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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 (...)

  • Contribute to translation

    13 avril 2011

    You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
    To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
    MediaSPIP is currently available in French and English (...)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

Sur d’autres sites (7059)

  • Why ffmpeg command results in blank video ?

    17 juillet 2013, par kheya

    I am trying to conver mov file to H264 encoded mp4
    Same command converts another mov file just fine.

    But fails for a particular mov file. Original video is 29.6MB after conversion I get 966KB

    I get the sound and duration right. But all the frames are black even though original video is fine.

    Here is the command :

    ffmpeg -i file3.mov -movflags +faststart -vcodec libx264 -preset slow -crf 20 -vf -threads 0 -acodec libvo_aacenc -b:a 128k "file3.mp4"

    Here is the result of ffmpeg -i : >ffmpeg.exe -i file3.mov

    ffmpeg version N-54691-g7f4a1fd Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Jul 12 2013 16:31:48 with gcc 4.7.3 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
    
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
    
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
    
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
    
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
    
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
    
eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
    
amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
    
enable-libxvid --enable-zlib
    
  libavutil      52. 39.100 / 52. 39.100
    
  libavcodec     55. 18.102 / 55. 18.102
    
  libavformat    55. 12.102 / 55. 12.102
    
  libavdevice    55.  3.100 / 55.  3.100
    
  libavfilter     3. 80.101 /  3. 80.101
    
  libswscale      2.  3.100 /  2.  3.100
    
  libswresample   0. 17.102 /  0. 17.102
    
  libpostproc    52.  3.100 / 52.  3.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 00000000003077e0] sample aspect ratio already set to
    
118:81, ignoring 'pasp' atom (10000:7031)
    
Guessed Channel Layout for  Input Stream #0.1 : stereo
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file3.mov':
    
  Metadata:
    
    creation_time   : 2009-02-12 01:19:22
    
  Duration: 00:00:08.00, start: 0.000000, bitrate: 30338 kb/s
    
    Stream #0:0(eng): Video: dvvideo (dvpp / 0x70707664), yuv411p, 720x576 [SAR
    
64:45 DAR 16:9], 28800 kb/s, SAR 118:81 DAR 295:162, 25 fps, 25 tbr, 600 tbn, 25
    
 tbc
    
    Metadata:
    
      creation_time   : 2009-02-12 01:19:22
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, stereo, s1
    
6, 1536 kb/s
    
    Metadata:
    
      creation_time   : 2009-02-12 01:19:22
    
      handler_name    : Apple Alias Data Handler

    During conversion here is what I see (nothing unusual or no errors) :

    ffmpeg version N-54691-g7f4a1fd Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Jul 12 2013 16:31:48 with gcc 4.7.3 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
    
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
    
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
    
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
    
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
    
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
    
eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
    
amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
    
enable-libxvid --enable-zlib
    
  libavutil      52. 39.100 / 52. 39.100
    
  libavcodec     55. 18.102 / 55. 18.102
    
  libavformat    55. 12.102 / 55. 12.102
    
  libavdevice    55.  3.100 / 55.  3.100
    
  libavfilter     3. 80.101 /  3. 80.101
    
  libswscale      2.  3.100 /  2.  3.100
    
  libswresample   0. 17.102 /  0. 17.102
    
  libpostproc    52.  3.100 / 52.  3.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 00000000024aafe0] sample aspect ratio already set to
    
118:81, ignoring 'pasp' atom (10000:7031)
    
Guessed Channel Layout for  Input Stream #0.1 : stereo
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file3.mov':
    
  Metadata:
    
    creation_time   : 2009-02-12 01:19:22
    
  Duration: 00:00:08.00, start: 0.000000, bitrate: 30338 kb/s
    
    Stream #0:0(eng): Video: dvvideo (dvpp / 0x70707664), yuv411p, 720x576 [SAR
    
64:45 DAR 16:9], 28800 kb/s, SAR 118:81 DAR 295:162, 25 fps, 25 tbr, 600 tbn, 25
    
 tbc
    
    Metadata:
    
      creation_time   : 2009-02-12 01:19:22
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, stereo, s1
    
6, 1536 kb/s
    
    Metadata:
    
      creation_time   : 2009-02-12 01:19:22
    
      handler_name    : Apple Alias Data Handler
    
No pixel format specified, yuv422p for H.264 encoding chosen.
    
Use -pix_fmt yuv420p for compatibility with outdated media players.
    
[libx264 @ 0000000000347340] using SAR=118/81
    
[libx264 @ 0000000000347340] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
    
AVX
    
[libx264 @ 0000000000347340] profile High 4:2:2, level 2.1, 4:2:2 8-bit
    
[libx264 @ 0000000000347340] 264 - core 133 r2334 a3ac64b - H.264/MPEG-4 AVC cod
    
ec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 r
    
ef=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed
    
_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pski
    
p=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 deci
    
mate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_
    
adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=2
    
5 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=20.0 qcomp=0.6
    
0 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
Output #0, mp4, to 'file4a.mp4':
    
  Metadata:
    
    encoder         : Lavf55.12.102
    
    Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 4
    
80x320 [SAR 118:81 DAR 59:27], q=-1--1, 12800 tbn, 25 tbc
    
    Metadata:
    
      creation_time   : 2009-02-12 01:19:22
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:1(eng): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 48000
    
