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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 (111)
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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 (...) -
Contribute to translation
13 avril 2011You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
MediaSPIP is currently available in French and English (...) -
HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
For older browsers the Flowplayer flash fallback is used.
MediaSPIP allows for media playback on major mobile platforms with the above (...)
Sur d’autres sites (8613)
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SEO for Financial Services : The Ultimate Guide
26 juin 2024, par Erin -
ffmpeg to generate dash and HLS - best practise
8 septembre 2017, par LaborCLooking for the correct way to encode a given input video in multiple bitrates and then package it for dash and HLS. I thought this is a basic task, but for me it was quite a challenge. So the way I do it is as follows :
First I split my video (mp4) into video and audio (I encode the audio, because I need to make sure that the output codec is aac, which is a requirement for web I think).
ffmpeg -c:v copy -an video_na.mp4 -i source_input.mp4
ffmpeg -c:a aac -ac 2 -async 1 -vn audio.mp4 -i source_input.mp4Then I encode the video with the following commands :
ffmpeg.exe -i video_na.mp4 -an -c:v libx264 -crf 18 \
-preset fast -profile:v high -level 4.2 -b:v 2000k -minrate 2000k \
-maxrate 2000k -bufsize 4000k -g 96 -keyint_min 96 -sc_threshold 0 \
-filter:v "scale='trunc(oh*a/2)*2:576'" -movflags +faststart \
-pix_fmt yuv420p -threads 4 -f mp4 video-2000k.mp4
ffmpeg.exe -i video_na.mp4 -an -c:v libx264 -crf 18 \
-preset fast -profile:v high -level 4.2 -b:v 1500k -minrate 1500k \
-maxrate 1500k -bufsize 3000k -g 96 -keyint_min 96 -sc_threshold 0 \
-filter:v "scale='trunc(oh*a/2)*2:480'" -movflags +faststart \
-pix_fmt yuv420p -threads 4 -f mp4 video-1500k.mp4After that I fragment the videos (I used the parameter —timescale 10000 but then the result was out of sync).
Sidenote : the -g parameter is 4 times 24 (frames). this is important because the fragmentation is 4000 (4 seconds)mp4fragment --fragment-duration 4000 video-2000k.mp4 \
video-2000k-f.mp4
mp4fragment --fragment-duration 4000 video-1500k.mp4 \
video-1500k-f.mp4And finally package everything together again for dash (I used to use —use-segment-timeline but then again the result was out-of-sync).
I use mp4dash and not mp4box because I want to be able to encrypt everything later on for DRM.mp4dash --media-prefix=out \
video-2000k-f.mp4 \
video-1500k-f.mp4 \
--out dashThe result works in Firefox, Chrome, IE Edge via a webserver and via Cloudfront AWS Streaming also on older browsers.
So for me there are still 2 tasks to accomplish.
First I need to generate a HLS package for Apple Phone, IPad Users.
And second : I need to encrypt everything.So far my HLS command is :
ffmpeg -y -loglevel info ^
-i video-2000k.mp4 \
-i video-1500k.mp4 \
-i audio.mp4 \
-profile:v baseline -start_number 0 -hls_time 10 \
-flags -global_header -hls_list_size 0 -f hls hls/master.m3u8This basically works, but generates only 1 bandwith without the posibility of multi-streams.
I am not certain about that statement, but it looks that way.
Has anyone an idea on what I am doing wrong ? -
Four Trends Shaping the Future of Analytics in Banking
27 novembre 2024, par Daniel Crough — Banking and Financial Services