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Somos millones 1
21 juillet 2014, par
Mis à jour : Juin 2015
Langue : français
Type : Video
Autres articles (42)
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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
Sur d’autres sites (5288)
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Fast video compression like Whatsapp
5 août 2015, par Douglas AnunciaçãoI need to speed up video compression in my Android app. I’m using FFMPEG and it takes 3 minutes to compress 80MB video. Does anyone knows a better solution ?
The command I’m using is :
/data/data/com.moymer/app_bin/ffmpeg -y -i /storage/emulated/0/DCIM/Camera/VID_20150803_164811363.mp4 -s 640x352 -r 25 -vcodec mpeg4 -ac 1 -preset ultrafast -strict -2 /storage/emulated/0/DCIM/Camera/compressed_video.mp4
I’m running this command using FFMPEG for Android from this github repo : https://github.com/guardianproject/android-ffmpeg-java
The code to use FFMPEG in my project is inside an AsyncTask and is copied below :
@Override
protected Object doInBackground(Object... params) {
ItemRoloDeCamera compressedVideo = new ItemRoloDeCamera();
File videoInputFile = new File(video.getSdcardPath());
File videoFolderFile = videoInputFile.getParentFile();
File videoOutputFile = new File(videoFolderFile, "video_comprimido_moymer.mp4");
if (videoFolderFile.exists())
android.util.Log.e("COMPRESS VIDEO UTILS", "video folder exist");
else
android.util.Log.e("COMPRESS VIDEO UTILS", "video folder DON'T exist");
if (videoInputFile.exists())
android.util.Log.e("COMPRESS VIDEO UTILS", "video input file exist");
else
android.util.Log.e("COMPRESS VIDEO UTILS", "video input file DON'T exist");
if (videoOutputFile.exists())
android.util.Log.e("COMPRESS VIDEO UTILS", "video output file exist");
else
android.util.Log.e("COMPRESS VIDEO UTILS", "video output file DON'T exist");
FfmpegController ffmpegController;
try {
ffmpegController = new FfmpegController(context, videoFolderFile);
Clip clipIn = new Clip(videoInputFile.getAbsolutePath());
ffmpegController.getInfo(clipIn, new ShellUtils.ShellCallback() {
@Override
public void shellOut(String shellLine) {
videoInfo.add(shellLine);
}
@Override
public void processComplete(int exitValue) {
videoInfo.add(String.valueOf(exitValue));
}
});
int rotate = getRotateMetadata();
Clip clipOut = new Clip(videoOutputFile.getAbsolutePath());
clipOut.videoFps = "24";
clipOut.videoBitrate = 512;
clipOut.audioChannels = 1;
clipOut.width = 640;
clipOut.height = 352;
if (rotate == 90)
clipOut.videoFilter = "transpose=1";
else if (rotate == 180)
clipOut.videoFilter = "transpose=1,transpose=1";
else if (rotate == 270)
clipOut.videoFilter = "transpose=1,transpose=1,transpose=1";
millisDuration = getVideoDuration(videoInputFile.getAbsolutePath());
float secondsDuration = millisDuration / 1000f;
clipOut.duration = secondsDuration;
ffmpegController.processVideo(clipIn, clipOut, true, new ShellUtils.ShellCallback() {
@Override
public void shellOut(String shellLine) {
android.util.Log.e("COMPRESS VIDEO UTILS", "shellOut - " + shellLine);
float percentage = getTimeMetadata(shellLine);
if (percentage >= 0f)
publishProgress(percentage);
}
@Override
public void processComplete(int exitValue) {
android.util.Log.e("COMPRESS VIDEO UTILS", "proccess complete - " + exitValue);
}
});
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (videoOutputFile.exists()) {
android.util.Log.e("COMPRESS VIDEO UTILS", "finished ffmpeg ---> video output file exist");
compressedVideo.setSdcardPath(videoOutputFile.getAbsolutePath());
return compressedVideo;
} else
android.util.Log.e("COMPRESS VIDEO UTILS", "finished ffmpeg ---> video output file DON'T exist");
}
return compressedVideo;
}
private float getTimeMetadata(String shellLine) {
float percentage = -1;
if (shellLine.contains("time=")) {
String[] timeLine = shellLine.split("=");
String time = timeLine[5];
time = time.replace("bitrate", "");
time = time.trim();
// String source = "00:10:17";
String[] tokens = time.split(":");
int secondsToMs = (int) (Float.parseFloat(tokens[2]) * 1000);
int minutesToMs = Integer.parseInt(tokens[1]) * 60000;
int hoursToMs = Integer.parseInt(tokens[0]) * 3600000;
long timeInMillis = secondsToMs + minutesToMs + hoursToMs;
percentage = (timeInMillis * 100.0f) / millisDuration;
}
return percentage;
}
private int getRotateMetadata() {
int rotate = 0;
String durationString = "";
for (String shellLine : videoInfo) {
if (shellLine.contains("rotate")) {
//rotate : 270
String[] rotateLine = shellLine.split(":");
rotate = Integer.parseInt(rotateLine[1].trim());
}
}
return rotate;
}
public static long getVideoDuration(String videoPath) {
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
retriever.setDataSource(videoPath);
String time = retriever
.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
long timeInmillisec = Long.parseLong(time);
return timeInmillisec;
}The only change I made in the processVideo method was to add the following lines when building the commmand :
cmd.add("-preset");
cmd.add("ultrafast"); -
video conversion using ffmpeg in php
24 mars 2012, par user1270879I am converting videos to .flv format using ffmpeg in php. The files are converted into .flv but the size of the file 0 kb. What is the reason ?
My code
$ffmpegPath = "/usr/bin/ffmpeg";
$flvtool2Path = "/usr/bin/flvtool2";
$cmd=($ffmpegPath . " -i " . $srcFile . " -ar " . $srcAR . " -ab " . $srcAB . " -f flv -s " . $srcWidth . "x" . $srcHeight . " " . $destFile . " | " . $flvtool2Path . " -U stdin " . $destFile); -
How to get MJPG stream video from IP camera using opencv
27 mars 2012, par OstorlabiBonjour
J'ai modifié le fichier cap_ffmpeg_impl, mais ça n'a pas marché ! est ce que quelqu'un la tester, et est ce que vous pouvez tester cette adresse IP : http://195.5.21.185/ et voir si ça marche dans votre programme.Merci