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Autres articles (42)
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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 ;
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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 -
Les formats acceptés
28 janvier 2010, parLes commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
ffmpeg -codecs ffmpeg -formats
Les format videos acceptés en entrée
Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
Les formats vidéos de sortie possibles
Dans un premier temps on (...)
Sur d’autres sites (8417)
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Which is better for pixel-level analysis of television (TV) video, OpenCV or ffmpeg ? [closed]
5 décembre 2011, par Randall CookI need to do some pixel-level analysis of television (TV) video. I have used ffmpeg in the past for analyzing video from files, but it wasn't exactly easy. I am thinking of giving OpenCV a try. Any recommendations or advice ?
Let's assume that I am starting with an MPEG-2 transport stream, and the analysis needs to run in real-time on Linux. I was also planning on using Intel's IPP library for some of the number crunching.
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FFmpeg c++ how to get the timestamp, in seconds since epoch that a frame was taken at
29 août 2017, par Derek HaldenI’ve been looking around for this, and Can’t seem to find it. I have an RTSP stream that I am pulling from using ffmpeg. Objects at my disposal include an AVPacket, AVFrame, AVCodecContext, and an AVFormatContext . I would like to get the absolute time that a frame was taken at. (ideally with granularity as small as milliseconds, though that’s not completely necessary).
Is there an easy way to do this using the ffmpeg libraries ? I’ve looked at
av_frame_get_best_effort_timestamp
as well ascodec_context->time_base
, but that seems to give the answers in seconds since the beginning of the video, and I don’t necessarily know when the video started. -
FFMpeg set alpha channel transparent for black pixels
1er avril 2023, par PeteI'm using ffmpeg for a bunch of my video workflows. I need to learn how to replace the alpha channel for the black pixels to be transparent. The video I'm working with is ProRes 4444. Here is a link to a
Sample video file. It seems it should be easy but I'm having a hard time figuring out how to do it. Thanks in advance for helping !