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  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • Le plugin : Podcasts.

    14 juillet 2010, par

    Le problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
    Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
    Types de fichiers supportés dans les flux
    Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...)

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

Sur d’autres sites (10652)

  • lavc/ppc/svq1enc_altivec : Fix function prototype after dad31083.

    1er novembre 2017, par Carl Eugen Hoyos
    lavc/ppc/svq1enc_altivec : Fix function prototype after dad31083.

    Silences a gcc warning :
    
src/libavcodec/ppc/svq1enc_altivec.c : In function 'ff_svq1enc_init_ppc' :
    
src/libavcodec/ppc/svq1enc_altivec.c:80:26 : warning : assignment from incompatible pointer type
    • [DH] libavcodec/ppc/svq1enc_altivec.c

  • lavfi/vf_libvmaf : convert to framesync2.

    31 juillet 2017, par Nicolas George
    lavfi/vf_libvmaf : convert to framesync2.

    After this commit, the code compiles, but on my setup it
    
segfaults before and after. It also prints the very worrying
    
warning :
    

    src/libavfilter/vf_libvmaf.c:161:66 : warning : passing argument 4 of ‘compute_vmaf’ from incompatible pointer type [-Wincompatible-pointer-types]
    
/tmp/i/include/libvmaf.h:26:8 : note : expected ‘int (*)(float *, float *, float *, int,  void *)’ but argument is of type ‘int (*)(float *, float *, float *, int,  double *, void *)’
    

    ==12116== Thread 6 :
    
==12116== Conditional jump or move depends on uninitialised value(s)
    
==12116==    at 0x526D432 : cons_ (ocval.h:1188)
    
==12116==    by 0x526D432 : GenericIT (ocval.h:1119)
    
==12116==    by 0x526D432 : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:92)
    
==12116==    by 0x5211F5D : loads (pickleloader.h:566)
    
==12116==    by 0x5211F5D : LoadValFromArray (chooseser.h:290)
    
==12116==    by 0x5211F5D : LoadValFromFile (chooseser.h:405)
    
==12116==    by 0x5211F5D : _read_and_assert_model(char const*, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&) (vmaf.cpp:77)
    
==12116==    by 0x5212B0F : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:149)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    
==12116==
    
==12116== Conditional jump or move depends on uninitialised value(s)
    
==12116==    at 0x526D432 : cons_ (ocval.h:1188)
    
==12116==    by 0x526D432 : GenericIT (ocval.h:1119)
    
==12116==    by 0x526D432 : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:92)
    
==12116==    by 0x526D50D : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:94)
    
==12116==    by 0x5211F5D : loads (pickleloader.h:566)
    
==12116==    by 0x5211F5D : LoadValFromArray (chooseser.h:290)
    
==12116==    by 0x5211F5D : LoadValFromFile (chooseser.h:405)
    
==12116==    by 0x5211F5D : _read_and_assert_model(char const*, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&) (vmaf.cpp:77)
    
==12116==    by 0x5212B0F : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:149)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    
==12116==
    
==12116== Conditional jump or move depends on uninitialised value(s)
    
==12116==    at 0x526D432 : cons_ (ocval.h:1188)
    
==12116==    by 0x526D432 : GenericIT (ocval.h:1119)
    
==12116==    by 0x526D432 : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:92)
    
==12116==    by 0x526D50D : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:94)
    
==12116==    by 0x526D50D : OC::TranslateForNumPyClassesToArray(OC::Val&) (pickleloader.h:94)
    
==12116==    by 0x5211F5D : loads (pickleloader.h:566)
    
==12116==    by 0x5211F5D : LoadValFromArray (chooseser.h:290)
    
==12116==    by 0x5211F5D : LoadValFromFile (chooseser.h:405)
    
==12116==    by 0x5211F5D : _read_and_assert_model(char const*, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&, OC::Val&) (vmaf.cpp:77)
    
==12116==    by 0x5212B0F : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:149)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    
==12116==
    
==12116== Use of uninitialised value of size 8
    
==12116==    at 0x518AC79 : read_frame_8bit (vf_libvmaf.c:147)
    
==12116==    by 0x52AB5E8 : combo (combo.c:149)
    
==12116==    by 0x5212E95 : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:278)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    
==12116==
    
==12116== Invalid read of size 4
    
==12116==    at 0x518AC79 : read_frame_8bit (vf_libvmaf.c:147)
    
==12116==    by 0x52AB5E8 : combo (combo.c:149)
    
==12116==    by 0x5212E95 : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:278)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    
==12116==  Address 0x40 is not stack'd, malloc'd or (recently) free'd
    
