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Autres articles (18)
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Encoding and processing into web-friendly formats
13 avril 2011, parMediaSPIP automatically converts uploaded files to internet-compatible formats.
Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
All uploaded files are stored online in their original format, so you can (...) -
Demande de création d’un canal
12 mars 2010, parEn fonction de la configuration de la plateforme, l’utilisateur peu avoir à sa disposition deux méthodes différentes de demande de création de canal. La première est au moment de son inscription, la seconde, après son inscription en remplissant un formulaire de demande.
Les deux manières demandent les mêmes choses fonctionnent à peu près de la même manière, le futur utilisateur doit remplir une série de champ de formulaire permettant tout d’abord aux administrateurs d’avoir des informations quant à (...) -
Installation en mode ferme
4 février 2011, parLe mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
C’est la méthode que nous utilisons sur cette même plateforme.
L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...)
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Detect if FFmpeg is running or has stopped running
21 février 2013, par asprinI'm using C to scan a directory which contains frames extracted by ffmpeg. Now in the event that the last file is reached during the scan, I need to check for two conditions :
- It's the last file as the video duration is over.
- It's the last file as ffmpeg terminated abruptly and is no longer able to populate the directory
My C program workflow is like :
while(<there exists="exists" files="files" in="in" the="the" directory="directory">)
{
// iterate over them and do something with each frame
}
// coming out of the loop means no more files available...so I need a if condition
if(<check if="if" ffmpeg="ffmpeg" is="is" stopped="stopped">) // <-- need to know what to put inside the condition
{
// start it again
}
else
{
// video is over, nothing more left to do
}
</check></there>I'm thinking I can do this using
Process ID
of ffmpeg, but how would I get that info ? Any other alternative way of checking ifffpmeg
has stopped ?Some metadata
OS : Windows 7
IDE : Dev C++
Language Used : C -
FFMPEG compression - Piping vs File [on hold]
27 avril 2014, par raajGood Day,
I have written an application that uses the V4L2 driver to capture H264 Raw frames from a C920. The bytes are output into stdout, and can be piped to a file or any program
What I am trying to do is this :
./capture | ffmpeg -f h264 -i - -b 500000 -vcodec copy out.mp4
The idea is to capture a raw video and convert it to an mp4 file on the fly. It works perfectly, however, the bit rate compression is never applied. It ends up with a file the same size as the raw file (since the camera outputs a compressed h264 file but in raw frames already)
However, if I was to do this instead
./cature > input.raw
ffmpeg -i out.mp4 -b 500000 output.mp4
Now, it compresses the file down to a reasonable size. Is there a reason for this ? My only current solution right now is to use an alternative like gstreamer (which has issues with h264) or to figure out the ffmpeg API and see if I can add some code to make it do compression on the frames on the fly.
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avformat/mov : sanity check STSD entries
6 février 2021, par Michael Niedermayeravformat/mov : sanity check STSD entries
The choosen value is arbitrary. I am not sure if this is a good idea
but i dont immedeately see an alternative better way, it seems either
an arbitrary limit or OOMFixes : OOM
Fixes : 27492/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6194970578649088Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>