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Autres articles (82)
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Use, discuss, criticize
13 avril 2011, parTalk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
A discussion list is available for all exchanges between users. -
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 -
Keeping control of your media in your hands
13 avril 2011, parThe vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)
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hls.js starting a beginning with ANDROID mobile (chrome, webview also) and not live *** but works very nice in deskto, ios .. hls.js 1.0.0 2021-04-01
27 avril 2021, par JintorI'm streaming a .m3u8 with the latest hls.js 1.0.0 (not rc) but version of 2021-04-01...


example : the stream began at 5pm, and now it's 5:15 pm...


the stream start at live point in almost all browsers


The pattern I see here : ALL browsers in android (tested in Android 10) won't start at live point, only at 0...


I did all the tests


• Safari desktop => stream live at 5:15


• Safari mobile => stream live at 5:15


• WebView (Android) => ••• ISSUE : the player starts the stream at 0 (5pm)


• WKWebView (apple IOS iphone,ipad) => stream live at 5:15


• Chrome Desktop (mac/win) => stream live at 5:15


• Chrome MOBILE (Android) => ••• ISSUE : the player starts the stream at 0 (5pm)


• Chrome MOBILE (iPhone) => stream live at 5:15


• Microsoft EDGE Desktop => stream live at 5:15


• Microsoft EDGE mobile (android) => ••• ISSUE : the player starts the stream at 0 (5pm)


• Firefox Desktop (mac/win) => stream live at 5:15


• Opera Desktop (mac/win) => stream live at 5:15


• Opera Mini (iPhone) => stream live at 5:15


• Opera Mini (android) => ••• ISSUE : the player starts the stream at 0 (5pm)


• Brave Desktop (mac/win) => stream live at 5:15


• Brave Mobile (iPhone) => stream live at 5:15


• Brave Mobile (android) => ••• ISSUE : the player starts the stream at 0 (5pm)


This code


<code class="echappe-js"><script src="https://cdn.jsdelivr.net/npm/hls.js@latest"></script>


<script>&#xA; var video = document.getElementById("video");&#xA; var videoSrc = "https://www.example1.com/streaming/index.m3u8";&#xA; if (video.canPlayType("application/vnd.apple.mpegurl")) {&#xA; video.src = videoSrc;&#xA; } else if (Hls.isSupported()) {&#xA; var config = {&#xA; autoStartLoad: true,&#xA; startPosition: -1,&#xA; debug: false,&#xA; capLevelOnFPSDrop: false,&#xA; capLevelToPlayerSize: false,&#xA; defaultAudioCodec: undefined,&#xA; initialLiveManifestSize: 1,&#xA; maxBufferLength: 30,&#xA; maxMaxBufferLength: 500,&#xA; backBufferLength: Infinity,&#xA; maxBufferSize: 60 * 1000 * 1000,&#xA; maxBufferHole: 0.5,&#xA; highBufferWatchdogPeriod: 2,&#xA; nudgeOffset: 0.1,&#xA; nudgeMaxRetry: 3,&#xA; maxFragLookUpTolerance: 0.25,&#xA; liveSyncDurationCount: 3,&#xA; liveMaxLatencyDurationCount: Infinity,&#xA; liveDurationInfinity: false,&#xA; enableWorker: true,&#xA; enableSoftwareAES: true,&#xA; manifestLoadingTimeOut: 10000,&#xA; manifestLoadingMaxRetry: 1,&#xA; manifestLoadingRetryDelay: 1000,&#xA; manifestLoadingMaxRetryTimeout: 64000,&#xA; startLevel: undefined,&#xA; levelLoadingTimeOut: 10000,&#xA; levelLoadingMaxRetry: 4,&#xA; levelLoadingRetryDelay: 1000,&#xA; levelLoadingMaxRetryTimeout: 64000,&#xA; fragLoadingTimeOut: 20000,&#xA; fragLoadingMaxRetry: 6,&#xA; fragLoadingRetryDelay: 1000,&#xA; fragLoadingMaxRetryTimeout: 64000,&#xA; startFragPrefetch: false,&#xA; testBandwidth: true,&#xA; progressive: false,&#xA; lowLatencyMode: true,&#xA; fpsDroppedMonitoringPeriod: 5000,&#xA; fpsDroppedMonitoringThreshold: 0.2,&#xA; appendErrorMaxRetry: 3,&#xA; enableWebVTT: true,&#xA; enableIMSC1: true,&#xA; enableCEA708Captions: true,&#xA; stretchShortVideoTrack: false,&#xA; maxAudioFramesDrift: 1,&#xA; forceKeyFrameOnDiscontinuity: true,&#xA; abrEwmaFastLive: 3.0,&#xA; abrEwmaSlowLive: 9.0,&#xA; abrEwmaFastVoD: 3.0,&#xA; abrEwmaSlowVoD: 9.0,&#xA; abrEwmaDefaultEstimate: 500000,&#xA; abrBandWidthFactor: 0.95,&#xA; abrBandWidthUpFactor: 0.7,&#xA; abrMaxWithRealBitrate: false,&#xA; maxStarvationDelay: 4,&#xA; maxLoadingDelay: 4,&#xA; minAutoBitrate: 0,&#xA; emeEnabled: false&#xA; };&#xA; var hls = new Hls(config);&#xA; hls.loadSource(videoSrc);&#xA; hls.attachMedia(video);&#xA; } &#xA; video.addEventListener("loadedmetadata", function(){ video.muted = true; video.play(); }, false);&#xA; </script>


