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Video d’abeille en portrait
14 mai 2011, par
Mis à jour : Février 2012
Langue : français
Type : Video
Autres articles (59)
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MediaSPIP v0.2
21 juin 2013, parMediaSPIP 0.2 est la première version de MediaSPIP stable.
Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...) -
Configuration spécifique pour PHP5
4 février 2011, parPHP5 est obligatoire, vous pouvez l’installer en suivant ce tutoriel spécifique.
Il est recommandé dans un premier temps de désactiver le safe_mode, cependant, s’il est correctement configuré et que les binaires nécessaires sont accessibles, MediaSPIP devrait fonctionner correctement avec le safe_mode activé.
Modules spécifiques
Il est nécessaire d’installer certains modules PHP spécifiques, via le gestionnaire de paquet de votre distribution ou manuellement : php5-mysql pour la connectivité avec la (...) -
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
Sur d’autres sites (9196)
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ffmpeg avformat_open_input() function causes memory leak when receiving live stream
12 septembre 2023, par george_dI have live streams (can be UDP or HLS, video codec is H264), from which I grab frames for further processing.


For this purpose, I use ffmpeg + nvjpeg + cuda libraries.


However I noticed memory leak - memory usage periodically (every 10-20 seconds) is increased by 100-400 KB, the amount and period may vary.


After disabling pieces of code one by one, I realized that it is
avformat_open_input()which causes memory leak.

No matter which buffer settings (https://ffmpeg.org/ffmpeg-protocols.html#udp) I choose for UDP, the leak still persists. Same goes for HLS streams.


I tried to find anything related to this problem, but all the sources I found claimed that this problem took place in the past and has been fixed.


Is there some mysterious setting I am missing, so that memory could be freed properly ?


Or is this memory supposed to be freed when processing frames (i.e. using
av_read_frame()andav_packet_unref(), etc) ?

Minimal example of code to reproduce the problem :


avformat_example.cpp


#include 
extern "C" {
 #include <libavformat></libavformat>avformat.h>
 #include <libavcodec></libavcodec>avcodec.h>
}

int main(int argc, char *argv[]){
 if (argc < 2) {
 return 1;
 }

 char* inputSource = argv[1];
 AVFormatContext *ctx = NULL;

 if (avformat_open_input(&ctx, inputSource, NULL, NULL) != 0) {
 av_log(NULL,
 AV_LOG_ERROR,
 "Cannot open '%s'",
 inputSource);
 return 1;
 }

 /*
 This loop is placed here to demonstrate
 avformat_open_input() causing leak.
 Actually, instead of noop loop there is logic of getting and processing frames,
 but it doesn't matter now.
 As loop goes on, the amount of leaked memory increases.
 */
 while(true) {
 sleep(1);
 }

 return 0;
}


Compile with :


g++ avformat_example.cpp -lavcodec -lavutil -lavformat -I/usr/include/ffmpeg-cuda -o avformat_open_input_example


Run :


./avformat_open_input_example "udp://127.0.0.1:5000?reuse=1&pkt_size=1316&buffer_size=1310720&fifo_size=40000"


Version of ffmpeg underlying libraries :


libavutil 58. 7.100 / 58. 7.100
libavcodec 60. 11.100 / 60. 11.100
libavformat 60. 5.100 / 60. 5.100
libavdevice 60. 2.100 / 60. 2.100
libavfilter 9. 8.100 / 9. 8.100
libswscale 7. 2.100 / 7. 2.100
libswresample 4. 11.100 / 4. 11.100


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How to minimize latency in ffmpeg stream Java ?
13 juillet 2022, par Taavi SõerdI need to stream ffmpeg video feed in android studio and need minimal latency. Code below has achieved that when playing on galaxy s21 ultra but when I play it on galaxy tab then it's like in slow motion. When i set buffer size to 0 I get minimal latency but can't actually even see the video as it's all corrupted (all gray and colored noise).


public class Decode implements Runnable {
public Activity activity;
AVFrame pFrameRGB;
SwsContext sws_ctx;
ByteBuffer bitmapBuffer;
Bitmap bmp;
byte[] array;
int imageViewWidth = 0;
int imageViewHeight = 0;
boolean imageChanged = true;
int v_stream_idx = -1;
int klv_stream_idx = -1;

boolean imageDrawMutex = false;

boolean imageIsSet = false;
ImageView imageView = MainActivity.getmInstanceActivity().findViewById(R.id.imageView);

String mFilename = "udp://@" + MainActivity.connectionIP;;
UasDatalinkLocalSet mLatestDls;

public Decode(Activity _activity) {
 this.activity = _activity;
}

public void create_decoder(AVCodecContext codec_ctx) {
 imageChanged = true;

