Recherche avancée

Médias (0)

Mot : - Tags -/metadatas

Aucun média correspondant à vos critères n’est disponible sur le site.

Autres articles (22)

  • 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" (...)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

Sur d’autres sites (5696)

  • What is wrong with the following ffmpeg command

    14 août 2013, par Brad

    What is wrong with the following ffmpeg command. Originally this had -sameq instead of the -qscale:a 0

    Command :

    ffmpeg -loglevel debug -threads 4 -i sample-in.mpg -ss 00:00:01 -t 00:00:05 -f image2 -y sample-frames/frame%d.png -acodec copy -qscale:a 0  -y sample.mp3

    Output
    

    
ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Jul  9 2013 04:36:42 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=cc --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-ffplay
    
  libavutil      52. 18.100 / 52. 18.100
    
  libavcodec     54. 92.100 / 54. 92.100
    
  libavformat    54. 63.104 / 54. 63.104
    
  libavdevice    54.  3.103 / 54.  3.103
    
  libavfilter     3. 42.103 /  3. 42.103
    
  libswscale      2.  2.100 /  2.  2.100
    
  libswresample   0. 17.102 /  0. 17.102
    
  libpostproc    52.  2.100 / 52.  2.100
    

    
Splitting the commandline.
    
Reading option '-loglevel' ... matched as option 'loglevel' (set libav* logging level) with argument 'debug'.
    
Reading option '-threads' ... matched as AVOption 'threads' with argument '4'.
    
Reading option '-i' ... matched as input file with argument 'sample-in.mpg'.
    
Reading option '-ss' ... matched as option 'ss' (set the start time offset) with argument '00:00:01'.
    
Reading option '-t' ... matched as option 't' (record or transcode "duration" seconds of audio/video) with argument '00:00:05'.
    
Reading option '-f' ... matched as option 'f' (force format) with argument 'image2'.
    
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
    
Reading option 'sample-frames/frame%d.png' ... matched as output file.
    
Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'copy'.
    
Reading option '-qscale:a' ... matched as option 'qscale' (use fixed quality scale (VBR)) with argument '0'.
    
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
    
Reading option 'sample.mp3' ... matched as output file.
    
Finished splitting the commandline.
    
Parsing a group of options: global .
    
Applying option loglevel (set libav* logging level) with argument debug.
    
Applying option y (overwrite output files) with argument 1.
    
    Last message repeated 1 times
    
Successfully parsed a group of options.
    
Parsing a group of options: input file sample-in.mpg.
    
Successfully parsed a group of options.
    
Opening an input file: sample-in.mpg.
    
[mpeg @ 0x7ffb4a80f200] Format mpeg probed with size=16384 and score=52
    
[mpeg @ 0x7ffb4a80f200] File position before avformat_find_stream_info() is 0
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2500
    
[mpeg @ 0x7ffb4a80f200] Probe with size=2002, packets=1 detected mpegvideo with score=25
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2499
    
[mpeg @ 0x7ffb4a80f200] Probe with size=4043, packets=2 detected mpegvideo with score=25
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2498
    
[mpeg @ 0x7ffb4a80f200] Probe with size=6084, packets=3 detected mpegvideo with score=25
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2497
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2496
    
[mpeg @ 0x7ffb4a80f200] Probe with size=10166, packets=5 detected mpegvideo with score=25
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2495
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2494
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2493
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2492
    
[mpeg @ 0x7ffb4a80f200] Probe with size=18330, packets=9 detected mpegvideo with score=25
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2491
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2490
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2489
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2488
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2487
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2486
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2485
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2484
    
[mpeg @ 0x7ffb4a80f200] Probe with size=34658, packets=17 detected mpegvideo with score=25
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2483
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2482
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2481
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2480
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2479
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2478
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2477
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2476
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2475
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2474
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2473
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2472
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2471
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2470
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2469
    
[mpeg @ 0x7ffb4a80f200] probing stream 0 pp:2468
    
[mpeg @ 0x7ffb4a80f200] Probe with size=67266, packets=33 detected mpegvideo with score=51
    
[mpeg @ 0x7ffb4a80f200] probed stream 0
    
[mpeg @ 0x7ffb4a80f200] first_dts 86997 not matching first dts 93003 in the queue
    
    Last message repeated 3 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 86997 not matching first dts 108018 in the queue
    
    Last message repeated 3 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 111600 in the queue
    
    Last message repeated 9 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 135360 in the queue
    
    Last message repeated 8 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 156960 in the queue
    
    Last message repeated 9 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 180720 in the queue
    
    Last message repeated 8 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 202320 in the queue
    
    Last message repeated 9 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 226080 in the queue
    
    Last message repeated 8 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 247680 in the queue
    
    Last message repeated 9 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 271440 in the queue
    
    Last message repeated 9 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 295200 in the queue
    
    Last message repeated 8 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 316800 in the queue
    
    Last message repeated 9 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 340560 in the queue
    
    Last message repeated 8 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 362160 in the queue
    
    Last message repeated 9 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 385920 in the queue
    
    Last message repeated 8 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 407520 in the queue
    
    Last message repeated 9 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 431280 in the queue
    
    Last message repeated 8 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 452880 in the queue
    
    Last message repeated 9 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 476640 in the queue
    
    Last message repeated 8 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 498240 in the queue
    
    Last message repeated 9 times
    
[mpeg @ 0x7ffb4a80f200] first_dts 90000 not matching first dts 522000 in the queue
    
    Last message repeated 9 times
    
[mpeg @ 0x7ffb4a80f200] max_analyze_duration 5000000 reached at 5005000 microseconds
    
[mpeg @ 0x7ffb4a80f200] File position after avformat_find_stream_info() is 0
    
Input #0, mpeg, from 'sample-in.mpg':
    
  Duration: 00:00:05.97, start: 1.000000, bitrate: 6827 kb/s
    
    Stream #0:0[0x1e0], 152, 1/90000: Video: mpeg1video, yuv420p, 704x480 [SAR 200:219 DAR 880:657], 1001/30000, 104857 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc
    
    Stream #0:1[0x1c0], 211, 1/90000: Audio: mp2, 48000 Hz, stereo, s16p, 64 kb/s
    
Successfully opened the file.
    
