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Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
Autres articles (80)
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Les autorisations surchargées par les plugins
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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 -
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Sur d’autres sites (9161)
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How to stream frames from ffmpeg to a process ?
7 mars, par VoracI would like to encrypt camera frames before transmitting. For that purpose the encrypting process needs to get the raw frames through some mode of IPC. I tried reading through the steaming API docs but got lost. This is an "what approach" question instead of a "working solution" one.


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How to specify the GPU to be used by nvenc in ffmpeg [closed]
25 septembre 2022, par GioI'm using compiled ffmpeg executable for transcoding mpegts stream from h264 to h265 with nvenc. I have two nvidia Graphics Cards installed on my motherboard : GeForce GTX 690 and Tesla k-10. Is there any codec specific parameters for nvenc to choose the GPU I want to encode with ?


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ffmpeg encode single input to multiple outputs simultaneously
23 août 2019, par jippyjoe4Suppose I have a single input file that I would like to transcode into two different formats (ProRes and Mp4). Individually, the two commands I would use look like this :
To convert it to mp4, I would use :
ffmpeg -i in.mov -c:v libx264 -x264-params "nal-hrd=cbr" -b:v 30M -minrate 30M -maxrate 30M -bufsize 60M "out.mp4"
And to convert it to ProRes, I would use :
ffmpeg -i in.mov -c:v prores_ks -profile:v 2 -bits_per_mb 540 -vendor apl0 -pix_fmt yuv422p10le "out.mov"
Rather than running these two commands sequentially to do the conversion, I think ffmpeg can encode to both formats simultaneously and save time. I’ve read this page (https://trac.ffmpeg.org/wiki/Creating%20multiple%20outputs), but I find it confusing. I tried something along the lines of :
ffmpeg -i "in.mov" \
-c:v libx264 -x264-params "nal-hrd=cbr" -b:v 30M -minrate 30M -maxrate 30M -bufsize 60M "out.mp4" \
-c:v prores_ks -profile:v 2 -bits_per_mb 540 -vendor apl0 -pix_fmt yuv422p10le "out.mov"But attempting to run this just gives me the error :
Unable to find a suitable output format for '\
I don’t quite understand what’s going wrong. How can I encode my single input to both outputs simultaneously ?