    I have a video with 8 channels of audio.

    I need tracks 7 (Left Stereo) and 8 (Right Stereo) to be the audio for the video (which I'm converting to flv).

    I've tried playing with -filter_complex and the join, amix, and amerge filters, as well as the -map parameter, but I can't seem to find the right combination of values :-/

    Output :

    /usr/local/bin/ffmpeg-1.0/bin/ffmpeg -i '/folder/video_name.mov' -f 'flv' \
    
-s '320x240' -b '250k' -aspect '4:3' -ac 1 -ab '64k' -ar '22050' -y \
    
/folder/video_name.flv
    

    
ffmpeg version N-46241-g09ea482 Copyright (c) 2000-2012 the FFmpeg developers
    
  built on Nov  5 2012 07:33:09 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-46)
    
  configuration: --prefix=/usr/local/bin/ffmpeg-1.0
    
  libavutil      52.  1.100 / 52.  1.100
    
  libavcodec     54. 70.100 / 54. 70.100
    
  libavformat    54. 35.100 / 54. 35.100
    
  libavdevice    54.  3.100 / 54.  3.100
    
  libavfilter     3. 21.105 /  3. 21.105
    
  libswscale      2.  1.101 /  2.  1.101
    
  libswresample   0. 16.100 /  0. 16.100
    
Guessed Channel Layout for  Input Stream #0.1 : mono
    
Guessed Channel Layout for  Input Stream #0.2 : mono
    
Guessed Channel Layout for  Input Stream #0.3 : mono
    
Guessed Channel Layout for  Input Stream #0.4 : mono
    
Guessed Channel Layout for  Input Stream #0.5 : mono
    
Guessed Channel Layout for  Input Stream #0.6 : mono
    
Guessed Channel Layout for  Input Stream #0.7 : mono
    
Guessed Channel Layout for  Input Stream #0.8 : mono
    
Guessed Channel Layout for  Input Stream #0.9 : mono
    
Guessed Channel Layout for  Input Stream #0.10 : mono
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/folder/video_name.mov':
    
  Metadata:
    
    major_brand     : qt
    
    minor_version   : 537199360
    
    compatible_brands: qt
    
    creation_time   : 2013-04-03 19:45:26
    
  Duration: 00:00:39.03, start: 0.000000, bitrate: 122149 kb/s
    
    Stream #0:0(eng): Video: prores (apch / 0x68637061), yuv422p10le, 1920x1080, 110585 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 23976 tbn, 23976 tbc
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 00:59:53:00
    
    Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:2(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:3(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:4(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:5(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:6(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:7(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:8(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:9(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:10(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, mono, s32, 1152 kb/s
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:11(eng): Data: none (tmcd / 0x64636D74)
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:30
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 00:59:53:00
    
Please use -b:a or -b:v, -b is ambiguous
    
Output #0, flv, to '/folder/video_name.flv':
    
  Metadata:
    
    major_brand     : qt
    
    minor_version   : 537199360
    
    compatible_brands: qt
    
    encoder         : Lavf54.35.100
    
    Stream #0:0(eng): Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 250 kb/s, 1k tbn, 23.98 tbc
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 00:59:53:00
    
    Stream #0:1(eng): Audio: adpcm_swf ([1][0][0][0] / 0x0001), 22050 Hz, mono, s16, 88 kb/s
    
    Metadata:
    
      creation_time   : 2013-04-03 19:45:26
    
      handler_name    : Apple Alias Data Handler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (prores -> flv)
    
  Stream #0:1 -> #0:1 (pcm_s24le -> adpcm_swf)
    
