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SWFUpload Process
6 septembre 2011, par
Mis à jour : Septembre 2011
Langue : français
Type : Texte
Autres articles (36)
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Submit bugs and patches
13 avril 2011Unfortunately a software is never perfect.
If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
You may also (...) -
Other interesting software
13 avril 2011, parWe don’t claim to be the only ones doing what we do ... and especially not to assert claims to be the best either ... What we do, we just try to do it well and getting better ...
The following list represents softwares that tend to be more or less as MediaSPIP or that MediaSPIP tries more or less to do the same, whatever ...
We don’t know them, we didn’t try them, but you can take a peek.
Videopress
Website : http://videopress.com/
License : GNU/GPL v2
Source code : (...) -
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.
Sur d’autres sites (5596)
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Protecting consumer privacy : How to ensure CCPA compliance
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av::av_encode_video produces blurred video from crisp files
9 janvier 2023, par AbdirizakI am using the
av::av_encode_video()
function to produce a .mp4 video from png files, as in this answer. I pay special attention for the png files to be perfectly crisp, i.e. I plot matrices to png with exactly the same dimensions, so that every matrix cell maps to one cell in the png. Here is code to illustrate what I mean :

library(av)

n.times <- 24*10
n.row <- 50
n.col <- 26

out.dir <- "/Users/Abdirizak/Documents/some/directory/"

for (i in 1:n.times) {
 
 current.mat <- matrix(data = rnorm(n.row*n.col), nrow = n.row, ncol = n.col)
 
 setwd(out.dir)
 png(filename = paste0(i, ".png"), width = n.row, height = n.col)
 
 par(mar = rep(0,4))
 image(current.mat)
 
 dev.off()
 
}

setwd(out.dir)
png.files <- paste0(out.dir, list.files(pattern = ".png$"))

av::av_encode_video(input = png.files, output = "000.mp4", framerate = 24)



Now, even though my input .png files are perfectly crisp, the output .mp4 video is blurry. How can I prevent that from happening ? I.e. how can I get a perfectly crisp video ? (I am aware that this will likely inflate the file size of the .mp4 file)


I already digged a bit into the
vfilter
argument ofav_encode_video()
and the underlying ffmpeg filter graphs on here, but could not yet really get the hang on it.

I am looking at the .mp4 file through QuickTime Player on MacOS Ventura 13.0.1, and using R version 4.2.2 through RStudio 2022.12.0.353


Edit 9.1.2023 :


To further clarify, here is an example screenshot of a png image (not the original png file because that one appears too small here) :




As I said, a perfectly crisp image.


On the other hand, a screenshot of the .mp4 movie looks like this :




Somewhat unsatisfactory. Any suggestions are welcome.


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Can't open ffmpeg output with quicktime, pix_fmt flag doesn't fix it
13 novembre 2019, par kilojoulesQuicktime can’t read the output of
ffmpeg
when I try making an animation. It uploads to imgur and plays no problem. A previous thread recommended that I add the-pix_fmt yuv420p
flag. But, on my system, that does not work.ffmpeg
runs without error when I exclude thepix_fmt
flag, but I cannot open the output animation in quicktime.Why won’t quicktime open the animation ? How can I make the animation open with quicktime ?
$ ffmpeg -y -i animation/tigers_${ii}_%05d.png -pix_fmt yuv420p tiger${ii}.mp4
ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
libavutil 56. 14.100 / 56. 14.100
libavcodec 58. 18.100 / 58. 18.100
libavformat 58. 12.100 / 58. 12.100
libavdevice 58. 3.100 / 58. 3.100
libavfilter 7. 16.100 / 7. 16.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 1.100 / 5. 1.100
libswresample 3. 1.100 / 3. 1.100
libpostproc 55. 1.100 / 55. 1.100
Input #0, image2, from 'animation/tigers_1.10_%05d.png':
Duration: 00:00:08.32, start: 0.000000, bitrate: N/A
Stream #0:0: Video: png, rgba(pc), 2023x3036 [SAR 17716:17716 DAR 2023:3036], 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x7fdd7b800c00] width not divisible by 2 (2023x3036)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!