Parsing a group of options: output file sample-frames/frame%d.png.
    
Applying option ss (set the start time offset) with argument 00:00:01.
    
Applying option t (record or transcode "duration" seconds of audio/video) with argument 00:00:05.
    
Applying option f (force format) with argument image2.
    
Successfully parsed a group of options.
    
Opening an output file: sample-frames/frame%d.png.
    
Successfully opened the file.
    
Parsing a group of options: output file sample.mp3.
    
Applying option acodec (force audio codec ('copy' to copy stream)) with argument copy.
    
Applying option qscale:a (use fixed quality scale (VBR)) with argument 0.
    
Successfully parsed a group of options.
    
Opening an output file: sample.mp3.
    
Successfully opened the file.
    
[buffer @ 0x7ffb4a411e40] Setting entry with key 'video_size' to value '704x480'
    
[buffer @ 0x7ffb4a411e40] Setting entry with key 'pix_fmt' to value '0'
    
[buffer @ 0x7ffb4a411e40] Setting entry with key 'time_base' to value '1/90000'
    
[buffer @ 0x7ffb4a411e40] Setting entry with key 'pixel_aspect' to value '200/219'
    
[buffer @ 0x7ffb4a411e40] Setting entry with key 'sws_param' to value 'flags=2'
    
[buffer @ 0x7ffb4a411e40] Setting entry with key 'frame_rate' to value '30000/1001'
    
[graph 0 input from stream 0:0 @ 0x7ffb4a411de0] w:704 h:480 pixfmt:yuv420p tb:1/90000 fr:30000/1001 sar:200/219 sws_param:flags=2
    
[scale @ 0x7ffb4a414800] Setting 'w' to value '0'
    
[scale @ 0x7ffb4a414800] Setting 'h' to value '0'
    
[scale @ 0x7ffb4a414800] Setting 'flags' to value '0x4'
    
[auto-inserted scaler 0 @ 0x7ffb4a414740] w:0 h:0 flags:'0x4' interl:0
    
[format @ 0x7ffb4a42aa20] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
    
[auto-inserted scaler 0 @ 0x7ffb4a414740] picking rgb24 out of 7 ref:yuv420p alpha:0
    
[auto-inserted scaler 0 @ 0x7ffb4a414740] w:704 h:480 fmt:yuv420p sar:200/219 -> w:704 h:480 fmt:rgb24 sar:200/219 flags:0x4
    
[png @ 0x7ffb4a831000] detected 4 logical cores
    
[mp3 @ 0x7ffb4a831600] Invalid audio stream. Exactly one MP3 audio stream is required.
    
Output #0, image2, to 'sample-frames/frame%d.png':
    
  Metadata:
    
    encoder         : Lavf54.63.104
    
    Stream #0:0, 0, 1/90000: Video: png, rgb24, 704x480 [SAR 200:219 DAR 880:657], 1001/30000, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
    
Output #1, mp3, to 'sample.mp3':
    
  Metadata:
    
    encoder         : Lavf54.63.104
    
    Stream #1:0, 0, 1/90000: Audio: mp2, 48000 Hz, stereo, 64 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg1video -> png)
    
  Stream #0:1 -> #1:0 (copy)
    
Could not write header for output file #1 (incorrect codec parameters ?): Invalid argument
    
Statistics: 4542608 bytes read, 2 seeks

    I found the code above from : http://kwlug.org/node/854
    I did a few edits removing the -sameq and replacing it with -qscale:a 0 which probably is wrong.

  • Revision 49b6302044 : SSE2 4x4 invserse ADST/DCT transform Enable SSE2 4x4 inverse ADST/DCT transform

    10 juillet 2013, par Jingning Han

    Changed Paths :
     Modify /vp9/common/vp9_rtcd_defs.sh


     Modify /vp9/common/x86/vp9_idct_intrin_sse2.c



    SSE2 4x4 invserse ADST/DCT transform

    Enable SSE2 4x4 inverse ADST/DCT transform. The runtime goes from
    292 cycles down to 89 cycles. Running bus_cif at 2000 kbps, the
    overall runtime of speed 0 goes from 301s to 295s (2% speed-up).

    Change-Id : I24098136e7fee7ab2fbf1c11755bdf2ca37f3628

  • Revision 91365addf8 : SSE2 8x8 inverse ADST/DCT transform This commit enables SSE2 implementation of

    13 juillet 2013, par Jingning Han

    Changed Paths :
     Modify /vp9/common/vp9_rtcd_defs.sh


     Modify /vp9/common/x86/vp9_idct_intrin_sse2.c



    SSE2 8x8 inverse ADST/DCT transform

    This commit enables SSE2 implementation of 8x8 inverse ADST/DCT
    transform. The runtime goes from 1216 cycles -> 266 cycles.
    For bus_cif at 2000 kbps, the overall runtime reduces from
    253707ms -> 248430ms, i.e., 2% speed-up at speed 0.

    Change-Id : Ib0372e17e9162d7b11a10d653b1c8be547c878fb

Navigation