Press [q] to stop, [?] for help
    
frame=   33 fps=0.0 q=2.0 size=     108kB time=00:00:01.99 bitrate= 442.4kbits/s    
    
frame=   66 fps= 65 q=2.0 size=     225kB time=00:00:02.97 bitrate= 619.0kbits/s    
    
frame=   99 fps= 65 q=2.0 size=     341kB time=00:00:04.96 bitrate= 561.8kbits/s    
    
frame=  136 fps= 67 q=2.0 size=     400kB time=00:00:05.99 bitrate= 547.5kbits/s    
    
frame=  177 fps= 70 q=3.0 size=     482kB time=00:00:07.98 bitrate= 494.3kbits/s    
    
frame=  210 fps= 69 q=3.7 size=     590kB time=00:00:08.96 bitrate= 539.7kbits/s    
    
frame=  240 fps= 68 q=6.3 size=     660kB time=00:00:10.01 bitrate= 539.7kbits/s    
    
frame=  264 fps= 65 q=6.7 size=     719kB time=00:00:11.01 bitrate= 535.2kbits/s    
    
frame=  288 fps= 63 q=8.4 size=     772kB time=00:00:12.02 bitrate= 526.1kbits/s    
    
frame=  312 fps= 62 q=15.4 size=     829kB time=00:00:13.65 bitrate= 497.4kbits/s    
    
frame=  336 fps= 60 q=10.4 size=     875kB time=00:00:14.02 bitrate= 511.1kbits/s    
    
frame=  360 fps= 59 q=10.6 size=     916kB time=00:00:15.01 bitrate= 499.9kbits/s    
    
frame=  383 fps= 58 q=17.8 size=     957kB time=00:00:15.97 bitrate= 490.6kbits/s    
    
frame=  411 fps= 58 q=6.5 size=    1008kB time=00:00:17.97 bitrate= 459.3kbits/s    
    
frame=  437 fps= 57 q=9.7 size=    1046kB time=00:00:18.99 bitrate= 451.3kbits/s    
    
frame=  460 fps= 57 q=7.7 size=    1086kB time=00:00:20.01 bitrate= 444.6kbits/s    
    
frame=  489 fps= 57 q=11.3 size=    1144kB time=00:00:20.99 bitrate= 446.3kbits/s    
    
frame=  512 fps= 56 q=10.3 size=    1182kB time=00:00:22.01 bitrate= 439.8kbits/s    
    
frame=  535 fps= 55 q=21.5 size=    1225kB time=00:00:22.98 bitrate= 436.7kbits/s    
    
frame=  564 fps= 55 q=18.3 size=    1280kB time=00:00:24.00 bitrate= 436.8kbits/s    
    
frame=  587 fps= 55 q=8.5 size=    1311kB time=00:00:24.98 bitrate= 429.7kbits/s    
    
frame=  610 fps= 54 q=11.9 size=    1349kB time=00:00:26.00 bitrate= 424.9kbits/s    
    
frame=  636 fps= 54 q=7.5 size=    1383kB time=00:00:26.98 bitrate= 419.8kbits/s    
    
frame=  659 fps= 54 q=9.6 size=    1421kB time=00:00:28.00 bitrate= 415.6kbits/s    
    
frame=  683 fps= 54 q=20.0 size=    1471kB time=00:00:29.02 bitrate= 415.1kbits/s    
    
frame=  711 fps= 54 q=6.4 size=    1518kB time=00:00:30.00 bitrate= 414.5kbits/s    
    
frame=  742 fps= 54 q=6.2 size=    1558kB time=00:00:31.02 bitrate= 411.5kbits/s    
    
frame=  774 fps= 54 q=2.5 size=    1601kB time=00:00:33.01 bitrate= 397.1kbits/s    
    
frame=  816 fps= 55 q=2.0 size=    1632kB time=00:00:34.50 bitrate= 387.6kbits/s    
    
frame=  861 fps= 56 q=2.0 size=    1670kB time=00:00:35.99 bitrate= 380.1kbits/s    
    
frame=  905 fps= 57 q=2.0 size=    1706kB time=00:00:38.03 bitrate= 367.4kbits/s    
    
frame=  936 fps= 58 q=2.0 Lsize=    1730kB time=00:00:39.05 bitrate= 362.8kbits/s
    
video:1278kB audio:423kB subtitle:0 global headers:0kB muxing overhead 1.654557%

  • Streaming video from an image using FFMPEG on Windows

    26 mai 2013, par Daniel Zohar

    I wrote a program that simulates a camera and converts the output into a video stream. The program is required to be able to run on Windows.
    There are two components in the system :

