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Granite de l’Aber Ildut
9 septembre 2011, par
Mis à jour : Septembre 2011
Langue : français
Type : Texte
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Géodiversité
9 septembre 2011, par ,
Mis à jour : Août 2018
Langue : français
Type : Texte
Autres articles (34)
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Qualité du média après traitement
21 juin 2013, parLe bon réglage du logiciel qui traite les média est important pour un équilibre entre les partis ( bande passante de l’hébergeur, qualité du média pour le rédacteur et le visiteur, accessibilité pour le visiteur ). Comment régler la qualité de son média ?
Plus la qualité du média est importante, plus la bande passante sera utilisée. Le visiteur avec une connexion internet à petit débit devra attendre plus longtemps. Inversement plus, la qualité du média est pauvre et donc le média devient dégradé voire (...) -
Des sites réalisés avec MediaSPIP
2 mai 2011, parCette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page. -
Gestion des droits de création et d’édition des objets
8 février 2011, parPar défaut, beaucoup de fonctionnalités sont limitées aux administrateurs mais restent configurables indépendamment pour modifier leur statut minimal d’utilisation notamment : la rédaction de contenus sur le site modifiables dans la gestion des templates de formulaires ; l’ajout de notes aux articles ; l’ajout de légendes et d’annotations sur les images ;
Sur d’autres sites (5116)
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Change AVI creation date with ffmpeg ?
1er novembre 2016, par brockAs far as I can tell the following ffmpeg command should copy all existing metadata in the input file to the output file and modify the specified field in the output file :
ffmpeg -i VID_20130502_220104.avi -metadata creation_time="2013-05-02 22:01:04" -codec copy VID_20130502_220104-2.aviInstead, it seems to strip all metadata from the output file. Here is the output of a few commands. I am going nuts. I think this should work, but why is it not ?
Command to edit the creation time :
ffmpeg -i VID_20130502_220104.avi -metadata creation_time="2013-05-02 22:01:04" -codec copy VID_20130502_220104-2.avi
ffmpeg version 3.1.5 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.4.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
libavutil 55. 28.100 / 55. 28.100
libavcodec 57. 48.101 / 57. 48.101
libavformat 57. 41.100 / 57. 41.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 47.100 / 6. 47.100
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 1.100 / 2. 1.100
libpostproc 54. 0.100 / 54. 0.100
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, avi, from 'VID_20130502_220104.avi':
Metadata:
encoder :
maker : NIKON
model : COOLPIX S4300
creation_time : 2011-01-01 00:00:00
Duration: 00:01:30.50, start: 0.000000, bitrate: 32135 kb/s
Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 31782 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, 1 channels, s16, 352 kb/s
[avi @ 000000000032ad40] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
Last message repeated 1 times
Output #0, avi, to 'VID_20130502_220104-2.avi':
Metadata:
creation_time : 2013-05-02 22:01:04
maker : NIKON
model : COOLPIX S4300
ISFT : Lavf57.41.100
Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, q=2-31, 31782 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, 352 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 891 fps=0.0 q=-1.0 size= 116171kB time=00:00:29.69 bitrate=32043.1kbits/s speed=59.4x
frame= 1739 fps=1739 q=-1.0 size= 227191kB time=00:00:57.96 bitrate=32107.5kbits/s speed= 58x
frame= 2609 fps=1739 q=-1.0 size= 340940kB time=00:01:26.96 bitrate=32115.9kbits/s speed= 58x
frame= 2715 fps=1734 q=-1.0 Lsize= 355018kB time=00:01:30.49 bitrate=32136.3kbits/s speed=57.8x
video:350984kB audio:3897kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.038597%Command to inspect the output file metadata with ffmpeg :
ffmpeg -i VID_20130502_220104-2.avi
ffmpeg version 3.1.5 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.4.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
libavutil 55. 28.100 / 55. 28.100
libavcodec 57. 48.101 / 57. 48.101
libavformat 57. 41.100 / 57. 41.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 47.100 / 6. 47.100
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 1.100 / 2. 1.100
libpostproc 54. 0.100 / 54. 0.100
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, avi, from 'VID_20130502_220104-2.avi':
Metadata:
encoder : Lavf57.41.100
Duration: 00:01:30.50, start: 0.000000, bitrate: 32136 kb/s
Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 31782 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, 1 channels, s16, 352 kb/s
At least one output file must be specifiedCommand to inspect the input file metadata with exiftool :
exiftool.exe VID_20130502_220104.avi
ExifTool Version Number : 10.30
File Name : VID_20130502_220104.avi
Directory : .
