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Qu’est ce qu’un éditorial
21 juin 2013, parEcrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
Un éditorial est un article de type texte uniquement. Il a pour objectif de ranger les points de vue dans une rubrique dédiée. Un seul éditorial est placé à la une en page d’accueil. Pour consulter les précédents, consultez la rubrique dédiée.
Vous pouvez personnaliser le formulaire de création d’un éditorial.
Formulaire de création d’un éditorial Dans le cas d’un document de type éditorial, les (...) -
XMP PHP
13 mai 2011, parDixit Wikipedia, XMP signifie :
Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...) -
Sélection de projets utilisant MediaSPIP
29 avril 2011, parLes exemples cités ci-dessous sont des éléments représentatifs d’usages spécifiques de MediaSPIP pour certains projets.
Vous pensez avoir un site "remarquable" réalisé avec MediaSPIP ? Faites le nous savoir ici.
Ferme MediaSPIP @ Infini
L’Association Infini développe des activités d’accueil, de point d’accès internet, de formation, de conduite de projets innovants dans le domaine des Technologies de l’Information et de la Communication, et l’hébergement de sites. Elle joue en la matière un rôle unique (...)
Sur d’autres sites (4782)
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Issue when calling ffmpeg.c twice that makes the app crashes ?
6 février 2013, par JimmyI'm trying to call ffmpeg.c to trim a video based on this code 'video-trimmer'. So when I try to run the activity (that loads and uses the native lib) the first time I click trin it works and I could trim the video but when I try to run it again it crashes (and it only work with the application restarts).
So I spend three days looking for a solution for this issue, most of the answers says the issue with the static variables in ffmpeg.c and creating a lib that loads and unload the class fixes the issue (answer1, answer2). So I tried to apply the solution that is based on the answers and this github repo on the video-trimmer project but all my attempts failed.
Is there any one knows about a fork of the 'video-trimmer' project that fixes the issue ?. or can anybody provide step by step answer of how to implement the solution in the 'video-trimmer' project (because I tried to follow all the solution on the web and apply them in that project but with no luck).
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ffmpeg in child process doesn't exit when parent closes pipe
28 mars 2013, par user2221129This code snippet is from a pthread process. It is responsible for reading configuration/options to pass to ffmpeg. The data piped to ffmpeg is coming in on a ring buffer of video frames (as a proof of concept, in the final implementation these would be coming from a camera device). The parent writes to the child via a pipe established with dup2. The problem I'm having is that most of the time, the ffmpeg process doesn't seem to recognize the pipe has been closed by the parent (as strace shows the ffmpeg is in read). There are probably some unhandled mutex situations.
#define CHILD_READ writepipe[0]
#define PARENT_WRITE writepipe[1]
#define MAX_VIDEO_BUFFERS 30
static int last_frame_written = -1;
static int buffer_size = -1;
static void *video_buffer[MAX_VIDEO_BUFFERS];
#define MAXTHREADS 2
static pthread_t thread[MAXTHREADS];
static int sigusr[MAXTHREADS];
static int sigusr_thread[MAXTHREADS];
#define MAXPARAMETERS 100
void* encoder_thread(void *ptr)
{
int param;
const char **parameters = new const char* [MAXPARAMETERS];
ssize_t bytes_written_debug = 0;
int writepipe[2] = {-1,-1};
int last_frame_read = -1;
pid_t childpid;
// xxx
if ( 0 != pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) )
{
fprintf(stderr,"pthread_setcancelstate could not be set\n");
}
param = *(int*)ptr;
fprintf(stderr,"param = %d\n", param);
switch (param)
{
...read config file and populate parameters for child call...
}
while ( last_frame_written == -1 )
{
fprintf(stderr,"ENCODER THREAD WAITING\n");
sleep(1);
}
if ( pipe(writepipe) < 0 )
{
...handle error case...