 // Determine required buffer size and allocate buffer
 int numBytes =av_image_get_buffer_size(AV_PIX_FMT_RGBA, codec_ctx.width(),
 codec_ctx.height(), 1);
 BytePointer buffer = new BytePointer(av_malloc(numBytes));

 bmp = Bitmap.createBitmap(codec_ctx.width(), codec_ctx.height(), Bitmap.Config.ARGB_8888);

 array = new byte[codec_ctx.width() * codec_ctx.height() * 4];
 bitmapBuffer = ByteBuffer.wrap(array);

 sws_ctx = sws_getContext(
 codec_ctx.width(),
 codec_ctx.height(),
 codec_ctx.pix_fmt(),
 codec_ctx.width(),
 codec_ctx.height(),
 AV_PIX_FMT_RGBA,
 SWS_POINT,
 null,
 null,
 (DoublePointer) null
 );

 if (sws_ctx == null) {
 Log.d("app", "Can not use sws");
 throw new IllegalStateException();
 }

 av_image_fill_arrays(pFrameRGB.data(), pFrameRGB.linesize(),
 buffer, AV_PIX_FMT_RGBA, codec_ctx.width(), codec_ctx.height(), 1);
}

@Override
public void run() {
 Log.d("app", "Start decoder");

 int ret = -1, i = 0;
 String vf_path = mFilename;

 AVFormatContext fmt_ctx = new AVFormatContext(null);
 AVPacket pkt = new AVPacket();


 AVDictionary multicastDict = new AVDictionary();

 av_dict_set(multicastDict, "rtsp_transport", "udp_multicast", 0);

 av_dict_set(multicastDict, "localaddr", getIPAddress(true), 0);
 av_dict_set(multicastDict, "reuse", "1", 0);

 av_dict_set(multicastDict, "buffer_size", "0.115M", 0);

 ret = avformat_open_input(fmt_ctx, vf_path, null, multicastDict);
 if (ret < 0) {
 Log.d("app", String.format("Open video file %s failed \n", vf_path));
 byte[] error_message = new byte[1024];
 int elen = av_strerror(ret, error_message, 1024);
 String s = new String(error_message, 0, 20);
 Log.d("app", String.format("Return: %d", ret));
 Log.d("app", String.format("Message: %s", s));
 throw new IllegalStateException();
 }
 
 if (avformat_find_stream_info(fmt_ctx, (PointerPointer) null) < 0) {
 //System.exit(-1);
 Log.d("app", "Stream info not found");
 }


 avformat.av_dump_format(fmt_ctx, 0, mFilename, 0);

 int nstreams = fmt_ctx.nb_streams();

 for (i = 0; i < fmt_ctx.nb_streams(); i++) {
 if (fmt_ctx.streams(i).codecpar().codec_type() == AVMEDIA_TYPE_VIDEO) {
 v_stream_idx = i;
 }
 if (fmt_ctx.streams(i).codecpar().codec_type() == AVMEDIA_TYPE_DATA) {
 klv_stream_idx = i;
 }
 }
 if (v_stream_idx == -1) {
 Log.d("app", "Cannot find video stream");
 throw new IllegalStateException();
 } else {
 Log.d("app", String.format("Video stream %d with resolution %dx%d\n", v_stream_idx,
 fmt_ctx.streams(v_stream_idx).codecpar().width(),
 fmt_ctx.streams(v_stream_idx).codecpar().height()));
 }

 AVCodecContext codec_ctx = avcodec_alloc_context3(null);
 avcodec_parameters_to_context(codec_ctx, fmt_ctx.streams(v_stream_idx).codecpar());


 AVCodec codec = avcodec_find_decoder(codec_ctx.codec_id());


 AVDictionary avDictionary = new AVDictionary();

 av_dict_set(avDictionary, "fflags", "nobuffer", 0);


 if (codec == null) {
 Log.d("app", "Unsupported codec for video file");
 throw new IllegalStateException();
 }
 ret = avcodec_open2(codec_ctx, codec, avDictionary);
 if (ret < 0) {
 Log.d("app", "Can not open codec");
 throw new IllegalStateException();
 }

 AVFrame frm = av_frame_alloc();

 // Allocate an AVFrame structure
 pFrameRGB = av_frame_alloc();
 if (pFrameRGB == null) {
 //System.exit(-1);
 Log.d("app", "unable to init pframergb");
 }

 create_decoder(codec_ctx);

 int width = codec_ctx.width();
 int height = codec_ctx.height();

 double fps = 15;
 

 while (true) {
 try {
 Thread.sleep(1);
 } catch (Exception e) {

 }

 try {
 if (av_read_frame(fmt_ctx, pkt) >= 0) {
 if (pkt.stream_index() == v_stream_idx) {
 avcodec_send_packet(codec_ctx, pkt);

 if (codec_ctx.width() != width || codec_ctx.height() != height) {
 create_decoder(codec_ctx);
 width = codec_ctx.width();
 height = codec_ctx.height();
 }
 }

 if (pkt.stream_index() == klv_stream_idx) {

 byte[] klvDataBuffer = new byte[pkt.size()];

 for (int j = 0; j < pkt.size(); j++) {
 klvDataBuffer[j] = pkt.data().get(j);
 }

 try {
 KLV k = new KLV(klvDataBuffer, KLV.KeyLength.SixteenBytes, KLV.LengthEncoding.BER);
 byte[] main_payload = k.getValue();

