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Autres articles (111)
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La sauvegarde automatique de canaux SPIP
1er avril 2010, parDans le cadre de la mise en place d’une plateforme ouverte, il est important pour les hébergeurs de pouvoir disposer de sauvegardes assez régulières pour parer à tout problème éventuel.
Pour réaliser cette tâche on se base sur deux plugins SPIP : Saveauto qui permet une sauvegarde régulière de la base de donnée sous la forme d’un dump mysql (utilisable dans phpmyadmin) mes_fichiers_2 qui permet de réaliser une archive au format zip des données importantes du site (les documents, les éléments (...) -
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 (...) -
Contribute to a better visual interface
13 avril 2011MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community.
Sur d’autres sites (7059)
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Better vertical stabilization when simultaneously cropping to widescreen format
21 juillet 2016, par Kelley van EvertFirst of all : forgive me for maybe asking a stupid or somewhat uninformed question. I’m totally new to post processing video, stabilization, etc..
I’m shooting 1920x1080 compressed movie files with my Canon 5D2, and afterwards crop then to cinematic 1920x800 (2.4:1). (With Magic Lantern I use an overlay bitmap when shooting. And yes, I know that with magic lantern I can shoot RAW, but my cards as well as computer are not fast enough to deal with that much data.)
Before doing any production, I convert the big .MOV files to smaller ones, simultaneously stabilizing the video a bit, and cropping it to 1920x800. I do this with
ffmpegroughly as follows :ffmpeg -i f.MOV -vf vidstabdetect -f null -
ffmpeg -i f.MOV -c:v libx264 -profile:v high -crf 18 -vf "vidstabtransform, crop=in_w:in_h-280" -c:a aac -strict experimental f2.mp4However, the fact that a great deal of the vertical resolution is being cropped is not being used to be able to handle the stabilizing transforms better. Often, the image is stretched/skewed vertically, when this is not really needed given the crop used.
Is it possible in any way to use the crop befenificially in the stabilizing transforms ?
An example is the frame below. Here, I would rather have that the image is not stretched vertically at all, and just get away with a slight static zoom (crop), because the horizontal black border is the only problem in this frame.
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FFMPEG freeze last frame until end time
7 novembre 2019, par Michael Joseph AubryI have an animation that gets turned into a bunch of png’s. I am trying to keep the animation under 2 seconds. My users have a timeline where they can specify how long they want it to be visible.
I take about 120 screenshots that will mean 120 frames gets passed through at 60 frames per second, which is 2 seconds. The user may want the text to be there for 5 seconds.
My goal is to take the last frame and have it stay in the video until the specified end time.
How can I take the 120th frame and keep it in the video until then using FFMPEG.
Here is my generated command below.
ffmpeg
-i "http://storycreator.co:8181/unsplash/photo-1572800578930-fd1013b506c1?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=1080&fit=max&ixid=eyJhcHBfaWQiOjE1OTQxfQ"
-i "http://storycreator.co:8181/unsplash/photo-1573070303620-ea2602590e96?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=1080&fit=max&ixid=eyJhcHBfaWQiOjE1OTQxfQ"
-framerate 60
-i "./e4634ba0-00fd-11ea-ac54-9d3618dabf3e-%d.png"
-i "./watermark.png"
-f lavfi
-i color=c=white:s=1080x1080
-ss 17.75
-i "https://api.soundcloud.com/tracks/708135835/stream?client_id=d8976b195733c213f3ead34a2d95d1c1"
-filter_complex "
[0:v]scale=1983.2727272727273:1326.5454545454545[ovr1],
[1:v]scale=1283.3587786259543:1923.6641221374048[ovr2],
[2:v]scale=1080:1080,setpts=PTS-STARTPTS+(0/TB)[ovr3],
[3:v]scale=458:58[ovr4],
[4:v][ovr1]overlay=-780.3636807528409:-69.33335182883523:enable='between(t,0,3.5799999999999996)'[int1],
[int1][ovr2]overlay=-79.3167603470897:-45.92176131619752:enable='between(t,3.5900000000000003,15)'[int2], [int2][ovr3]overlay=0:0:enable='between(t,0,5)'[int3], [int3][ovr4]overlay=W-500:H-100:enable='between(t,0,15)'
[out]
"
-map "[out]"
-vcodec libx264
-crf 27
-preset veryfast
-map 5:0
-t 00:00:15
/var/folders/m1/4swfw09137x2b3d2h3_y5wmw0000gn/T/tmp-9351clz63oHIdLu7/fc160990-00fd-11ea-ac54-9d3618dabf3e.mp4 -
How to add subtitles using FFmpeg-kit ?
17 novembre 2024, par Mohammed BekeleI'm running a Flutter app with Ffmpeg-kit package to burn a subtitle on a video. I have a words list with the timings and map that to generate an srt and ass file, but when executing this it didn't work.


Firstly, here is how I generated the Ass file.