File Size : 347 MB
File Modification Date/Time : 2013:05:13 16:33:52-04:00
File Access Date/Time : 2015:11:10 23:08:25-05:00
File Creation Date/Time : 2015:11:10 23:08:25-05:00
File Permissions : rw-rw-rw-
File Type : AVI
File Type Extension : avi
MIME Type : video/x-msvideo
Frame Rate : 30
Max Data Rate : 488.3 kB/s
Frame Count : 2715
Stream Count : 2
Stream Type : Video
Video Codec : mjpg
Video Frame Rate : 30
Video Frame Count : 2715
Quality : 10000
Sample Size : Variable
Image Width : 1280
Image Height : 720
Planes : 1
Bit Depth : 24
Compression : MJPG
Image Length : 2764800
Pixels Per Meter X : 0
Pixels Per Meter Y : 0
Num Colors : Use BitDepth
Num Important Colors : All
Audio Codec :
Audio Sample Rate : 22050
Audio Sample Count : 1995256
Encoding : Microsoft PCM
Num Channels : 1
Sample Rate : 22050
Avg Bytes Per Sec : 44100
Bits Per Sample : 16
Maker Note Type : NIKON
Maker Note Version : 0.1.0.0
Make : NIKON
Model : COOLPIX S4300
Software : V1.0
Equipment : NIKON DIGITAL CAMERA
Orientation : Horizontal (normal)
Exposure Time : 1/15
F Number : 3.5
Exposure Compensation : 0
Max Aperture Value : 3.2
Metering Mode : Multi-segment
Focal Length : 4.6 mm
X Resolution : 72
Y Resolution : 72
Resolution Unit : inches
Date/Time Original : 2011:01:01 00:00:00
Create Date : 2011:01:01 00:00:00
Focus Mode : AF-S
Digital Zoom : 1
Color Mode : COLOR
Sharpness : AUTO
White Balance : NORMAL
Noise Reduction : OFF
Thumbnail Image : (Binary data 3082 bytes, use -b option to extract)
Aperture : 3.5
Duration : 0:01:30
Image Size : 1280x720
Megapixels : 0.922
Shutter Speed : 1/15
Focal Length : 4.6 mmCommand to inspect the output file metadata with exiftool :
exiftool.exe VID_20130502_220104-2.avi
ExifTool Version Number : 10.30
File Name : VID_20130502_220104-2.avi
Directory : .
File Size : 347 MB
File Modification Date/Time : 2016:11:01 00:17:38-04:00
File Access Date/Time : 2016:11:01 00:17:36-04:00
File Creation Date/Time : 2016:11:01 00:15:18-04:00
File Permissions : rw-rw-rw-
File Type : AVI
File Type Extension : avi
MIME Type : video/x-msvideo
Frame Rate : 30
Max Data Rate : 3923 kB/s
Frame Count : 2715
Stream Count : 2
Stream Type : Video
Video Codec : MJPG
Video Frame Rate : 30
Video Frame Count : 2715
Quality : Default
Sample Size : Variable
Image Width : 1280
Image Height : 720
Planes : 1
Bit Depth : 24
Compression : MJPG
Image Length : 2764800
Pixels Per Meter X : 0
Pixels Per Meter Y : 0
Num Colors : Use BitDepth
Num Important Colors : All
Audio Codec : .
Audio Sample Rate : 22050
Audio Sample Count : 1995256
Encoding : Microsoft PCM
Num Channels : 1
Sample Rate : 22050
Avg Bytes Per Sec : 44100
Bits Per Sample : 16
Software : Lavf57.41.100
Duration : 0:01:30
Image Size : 1280x720
Megapixels : 0.922 -
Revision 8d3d2b76f3 : Tx size selection enhancements (1) Refines the modeling function and uses that
22 juin 2013, par Deb MukherjeeChanged Paths :
Modify /vp9/common/vp9_blockd.h
Modify /vp9/encoder/vp9_encodeframe.c
Modify /vp9/encoder/vp9_onyx_if.c
Modify /vp9/encoder/vp9_onyx_int.h
Modify /vp9/encoder/vp9_rdopt.c
Tx size selection enhancements(1) Refines the modeling function and uses that to add some speed
features. Specifically, intead of using a flag use_largest_txfm as
a speed feature, an enum tx_size_search_method is used, of which
two of the types are USE_FULL_RD and USE_LARGESTALL. Two other
new types are added :
USE_LARGESTINTRA (use largest only for intra)
USE_LARGESTINTRA_MODELINTER (use largest for intra, and model for
inter)(2) Another change is that the framework for deciding transform type
is simplified to use a heuristic count based method rather than
an rd based method using txfm_cache. In practice the new method
is found to work just as well - with derf only -0.01 down.
The new method is more compatible with the new framework where
certain rd costs are based on full rd and certain others are
based on modeled rd or are not computed. In this patch the existing
rd based method is still kept for use in the USE_FULL_RD mode.
In the other modes, the count based method is used.
However the recommendation is to remove it eventually since the
benefit is limited, and will remove a lot of complications in
the code(3) Finally a bug is fixed with the existing use_largest_txfm speed feature
that causes mismatches when the lossless mode and 4x4 WH transform is
forced.Results on derf :
USE_FULL_RD : +0.03% (due to change in the tables), 0% encode time reduction
USE_LARGESTINTRA : -0.21%, 15% encode time reduction (this one is a
pretty good compromise)
USE_LARGESTINTRA_MODELINTER : -0.98%, 22% encode time reduction
(currently the benefit of modeling is limited for txfm size selection,
but keeping this enum as a placeholder) .
USE_LARGESTALL : -1.05%, 27% encode-time reduction (same as existing
use_largest_txfm speed feature).Change-Id : I4d60a5f9ce78fbc90cddf2f97ed91d8bc0d4f936
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FFmpeg hardware acceleration on Raspberry PI
17 février 2017, par Cristian GaborI am building a program that use ffmpeg to stream webcam content over internet. I would like to know if it is possible to use the GPU for the streaming part on the raspberry pi model 3. If yes, how could I implement this on ffmpeg ?
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