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The Great Big Beautiful Tomorrow
28 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Texte
Autres articles (40)
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Keeping control of your media in your hands
13 avril 2011, parThe vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...) -
Personnaliser en ajoutant son logo, sa bannière ou son image de fond
5 septembre 2013, parCertains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;
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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 (...)
Sur d’autres sites (6515)
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How to enable audio of two ffplay windows simultaneously ?(How can I hear audio of the video files at the same time ?)
9 octobre 2015, par Mitra MWhen more than one ffplay-window is running only the audio of one of them is enable , But I need to hear all of them at the same time.
For example I run two command-lines separately like this :
//command line 1
ffplay -i video1.avi
//command line 2
ffplay -i video2.aviHow can I hear audio of the video files at the same time ?
I did not find anything about that in the ffplay documents, So I want to change the ffplay source code.
this is
event_loopfunction (in ffplay.c) :static void event_loop(VideoState *cur_stream)
{
SDL_Event event;
double incr, pos, frac;
for (;;) {
double x;
refresh_loop_wait_event(cur_stream, &event);
switch (event.type) {
case SDL_KEYDOWN:
if (exit_on_keydown) {
do_exit(cur_stream);
break;
}
switch (event.key.keysym.sym) {
case SDLK_ESCAPE:
case SDLK_q:
do_exit(cur_stream);
break;
case SDLK_f:
toggle_full_screen(cur_stream);
cur_stream->force_refresh = 1;
break;
case SDLK_p:
case SDLK_SPACE:
toggle_pause(cur_stream);
break;
case SDLK_m:
toggle_mute(cur_stream);
break;
case SDLK_KP_MULTIPLY:
case SDLK_0:
update_volume(cur_stream, 1, SDL_VOLUME_STEP);
break;
case SDLK_KP_DIVIDE:
case SDLK_9:
update_volume(cur_stream, -1, SDL_VOLUME_STEP);
break;
case SDLK_s: // S: Step to next frame
step_to_next_frame(cur_stream);
break;
case SDLK_a:
stream_cycle_channel(cur_stream, AVMEDIA_TYPE_AUDIO);
break;
case SDLK_v:
stream_cycle_channel(cur_stream, AVMEDIA_TYPE_VIDEO);
break;
case SDLK_c:
stream_cycle_channel(cur_stream, AVMEDIA_TYPE_VIDEO);
stream_cycle_channel(cur_stream, AVMEDIA_TYPE_AUDIO);
stream_cycle_channel(cur_stream, AVMEDIA_TYPE_SUBTITLE);
break;
case SDLK_t:
stream_cycle_channel(cur_stream, AVMEDIA_TYPE_SUBTITLE);
break;
case SDLK_w:
#if CONFIG_AVFILTER
if (cur_stream->show_mode == SHOW_MODE_VIDEO && cur_stream->vfilter_idx < nb_vfilters - 1) {
if (++cur_stream->vfilter_idx >= nb_vfilters)
cur_stream->vfilter_idx = 0;
} else {
cur_stream->vfilter_idx = 0;
toggle_audio_display(cur_stream);
}
#else
toggle_audio_display(cur_stream);
#endif
break;
case SDLK_PAGEUP:
if (cur_stream->ic->nb_chapters <= 1) {
incr = 600.0;
goto do_seek;
}
seek_chapter(cur_stream, 1);
break;
case SDLK_PAGEDOWN:
if (cur_stream->ic->nb_chapters <= 1) {
incr = -600.0;
goto do_seek;
}
seek_chapter(cur_stream, -1);
break;
case SDLK_LEFT:
incr = -10.0;
goto do_seek;
case SDLK_RIGHT:
incr = 10.0;
goto do_seek;
case SDLK_UP:
incr = 60.0;
goto do_seek;
case SDLK_DOWN:
incr = -60.0;
do_seek:
if (seek_by_bytes) {
pos = -1;
if (pos < 0 && cur_stream->video_stream >= 0)
pos = frame_queue_last_pos(&cur_stream->pictq);
if (pos < 0 && cur_stream->audio_stream >= 0)
pos = frame_queue_last_pos(&cur_stream->sampq);
if (pos < 0)
pos = avio_tell(cur_stream->ic->pb);
if (cur_stream->ic->bit_rate)
incr *= cur_stream->ic->bit_rate / 8.0;
else
incr *= 180000.0;
pos += incr;
stream_seek(cur_stream, pos, incr, 1);
} else {
pos = get_master_clock(cur_stream);
if (isnan(pos))
pos = (double)cur_stream->seek_pos / AV_TIME_BASE;
pos += incr;
if (cur_stream->ic->start_time != AV_NOPTS_VALUE && pos < cur_stream->ic->start_time / (double)AV_TIME_BASE)
pos = cur_stream->ic->start_time / (double)AV_TIME_BASE;
stream_seek(cur_stream, (int64_t)(pos * AV_TIME_BASE), (int64_t)(incr * AV_TIME_BASE), 0);
}
break;
default:
break;
}
break;
case SDL_VIDEOEXPOSE:
cur_stream->force_refresh = 1;
break;
case SDL_MOUSEBUTTONDOWN:
if (exit_on_mousedown) {
do_exit(cur_stream);
break;
}
case SDL_MOUSEMOTION:
if (cursor_hidden) {
SDL_ShowCursor(1);
cursor_hidden = 0;
}
cursor_last_shown = av_gettime_relative();
if (event.type == SDL_MOUSEBUTTONDOWN) {
x = event.button.x;
} else {
if (event.motion.state != SDL_PRESSED)
break;
x = event.motion.x;
