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Collections - Formulaire de création rapide
19 février 2013, par
Mis à jour : Février 2013
Langue : français
Type : Image
Autres articles (111)
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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 -
Supporting all media types
13 avril 2011, parUnlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)
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Script d’installation automatique de MediaSPIP
25 avril 2011, parAfin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
La documentation de l’utilisation du script d’installation (...)
Sur d’autres sites (5785)
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FFMPEG image sequence with longer durations after generated an output video
22 juin 2019, par Mohammad NurdinI’m using this library to create a deepfake video. The problem is the original duration video is shorter than the generated one. Original is 35 seconds but generated is 41 seconds. Image frames captured and converted are same, 1037 frames.
I’m using this command to generate the video.
ffmpeg -i video-frame-%0d.png -c:v libx264 -vf "fps=25,format=yuv420p" out.mp4
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x264 Downsides of a high CRF (22) intermediary codec between conversions instead of lossless
18 décembre 2019, par bobtheencoderI have a huge collection of video files that are in the range of CRF 16-20 taking up TB’s of space. The only need I have for these originals is that I have to encode them from time to time but the CRF of these final encodes is very low (CRF 26-28).
I understand that a lossy to lossy converstion ALWAYS results in some quality loss but my question is what if the intermediate file is almost visually lossless compared to the final output.
So to sum up, what quality difference should I expect from the following routes ?
CRF 18 (original) -----> CRF 28 (final)
CRF 18 (original) -----> CRF 22 (long-term storage) -----> Lossy CRF 28 (final) -
Why do I lose PTS information when encoding to H264 ?
1er mars 2019, par NickI have a video file, with this video stream :
ffmpeg -i original.avi
Stream #0:0 : Video : h264 (Main) (H264 / 0x34363248), yuv420p(tv,
bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 4204 kb/s, 59.94
fps, 59.94 tbr, 59.94 tbn, 59.94 tbcI can get the PTS information by running :
ffprobe -v 0 -of csv=p=0 -select_streams v -show_entries packet=pts_time original.avi
And I get the PTS for each frame line by line :
0.016683
0.116783
0.033367
0.050050
0.166833
0.083417
0.100100
0.216883
...Now I need to encode the video to H264 and be able to get the same PTS information afterwards, so I used :
ffmpeg -i original.avi -vcodec libx264 output.avi
With this video stream :
Stream #0:0 : Video : h264 (High) (H264 / 0x34363248),
yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 2289 kb/s, 59.94
fps, 59.94 tbr, 59.94 tbn, 119.88 tbcBut when I try to get the PTS information from the
output.avi
I only get :N/A
N/A
N/A
N/A
N/A
N/A
...What should I change in my command in order to keep the PTS information ?