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  • L’espace de configuration de MediaSPIP

    29 novembre 2010, par

    L’espace de configuration de MediaSPIP est réservé aux administrateurs. Un lien de menu "administrer" est généralement affiché en haut de la page [1].
    Il permet de configurer finement votre site.
    La navigation de cet espace de configuration est divisé en trois parties : la configuration générale du site qui permet notamment de modifier : les informations principales concernant le site (...)

  • Déploiements possibles

    31 janvier 2010, par

    Deux types de déploiements sont envisageable dépendant de deux aspects : La méthode d’installation envisagée (en standalone ou en ferme) ; Le nombre d’encodages journaliers et la fréquentation envisagés ;
    L’encodage de vidéos est un processus lourd consommant énormément de ressources système (CPU et RAM), il est nécessaire de prendre tout cela en considération. Ce système n’est donc possible que sur un ou plusieurs serveurs dédiés.
    Version mono serveur
    La version mono serveur consiste à n’utiliser qu’une (...)

  • Sélection de projets utilisant MediaSPIP

    29 avril 2011, par

    Les exemples cités ci-dessous sont des éléments représentatifs d’usages spécifiques de MediaSPIP pour certains projets.
    Vous pensez avoir un site "remarquable" réalisé avec MediaSPIP ? Faites le nous savoir ici.
    Ferme MediaSPIP @ Infini
    L’Association Infini développe des activités d’accueil, de point d’accès internet, de formation, de conduite de projets innovants dans le domaine des Technologies de l’Information et de la Communication, et l’hébergement de sites. Elle joue en la matière un rôle unique (...)

Sur d’autres sites (4510)

  • swresample : add exact_rational option

    12 juin 2016, par Muhammad Faiz
    swresample : add exact_rational option

    give high quality resampling
    
as good as with linear_interp=on
    
as fast as without linear_interp=on
    
tested visually with ffplay
    
ffplay -f lavfi "aevalsrc=’sin(10000*t*t)’, aresample=osr=48000, showcqt=gamma=5"
    
ffplay -f lavfi "aevalsrc=’sin(10000*t*t)’, aresample=osr=48000:linear_interp=on, showcqt=gamma=5"
    
ffplay -f lavfi "aevalsrc=’sin(10000*t*t)’, aresample=osr=48000:exact_rational=on, showcqt=gamma=5"
    

    slightly speed improvement
    
for fair comparison with -cpuflags 0
    
audio.wav is 1 hour 44100 stereo 16bit wav file
    
ffmpeg -i audio.wav -af aresample=osr=48000 -f null -
    
        old         new
    
real    13.498s     13.121s
    
user    13.364s     12.987s
    
sys      0.131s      0.129s
    

    linear_interp=on
    
        old         new
    
real    23.035s     23.050s
    
user    22.907s     22.917s
    
sys      0.119s     0.125s
    

    exact_rational=on
    
real    12.418s
    
user    12.298s
    
sys      0.114s
    

    possibility to decrease memory usage if soft compensation is ignored
    

    Signed-off-by : Muhammad Faiz <mfcc64@gmail.com>
    • [DH] libswresample/arm/resample_init.c
    • [DH] libswresample/options.c
    • [DH] libswresample/resample.c
    • [DH] libswresample/resample.h
    • [DH] libswresample/resample_template.c
    • [DH] libswresample/soxr_resample.c
    • [DH] libswresample/swresample.c
    • [DH] libswresample/swresample_internal.h
    • [DH] libswresample/version.h
    • [DH] libswresample/x86/resample_init.c

  • Problems transcoding GoToMeeting output using FFmpeg

    20 avril 2014, par user3466413

    I’m having a nightmare of a time transcoding output from GoToMeeting, recorded using the latest OS X version, to something web-playable. No matter what settings I use, I end up with time syncing problems, at least with this particular recording.

    The .mov file looks like this. Note that it’s variable framerate, and because it’s mostly just a screencast of a PowerPoint presentation with occasional mouse movement, the output should be VFR too to produce a small file yet still preserve occasional motion.

