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Médias (1)
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Bug de détection d’ogg
22 mars 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Video
Autres articles (18)
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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 (...) -
Les vidéos
21 avril 2011, parComme les documents de type "audio", Mediaspip affiche dans la mesure du possible les vidéos grâce à la balise html5 .
Un des inconvénients de cette balise est qu’elle n’est pas reconnue correctement par certains navigateurs (Internet Explorer pour ne pas le nommer) et que chaque navigateur ne gère en natif que certains formats de vidéos.
Son avantage principal quant à lui est de bénéficier de la prise en charge native de vidéos dans les navigateur et donc de se passer de l’utilisation de Flash et (...)
Sur d’autres sites (3539)
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tests/fate-run : Ensure that THREADS=random is actually random
19 septembre 2023, par Andreas Rheinhardttests/fate-run : Ensure that THREADS=random is actually random
From the documentation of GNU awk [1] :
"In most awk implementations, including gawk, rand() starts generating
numbers from the same starting number, or seed, each time you run awk.45
Thus, a program generates the same results each time you run it. The
numbers are random within one awk run but predictable from run to run.
This is convenient for debugging, but if you want a program to do
different things each time it is used, you must change the seed to a
value that is different in each run. To do this, use srand()."This commit does exactly this.
Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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when use idb and ffmepg to record video, Appium Session lose
6 septembre 2023, par azhiWhen use Appium to start the session and open app in iOS, connection will lost after using idb and ffmepg command to record video in java process. At the same time, Xcode will occur connection lost issue. If i open WDA again by manual in iPhone, tests again and connection will be normal. I tied switching port for WDA, unluckily it's the same result. Have any ideas for this, graceful for advice.


test normal when use this way to record video.


Appium log :

[Xcode] xcodebuild exited with code '65' and signal 'null' [HTTP] —> GET /session/f70eef73-ef99-4341-822f-d285d74a8614/timeouts [HTTP] {} [debug] [AppiumDriver@8f28] Encountered internal error running command : NoSuchDriverError : A session is either terminated or not started [debug] [AppiumDriver@8f28] at asyncHandler (/opt/homebrew/lib/node_modules/appium/node_modules/@appium/base-driver/lib/protocol/protocol.js:315:15) [debug] [AppiumDriver@8f28] at /opt/homebrew/lib/node_modules/appium/node_modules/@appium/base-driver/lib/protocol/protocol.js:518:15 [debug] [AppiumDriver@8f28] at Layer.handle [as handle_request] (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/layer.js:95:5) [debug] [AppiumDriver@8f28] at next (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/route.js:144:13) [debug] [AppiumDriver@8f28] at Route.dispatch (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/route.js:114:3) [debug] [AppiumDriver@8f28] at Layer.handle [as handle_request] (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/layer.js:95:5) [debug] [AppiumDriver@8f28] at /opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:284:15 [debug] [AppiumDriver@8f28] at param (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:365:14) [debug] [AppiumDriver@8f28] at param (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:376:14) [debug] [AppiumDriver@8f28] at Function.process_params (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:421:3) [debug] [AppiumDriver@8f28] at next (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:280:10) [debug] [AppiumDriver@8f28] at logger (/opt/homebrew/lib/node_modules/appium/node_modules/morgan/index.js:144:5) [debug] [AppiumDriver@8f28] at Layer.handle [as handle_request] (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/layer.js:95:5) [debug] [AppiumDriver@8f28] at trim_prefix (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:328:13) [debug] [AppiumDriver@8f28] at /opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:286:9 [debug] [AppiumDriver@8f28] at Function.process_params (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:346:12) [debug] [AppiumDriver@8f28] at next (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:280:10) [debug] [AppiumDriver@8f28] at jsonParser (/opt/homebrew/lib/node_modules/appium/node_modules/body-parser/lib/types/json.js:113:7) [debug] [AppiumDriver@8f28] at Layer.handle [as handle_request] (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/layer.js:95:5) [debug] [AppiumDriver@8f28] at trim_prefix (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:328:13) [debug] [AppiumDriver@8f28] at /opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:286:9 [debug] [AppiumDriver@8f28] at Function.process_params (/opt/homebrew/lib/node_modules/appium/node_modules/express/lib/router/index.js:346:12) [HTTP] GET /session/66e1fdca-4e8c-418e-a0d1-6d98779b874c/screenshot

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How can I use FFMPEG to extract a specific color from a video and put it over alpha ?
28 février 2024, par Michael MachaI have a rendered animation which looks great, but my original file was not saved properly and has lost some of the data. I can quickly get that data back, if I can extract a specific color from the rendered video to a new file or image sequence, over either a key color or preferably transparency.


Since I'm hand animating this, it's important that I automate as much as possible. I think FFMPEG could come to the rescue here and help me retrieve that data.


My current line is this :


ffmpeg -i ./"Light Bleeder Twirl Above.mp4" -vf "colorkey=0xe1eff9:0.1:0.1,format=rgba" -c:a copy ./out%04d.png



Here,
E1EFF9
is the color I'm after. It successfully extracts the handful of frames to PNG files, but it copies all of the data, not justE1EFF9
.

I'm not sure why
colorkey
isn't doing what I want it to. If someone could provide some insight, it would be much appreciated.

Addendum : So, my idea worked in principle ; I did a chroma key with Kdenlive and color-to-alpha'd the black to transparency after a manual rescale. It isn't exactly the same, but it's very close and saves a lot of time. I still feel like it should most certainly have worked with FFMPEG, much faster, and would still like to know what was wrong with my script.