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Autres articles (52)
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La file d’attente de SPIPmotion
28 novembre 2010, parUne file d’attente stockée dans la base de donnée
Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...) -
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 -
Les formats acceptés
28 janvier 2010, parLes commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
ffmpeg -codecs ffmpeg -formats
Les format videos acceptés en entrée
Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
Les formats vidéos de sortie possibles
Dans un premier temps on (...)
Sur d’autres sites (9514)
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av_read_frame() in ffmpeg returns -5 while receiving UDP data [closed]
26 février 2024, par zttangI'm working on an app which is using ffmpeg lib. There is a living source keep sending TS stream thru udp. Then I allocated a thread use ffmpeg receive the TS packets. the code for this thread is like :


void* av_source_thread(void *data) {
 char udp_url[50];
 snprintf(udp_url, sizeof(udp_url), "udp://127.0.0.1:12345");
 AVDictionary* options = NULL;
 av_dict_set(&options, "timeout", "500000", 0); // timeout=0.5s
 av_dict_set(&options, "overrun_nonfatal", "1", 0);
 av_dict_set(&options, "fifo_size", "278876", 0); //50MB

 AVFormatContext *ffmpeg_source = avformat_alloc_context();
 while (running) {
 if (avformat_open_input(&ffmpeg_source, udp_url, NULL, &options) != 0) {
 continue;
 } else {
 break;
 }
 }
 // Some code fill codec type and alloc context here

 av_format_inject_global_side_data(ffmpeg_source);
 AVPacket *packet = av_packet_alloc();
 while (running) {
 ret = av_read_frame(ffmpeg_source, packet);
 if (ret < 0) {
 char errbuf[AV_ERROR_MAX_STRING_SIZE];
 av_strerror(ret, errbuf, AV_ERROR_MAX_STRING_SIZE);
 usleep(10000);
 log("av_read_frame failed, Exit, %s, %d", errbuf, ret);
 continue;
 }
 putPkt2Q(packet); 
 }
 av_packet_free(&packet);
 avformat_close_input(&ffmpeg_source);
 av_dict_free(&options);
 return nullptr;
}


Then the packets will be sent to Q and other thread will process them. but when I run the program, the av_read_frame will return -5(I/O error) from time to time. and once it returned -5, it can not recover unless I restart this thread.


since this is a real time source, so lost some frames are acceptable, I just want to know how to avoid this kind of issue or how to recover without restart the whole thread. I tried to increase the fifo_size in options, but it does not work.


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avcodec_open2 returns -22 "Invalid argument" trying to encode AV_CODEC_ID_H264
26 mai 2023, par Fries of DoomI'm trying to use libavcodec to encode h264 video but avcodec_open2 returns -22 "Invalid argument" and I can't figure out why. Here is my code, which is mostly a copy from the encode example from libavcodec.


/* find the mpeg1video encoder */
 const AVCodec* codec = avcodec_find_encoder(AV_CODEC_ID_H264);
 if (!codec) {
 fprintf(stderr, "Codec '%s' not found\n", "h.264");
 exit(1);
 }

 AVCodecContext* codecContext = avcodec_alloc_context3(codec);
 if (!codecContext) {
 fprintf(stderr, "Could not allocate video codec context\n");
 exit(1);
 }

 AVPacket* pkt = av_packet_alloc();
 if (!pkt)
 exit(1);

 /* put sample parameters */
 codecContext->bit_rate = 400000;
 /* resolution must be a multiple of two */
 codecContext->width = 1920;
 codecContext->height = 1080;
 /* frames per second */
 codecContext->time_base = { 1, 25 };
 codecContext->framerate = { 25, 1 };

 /* emit one intra frame every ten frames
 * check frame pict_type before passing frame
 * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
 * then gop_size is ignored and the output of encoder
 * will always be I frame irrespective to gop_size
 */
 codecContext->gop_size = 10;
 codecContext->max_b_frames = 1;
 codecContext->codec_type = AVMEDIA_TYPE_VIDEO;
 codecContext->pix_fmt = AV_PIX_FMT_YUV420P;

 if (codec->id == AV_CODEC_ID_H264)
 av_opt_set(codecContext->priv_data, "profile", "baseline", 0);

 /* open it */
 int ret = avcodec_open2(codecContext, codec, nullptr);
 if (ret < 0) {
 char eb[AV_ERROR_MAX_STRING_SIZE];
 fprintf(stderr, "Could not open codec: %s\n", av_make_error_string(eb, AV_ERROR_MAX_STRING_SIZE, ret));
 exit(1);
 }


Does anyone know what I'm doing wrong ?


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AVCodecContex returns zero for width and height in android
17 février 2023, par WhoamiNot sure what was my mistake in the below code. I m trying with ffmpeg 0.11 and SDL2.0 in android.



QUESTION :
Why Width and Height of the CodecContext gives me always zero ?..



int main(int argc, char *argv[])
{

 int flags;
 flags = SDL_INIT_VIDEO | SDL_INIT_TIMER;

 if (SDL_Init (flags)) {
 LOGD ("Could not intialize Video for SDL: %s \n", SDL_GetError());
 }
 else 
 LOGD (" SUCCESS: SDL_Init ");

 // ffmpeg Register all services..
 ffmpeg_register_all (); 


 pFrame = avcodec_alloc_frame ();
 context = avformat_alloc_context();

 err = avformat_open_input (&context, "rtsp:ip:port", NULL, NULL);
 if ( err < 0) {
 __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Unable to open rtsp... ");

 return -1;
 }

 for (i = 0; i < context->nb_streams; i++)
 { 
 // Find the Decoder.
 codec = avcodec_find_decoder(context->streams[i]->codec->codec_id);
 if (codec->type == AVMEDIA_TYPE_VIDEO ) {
 __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Found Video Streaming.. ");
 videoStreamIndex = i;

 }
 }

 // Play RTSP
 av_read_play(context);

 // Get Codec Context.
 pCodecCtx = context->streams[videoStreamIndex]->codec;
 if ( pCodecCtx == NULL )
 __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "CodecCtx is NULL>>> ");
 else
 __android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "CodecCtx is <<<ok>>> ");


 //Find the Decoder.
 pCodec = avcodec_find_decoder (pCodecCtx->codec_id);
 avcodec_open2 (pCodecCtx, pCodec, NULL);


 int w = pCodecCtx->width; // Why me getting 0 ? 
 int h = pCodecCtx->height;

 window = SDL_CreateWindow ("Test ffmpeg",SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, w, h, SDL_WINDOW_SHOWN|SDL_WINDOW_ALLOW_HIGHDPI);
 // What this HIGHDPI Means ??

 if ( window != NULL ) 
 {
 LOGD (" WINDOW CREATED.. , create Renderer ..");
 renderer = SDL_CreateRenderer (window, -1, 0); 
 }
 else
 {
 LOGD (" Invalid SDL Window "); 
 }
__android_log_print(ANDROID_LOG_DEBUG, "ffmpegguard", "Width and Height of PCodeccCtx.. %d .. %d " , w, h); 
 return 0;
}
</ok>

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