    $ ffmpeg -i original.mov
    
ffmpeg version N-58273-g18df75f Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Nov 19 2013 10:34:42 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
    
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libass --enable-libcelt --enable-libfaac --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-openssl --enable-libopus --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --prefix=/usr/local
    
  libavutil      52. 53.100 / 52. 53.100
    
  libavcodec     55. 43.101 / 55. 43.101
    
  libavformat    55. 21.100 / 55. 21.100
    
  libavdevice    55.  5.100 / 55.  5.100
    
  libavfilter     3. 91.100 /  3. 91.100
    
  libswscale      2.  5.101 /  2.  5.101
    
  libswresample   0. 17.104 /  0. 17.104
    
  libpostproc    52.  3.100 / 52.  3.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f822980a000] decoding for stream 0 failed
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'original.mov':
    
  Metadata:
    
    major_brand     : qt
    
    minor_version   : 537199360
    
    compatible_brands: qt
    
    creation_time   : 2014-03-20 02:09:22
    
  Duration: 03:08:26.72, start: 0.000000, bitrate: 75 kb/s
    
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 1368x728 [SAR 1:1 DAR 171:91], 20 kb/s, 0.60 fps, 600 tbr, 600 tbn, 1200 tbc (default)
    
    Metadata:
    
      creation_time   : 2014-03-20 02:09:22
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 16000 Hz, mono, fltp, 47 kb/s (default)
    
    Metadata:
    
      creation_time   : 2014-03-20 02:09:22
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:2(eng): Data: none (rtp  / 0x20707472), 6 kb/s
    
    Metadata:
    
      creation_time   : 2014-03-20 02:09:22
    
      handler_name    : Apple Alias Data Handler
    
    Stream #0:3(und): Data: none (rtp  / 0x20707472), 0 kb/s
    
    Metadata:
    
      creation_time   : 2014-03-20 02:09:22
    
      handler_name    : Apple Alias Data Handler

    The .mov file (which I unfortunately cannot publicly post) plays back properly in any application I use : VLC, Media Player Classic, and QuickTime. However, playing the transcoded output always exhibits the following symptoms :

    • Audio out of sync with what the video is showing, sometimes to the order of minutes off towards the end of this three hour recording
    • In the case of Media Player Classic, clicking a spot on the timeline actually moves the playhead to a spot on the timeline near where I clicked, but not directly on it.

    There are the arguments I’m using for a .mp4 encoding that is playable in all browsers that support H.264. Note that this is on Windows but Linux exhibits the same problems.

    ffmpeg.exe -y -i original.mov -i watermark.png -filter_complex "[0:v] crop=1184:720:178:6,scale=1184:720,setsar=1/1; [0:v][1:v] overlay=1242:648 [0:v]" -vcodec libx264 -acodec libvo_aacenc -q:a 80 -crf 30 -ac 1 -ar 16000 -strict -2 -profile:v baseline -level 3 outout.mkv

    The arguments, other than those that are self-explanatory or trivial :

    • -filter_complex : Crop excess letterboxing/pillarboxing from the video and set the aspect ratio to 1:1 for square pixels (something Safari needed), then overlay a watermark from a PNG and resize the output to 720p
    • -crf 30 : encode the video at constant quality, variable bitrate
    • -ac 1 -ar 16000 : encode with mono audio at 16 KHz
    • -strict -2 -profile:v baseline -level 3 : encode using FFmpeg’s "experimental" H.264 encoder using the Baseline level 3 profile for web compatibility

    Note that yes, this goes to an MKV container initially because, for some reason, encoding directly to a .mp4 container hangs FFmpeg. I then use -acodec copy -vcodec copy to copy the audio and video streams directly into a .mp4 container. Finally I pass the output through MP4Box to interleave it so it can be progressively downloaded.

    When transcoding, FFmpeg does drop frames, which I suspect is related to the problem, with output like this :

    FFmpeg: frame=  232 fps= 26 q=24.0 size=    5983kB time=00:32:44.57 bitrate=  24.9kbits/s dup=0 drop=1487

    When I then later attempt to mux it into the .mp4 container from this temporary .mkv container, I get a flood of warnings like this :

    [mp4 @ 0297cd00] Non-monotonous DTS in output stream 0:0; previous: 6341306, current: 6007024; changing to 6341307. This may result in incorrect timestamps in the output file.

    Now I wouldn’t be surprised if there is indeed some problem with the source file. However, if so, I need to definitively prove just how it’s broken.

    Any thoughts ?

