
Recherche avancée
Autres articles (59)
-
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. -
Publier sur MédiaSpip
13 juin 2013Puis-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 -
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 ;
Sur d’autres sites (10215)
-
Trouble with the ffmpeg -ss flag when capturing one frame from a Macbook iSight webcam
1er mars 2014, par AndyFor about five years I've used ffmpeg in a shell script to grab one frame from my linux'd-up Macbook's iSight :
ffmpeg -f video4linux2 -s 640x480 -r 15 -i /dev/video0 -an -vframes 1 -vcodec mjpeg -y -sameq -ss 1.5 snapshot.jpg
I just upgraded my Ubuntu distro from Lucid to Natty (ffmpeg ver. 0.6.2-4:0.6.2-1ubuntu1).
Now that syntax turns the iSight on but hangs indefinitely.[output snipped, ending with:]
frame= 0 fps= 0 q=0.0 Lsize= -0kB time=10000000000.00 bitrate= -0.0kbits/s
video:0kB audio:0kB global headers:0kB muxing overhead -inf%Without the '-ss' flag it seems to successfully grab the first frame and exit immediately - the only difference in output being :
frame= 1 fps= 0 q=0.0 Lsize= -0kB time=0.07 bitrate= -2.6kbits/s
video:16kB audio:0kB global headers:0kB muxing overhead -100.132730%However, the '-ss 1.5' was necessary to delay the frame capture by 1.5 seconds to allow the cam sufficient time to adjust the exposure.
The -itsoffset flag seemed promising, but doesn't seem to change ffmpeg's behavior (ie doesn't hang, but no delay).
Any ideas ?
-
Revision f872a98b1b : Adds speed 8 to vp9 as reference Adds a speed 8 to VP9 where only the nearestmv
28 février 2014, par Deb MukherjeeChanged Paths :
Modify /vp9/encoder/vp9_encodeframe.c
Modify /vp9/encoder/vp9_onyx_if.c
Modify /vp9/encoder/vp9_onyx_int.h
Modify /vp9/encoder/vp9_pickmode.c
Modify /vp9/encoder/vp9_rdopt.c
Adds speed 8 to vp9 as referenceAdds a speed 8 to VP9 where only the nearestmv (0 mv) is searched.
This seems to be about the same speed as vp8 speed 5.Adds a new speed feature to disable inter modes based on a mask for
each blocksize.Adds code for having lower complexity motion search methods
in nonrd pick mode function, even though speed 7 still uses DIAMOND
search for now.Also uses HEX search for speed 6 rather than FAST_HEX which improves
psnr by 0.56% without any noticeable speed drop (tested on gipsmotion).Change-Id : Ic13176572dbd3aed5884a26786940a4b1bbd8a75
-
Revision 9c63e887e6 : cost_coefs approximation speed up This patch adds a new speed feature which doe
3 mars 2014, par Jim BankoskiChanged Paths :
Modify /vp9/encoder/vp9_onyx_if.c
Modify /vp9/encoder/vp9_onyx_int.h
Modify /vp9/encoder/vp9_rdopt.c
cost_coefs approximation speed upThis patch adds a new speed feature which doesn't do the rather
expensive entropy context lookup or save to the table, while
doing costing.The speed up on desktop36p.y4m is around 10% other clips much less.
On the RTC test set this was + 1% in overall datarate.
Change-Id : Ia5144bbf45270671e7be9c8e4055369909e2f738