}
if ( (childpid = fork()) < 0)
{
fprintf(stderr,"child failed\n");
}
else if ( 0 == childpid ) /* in the child */
{
dup2(CHILD_READ, STDIN_FILENO);
//close(CHILD_READ); // doesn't seem to matter
close(PARENT_WRITE);
execv("/usr/bin/ffmpeg",(char **)parameters);
return;
}
else /* in the parent */
{
fprintf(stderr,"THREAD CHILD PID: %d\n",childpid);
close(CHILD_READ);
while ( last_frame_written > -1 && 0==sigusr_thread[param] )
{
if ( last_frame_read != last_frame_written )
{
// send frame to child (ffmpeg)
last_frame_read = last_frame_written;
bytes_written_debug = write(PARENT_WRITE,video_buffer[last_frame_read], buffer_size);
if ( bytes_written_debug < 0 )
{
fprintf(stderr, "write error\n");
break;
}
}
usleep(10000); // assume ~100Hz rate
}
/// Problems begin now: no more data from main process,
/// Shouldn't this close "close" the pipe created with dup2 and hence EOF ffmpeg?
if ( close(PARENT_WRITE) )
{
fprintf(stderr,"\n\nclose failure! wtf?\n\n\n");
}
// debug sleep:
// waiting 10 sec doesn't seem to help...
// trying to give ffmpeg some time if it needs it
sleep(10);
// kill never fails here:
if ( !kill(childpid,SIGINT) )
{
fprintf(stderr, "\n\nkill child %d\n", childpid);
}
else
{
fprintf(stderr, "\n\nkill failed for child %d\n", childpid);
}
fprintf(stderr,"\n\nwaiting\n\n\n");
int status = 0;
// wait forever (in most cases); ps -axw shows all the ffmpeg's
wait(&status);
}
}
int main()
{
...
for ( int i = 0; i < MAXTHREADS; ++i)
{
sigusr[i] = 0;
sigusr_thread[i] = 0;
param[i] = i;
iret = pthread_create( &thread[i], NULL, encoder_thread, (void*) &param[i] );
}
...
// Maybe this is important to the pthread signaling?
// Don't think so because thread's SIGINT isn't picked up by signal handler (not shown)
sigemptyset(&set);
sigaddset(&set, SIGHUP);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGUSR1);
sigaddset(&set, SIGUSR2);
sigaddset(&set, SIGALRM);
/* block out these signals */
sigprocmask(SIG_BLOCK, &set, NULL);
...read file/populate frame buffer until file exhausted...
fprintf(stderr, "waiting for threads to exit\n");
for ( int i = 0; i < MAXTHREADS; ++i)
{
sigusr_thread[i] = 1;
pthread_join( thread[i], NULL);
}
fprintf(stderr, "done waiting for threads to exit\n");
...
return 0;
}I've embedded comments and questions in the thread's parent code after the frame buffer read/write loop.
Hope I've provided enough detail - stackoverflow posting noob ! Thank you.
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Android FFMPEG java concat multiple files
17 juillet 2015, par Kim TI’m using a fork of the cordova-plugin-video-editor library :
https://github.com/jbavari/cordova-plugin-video-editor/pull/13
Which uses the android-ffmpeg-java library here :
https://github.com/guardianproject/android-ffmpeg-java
The out of box cordova plugin example works well to encode a single video using the following code :
File tempFile = File.createTempFile("ffmpeg", null, appContext.getCacheDir());
FfmpegController ffmpegController = new FfmpegController(appContext, tempFile);
TranscodeCallback tcCallback = new TranscodeCallback();
Clip clipIn = new Clip(videoSrcPath);
Clip clipOut = new Clip(outputFilePath);
clipOut.videoCodec = "libx264";
clipOut.videoFps = "24"; // tailor this to your needs
clipOut.videoBitrate = 512; // 512 kbps - tailor this to your needs
clipOut.audioChannels = 1;
clipOut.width = outputWidth;
clipOut.height = outputHeight;
clipOut.duration = videoDuration;
ffmpegController.processVideo(clipIn, clipOut, true, tcCallback);This calls the android-ffmpeg-java code here :
They have a multiple file concat test example here :
So I have modified the cordova plugin code to match the example :
