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Autres articles (18)
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List of compatible distributions
26 avril 2011, parThe table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...) -
Automated installation script of MediaSPIP
25 avril 2011, parTo overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
The documentation of the use of this installation script is available here.
The code of this (...) -
Sélection de projets utilisant MediaSPIP
29 avril 2011, parLes 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 (4869)
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Multimedia Exploration Journal : The Past Doesn’t Die
12 juillet 2011, par Multimedia Mike — Game HackingNew haul of games, new (old) multimedia formats.
Lords of Midnight
Check out the box copy scan for Lords of Midnight in MobyGames. In particular, I’d like to call your attention to this little blurb :
Ahem, "Journey through an immense world — the equivalent of 8 CD-ROMs." Yet, when I procured the game, it only came on a single CD-ROM. It’s definitely a CD-ROM (says so on the disc) and, coming from 1995, certainly predates the earliest DVD-ROMs (which can easily store 8 CD-ROMs on a disc). Thus, I wanted to jump in a see if they were using some phenomenal compression in order to squeeze so much info into 600 or so megabytes.
I was surprised to see the contents of the disc clocking in at just under 40 megabytes. An intro movie and an outro movie account for 75% of that. Format ? None other than that curious ASCII anomaly, ARMovie/RPL with Escape 122 codec data.
Cyclemania
Cyclemania is one of those FMV backdrop action games, but with a motorcycle theme. I had a good feeling I would find some odd multimedia artifacts here and the game didn’t disappoint. The videos are apparently handled using 3-4 discrete files per animation. I’ve documented my cursory guesses and linked some samples at the new MultimediaWiki page.
Interplay ACMP
This is unrelated to this particular acquistion, but I was contacted today about audio files harvested from the 1993 DOS game Star Trek : Judgment Rites. The files begin with the ASCII signature "Interplay ACMP Data". This reminds me of Interplay MVE files which begin with the similar string "Interplay MVE File". My theory is that these files use the ACOMP compression format, though I’m still trying to make it fit.Wiki and samples are available as usual if you’d like to add your own research.
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Revision 37293 : Retour en arrière (suppression de la noisette)
15 avril 2010, par joseph@… — LogRetour en arrière (suppression de la noisette)
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Writing an MP4 file on the Mac with OpenCV ffmpeg
31 décembre 2020, par Sameer ParekhI am using OpenCV with ffmpeg on a mac to write video. I've been able to successfully write .avi files using the codec/fourcc code, FMP4. I would like to write .mp4 files, however. When I try to write an .mp4 file using fourcc FMP4 I get this error :



[mp4 @ 0x100b4ec00] Tag FMP4/0x34504d46 incompatible with output codec id '13' ( [0][0][0])



When I use AVC1 I get the following error :



[libx264 @ 0x104003000] broken ffmpeg default settings detected
[libx264 @ 0x104003000] use an encoding preset (e.g. -vpre medium)
[libx264 @ 0x104003000] preset usage: -vpre <speed> -vpre <profile>
[libx264 @ 0x104003000] speed presets are listed in x264 --help
[libx264 @ 0x104003000] profile is optional; x264 defaults to high
Could not open codec 'libx264': Unspecified error
</profile></speed>


Does anyone here know the right codec to use with OpenCV and ffmpeg to write to an MP4 container on the Mac ?



If AVC1 is the right codec, how do I install ffmpeg + OpenCV correctly ? I did



brew install gpac
brew install ffmpeg
brew install opencv



The call I am using to open the videowriter :



fourcc = cv2.cv.CV_FOURCC('A', 'V', 'C', '1') 
video_out = cv2.VideoWriter(
 filename=output_filename,
 fourcc=fourcc,
 fps=video_fps,
 frameSize=(video_width,video_height),
 isColor=1)



When I run
x264 --helpI get


% x264 --help
x264 core:125
Syntax: x264 [options] -o outfile infile

Infile can be raw (in which case resolution is required),
 or YUV4MPEG (*.y4m),
 or Avisynth if compiled with support (no).
 or libav* formats if compiled with lavf support (no) or ffms support (no).
Outfile type is selected by filename:
 .264 -> Raw bytestream
 .mkv -> Matroska
 .flv -> Flash Video
 .mp4 -> MP4 if compiled with GPAC support (no)
Output bit depth: 8 (configured at compile time)

Options:

 -h, --help List basic options
 --longhelp List more options
 --fullhelp List all options

Example usage:

 Constant quality mode:
 x264 --crf 24 -o <output> <input />

 Two-pass with a bitrate of 1000kbps:
 x264 --pass 1 --bitrate 1000 -o <output> <input />
 x264 --pass 2 --bitrate 1000 -o <output> <input />

 Lossless:
 x264 --qp 0 -o <output> <input />

 Maximum PSNR at the cost of speed and visual quality:
 x264 --preset placebo --tune psnr -o <output> <input />

 Constant bitrate at 1000kbps with a 2 second-buffer:
 x264 --vbv-bufsize 2000 --bitrate 1000 -o <output> <input />

Presets:

 --profile <string> Force the limits of an H.264 profile
 Overrides all settings.
 - baseline,main,high,high10,high422,high444
 --preset <string> Use a preset to select encoding settings [medium]
 Overridden by user settings.
 - ultrafast,superfast,veryfast,faster,fast
 - medium,slow,slower,veryslow,placebo
 --tune <string> Tune the settings for a particular type of source
 or situation
 Overridden by user settings.
 Multiple tunings are separated by commas.
 Only one psy tuning can be used at a time.
 - psy tunings: film,animation,grain,
 stillimage,psnr,ssim
 - other tunings: fastdecode,zerolatency

Frame-type options:

 -I, --keyint <integer or="or"> Maximum GOP size [250]
 --tff Enable interlaced mode (top field first)
 --bff Enable interlaced mode (bottom field first)
 --pulldown <string> Use soft pulldown to change frame rate
 - none, 22, 32, 64, double, triple, euro (requires cfr input)

Ratecontrol:

 -B, --bitrate <integer> Set bitrate (kbit/s)
 --crf <float> Quality-based VBR (0-51) [23.0]
 --vbv-maxrate <integer> Max local bitrate (kbit/s) [0]
 --vbv-bufsize <integer> Set size of the VBV buffer (kbit) [0]
 -p, --pass <integer> Enable multipass ratecontrol
 - 1: First pass, creates stats file
 - 2: Last pass, does not overwrite stats file

Input/Output:

 -o, --output <string> Specify output file
 --sar width:height Specify Sample Aspect Ratio
 --fps Specify framerate
 --seek <integer> First frame to encode
 --frames <integer> Maximum number of frames to encode
 --level <string> Specify level (as defined by Annex A)
 --quiet Quiet Mode

Filtering:

 --vf, --video-filter <filter0>/<filter1>/... Apply video filtering to the input file

 Filter options may be specified in <filter>:<option>=<value> format.

 Available filters:
 crop:left,top,right,bottom
 select_every:step,offset1[,...]
</value></option></filter></filter1></filter0></string></integer></integer></string></integer></integer></integer></float></integer></string></integer></string></string></string></output></output></output></output></output></output>


Thanks,
-s


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