    1. Camera Simulator. A C++ program that simulates the camera. It copies a pre-generated frame (i.e. PNG file) every 0.1 seconds, using the windows copy command, to a destination path ./target/target_image.png
    2. Video Stream. Using FFmpeg, it creates a video stream out of the copied images. FFmpeg is ran with the following command :
      ffmpeg -loop 1 -i ./target/target_image.png -r 10 -vcodec mpeg4 -f mpegts udp://127.0.0.1:1234

    When running the whole thing together, it works fine for a few seconds until the ffmpeg halts. Here is a log while running in debug mode :

    ffmpeg version N-52458-gaa96439 Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Apr 24 2013 22:19:32 with gcc 4.8.0 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
    
  libavutil      52. 27.101 / 52. 27.101
    
  libavcodec     55.  6.100 / 55.  6.100
    
  libavformat    55.  3.100 / 55.  3.100
    
  libavdevice    55.  0.100 / 55.  0.100
    
  libavfilter     3. 60.101 /  3. 60.101
    
  libswscale      2.  2.100 /  2.  2.100
    
  libswresample   0. 17.102 /  0. 17.102
    
  libpostproc    52.  3.100 / 52.  3.100
    
Splitting the commandline.
    
Reading option '-loop' ... matched as AVOption 'loop' with argument '1'.
    
Reading option '-i' ... matched as input file with argument './target/target_image.png'.
    
Reading option '-r' ... matched as option 'r' (set frame rate (Hz value, fraction or abbreviation)) with argument '10'.
    
Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'mpeg4'.
    
Reading option '-f' ... matched as option 'f' (force format) with argument 'mpegts'.
    
Reading option 'udp://127.0.0.1:1234' ... matched as output file.
    
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
    
Finished splitting the commandline.
    
Parsing a group of options: global .
    
Applying option loglevel (set logging level) with argument debug.
    
Successfully parsed a group of options.
    
Parsing a group of options: input file ./target/target_image.png.
    
Successfully parsed a group of options.
    
Opening an input file: ./target/target_image.png.
    
[AVIOContext @ 02678840] Statistics: 234307 bytes read, 0 seeks
    
[AVIOContext @ 02678840] Statistics: 221345 bytes read, 0 seeks
    
    Last message repeated 1 times
    
[AVIOContext @ 02678840] Statistics: 226329 bytes read, 0 seeks
    
    Last message repeated 2 times
    
[AVIOContext @ 02678840] Statistics: 228676 bytes read, 0 seeks
    
    Last message repeated 2 times
    
[AVIOContext @ 02678840] Statistics: 230685 bytes read, 0 seeks
    
    Last message repeated 2 times
    
[AVIOContext @ 02678840] Statistics: 232697 bytes read, 0 seeks
    
    Last message repeated 5 times
    
[AVIOContext @ 02678840] Statistics: 234900 bytes read, 0 seeks
    
    Last message repeated 2 times
    
[AVIOContext @ 02678840] Statistics: 236847 bytes read, 0 seeks
    
[image2 @ 02677ac0] Probe buffer size limit of 5000000 bytes reached
    
Input #0, image2, from './target/target_image.png':
    
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    
    Stream #0:0, 22, 1/25: Video: png, rgb24, 1274x772 [SAR 1:1 DAR 637:386], 1/25, 25 fps, 25 tbr, 25 tbn, 25 tbc
    
Successfully opened the file.
    
Parsing a group of options: output file udp://127.0.0.1:1234.
    
Applying option r (set frame rate (Hz value, fraction or abbreviation)) with argument 10.
    
Applying option vcodec (force video codec ('copy' to copy stream)) with argument mpeg4.
    
Applying option f (force format) with argument mpegts.
    
Successfully parsed a group of options.
    
Opening an output file: udp://127.0.0.1:1234.
    
Successfully opened the file.
    