==12116==
    
==12116==
    
==12116== Process terminating with default action of signal 11 (SIGSEGV)
    
==12116==  Access not within mapped region at address 0x40
    
==12116==    at 0x518AC79 : read_frame_8bit (vf_libvmaf.c:147)
    
==12116==    by 0x52AB5E8 : combo (combo.c:149)
    
==12116==    by 0x5212E95 : VmafRunner::run(Asset, int (*)(float*, float*, float*, int, void*), void*, bool, bool, bool, bool, bool) (vmaf.cpp:278)
    
==12116==    by 0x52165B6 : RunVmaf(char const*, int, int, int (*)(float*, float*, float*, int, void*), void*, char const*, char const*, char const*, bool, bool, bool, bool, bool, char const*) (vmaf.cpp:645)
    
==12116==    by 0x518AFFF : compute_vmaf_score (vf_libvmaf.c:161)
    
==12116==    by 0x518AFFF : call_vmaf (vf_libvmaf.c:170)
    
==12116==    by 0x7967493 : start_thread (pthread_create.c:333)
    
==12116==    by 0x7F69A8E : clone (clone.S:97)
    • [DH] libavfilter/Makefile
    • [DH] libavfilter/vf_libvmaf.c

  • FFMPEG encode video with alpha channel to flv

    29 novembre 2017, par tree

    I’m trying to encode a video (mov) to an flv with alpha channel in FFMPEG but I can’t seem to either

    1. find a codec that is supported
    2. find one that actually maintains the alpha

    Does anyone know how to set that up ?

    Thanks,

    ffmpeg -i abc_btr_1280x800_Takeover.mov -vcodec flv -pix_fmt yuv444p -s 1280x800 test4.flv

    here is the report...

    ffmpeg started on 2013-10-25 at 15:47:30
    
Report written to "ffmpeg-20131025-154730.log"
    
Command line: 
    
ffmpeg -i abc_btr_1280x800_Takeover.mov -vcodec flv -pix_fmt yuv444p -s 1280x800     test4.flv -report
    
ffmpeg version N-57367-g2f31b73 Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Oct 23 2013 20:34:17 with gcc 4.8.2 (GCC)
    
  configuration: --disable-static --enable-shared --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-libmodplug --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-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
    
  libavutil      52. 47.101 / 52. 47.101
    
  libavcodec     55. 38.101 / 55. 38.101
    
  libavformat    55. 19.104 / 55. 19.104
    
  libavdevice    55.  4.100 / 55.  4.100
    
  libavfilter     3. 89.100 /  3. 89.100
    
  libswscale      2.  5.101 /  2.  5.101
    
  libswresample   0. 17.104 /  0. 17.104
    
  libpostproc    52.  3.100 / 52.  3.100
    
Splitting the commandline.
    
Reading option '-i' ... matched as input file with argument     'abc_btr_1280x800_Takeover.mov'.
    
Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to     copy stream)) with argument 'flv'.
    
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv444p'.
    
Reading option '-s' ... matched as option 's' (set frame size (WxH or abbreviation)) with argument '1280x800'.
    
Reading option 'test4.flv' ... matched as output file.
    
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
    
Finished splitting the commandline.
    
Parsing a group of options: global .
    
Applying option report (generate a report) with argument 1.
    
Successfully parsed a group of options.
    
Parsing a group of options: input file abc_btr_1280x800_Takeover.mov.
    
Successfully parsed a group of options.
    
Opening an input file: abc_btr_1280x800_Takeover.mov.
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] ISO: File Type Major Brand: qt  
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] File position before avformat_find_stream_info() is 281624339
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] All info found
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000085ac00] File position after avformat_find_stream_info() is 288732
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'abc_btr_1280x800_Takeover.mov':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    creation_time   : 2013-09-22 02:50:18
    
  Duration: 00:00:10.00, start: 0.000000, bitrate: 225299 kb/s
    
    Stream #0:0(eng), 1, 1/24: Video: qtrle (rle  / 0x20656C72), bgra, 1280x800, 225293 kb/s, SAR 1280:1280 DAR 8:5, 24 fps, 24 tbr, 24 tbn, 24 tbc (default)
    
    Metadata:
    
      creation_time   : 2013-09-22 02:50:18
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 00:00:00:00
    
    Stream #0:1(eng), 0, 1/24: Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    
    Metadata:
    
      creation_time   : 2013-09-22 02:50:22
    
      handler_name    : Apple Alias Data Handler
    
      timecode        : 00:00:00:00
    
Successfully opened the file.
    
Parsing a group of options: output file test4.flv.
    