  • FFMPEG command to crop and transpose video comes out zoomed in bad quality

    15 juillet 2015, par Brian

    I’m trying to convert an mp4 video with dimensions usually 960x720 into a sqaure 480:480 video but it comes out looking squished usually, the command is

    "-y -i %s -vf crop=480:480,transpose=%d -threads 5 -metadata:s:v rotate=0 -c:v libx264 -crf 27 -preset ultrafast -c:a copy -bsf:a aac_adtstoasc %s";

    Am I missing something, do I need to down scale first or something ?

    **EDIT adding full console output. The ffmpeg command is updated, but the goal still remains the same, take an arbitrary video and square crop it

    07-14 22:30:32.813: D/ffmpeg(30354): -y -i /data/data/com.myapp.app/cache:temp/i7h4ajm0nim1mbcnrqotvrhhsc.mp4 -vf scale=iw*sar:ih,transpose=1 -threads 5 -metadata:s:v rotate=0 -c:v libx264 -crf 27 -preset ultrafast -c:a copy -bsf:a aac_adtstoasc -aspect 1:1 /data/data/com.myapp.app/cache:temp/p1t3bhs0oa3lpqa67g5i9ninm9.ts
    
07-14 22:30:32.903: D/ffmpeg(30354): new time reamining 9283
    
07-14 22:30:32.913: D/FFmpeg(30354): Running publishing updates method
    
07-14 22:30:35.963: D/ffmpeg(30354): WARNING: linker: /data/data/com.myapp.app/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
    
07-14 22:30:35.963: D/ffmpeg(30354): ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
    
07-14 22:30:35.963: D/ffmpeg(30354):   built on Jun  3 2015 21:56:01 with gcc 4.8 (GCC)
    
07-14 22:30:35.963: D/ffmpeg(30354):   configuration: --target-os=linux --cross-prefix=/Users/Brian1/development/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/Users/Brian1/development/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-small --enable-libx264 --enable-pthreads --disable-muxers --enable-muxer=mpegts --enable-muxer=mp4 --disable-demuxers --enable-demuxer=mpegts --enable-demuxer=mov --enable-demuxer=mpeg --enable-demuxer=mp4 --disable-debug --disable-decoders --enable-decoder=h264 --enable-decoder=aac --disable-devices --disable-encoders --enable-encoder=libx264 --disable-network --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/Users/Brian1/development/ffmpeg-android/ffmpeg-pkg-config --prefix=/Users/Brian1/development/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/Users/Brian1/development/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/Users/Brian1/development/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs=-lm --extra-cxxflags=
    
07-14 22:30:35.963: D/ffmpeg(30354):   libavutil      54.  7.100 / 54.  7.100
    
07-14 22:30:35.963: D/ffmpeg(30354):   libavcodec     56.  1.100 / 56.  1.100
    
07-14 22:30:35.963: D/ffmpeg(30354):   libavformat    56.  4.101 / 56.  4.101
    
07-14 22:30:35.963: D/ffmpeg(30354):   libavdevice    56.  0.100 / 56.  0.100
    
07-14 22:30:35.963: D/ffmpeg(30354):   libavfilter     5.  1.100 /  5.  1.100
    
07-14 22:30:35.963: D/ffmpeg(30354):   libswscale      3.  0.100 /  3.  0.100
    
07-14 22:30:35.963: D/ffmpeg(30354):   libswresample   1.  1.100 /  1.  1.100
    
07-14 22:30:35.963: D/ffmpeg(30354):   libpostproc    53.  0.100 / 53.  0.100
    
07-14 22:30:35.963: D/ffmpeg(30354): Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/data/com.myapp.app/cache:temp/i7h4ajm0nim1mbcnrqotvrhhsc.mp4':
    
07-14 22:30:35.963: D/ffmpeg(30354):   Metadata:
    
07-14 22:30:35.963: D/ffmpeg(30354):     major_brand     : mp42
    
07-14 22:30:35.963: D/ffmpeg(30354):     minor_version   : 0
    
07-14 22:30:35.963: D/ffmpeg(30354):     compatible_brands: isommp42
    
07-14 22:30:35.963: D/ffmpeg(30354):     creation_time   : 2015-07-15 05:30:32
    
07-14 22:30:35.963: D/ffmpeg(30354):   Duration: 00:00:02.75, start: 0.000000, bitrate: 9315 kb/s
    
07-14 22:30:35.963: D/ffmpeg(30354):     Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 960x720, 10062 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
    
