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Médias (2)
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SPIP - plugins - embed code - Exemple
2 septembre 2013, par
Mis à jour : Septembre 2013
Langue : français
Type : Image
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Publier une image simplement
13 avril 2011, par ,
Mis à jour : Février 2012
Langue : français
Type : Video
Autres articles (76)
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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 (...) -
Automated installation script of MediaSPIP
25 avril 2011, parTo overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
The documentation of the use of this installation script is available here.
The code of this (...)
Sur d’autres sites (6343)
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Hardware accelerated decoding with FFmpeg falls back to software decoding
9 février 2024, par iexavSo I have followed the FFmpeg example for hardware accelerated decoding exactly as it is (I am referring to this example).


https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/hw_decode.c#L76


But I still seem to be decoding with the software decoder. When I open the task manager on windows the GPU isn't getting used. Before I make a call to av_hwframe_transfer_data() I check whether the frame is in the relevant hw_pix_fmt format and it is. Everything works, no errors, nothing, except the GPU is doing nothing. Now as an example I tried decoding a video that uses vp9 as a codec. If I specify the hardware accelerated codec I want by name it actually does work.


vidCodec=avcodec_find_decoder_by_name("vp9_cuvid"); 


When I do this and look at the task manager I can see that the CPU does much less work and my GPU actually does Video Decode work. Having to specify the hardware accelerated decoder for every single video I am decoding is ridiculous though.


Edit : as per user4581301's answer, here are the pieces of relevant code. (It's actually in java because I am using the java FFmpeg wrapper but it's basically just making a bunch of calls to FFmpeg functions.)



 ArrayList<string> deviceTypes = new ArrayList<>();
 int type = AV_HWDEVICE_TYPE_NONE;
 while ((type = av_hwdevice_iterate_types(type)) != AV_HWDEVICE_TYPE_NONE) {
 BytePointer p = av_hwdevice_get_type_name(type);

 deviceTypes.add(CString(p));
 }
 boolean flag=false;

 for(int j=0;j* Allocate a codec context for the decoder */
 if ((video_c = avcodec_alloc_context3(vidCodec)) == null) {
 throw new Exception("avcodec_alloc_context3() error: Could not allocate video decoding context.");
 }


 /* copy the stream parameters from the muxer */

 if ((ret = avcodec_parameters_to_context(video_c, video_st.codecpar())) < 0) {
 releaseUnsafe();
 throw new Exception("avcodec_parameters_to_context() error " + ret + ": Could not copy the video stream parameters.");
 }
 

 video_c.get_format(AvFormatGetter.getInstance());
 AVBufferRef hardwareDeviceContext =av_hwdevice_ctx_alloc(type);

 if ((ret = av_hwdevice_ctx_create(hardwareDeviceContext, type,(String) null, null, 0)) < 0) {
 System.err.println("Failed to create specified HW device. error " + ret);

 }else{
 video_c.hw_device_ctx(av_buffer_ref(hardwareDeviceContext));

 }
 


 
//The function that gets called for get_format
@Override
 public int call(AVCodecContext context, IntPointer format) {
 int p;


 for (int i=0;;i++) {
 if ((p=format.get(i)) == hw_pix_fmt) {
 return p;
 }
 if(p==-1){
 break;
 }
 }

 System.out.println(hw_pix_fmt +" is not found in the codec context");
 // Error

 return AV_PIX_FMT_NONE;
 }
 
//The method that's used for decoding video frames
 public Optional<boolean> decodeVideoFrame(AVPacket pkt, boolean readPacket, boolean keyFrames) throws Exception {

 int ret;
 // Decode video frame
 if (readPacket) {
 ret = avcodec_send_packet(video_c, pkt);
 
 if (ret < 0) {
 System.out.println("error during decoding");
 return Optional.empty();
 }

 if (pkt.data() == null && pkt.size() == 0) {
 pkt.stream_index(-1);
 }
 
 }

 // Did we get a video frame?
 while (true) {
 ret = avcodec_receive_frame(video_c, picture_hw);

 if (ret == AVERROR_EAGAIN() || ret == AVERROR_EOF()) {
 if (pkt.data() == null && pkt.size() == 0) {
 return Optional.empty();
 } else {

 return Optional.of(true);

 }
 } else if (ret < 0) {

 // Ignore errors to emulate the behavior of the old API
 // throw new Exception("avcodec_receive_frame() error " + ret + ": Error during video decoding.");
 return Optional.of(true);

 }

 if (!keyFrames || picture.pict_type() == AV_PICTURE_TYPE_I) {
 
 if(picture_hw.format()==hw_pix_fmt){
 if (av_hwframe_transfer_data(
 picture, // The frame that will contain the usable data.
 picture_hw, // Frame returned by avcodec_receive_frame()
 0) < 0) {
 throw new Exception("Could not transfer data from gpu to cpu. ");

 }
 }
 //... The rest of the method here
 return Optional.of(false);

 }
 }
 }
</boolean></string>

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FFMPEG .bat script not running
22 août 2018, par MrGreenI’ve got a folder full of .avi video files. I want to change the container of each of those to .mp4 using a .bat script.
This is the code :for i in "*.avi" do ffmpeg -i "$i" -c copy "outputs/${i%.avi}.mp4"; doneBut when i run the .bat cmd pops up for a split second and closes immediately. The folder for the output is there as well as the ffmpeg.exe.
Whats wrong ? -
sending FFMPEG the start_number of image sequence in a batch script
31 janvier 2023, par gethoI'm creating a batch script to daily convert screen captures to video
Its all working except I cant get the screen caps to start at 0001 each day,so my current script fails.


Is there a way within FFMPEG to just read all the files in a folder (e.g. if I have one folder with 500 files starting with 01234.jpg and another folder with files starting at 87654.jpg) ?


If not, can I use the batch script to find the start and finish points and send that to ffmpeg ?


my script


@echo off
setlocal enabledelayedexpansion

rem Check if a new folder has been added to the watched folder
for /f "tokens=*" %%a in ('dir "Y:\fastone_timelapse" /B /AD') do (
 set "new_folder=%%a"

 rem Check if jpeg files are present in the new folder
 if exist "Y:\ft\!new_folder!\*.jpg" (
 
ffmpeg.exe -f image2 -framerate 25 -pattern_type sequence -start_number 00001 -i "Y:\ft\!new_folder!\%%05d.jpg" -c:v libx265 -b:v 5000k -g 100 "Y:\ft\!new_folder!.mp4"


 )
)
endlocal


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