ArrayList<clip> listVideos = new ArrayList<clip>();
Clip clip = new Clip();
clip.path = new File(videoSrcPath).getCanonicalPath();
ffmpegController.getInfo(clip);
clip.duration = 5;
listVideos.add(clip);
Clip clip2 = new Clip();
clip2.path = new File(videoSrcPath2).getCanonicalPath();
ffmpegController.getInfo(clip2);
clip2.duration = 5;
listVideos.add(clip2);
Clip clipOut = new Clip();
clipOut.path = new File(outputFilePath).getCanonicalPath();
ffmpegController.concatAndTrimFilesMP4Stream(listVideos, clipOut, false, false, new ShellUtils.ShellCallback() {
@Override
public void shellOut(String shellLine) {
System.out.println("fc>" + shellLine);
}
@Override
public void processComplete(int exitValue) {
if (exitValue < 0)
System.err.println("concat non-zero exit: " + exitValue);
}
});
</clip></clip>However when run I get the error :
23:15:08.498 3218-3293/com.example.hello D/VideoEditor﹕ execute method starting
07-10 23:15:08.498 3218-3293/com.example.hello D/VideoEditor﹕ transcodeVideo firing
07-10 23:15:08.499 3218-3293/com.example.hello D/VideoEditor﹕ options: {"fileUri":"content:\/\/com.android.providers.media.documents\/document\/video%3A23389","fileUri2":"content:\/\/com.android.providers.media.documents\/document\/video%3A23390","outputFileName":"1436584506888","quality":2,"outputFileType":1,"optimizeForNetworkUse":1,"duration":2}
07-10 23:15:08.615 3218-3293/com.example.hello D/VideoEditor﹕ videoSrcPath: /storage/emulated/0/Movies/-a.mp4
07-10 23:15:08.615 3218-3293/com.example.hello D/VideoEditor﹕ videoSrcPath2: /storage/emulated/0/Movies/-b.mp4
07-10 23:15:08.618 3218-3293/com.example.hello V/VideoEditor﹕ outputFilePath: /storage/emulated/0/Movies/HelloWorld/VID_1436584506888.mp4
07-10 23:15:08.618 3218-3293/com.example.hello W/PluginManager﹕ THREAD WARNING: exec() call to VideoEditor.transcodeVideo blocked the main thread for 121ms. Plugin should use CordovaInterface.getThreadPool().
07-10 23:15:09.126 3742-3742/? W/linker﹕ /data/data/com.example.hello/app_bin/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
07-10 23:15:09.506 3750-3750/? W/linker﹕ /data/data/com.example.hello/app_bin/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
07-10 23:15:09.836 3218-3264/com.example.hello I/System.out﹕ fc>/data/data/com.example.hello/app_bin/ffmpeg -y -t 0 0 : 0 0 : 5.000000 -i /storage/emulated/0/Movies/-a.mp4 -f mpegts -c copy -an -bsf:v h264_mp4toannexb /storage/emulated/0/Android/data/com.example.hello/cache/ffmpeg-246029513.tmp/0.ts
07-10 23:15:09.864 3758-3758/? W/linker﹕ /data/data/com.example.hello/app_bin/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
07-10 23:15:09.865 3218-3759/com.example.hello I/System.out﹕ fc>WARNING: linker: /data/data/com.example.hello/app_bin/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
07-10 23:15:09.869 3218-3759/com.example.hello I/System.out﹕ fc>ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc> built on Dec 22 2014 12:52:34 with gcc 4.6 20120106 (prerelease)
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc> configuration: --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --prefix=/data/data/info.guardianproject.ffmpeg/app_opt --enable-pic --disable-shared --enable-static --cross-prefix=/home/n8fr8/dev/android/ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi- --sysroot=/home/n8fr8/dev/android/ndk/platforms/android-16/arch-arm --extra-cflags='-I../x264 -mfloat-abi=softfp -mfpu=neon -fPIE -pie' --extra-ldflags='-L../x264 -fPIE -pie' --enable-version3 --enable-gpl --disable-doc --enable-yasm --enable-decoders --enable-encoders --enable-muxers --enable-demuxers --enable-parsers --enable-protocols --enable-filters --enable-avresample --enable-libfreetype --disable-indevs --enable-indev=lavfi --disable-outdevs --enable-hwaccels --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-libx264 --enable-zlib