07-14 22:30:35.963: D/ffmpeg(30354):     Metadata:
    
07-14 22:30:35.963: D/ffmpeg(30354):       rotate          : 90
    
07-14 22:30:35.963: D/ffmpeg(30354):       creation_time   : 2015-07-15 05:30:32
    
07-14 22:30:35.963: D/ffmpeg(30354):       handler_name    : VideoHandle
    
07-14 22:30:35.963: D/ffmpeg(30354):     Side data:
    
07-14 22:30:35.963: D/ffmpeg(30354):       displaymatrix: rotation of -90.00 degrees
    
07-14 22:30:35.963: D/ffmpeg(30354):     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 151 kb/s (default)
    
07-14 22:30:35.963: D/ffmpeg(30354):     Metadata:
    
07-14 22:30:35.963: D/ffmpeg(30354):       creation_time   : 2015-07-15 05:30:32
    
07-14 22:30:35.963: D/ffmpeg(30354):       handler_name    : SoundHandle
    
07-14 22:30:35.963: D/ffmpeg(30354): [libx264 @ 0xb6808800] using SAR=4/3
    
07-14 22:30:35.963: D/ffmpeg(30354): [libx264 @ 0xb6808800] using cpu capabilities: none!
    
07-14 22:30:35.963: D/ffmpeg(30354): [libx264 @ 0xb6808800] profile Constrained Baseline, level 3.1
    
07-14 22:30:35.963: D/ffmpeg(30354): [adts @ 0xb685b000] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
    
07-14 22:30:35.963: D/ffmpeg(30354): Output #0, mpegts, to '/data/data/com.myapp.app/cache:temp/p1t3bhs0oa3lpqa67g5i9ninm9.ts':
    
07-14 22:30:35.963: D/ffmpeg(30354):   Metadata:
    
07-14 22:30:35.963: D/ffmpeg(30354):     major_brand     : mp42
    
07-14 22:30:35.963: D/ffmpeg(30354):     minor_version   : 0
    
07-14 22:30:35.963: D/ffmpeg(30354):     compatible_brands: isommp42
    
07-14 22:30:35.963: D/ffmpeg(30354):     encoder         : Lavf56.4.101
    
07-14 22:30:35.963: D/ffmpeg(30354):     Stream #0:0(eng): Video: h264 (libx264), yuv420p, 720x960 [SAR 4:3 DAR 1:1], q=-1--1, 29.97 fps, 90k tbn, 29.97 tbc (default)
    
07-14 22:30:35.963: D/ffmpeg(30354):     Metadata:
    
07-14 22:30:35.963: D/ffmpeg(30354):       handler_name    : VideoHandle
    
07-14 22:30:35.963: D/ffmpeg(30354):       creation_time   : 2015-07-15 05:30:32
    
07-14 22:30:35.963: D/ffmpeg(30354):       rotate          : 0
    
07-14 22:30:35.963: D/ffmpeg(30354):       encoder         : Lavc56.1.100 libx264
    
07-14 22:30:35.963: D/ffmpeg(30354):     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, 151 kb/s (default)
    
07-14 22:30:35.963: D/ffmpeg(30354):     Metadata:
    
07-14 22:30:35.963: D/ffmpeg(30354):       creation_time   : 2015-07-15 05:30:32
    
07-14 22:30:35.963: D/ffmpeg(30354):       handler_name    : SoundHandle
    
07-14 22:30:35.963: D/ffmpeg(30354): Stream mapping:
    
07-14 22:30:35.963: D/ffmpeg(30354):   Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
    
07-14 22:30:35.963: D/ffmpeg(30354):   Stream #0:1 -> #0:1 (copy)
    
07-14 22:30:35.963: D/ffmpeg(30354): Press [q] to stop, [?] for help
    
07-14 22:30:35.963: D/ffmpeg(30354): frame=   17 fps=0.0 q=27.0 size=       0kB time=00:00:00.36 bitrate=   0.0kbits/s    
    
07-14 22:30:35.963: D/ffmpeg(30354): frame=   33 fps= 32 q=27.0 size=     164kB time=00:00:01.15 bitrate=1163.1kbits/s    
    
07-14 22:30:35.963: D/ffmpeg(30354): frame=   46 fps= 30 q=29.0 size=     213kB time=00:00:01.33 b

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