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La conservation du net art au musée. Les stratégies à l’œuvre
26 mai 2011
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (38)
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Personnaliser en ajoutant son logo, sa bannière ou son image de fond
5 septembre 2013, parCertains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;
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Ecrire une actualité
21 juin 2013, parPrésentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
Vous pouvez personnaliser le formulaire de création d’une actualité.
Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...) -
Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
Sur d’autres sites (5657)
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Writing an MP4 file on the Mac with OpenCV ffmpeg
13 janvier 2015, 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 opencvThe 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 -
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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Revision 30713 : Grosses modifications ... nécessite de refaire la configuration
8 août 2009, par kent1@… — LogGrosses modifications ... nécessite de refaire la configuration
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