// here I added video.muted = true ; video.play() ; to auto start, if I try to autoplay unmuted, many browsers refuse this command...


// playsinline="true" is NEEDED for safari


••••••• THE FFMPEG COMMAND (working : it allows me to have 3 to 4 seconds delay ••••••


ffmpeg -re -i input.x -c:a aac -c:v libx264 
-movflags +dash -preset ultrafast 
-crf 28 -refs 4 -qmin 4 -pix_fmt yuv420p 
-tune zerolatency -c:a aac -ac 2 -profile:v main 
-flags -global_header -bufsize 969k 
-hls_time 1 -hls_list_size 0 -g 30 
-start_number 0 -streaming 1 -hls_playlist 1 
-lhls 1 -hls_playlist_type event -f hls path_to_index.m3u8


•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••


How can this be fixed ?


How can I make play at live point on load in android MOBILE ?


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Higher quality of JPEG frames extracted with FFMPEG from MP4 video [on hold]
5 juin 2019, par 2006pmachI got a 4k mp4 video file and my goal is to extract the individual frames. Unfortunately, the video is quite big 10GB and storing all the frames lossless (e.g. using png, results in 12MB per frame) is not an option. Therefore, I tired to save directly JPEG images. For me quality is more important than a small file size around 1MB would be good.
To do so I used FFMPEG as follows :ffmpeg -ss 00:04:52 -i video.MP4 -qscale:v $quality -frames:v 1 output-$quality.jpgI tried the full range from 2 to 31 for $quality and obtained the blue curve in the plot (PSNR vs. File size)
Additionally, I extracted the frame and saved it as PNG and used convert from ImageMagick to compress the PNG file as follows :
convert -quality $quality% frame.png output-$quality.jpgAgain I tried the full range for $quality from 10 to 100 and obtained the orange line in the plot (The highest quality is 50dB but uses 6MB, so I only show the results up to 2MB).
Now, my questions are as follows. Why is the quality of ffmpeg that much worse than when using ImageMagick ? Is it possible to increase the quality of the JPEG frames using ffmpeg directly or do I need to go via the PNG and then to JPEG. The later method is somehow suboptimal because it requires storing the png and will be much slower. Any suggestions ? My guess is that ffmpeg trades quality vs. speed...
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Crop HEVC video with Alpha
30 avril 2022, par TD540Looking for a way to crop an HEVC video with alpha, without losing transparency.


I made a little memoji video that I want to crop :
https://wetransfer.com/downloads/6d931ebf738fb1f9759c407a375579c920220430114044/53f514e45139c251058f054752939afa20220430114108/c8aa07


Tried using ffmpeg, but it loses transparency :


ffmpeg -i memoji.mov -vf "crop=300:330:160:40" -c:v prores_ks -pix_fmt yuva444p10le memoji-cropped.mov

The goal is to crop it, and save it as VP9 with an Alpha channel for Chromium/Firefox, as save it as H.265 for Safari


Any advice ?


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