Future<string> _createAssFile() async {
 String filePath = await getAssOutputFilePath();

 final file = File(filePath);
 final buffer = StringBuffer();

 // Write ASS headers
 buffer.writeln('[Script Info]');
 buffer.writeln('Title: Generated ASS');
 buffer.writeln('ScriptType: v4.00+');
 buffer.writeln('Collisions: Normal');
 buffer.writeln('PlayDepth: 0');
 buffer.writeln('Timer: 100,0000');
 buffer.writeln('[V4+ Styles]');
 buffer.writeln(
 'Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding');
 buffer.writeln(
 'Style: Default,Arial,40,&H00FFFFFF,&H000000FF,&H00000000,&H80000000,1,1,1,1,100,100,0,0,1,1,1,2,10,10,10,1');
 buffer.writeln('[Events]');
 buffer.writeln(
 'Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text');

 // Write events (subtitles)
 for (int i = 0; i < widget.words.length; i++) {
 final word = widget.words[i];
 final startTime = _formatAssTime(word['startTime'].toDouble());
 final endTime = _formatAssTime(word['endTime'].toDouble());
 final text = word['word'];

 buffer.writeln('Dialogue: 0,$startTime,$endTime,Default,,0,0,0,,$text');
 }

 await file.writeAsString(buffer.toString());
 return filePath;
 }

 String _formatAssTime(double seconds) {
 final int hours = seconds ~/ 3600;
 final int minutes = ((seconds % 3600) ~/ 60);
 final int secs = (seconds % 60).toInt();
 final int millis = ((seconds - secs) * 1000).toInt() % 1000;

 return '${hours.toString().padLeft(1, '0')}:${minutes.toString().padLeft(2, '0')}:${secs.toString().padLeft(2, '0')}.${(millis ~/ 10).toString().padLeft(2, '0')}';
 }
</string>

Then I used this command which was the official way of adding ass file to a video.


String newCmd = "-i $videoPath -vf ass=$assFilePath -c:a copy $_outputPath";


Yet when executing this command it did not work. However I changed it to this command


String newCmd = "-i $videoPath -i $assFilePath $_outputPath";


Well, that code works but the styling is not being applied. So I tried yet another command to filter and position the ass file.


String newCmd = "-i $videoPath -i $assFilePath -filter_complex \"[0:v][1:s]ass=\\an5:text='%{event.text}',scale=iw*0.8:ih*0.8,setdar=16/9[outv]\" -map [outv] -c:a copy $_outputPath";


This made it even worse, because the app crashed when I ran this. Also there is a log for this command before crashing


F/libc (19624): Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x19 in tid 21314 (pool-4-thread-7), pid 19624 (ple.caption_app)
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
Build fingerprint: 'samsung/a15nsxx/a15:14/UP1A.231005.007/A155FXXU1AWKA:user/release-keys'
Revision: '5'
ABI: 'arm64'
Processor: '7'
Timestamp: 2024-07-10 19:27:40.812476860+0300
Process uptime: 1746s
Cmdline: com.example.caption_app
pid: 19624, tid: 21314, name: pool-4-thread-7 >>> com.example.caption_app <<<
uid: 10377
tagged_addr_ctrl: 0000000000000001 (PR_TAGGED_ADDR_ENABLE)
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0000000000000019
Cause: null pointer dereference
 x0 0000000000000001 x1 b400006ec98d8660 x2 0000000000000000 x3 0000000000000002
 x4 0000006f62d1ea12 x5 b400006e04f745ea x6 352f35372f64352f x7 7f7f7f7f7f7f7f7f
 x8 632ace36577a905e x9 632ace36577a905e x10 0000006e191378c0 x11 0000000000000001
 x12 0000000000000001 x13 0000000000000000 x14 0000000000000004 x15 0000000000000008
 x16 0000006e27ffa358 x17 0000006e27dbfb00 x18 0000006e00d48000 x19 0000006f62d1f0e8
 x20 0000006f62d24000 x21 0000006e27ffc5d0 x22 0000006e27ffc5f0 x23 0000000000000000
 x24 b400006f3f089248 x25 0000006f62d1f220 x26 b400006f3f057b20 x27 0000000000000002
 x28 0000000000000088 x29 0000006f62d1f100
 lr 0000006e27dbfb0c sp 0000006f62d1f0a0 pc 0000006e27dbfb10 pst 0000000060001000
1 total frames
backtrace:
 #00 pc 0000000000121b10 /data/app/~~oWqjrGA2indQhuEw6u_J2A==/com.example.caption_app-u2Ofk54FVtMc5D-i3SLC6g==/base.apk!libavfilter.so (offset 0x10a46000) (avfilter_inout_free+16) 
Lost connection to device.


I tried the normal command in my local machine on Windows, and this is what I used


ffmpeg -i F:\ffmpeg\video.avi -vf subtitles='F\:\\ffmpeg\\caption.srt':force_style='Fontsize=24' F:\ffmpeg\new.mp4


As you can see above when subtitles are used it had an extra backslashes for each path and a pre backslash after the partition letter. But I don't know if this does apply for android devices. How can I make sense of this ?


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