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Autres articles (28)

  • La file d’attente de SPIPmotion

    28 novembre 2010, par

    Une file d’attente stockée dans la base de donnée
    Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
    Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...)

  • 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

  • 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 (4394)

  • Merge commit ’56f98e340fca894a76d1ddbe33118b8d8c4db34a’

    26 juillet 2014, par Michael Niedermayer
    Merge commit ’56f98e340fca894a76d1ddbe33118b8d8c4db34a’

    * commit ’56f98e340fca894a76d1ddbe33118b8d8c4db34a’ :
    
  output example : convert audio to the format supported by the encoder
    

    Conflicts :
    
	doc/examples/muxing.c
    

    Not merged as our example code already does that for what is needed
    
and we generate matching data for the rest. generating fixed data
    
and converting all parameters could be done of course.
    

    Merged-by : Michael Niedermayer <michaelni@gmx.at>

  • Revision cd228fcdb8 : Add an early termination check in handle_inter_mode Check the mode and motion v

    27 août 2014, par Jingning Han

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



    Add an early termination check in handle_inter_mode

    Check the mode and motion vector cost. If it is already above
    the existing best rate-distortion cost, skip the rest check process
    on this mode.

    Change-Id : Ie065cebdfda2a3be3be18b8e8b43dc29aaa8c179

  • Maintaining exact aspect ratio when scaling videos using ffmpeg

    31 mai 2012, par Skkard

    I have a mkv video, which is a mix of multiple resolution recordings, e.g. I have the first few seconds of widescreen 16:9 (1024x576) resolution, and the rest of the video if 4:3 (768x576) resolution. I want to scale this video down 3 times, while copying all the other attributes (audio codec, subtitles etc.). I use ffmpeg -i  -vf scale=iw/2:-1 -acodec copy . Also, VLC detects it's resolution as 720x576.

    The problem is that after the scaling, the resolution constantly becomes 4:3 (360x288). How can I maintain the dynamic aspect ratio of the input video file i.e. the 16:9 parts to scale to 16:9, while the 4:3 parts scale to 4:3 ?

    update

    The player size actually changes, atleast in mplayer, when the resolution is switched. I figured out the main problem. It seems each frame is tagged with a Sample Aspect Ratio (SAR), so when the player plays it, it can find the display aspect ratio. This SAR value isn't getting copied over when encoding to MKV. When encoding to MPG, it does get copied over and I get an exact copy, with the player switching sizes, but not with MKV.

    Output of ffprobe -show_streams filename :

    ffprobe version 0.10.3 Copyright (c) 2007-2012 the FFmpeg developers
    
  built on May  9 2012 17:51:07 with gcc 4.7.0 20120505 (prerelease)
    
  configuration: --prefix=/usr --enable-libmp3lame --enable-libvorbis --enable-libxvid --enable-libx264 --enable-libvpx --enable-libtheora --enable-libgsm --enable-libspeex --enable-postproc --enable-shared --enable-x11grab --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libschroedinger --enable-libopenjpeg --enable-librtmp --enable-libpulse --enable-gpl --enable-version3 --enable-runtime-cpudetect --disable-debug --disable-static
    
  libavutil      51. 35.100 / 51. 35.100
    
  libavcodec     53. 61.100 / 53. 61.100
    
  libavformat    53. 32.100 / 53. 32.100
    
  libavdevice    53.  4.100 / 53.  4.100
    
  libavfilter     2. 61.100 /  2. 61.100
    
  libswscale      2.  1.100 /  2.  1.100
    
  libswresample   0.  6.100 /  0.  6.100
    
  libpostproc    52.  0.100 / 52.  0.100
    
Input #0, matroska,webm, from &#39;sample.mkv&#39;:
    
  Metadata:
    
    title           : Pan prstenu. Dve veze
    
  Duration: 00:00:29.80, start: 0.000000, bitrate: 3124 kb/s
    
    Stream #0:0(eng): Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45 DAR 16:9], 15000 kb/s, 25 fps, 25 tbr, 1k tbn, 50 tbc (default)
    
    Stream #0:1(cze): Audio: mp2, 48000 Hz, stereo, s16, 128 kb/s (default)
    
[STREAM]
    
index=0
    
codec_name=mpeg2video
    
codec_long_name=MPEG-2 video
    
codec_type=video
    
codec_time_base=1/50
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
width=720
    
height=576
    
has_b_frames=1
    
sample_aspect_ratio=64:45
    
display_aspect_ratio=16:9
    
pix_fmt=yuv420p
    
level=8
    
timecode=16:35:19:10
    
id=N/A
    
r_frame_rate=25/1
    
avg_frame_rate=25/1
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
nb_frames=N/A
    
TAG:language=eng
    
[/STREAM]
    
[STREAM]
    
index=1
    
codec_name=mp2
    
codec_long_name=MP2 (MPEG audio layer 2)
    
codec_type=audio
    
codec_time_base=1/48000
    
codec_tag_string=[0][0][0][0]
    
codec_tag=0x0000
    
sample_fmt=s16
    
sample_rate=48000
    
channels=2
    
bits_per_sample=0
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=125/3
    
time_base=1/1000
    
start_time=0.000000
    
duration=N/A
    
nb_frames=N/A
    
TAG:language=cze
    
[/STREAM]

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