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc> libavutil 51. 54.100 / 51. 54.100
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc> libavcodec 54. 23.100 / 54. 23.100
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc> libavformat 54. 6.100 / 54. 6.100
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc> libavdevice 54. 0.100 / 54. 0.100
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc> libavfilter 2. 77.100 / 2. 77.100
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc> libswscale 2. 1.100 / 2. 1.100
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc> libswresample 0. 15.100 / 0. 15.100
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc> libpostproc 52. 0.100 / 52. 0.100
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc>[NULL @ 0xb6421100] Unable to find a suitable output format for '0'
07-10 23:15:09.870 3218-3759/com.example.hello I/System.out﹕ fc>0: Invalid argument
07-10 23:15:09.891 3218-3264/com.example.hello I/System.out﹕ fc>/data/data/com.example.hello/app_bin/ffmpeg -y -t 0 0 : 0 0 : 5.000000 -i /storage/emulated/0/Movies/-b.mp4 -f mpegts -c copy -an -bsf:v h264_mp4toannexb /storage/emulated/0/Android/data/com.example.hello/cache/ffmpeg-246029513.tmp/1.ts
07-10 23:15:09.912 3762-3762/? W/linker﹕ /data/data/com.example.hello/app_bin/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
07-10 23:15:09.913 3218-3763/com.example.hello I/System.out﹕ fc>WARNING: linker: /data/data/com.example.hello/app_bin/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
07-10 23:15:09.917 3218-3763/com.example.hello I/System.out﹕ fc>ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
07-10 23:15:09.917 3218-3763/com.example.hello I/System.out﹕ fc> built on Dec 22 2014 12:52:34 with gcc 4.6 20120106 (prerelease)
07-10 23:15:09.918 3218-3763/com.example.hello I/System.out﹕ fc> configuration: --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --prefix=/data/data/info.guardianproject.ffmpeg/app_opt --enable-pic --disable-shared --enable-static --cross-prefix=/home/n8fr8/dev/android/ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi- --sysroot=/home/n8fr8/dev/android/ndk/platforms/android-16/arch-arm --extra-cflags='-I../x264 -mfloat-abi=softfp -mfpu=neon -fPIE -pie' --extra-ldflags='-L../x264 -fPIE -pie' --enable-version3 --enable-gpl --disable-doc --enable-yasm --enable-decoders --enable-encoders --enable-muxers --enable-demuxers --enable-parsers --enable-protocols --enable-filters --enable-avresample --enable-libfreetype --disable-indevs --enable-indev=lavfi --disable-outdevs --enable-hwaccels --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-libx264 --enable-zlib
07-10 23:15:09.918 3218-3763/com.example.hello I/System.out﹕ fc> libavutil 51. 54.100 / 51. 54.100
07-10 23:15:09.918 3218-3763/com.example.hello I/System.out﹕ fc> libavcodec 54. 23.100 / 54. 23.100
07-10 23:15:09.918 3218-3763/com.example.hello I/System.out﹕ fc> libavformat 54. 6.100 / 54. 6.100
07-10 23:15:09.918 3218-3763/com.example.hello I/System.out﹕ fc> libavdevice 54. 0.100 / 54. 0.100
07-10 23:15:09.918 3218-3763/com.example.hello I/System.out﹕ fc> libavfilter 2. 77.100 / 2. 77.100
07-10 23:15:09.918 3218-3763/com.example.hello I/System.out﹕ fc> libswscale 2. 1.100 / 2. 1.100
07-10 23:15:09.918 3218-3763/com.example.hello I/System.out﹕ fc> libswresample 0. 15.100 / 0. 15.100
07-10 23:15:09.918 3218-3763/com.example.hello I/System.out﹕ fc> libpostproc 52. 0.100 / 52. 0.100