[graph 0 input from stream 0:0 @ 02769280] Setting 'video_size' to value '1274x772'
    
[graph 0 input from stream 0:0 @ 02769280] Setting 'pix_fmt' to value '2'
    
[graph 0 input from stream 0:0 @ 02769280] Setting 'time_base' to value '1/25'
    
[graph 0 input from stream 0:0 @ 02769280] Setting 'pixel_aspect' to value '1/1'
    
[graph 0 input from stream 0:0 @ 02769280] Setting 'sws_param' to value 'flags=2'
    
[graph 0 input from stream 0:0 @ 02769280] Setting 'frame_rate' to value '25/1'
    
[graph 0 input from stream 0:0 @ 02769280] w:1274 h:772 pixfmt:rgb24 tb:1/25 fr:25/1 sar:1/1 sws_param:flags=2
    
[format @ 02768ba0] compat: called with args=[yuv420p]
    
[format @ 02768ba0] Setting 'pix_fmts' to value 'yuv420p'
    
[auto-inserted scaler 0 @ 02768740] Setting 'w' to value '0'
    
[auto-inserted scaler 0 @ 02768740] Setting 'h' to value '0'
    
[auto-inserted scaler 0 @ 02768740] Setting 'flags' to value '0x4'
    
[auto-inserted scaler 0 @ 02768740] w:0 h:0 flags:'0x4' interl:0
    
[format @ 02768ba0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
    
[AVFilterGraph @ 026772c0] query_formats: 4 queried, 3 merged, 1 already done, 0 delayed
    
[auto-inserted scaler 0 @ 02768740] w:1274 h:772 fmt:rgb24 sar:1/1 -> w:1274 h:772 fmt:yuv420p sar:1/1 flags:0x4
    
[mpeg4 @ 02785020] detected 4 logical cores
    
[mpeg4 @ 02785020] intra_quant_bias = 0 inter_quant_bias = -64
    
[mpegts @ 0277da40] muxrate VBR, pcr every 1 pkts, sdt every 200, pat/pmt every 40 pkts
    
Output #0, mpegts, to 'udp://127.0.0.1:1234':
    
  Metadata:
    
    encoder         : Lavf55.3.100
    
    Stream #0:0, 0, 1/90000: Video: mpeg4, yuv420p, 1274x772 [SAR 1:1 DAR 637:386], 1/10, q=2-31, 200 kb/s, 90k tbn, 10 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (png -> mpeg4)
    
Press [q] to stop, [?] for help
    
*** drop!
    
    Last message repeated 10 times
    
frame=   11 fps=0.0 q=4.0 size=     118kB time=00:00:01.10 bitrate= 875.1kbits/s dup=0 drop=11    
    
Statistics: 242771 bytes read, 0 seeks
    
[AVIOContext @ 02674a60] Statistics: 246525 bytes read, 0 seeks
    
*** drop!
    
[AVIOContext @ 02674a60] Statistics: 230678 bytes read, 0 seeks
    
[AVIOContext @ 02674a60] Statistics: 244023 bytes read, 0 seeks
    
*** drop!
    
[AVIOContext @ 02674a60] Statistics: 246389 bytes read, 0 seeks
    

    
*** drop!
    
[AVIOContext @ 02674a60] Statistics: 224478 bytes read, 0 seeks
    
[AVIOContext @ 02674a60] Statistics: 228013 bytes read, 0 seeks
    
*** drop!
    
[image2 @ 02677ac0] Could not open file : ./target/target_image.png
    
./target/target_image.png: Input/output error
    
[output stream 0:0 @ 02768c20] EOF on sink link output stream 0:0:default.
    
No more output streams to write to, finishing.
    
frame=  164 fps= 17 q=31.0 Lsize=     959kB time=00:00:16.40 bitrate= 478.9kbits/s dup=0 drop=240    
    

    
video:869kB audio:0kB subtitle:0 global headers:0kB muxing overhead 10.285235%
    
404 frames successfully decoded, 0 decoding errors
    
[AVIOContext @ 026779c0] Statistics: 0 seeks, 746 writeouts

    It seems to me there's some kind of collision between the reading and writing to/from the same file. What's also interesting is that on Linux (while replacing the copy with cp) the program works just fine.

    Can someone suggest a way to solve this issue ? Alternatives solutions are also acceptable as long as the logical workflow remains the same.

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