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Autres articles (45)
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Submit bugs and patches
13 avril 2011Unfortunately a software is never perfect.
If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
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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 autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs
Sur d’autres sites (10746)
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How to timestamp video with seconds and milliseconds with ffmpeg ? [closed]
10 février, par JulianJI am trying to timestamp an .mp4 video with seconds and milliseconds using ffmpeg.
I can timestamp with hours, minutes, seconds and milliseconds using the code below but just can't figure out how to print seconds and milliseconds.


ffmpeg -i input.mp4 -vf "drawtext=:text='%{pts\:s}':rate=25:start_number=0:x=(w-tw)/2:y=h-(3*lh):fontcolor=white:fontsize=50,drawtext=:text='%{pts\:hms}':rate=25:start_number=0:x=(w-tw)/2:y=h-(2*lh):fontcolor=white:fontsize=50" output.mp4



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FFMpeg - Freeze First Frame for X seconds
13 mars 2021, par John DoeI need to pause/freeze the first frame of the video for 2 seconds before proceeding to the scroll effect. Here's what I have :


ffmpeg -y -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -loop 1 -i "temp.jpg" -i "floating.png" -filter_complex "[1:v]fps=fps=30,crop=1280:720:0:'t*(ih-oh)/120',overlay,scale=1280x720,drawtext=fontfile='font.ttf':text='text here':x=20:y=675:fontsize=60:fontcolor=white:shadowcolor=black:shadowx=2:shadowy=2,drawtext=fontfile='font.ttf':text='more text':x=w-tw-20:y=670:fontsize=70:fontcolor=white:shadowcolor=black:shadowx=2:shadowy=2[out]" -t 10 -map "[out]" -map "0:a" -shortest -c:v h264_qsv -c:a aac -ac 2 -ar 44100 -vb 30M -r 30 "video.mp4"



Any ideas ?


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How can I convert WebM file to WebP file ?
24 août 2020, par c-anI tried it with ffmpeg.


ffmpeg input.webm output.webp



input.webm
contains transparent background and But the alpha channel becomes white in webp. I think that means alpha channel doesn't come together.

I extracted frames with this command :


ffmpeg -i input.xxx -c:v libwebp output_%03d.webp



And it also gives me webp files with white background.


How can I convert it properly with alpha channel ? OR should I convert it from other format(extension) ?