07-10 23:15:09.918 3218-3763/com.example.hello I/System.out﹕ fc>[NULL @ 0xb6321100] Unable to find a suitable output format for '0'
07-10 23:15:09.918 3218-3763/com.example.hello I/System.out﹕ fc>0: Invalid argument
07-10 23:15:09.940 3218-3264/com.example.hello I/System.out﹕ fc>/data/data/com.example.hello/app_bin/ffmpeg -y -i concat:/storage/emulated/0/Android/data/com.example.hello/cache/ffmpeg-246029513.tmp/0.ts|/storage/emulated/0/Android/data/com.example.hello/cache/ffmpeg-246029513.tmp/1.ts -c copy -an /storage/emulated/0/Movies/HelloWorld/VID_1436584506888.mp4
07-10 23:15:09.963 3766-3766/? W/linker﹕ /data/data/com.example.hello/app_bin/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
07-10 23:15:09.964 3218-3767/com.example.hello I/System.out﹕ fc>WARNING: linker: /data/data/com.example.hello/app_bin/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
07-10 23:15:09.971 3218-3767/com.example.hello I/System.out﹕ fc>ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
07-10 23:15:09.972 3218-3767/com.example.hello I/System.out﹕ fc> built on Dec 22 2014 12:52:34 with gcc 4.6 20120106 (prerelease)
07-10 23:15:09.972 3218-3767/com.example.hello I/System.out﹕ fc> configuration: --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --prefix=/data/data/info.guardianproject.ffmpeg/app_opt --enable-pic --disable-shared --enable-static --cross-prefix=/home/n8fr8/dev/android/ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi- --sysroot=/home/n8fr8/dev/android/ndk/platforms/android-16/arch-arm --extra-cflags='-I../x264 -mfloat-abi=softfp -mfpu=neon -fPIE -pie' --extra-ldflags='-L../x264 -fPIE -pie' --enable-version3 --enable-gpl --disable-doc --enable-yasm --enable-decoders --enable-encoders --enable-muxers --enable-demuxers --enable-parsers --enable-protocols --enable-filters --enable-avresample --enable-libfreetype --disable-indevs --enable-indev=lavfi --disable-outdevs --enable-hwaccels --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-libx264 --enable-zlib
07-10 23:15:09.973 3218-3767/com.example.hello I/System.out﹕ fc> libavutil 51. 54.100 / 51. 54.100
07-10 23:15:09.973 3218-3767/com.example.hello I/System.out﹕ fc> libavcodec 54. 23.100 / 54. 23.100
07-10 23:15:09.974 3218-3767/com.example.hello I/System.out﹕ fc> libavformat 54. 6.100 / 54. 6.100
07-10 23:15:09.974 3218-3767/com.example.hello I/System.out﹕ fc> libavdevice 54. 0.100 / 54. 0.100
07-10 23:15:09.974 3218-3767/com.example.hello I/System.out﹕ fc> libavfilter 2. 77.100 / 2. 77.100
07-10 23:15:09.975 3218-3767/com.example.hello I/System.out﹕ fc> libswscale 2. 1.100 / 2. 1.100
07-10 23:15:09.976 3218-3767/com.example.hello I/System.out﹕ fc> libswresample 0. 15.100 / 0. 15.100
07-10 23:15:09.976 3218-3767/com.example.hello I/System.out﹕ fc> libpostproc 52. 0.100 / 52. 0.100
07-10 23:15:09.976 3218-3767/com.example.hello I/System.out﹕ fc>concat:/storage/emulated/0/Android/data/com.example.hello/cache/ffmpeg-246029513.tmp/0.ts|/storage/emulated/0/Android/data/com.example.hello/cache/ffmpeg-246029513.tmp/1.ts: Not a directory
07-10 23:15:09.981 3218-3264/com.example.hello D/VideoEditor﹕ transcode exception
java.lang.Exception: There was a problem rendering the video: /storage/emulated/0/Movies/HelloWorld/VID_1436584506888.mp4
at org.ffmpeg.android.FfmpegController.concatAndTrimFilesMP4Stream(FfmpegController.java:1272)
at org.apache.cordova.videoeditor.VideoEditor$1.run(VideoEditor.java:257)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)I’m not sure why it says ’Not a directory’ ? Surely it’s valid because the files are created at the previous step ?
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