Hz, stereo, s16, 128 kb/s
    
    Metadata:
    
      creation_time   : 2009-02-12 01:19:22
    
      handler_name    : Apple Alias Data Handler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (dvvideo -> libx264)
    
  Stream #0:1 -> #0:1 (pcm_s16be -> libvo_aacenc)
    
Press [q] to stop, [?] for help
    
[swscaler @ 00000000024b0740] Warning: data is not aligned! This can lead to a s
    
peedloss
    
frame=   78 fps=0.0 q=25.0 size=     128kB time=00:00:02.14 bitrate= 487.8kbits/
    
frame=  113 fps=109 q=25.0 size=     272kB time=00:00:04.27 bitrate= 520.9kbits/
    
frame=  145 fps= 94 q=25.0 size=     399kB time=00:00:05.36 bitrate= 609.2kbits/
    
frame=  182 fps= 89 q=25.0 size=     571kB time=00:00:06.45 bitrate= 725.0kbits/
    
Starting second pass: moving header on top of the file
    
frame=  200 fps= 70 q=-1.0 Lsize=     965kB time=00:00:08.00 bitrate= 987.2kbits
    
/s
    
video:832kB audio:126kB subtitle:0 global headers:0kB muxing overhead 0.755121%
    
[libx264 @ 0000000000347340] frame I:1     Avg QP:21.14  size: 39885
    
[libx264 @ 0000000000347340] frame P:50    Avg QP:21.80  size:  7412
    
[libx264 @ 0000000000347340] frame B:149   Avg QP:26.25  size:  2960
    
[libx264 @ 0000000000347340] consecutive B-frames:  0.5%  0.0%  1.5% 98.0%
    
[libx264 @ 0000000000347340] mb I  I16..4: 13.7% 46.7% 39.7%
    
[libx264 @ 0000000000347340] mb P  I16..4:  0.5% 19.7%  3.8%  P16..4: 32.8% 11.9
    
% 14.1%  0.0%  0.0%    skip:17.1%
    
[libx264 @ 0000000000347340] mb B  I16..4:  0.0%  5.1%  1.3%  B16..8: 14.4%  9.2
    
%  2.9%  direct: 7.3%  skip:59.8%  L0:42.8% L1:38.3% BI:19.0%
    
[libx264 @ 0000000000347340] 8x8 transform intra:79.4% inter:71.7%
    
[libx264 @ 0000000000347340] direct mvs  spatial:97.3% temporal:2.7%
    
[libx264 @ 0000000000347340] coded y,uvDC,uvAC intra: 92.8% 80.1% 26.3% inter: 2
    
4.2% 28.8% 8.1%
    
[libx264 @ 0000000000347340] i16 v,h,dc,p: 64% 17%  3% 16%
    
[libx264 @ 0000000000347340] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  1% 33%  4%  3%  8%
    
 2% 35%  2% 11%
    
[libx264 @ 0000000000347340] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  3% 23%  5%  4% 11%
    
 5% 33%  4% 13%
    
[libx264 @ 0000000000347340] i8c dc,h,v,p: 38% 40% 14%  8%
    
[libx264 @ 0000000000347340] Weighted P-Frames: Y:2.0% UV:0.0%
    
[libx264 @ 0000000000347340] ref P L0: 39.9% 10.0% 25.6%  8.7% 15.3%  0.6%
    
[libx264 @ 0000000000347340] ref B L0: 76.9% 15.1%  5.7%  2.3%
    
[libx264 @ 0000000000347340] ref B L1: 96.3%  3.7%
    
[libx264 @ 0000000000347340] kb/s:851.49

  • Revision c725502bf3 : Skip buffer update in sub8x8 rd loop This commit allows the encoder to skip a f

    20 juillet 2013, par Jingning Han

    Changed Paths :
     Modify /vp9/encoder/vp9_rdopt.c



    Skip buffer update in sub8x8 rd loop

    This commit allows the encoder to skip a few buffer update steps in
    rd_pick_best_mbsegmentation, when early breakout has been triggered
    in the rd_check_segment_txsize. It provides about 1% speed-up for
    bus_cif at 2000 kbps, in the settings of speed 0.

    Change-Id : Ica034f10a24dec572b397d8389a2b81020ebc0b9

  • Revision 325e0aa650 : Special handle on DC only inverse 8x8 2D-DCT This commit enables a special hand

    26 juillet 2013, par Jingning Han

    Changed Paths :
     Modify /vp9/common/vp9_idct.c


     Modify /vp9/common/vp9_rtcd_defs.sh


     Modify /vp9/common/x86/vp9_idct_intrin_sse2.c


     Modify /vp9/decoder/vp9_idct_blk.c


     Modify /vp9/encoder/vp9_encodemb.c



    Special handle on DC only inverse 8x8 2D-DCT

    This commit enables a special handle for the 8x8 inverse 2D-DCT,
    where only DC coefficient is quantized to be non-zero. For bus_cif
    at 2000 kbps, it provides about 1% speed-up at speed 0.

    Change-Id : I2523222359eec26b144cf8fd4c63a4ad63b1b011

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