 // decode the Uas Datalink Local Set from main_payload binary blob.
 mLatestDls = new UasDatalinkLocalSet(main_payload);

 if (mLatestDls != null) {

 MainActivity.getmInstanceActivity().runOnUiThread(new Runnable() {
 @RequiresApi(api = Build.VERSION_CODES.Q)
 @Override
 public void run() {
 MainActivity.getmInstanceActivity().updateKlv(mLatestDls);
 }
 });
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
 
 }

 int wasFrameDecoded = 0;
 while (wasFrameDecoded >= 0) {
 wasFrameDecoded = avcodec_receive_frame(codec_ctx, frm);

 if (wasFrameDecoded >= 0) {
 // get clip fps
 fps = 15; //av_q2d(fmt_ctx.streams(v_stream_idx).r_frame_rate());

 sws_scale(
 sws_ctx,
 frm.data(),
 frm.linesize(),
 0,
 codec_ctx.height(),
 pFrameRGB.data(),
 pFrameRGB.linesize()
 );

 if(!imageDrawMutex) {
 MainActivity.getmInstanceActivity().runOnUiThread(new Runnable() {
 @Override
 public void run() {
 if (imageIsSet) {
 imageDrawMutex = true;
 pFrameRGB.data(0).position(0).get(array);
 bitmapBuffer.rewind();
 bmp.copyPixelsFromBuffer(bitmapBuffer);

 if (imageChanged) {
 (imageView).setImageBitmap(bmp);
 imageChanged = false;
 }

 (imageView).invalidate();
 imageDrawMutex = false;
 } else {
 (imageView).setImageBitmap(bmp);
 imageIsSet = true;
 }
 }
 });
 }
 }
 }
 av_packet_unref(pkt);

 }
 } catch (Exception e) {
 e.printStackTrace();
 }

 if (false) {
 Log.d("threads", "false");

 av_frame_free(frm);

 avcodec_close(codec_ctx);
 avcodec_free_context(codec_ctx);

 avformat_close_input(fmt_ctx);
 }
 }
}


This code is running in Android Studio with Java. I'm quite new on this topic so not really sure even where to start.
What could be the cause of that ?


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Inconsistent behaviour of ffmpeg -i flag
19 mai 2021, par zeebrahI'm trying to write a Bash script that would download an audio track from youtube and convert it to Apple ringtone format, which is .m4r. The tools I employ are
youtube-dlandffmpeg. The former seems to work fine but I have a strange issue with the latter. When I try to pass the name of the file parametrically, shell prints that file or directory can't be found.


I use the same method for unwraping user input (or my defaults) for both commands but it only seems to work with
youtube-dl.

Example of what doesn't work and print the text above. Obviously, all the files are in fact there and accessible


youtube-dl -i --extract-audio --audio-format m4a -o $filepath_interim --audio-quality 0 $video_link
ffmpeg -i $filepath_interim -acodec copy -f ipod -ss $offset -t $length $filepath_out


So, I tried to do it with
''strings,$(command)syntax, it all failed. I only found one way to make it work, which is to hard code the values of the paths but this defeats the whole purpose of my script.

youtube-dl -i --extract-audio --audio-format m4a -o $filepath_interim --audio-quality 0 $video_link
ffmpeg -i ~/Downloads/ringtone.m4a -acodec copy -f ipod -ss $offset -t $length ~/Downloads/ringtone.m4r


I want to figure out why this keeps happening, whether it is in any way specific to
ffmpegor am I just missing some piece of knowledge about$name unwrapping.

Minimal Working Example. Run with bash or pack in script and run. If your path to
bashis different, please change the shebang :

#!/usr/local/bin/bash
# initialise
filepath_interim="~/Downloads/ringtone.m4a"
filepath_out="~/Downloads/ringtone.m4r"
video_link="https://www.youtube.com/watch?v=dQw4w9WgXcQ"
offset=0
length=30

# main part
youtube-dl -i --extract-audio --audio-format m4a -o $filepath_interim --audio-quality 0 $video_link
ffmpeg -i $filepath_interim -acodec copy -f ipod -ss $offset -t $length $filepath_out


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