
Recherche avancée
Autres articles (55)
-
Les statuts des instances de mutualisation
13 mars 2010, parPour des raisons de compatibilité générale du plugin de gestion de mutualisations avec les fonctions originales de SPIP, les statuts des instances sont les mêmes que pour tout autre objets (articles...), seuls leurs noms dans l’interface change quelque peu.
Les différents statuts possibles sont : prepa (demandé) qui correspond à une instance demandée par un utilisateur. Si le site a déjà été créé par le passé, il est passé en mode désactivé. publie (validé) qui correspond à une instance validée par un (...) -
Creating farms of unique websites
13 avril 2011, parMediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...) -
Librairies et binaires spécifiques au traitement vidéo et sonore
31 janvier 2010, parLes logiciels et librairies suivantes sont utilisées par SPIPmotion d’une manière ou d’une autre.
Binaires obligatoires FFMpeg : encodeur principal, permet de transcoder presque tous les types de fichiers vidéo et sonores dans les formats lisibles sur Internet. CF ce tutoriel pour son installation ; Oggz-tools : outils d’inspection de fichiers ogg ; Mediainfo : récupération d’informations depuis la plupart des formats vidéos et sonores ;
Binaires complémentaires et facultatifs flvtool2 : (...)
Sur d’autres sites (4400)
-
watermark image get rotated on video using ffmpeg- android
24 avril 2017, par Pratik DeogadeI am trying to add water mark on my video in android, i am successfull in adding it but the problem is water image get rotated by 90 degree clock wise
here is my command
String[] complexCommand = "ffmpeg","-y" ,"-i", "/sdcard/Vid.mp4","-strict","experimental", "-vf", "movie=/sdcard/watermarka.png [watermark] ; [in][watermark] overlay=main_w-overlay_w-10:10 [out]","-s", "320x2400","-r", "30", "-b", "15496k", "-vcodec", "mpeg4","-ab", "48000", "-ac", "2", "-ar", "22050", "/sdcard/out.mp4" ;
-
h264 RTP timestamp
26 octobre 2024, par user269090I have a confusion about the timestamp of h264 RTP packet. I know the wall clock rate of video is 90KHz which I defined in the SIP SDP. The frame rate of my encoder is not exactly 30 FPS, it is variable. It varies from 15 FPS to 30 FPS on the fly. So, I cannot use any fixed timestamp.



Could any one tell me the timestamp of the following encoded packet.

After 0 milisecond encoded RTP timestamp = 0 (Let the starting timestamp 0)

After 50 milisecond encoded RTP timestamp = ?

After 40 milisecond encoded RTP timestamp = ?

After 33 milisecond encoded RTP timestamp = ?


What is the formula when the encoded frame rate is variable ?



Thank you in advance.


-
How to use fig.show=animate in knitr without administrator privileges
23 mai 2013, par Stéphane LaurentI use Windows without administrator privileges hence I cannot set a path in the Windows PATH variable.
The
ffmpeg.exe
file is in my"U:/ProgramFiles/ImageMagick-6.8.5-5/"
folder.I have found how to use the
saveVideo()
function of theanimate
package :ani.options(ffmpeg = shQuote('U:/ProgramFiles/ImageMagick-6.8.5-5/ffmpeg.exe'))
saveVideo({
par(mar = rep(3, 4))
for (i in seq(pi/2, -4/3 * pi, length = 12)) {
plot(0, 0, pch = 20, ann = FALSE, axes = FALSE)
arrows(0, 0, cos(i), sin(i))
axis(1, 0, "VI"); axis(2, 0, "IX")
axis(3, 0, "XII"); axis(4, 0, "III"); box()
}
},
video.name="mavideo.mp4",
outdir="U:/Data/Rtests/Animation")But I haven't find how to knit a Rmd file with the option
fig.show=animate
in a chunk, for instance :```{r clock, fig.width=7, fig.height=6, fig.show='animate'}
par(mar = rep(3, 4))
for (i in seq(pi/2, -4/3 * pi, length = 12)) {
plot(0, 0, pch = 20, ann = FALSE, axes = FALSE)
arrows(0, 0, cos(i), sin(i))
axis(1, 0, "VI"); axis(2, 0, "IX")
axis(3, 0, "XII"); axis(4, 0, "III"); box()
}
```I have tried to modifiy the
hook_ffmpeg_html()
function by only changing theffmpeg.cmd
variable :```{r}
hook_ffmpeg_html2 <- function (x, options)
{
........
ffmpeg.cmd = paste("-y", "-r", 1/options$interval,
"-i", fig.fname, mov.fname)
ffmpeg.cmd <- paste('"U:/ProgramFiles/ImageMagick-6.8.5-5/ffmpeg"', ffmpeg.cmd)
......
}
opts_knit$set(animation.fun = hook_ffmpeg_html2)
```But this chunk does not work, below is the error message :
label: unnamed-chunk-1
Warning in block_exec(params) :
failed to tidy R code in chunk
reason: Error in base::parse(text = text, srcfile = NULL) :
21:14: unexpected symbol
20: options$out.height), if ("controls" %in% mov.opts)
21: "controls=\\"controls