Applying option vcodec (force video codec ('copy' to copy stream)) with argument flv.
    
Applying option pix_fmt (set pixel format) with argument yuv444p.
    
Applying option s (set frame size (WxH or abbreviation)) with argument 1280x800.
    
Successfully parsed a group of options.
    
Opening an output file: test4.flv.
    
Successfully opened the file.
    
detected 4 logical cores
    
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'video_size' to value '1280x800'
    
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'pix_fmt' to value '30'
    
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'time_base' to value '1/24'
    
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'pixel_aspect' to value '1280/1280'
    
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'sws_param' to value 'flags=2'
    
[graph 0 input from stream 0:0 @ 0000000000303bc0] Setting 'frame_rate' to value '24/1'
    
[graph 0 input from stream 0:0 @ 0000000000303bc0] w:1280 h:800 pixfmt:bgra tb:1/24 fr:24/1 sar:1/1 sws_param:flags=2
    
[scaler for output stream 0:0 @ 00000000003056a0] Setting 'w' to value '1280'
    
[scaler for output stream 0:0 @ 00000000003056a0] Setting 'h' to value '800'
    
[scaler for output stream 0:0 @ 00000000003056a0] Setting 'flags' to value '0x4'
    
[scaler for output stream 0:0 @ 00000000003056a0] w:1280 h:800 flags:'0x4' interl:0
    
Incompatible pixel format 'yuv444p' for codec 'flv', auto-selecting format 'yuv420p'
    
[format @ 00000000002f8320] compat: called with args=[yuv420p]
    
[format @ 00000000002f8320] Setting 'pix_fmts' to value 'yuv420p'
    
[AVFilterGraph @ 000000000085bc60] query_formats: 5 queried, 4 merged, 0 already done, 0 delayed
    
[scaler for output stream 0:0 @ 00000000003056a0] w:1280 h:800 fmt:bgra sar:1/1 -> w:1280 h:800 fmt:yuv420p sar:1/1 flags:0x4
    
[flv @ 0000000000374be0] intra_quant_bias = 0 inter_quant_bias = -64
    
Output #0, flv, to 'test4.flv':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    encoder         : Lavf55.19.104
    
    Stream #0:0(eng), 0, 1/1000: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p,             1280x800 [SAR 1:1 DAR 8:5], q=2-31, 200 kb/s, 1k tbn, 24 tbc (default)
    
    Metadata:
    
      creation_time   : 2013-09-22 02:50:18
    
          handler_name    : Apple Alias Data Handler
    
          timecode        : 00:00:00:00        
    
    Stream mapping:
    
      Stream #0:0 -> #0:0 (qtrle -> flv)
    
Press [q] to stop, [?] for help
    
frame=   27 fps=0.0 q=31.0 size=     351kB time=00:00:01.12 bitrate=2554.2kbits/s    
    
frame=   46 fps= 45 q=31.0 size=     477kB time=00:00:01.91 bitrate=2039.5kbits/s    
    
frame=   60 fps= 39 q=31.0 size=     543kB time=00:00:02.50 bitrate=1779.4kbits/s    
    
frame=   74 fps= 36 q=31.0 size=     629kB time=00:00:03.08 bitrate=1672.4kbits/s    
    
frame=   96 fps= 37 q=31.0 size=     795kB time=00:00:04.00 bitrate=1627.4kbits/s    
    
frame=  123 fps= 40 q=31.0 size=     924kB time=00:00:05.12 bitrate=1477.0kbits/s    
    
frame=  149 fps= 41 q=31.0 size=    1133kB time=00:00:06.20 bitrate=1494.7kbits/s    
    
frame=  175 fps= 43 q=31.0 size=    1224kB time=00:00:07.29 bitrate=1375.5kbits/s    
    
frame=  201 fps= 44 q=31.0 size=    1352kB time=00:00:08.37 bitrate=1322.7kbits/s    
    
frame=  228 fps= 45 q=31.0 size=    1461kB time=00:00:09.50 bitrate=1260.1kbits/s    
    
[output stream 0:0 @ 00000000003053c0] EOF on sink link output stream 0:0:default.
    
No more output streams to write to, finishing.
    
frame=  240 fps= 45 q=31.0 Lsize=    1600kB time=00:00:10.00 bitrate=1310.4kbits/s    
    

    
video:1596kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.252476%
    
240 frames successfully decoded, 0 decoding errors
    
[AVIOContext @ 000000000032dfc0] Statistics: 3 seeks, 242 writeouts
    
[AVIOContext @ 000000000085bde0] Statistics: 281664506 bytes read, 3 seeks

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