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Autres articles (34)
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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 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 -
Gestion de la ferme
2 mars 2010, parLa ferme est gérée dans son ensemble par des "super admins".
Certains réglages peuvent être fais afin de réguler les besoins des différents canaux.
Dans un premier temps il utilise le plugin "Gestion de mutualisation"
Sur d’autres sites (6192)
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What's the Netflix / vmaf result stand for ?
1er septembre 2021, par HanamakiI ran the vamf between two mp4 files, and I got the result as :



<metric min="0.294617" max="0.999526" mean="0.902007"></metric>
<metric min="0.559920" max="0.994265" mean="0.918411"></metric>
<metric min="0.372149" max="0.999764" mean="0.907398"></metric>
<metric min="0.226668" max="0.999331" mean="0.915917"></metric>
<metric min="0.224996" max="1.010998" mean="0.881612"></metric>
<metric min="0.000000" max="32.177296" mean="6.365028"></metric>
<metric min="0.000000" max="145.765976" mean="7.202581"></metric>
<metric min="0.008498" max="0.910434" mean="0.247533"></metric>
<metric min="0.023310" max="0.990787" mean="0.457384"></metric>
<metric min="0.029596" max="0.995830" mean="0.529965"></metric>
<metric min="0.032303" max="0.997724" mean="0.586864"></metric>
<metric min="0.000000" max="100.000000" mean="71.630354"></metric>
 


I got the "vif" from the paper "IMAGE INFORMATION AND VISUAL QUALITY". However,what's the meaning of 4 scales of vif ?
And any detail introduction about this result ? Thank you very much.


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Rotation on Video frame image makes video quality low and becomes green ffmpeg opencv
21 novembre 2013, par bindalI am working on one application in which i have to record video on touch which includes pause recording so , i am using FFmpegFrameRecorder for that
But when i am recording video with rear camera then in onpreviewframe
i am getting yuvIplImage in portrait mode that is correct but when i
am recording with front camera in portrait mode then in onPreviewframe
i am getting image upside down , so my half, so from that result my
half video is showing in correct portrait mode and remaining half
video id showing upside down, so i am applying rotation on yuvIplImage
when recording from front cameraHere is my onPreviewFrame Method
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
long frameTimeStamp = 0L;
if (mAudioTimestamp == 0L && firstTime > 0L)
frameTimeStamp = 1000L * (System.currentTimeMillis() - firstTime);
else if (mLastAudioTimestamp == mAudioTimestamp)
frameTimeStamp = mAudioTimestamp + frameTime;
else {
long l2 = (System.nanoTime() - mAudioTimeRecorded) / 1000L;
frameTimeStamp = l2 + mAudioTimestamp;
mLastAudioTimestamp = mAudioTimestamp;
}
synchronized (mVideoRecordLock) {
if (recording && rec && lastSavedframe != null
&& lastSavedframe.getFrameBytesData() != null
&& yuvIplImage != null) {
mVideoTimestamp += frameTime;
if (lastSavedframe.getTimeStamp() > mVideoTimestamp)
mVideoTimestamp = lastSavedframe.getTimeStamp();
try {
yuvIplImage.getByteBuffer().put(
lastSavedframe.getFrameBytesData());
videoRecorder.setTimestamp(lastSavedframe
.getTimeStamp());
// if (defaultCameraId == 1) {
// CvSize size = new CvSize(yuvIplImage.height(),
// yuvIplImage.width());
// IplImage yuvIplImage2 = opencv_core.cvCreateImage(
// size, yuvIplImage.depth(),
// yuvIplImage.nChannels());
//
// videoRecorder.record(yuvIplImage2);
// } else {
// }
if (defaultCameraId == 1) {
yuvIplImage = rotate(yuvIplImage, 270);
videoRecorder.record(yuvIplImage);
}else
{
videoRecorder.record(yuvIplImage);
}
// else
// opencv_core.cvTranspose(yuvIplImage, yuvIplImage);
} catch (com.googlecode.javacv.FrameRecorder.Exception e) {
e.printStackTrace();
}
}
lastSavedframe = new SavedFrames(data, frameTimeStamp);
}
}
}Here is rotation function
public static IplImage rotate(IplImage image, double angle) {
IplImage copy = opencv_core.cvCloneImage(image);
IplImage rotatedImage = opencv_core.cvCreateImage(
opencv_core.cvGetSize(copy), copy.depth(), copy.nChannels());
CvMat mapMatrix = opencv_core.cvCreateMat(2, 3, opencv_core.CV_32FC1);
// Define Mid Point
CvPoint2D32f centerPoint = new CvPoint2D32f();
centerPoint.x(copy.width() / 2);
centerPoint.y(copy.height() / 2);
// Get Rotational Matrix
opencv_imgproc.cv2DRotationMatrix(centerPoint, angle, 1.0, mapMatrix);
// opencv_core.cvReleaseImage(copy);
// Rotate the Image
opencv_imgproc.cvWarpAffine(copy, rotatedImage, mapMatrix,
opencv_imgproc.CV_INTER_CUBIC
+ opencv_imgproc.CV_WARP_FILL_OUTLIERS,
opencv_core.cvScalarAll(170));
opencv_core.cvReleaseImage(copy);
opencv_core.cvReleaseMat(mapMatrix);
return rotatedImage;
}But Final output of video makes half of the video green
Thanks in advance
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FFMPEG : burn SRT files to a transparent video file ?
19 septembre 2017, par TaapoI need to create several versions of srt/ssa subtitles for another editor. To minimize the problems that can rise (encoding, etc) I want to provide a separate AVI file that can be overlayed onto another file.
So I would like to use FFMPEG to burn an "empty" (transparent) video file which has the length of the subtitle file, and with the subtitles burnt in. How would this be done in FFMPEG ?
Before someone says this is a bad idea (which someone already did), there are use cases where this technique would be helpful. I’m fully aware that this would create big files, but most real-life editors don’t care about size - but about solutions. Judging from other posts (on other forums) there seem to be a need for others as well. And since a professional subtitler like Lemony Subtitler is offering the option, I suppose this is not really a bad idea.
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