}
if (seek_by_bytes || cur_stream->ic->duration <= 0) {
uint64_t size = avio_size(cur_stream->ic->pb);
stream_seek(cur_stream, size*x/cur_stream->width, 0, 1);
} else {
int64_t ts;
int ns, hh, mm, ss;
int tns, thh, tmm, tss;
tns = cur_stream->ic->duration / 1000000LL;
thh = tns / 3600;
tmm = (tns % 3600) / 60;
tss = (tns % 60);
frac = x / cur_stream->width;
ns = frac * tns;
hh = ns / 3600;
mm = (ns % 3600) / 60;
ss = (ns % 60);
av_log(NULL, AV_LOG_INFO,
"Seek to %2.0f%% (%2d:%02d:%02d) of total duration (%2d:%02d:%02d) \n", frac*100,
hh, mm, ss, thh, tmm, tss);
ts = frac * cur_stream->ic->duration;
if (cur_stream->ic->start_time != AV_NOPTS_VALUE)
ts += cur_stream->ic->start_time;
stream_seek(cur_stream, ts, 0, 0);
}
break;
case SDL_VIDEORESIZE:
screen = SDL_SetVideoMode(FFMIN(16383, event.resize.w), event.resize.h, 0,
SDL_HWSURFACE|(is_full_screen?SDL_FULLSCREEN:SDL_RESIZABLE)|SDL_ASYNCBLIT|SDL_HWACCEL);
if (!screen) {
av_log(NULL, AV_LOG_FATAL, "Failed to set video mode\n");
do_exit(cur_stream);
}
screen_width = cur_stream->width = screen->w;
screen_height = cur_stream->height = screen->h;
cur_stream->force_refresh = 1;
break;
case SDL_QUIT:
case FF_QUIT_EVENT:
do_exit(cur_stream);
break;
case FF_ALLOC_EVENT:
alloc_picture(event.user.data1);
break;
default:
break;
}
}}
But I can not find the command that cause disable audio when change active window or lost focus in
event_loopfunction. -
how to change the frame rate and capturing image size from IP camera
6 décembre 2015, par rockycaiNow I have a IP camera and I want to capture image from it through RTSP.I use below code and it works well.But the camera’s frame rate is 25/s.So I got a lot of images per second.I don’t want it.And per image is 6.2MB.I also don’t want need to get high quality image.What can I do to slower the frame rate and smaller the size of image ?
#ifndef INT64_C
#define INT64_C(c) (c ## LL)
#define UINT64_C(c) (c ## ULL)
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*Include ffmpeg header file*/
#include <libavformat></libavformat>avformat.h>
#include <libavcodec></libavcodec>avcodec.h>
#include <libswscale></libswscale>swscale.h>
#include
#ifdef __cplusplus
}
#endif
#include
static void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame);
int main (int argc, const char * argv[])
{
AVFormatContext *pFormatCtx;
int i, videoStream;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVFrame *pFrame;
AVFrame *pFrameRGB;
AVPacket packet;
int frameFinished;
int numBytes;
uint8_t *buffer;
// Register all formats and codecs
av_register_all();
// const char *filename="C:\libraries\gfjyp.avi";
// Open video file
//AVDictionary *options = NULL;
//av_dict_set(&options,"rtsp_transport","tcp",0);
if(av_open_input_file(&pFormatCtx, argv[1], NULL, 0, NULL)!=0)
return -1; // Couldn't open file
// Retrieve stream information
if(av_find_stream_info(pFormatCtx)<0)
return -1; // Couldn't find stream information
// Dump information about file onto standard error
dump_format(pFormatCtx, 0, argv[1], false);
// Find the first video stream
videoStream=-1;
for(i=0; inb_streams; i++)
if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
{
videoStream=i;
break;
}
if(videoStream==-1)
return -1; // Didn't find a video stream
// Get a pointer to the codec context for the video stream
pCodecCtx=pFormatCtx->streams[videoStream]->codec;
// Find the decoder for the video stream
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
if(pCodec==NULL)
return -1; // Codec not found
// Open codec
if(avcodec_open(pCodecCtx, pCodec)<0)
return -1; // Could not open codec
// Hack to correct wrong frame rates that seem to be generated by some codecs
if(pCodecCtx->time_base.num>1000 && pCodecCtx->time_base.den==1)
pCodecCtx->time_base.den=1000;
//pCodecCtx->time_base.den=1;
//pCodecCtx->time_base.num=1;
// Allocate video frame
pFrame=avcodec_alloc_frame();
// Allocate an AVFrame structure
pFrameRGB=avcodec_alloc_frame();
if(pFrameRGB==NULL)
return -1;
// Determine required buffer size and allocate buffer
numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
pCodecCtx->height);
//buffer=malloc(numBytes);
buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
// Assign appropriate parts of buffer to image planes in pFrameRGB
avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
pCodecCtx->width, pCodecCtx->height);
// Read frames and save first five frames to disk
i=0;
while(av_read_frame(pFormatCtx, &packet)>=0)
{
// Is this a packet from the video stream?
if(packet.stream_index==videoStream)
{
// Decode video frame
avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished,
&packet);
// Did we get a video frame?
if(frameFinished)
{
static struct SwsContext *img_convert_ctx;
#if 0
// Older removed code
// Convert the image from its native format to RGB swscale
img_convert((AVPicture *)pFrameRGB, PIX_FMT_RGB24,
(AVPicture*)pFrame, pCodecCtx->pix_fmt, pCodecCtx->width,
pCodecCtx->height);
// function template, for reference
int sws_scale(struct SwsContext *context, uint8_t* src[], int srcStride[], int srcSliceY,
int srcSliceH, uint8_t* dst[], int dstStride[]);
#endif
// Convert the image into YUV format that SDL uses
if(img_convert_ctx == NULL) {
int w = pCodecCtx->width;
int h = pCodecCtx->height;
img_convert_ctx = sws_getContext(w, h,
pCodecCtx->pix_fmt,
w, h, PIX_FMT_RGB24, SWS_BICUBIC,
NULL, NULL, NULL);
if(img_convert_ctx == NULL) {
fprintf(stderr, "Cannot initialize the conversion context!\n");
exit(1);
}
}
int ret = sws_scale(img_convert_ctx, pFrame->data, pFrame->linesize, 0,
pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize);
#if 0
// this use to be true, as of 1/2009, but apparently it is no longer true in 3/2009
if(ret) {
fprintf(stderr, "SWS_Scale failed [%d]!\n", ret);
exit(-1);
}
#endif
// Save the frame to disk
if(i++<=1000)
SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, i);
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
//sleep(1);
}
// Free the RGB image
//free(buffer);
av_free(buffer);
av_free(pFrameRGB);
// Free the YUV frame
av_free(pFrame);
// Close the codec
avcodec_close(pCodecCtx);
// Close the video file
av_close_input_file(pFormatCtx);
return 0;
}
static void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame)
{
FILE *pFile;
char szFilename[32];
int y;
// Open file
sprintf(szFilename, "frame%d.ppm", iFrame);
pFile=fopen(szFilename, "wb");
if(pFile==NULL)
return;
// Write header
fprintf(pFile, "P6\n%d %d\n255\n", width, height);
// Write pixel data
for(y=0; ydata[0]+y*pFrame->linesize[0], 1, width*3, pFile);
// Close file
fclose(pFile);
} -
Révision 93466 : On permet à la fonction image_recadre d’avoir d’autres solutions de positionnement
8 décembre 2015, par marcimat@rezo.netque celles par défaut (center, top, left, right, bottom, ou des mélanges "top left" ou des valeurs "top=30")
en indiquant un nom spécifique, tel que `focus`, ce qui cherchera alors une fonction
inc_image_positionner_par_focus_dist() (en utilisant charger_fonction()). Si une telle fonction
existe, elle est appelée en transmettant l’image reçue, ainsi que la largeur et hauteur de destination désirée.
Elle doit alors retourner le positionnement souhaité pour le recadrage, tel que "top=230 left=300".Cette extension ’focus’ (et ’focus-center’) va être définie dans le plugin Centre Image.
C’est le même procédé (et même nommage) que ce qui est dans le plugin Image Responsive à travers
la fonction |image_proportions de ce plugin. Sauf qu’ici, on utilise la fonction habituelle
de SPIP |image_recadre (et donc il ne sera pas nécessaire d’avoir le plugin Image Responsive actif,
mais c’est tout à fait possible évidemment !).Cela permet donc ce type d’écriture (ce qui recadrera l’image sur le point d’intérêt si le plugin Centre Image est présent) :
`[(#LOGO_ARTICLE|image_recadre200:100, -, focus|image_reduire200, 100)]`
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