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Médias (91)
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GetID3 - Boutons supplémentaires
9 avril 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Image
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Core Media Video
4 avril 2013, par
Mis à jour : Juin 2013
Langue : français
Type : Video
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The pirate bay depuis la Belgique
1er avril 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Image
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Bug de détection d’ogg
22 mars 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Video
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Exemple de boutons d’action pour une collection collaborative
27 février 2013, par
Mis à jour : Mars 2013
Langue : français
Type : Image
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Exemple de boutons d’action pour une collection personnelle
27 février 2013, par
Mis à jour : Février 2013
Langue : English
Type : Image
Autres articles (6)
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Contribute to documentation
13 avril 2011Documentation is vital to the development of improved technical capabilities.
MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
To contribute, register to the project users’ mailing (...) -
Submit bugs and patches
13 avril 2011Unfortunately a software is never perfect.
If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
You may also (...) -
MediaSPIP Player : problèmes potentiels
22 février 2011, parLe lecteur ne fonctionne pas sur Internet Explorer
Sur Internet Explorer (8 et 7 au moins), le plugin utilise le lecteur Flash flowplayer pour lire vidéos et son. Si le lecteur ne semble pas fonctionner, cela peut venir de la configuration du mod_deflate d’Apache.
Si dans la configuration de ce module Apache vous avez une ligne qui ressemble à la suivante, essayez de la supprimer ou de la commenter pour voir si le lecteur fonctionne correctement : /** * GeSHi (C) 2004 - 2007 Nigel McNie, (...)
Sur d’autres sites (1803)
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ffmpeg segment_atclocktime inaccutare file segment BEFORE the *:00 mark
25 octobre 2017, par Soft StrategyI use ffmpeg to save a single RTSP stream on multiple files, one for every minute. The command is similar to this (I’ve simplified it) :
ffmpeg -y -i rtsp://IP/media.amp -c copy -r 15 -f segment -segment_time 60 -reset_timestamps 1 -segment_atclocktime 1 -strftime 1 outputFile%Y-%m-%d_%H-%M-%S.mp4FFmpeg should create a new file every minute according to the following settings :
-segment_time 60 -segment_atclocktime 1FFmpeg should create a new file every minute around the *:00 seconds mark. Because of busy CPU sometimes the file resets at *:01 seconds or even later which is fine. Rarely, the file is reset just before the *:00 mark, and the timestamp is *:59 of the same minute of the previous file.
The file timestamps looks like this :
outputFile2017-10-25_12-30-00.mp4
outputFile2017-10-25_12-30-59.mp4Instead it should be :
outputFile2017-10-25_12-30-00.mp4
outputFile2017-10-25_12-31-00.mp4Again, this happens very rarely but screwes up my timeline a bit and it looks like ffmpeg skipped a minute.
Is this normal ? Is there some settings to avoid this ?
Thanks in advance.
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How to use ffmpeg api to make a filter overlay water mark ?
6 septembre 2022, par Leon LeeOS : Ubuntu 20.04


FFmpeg : 4.4.0


Test video :


Input #0, hevc, from './videos/akiyo_352x288p25.265' :
Duration : N/A, bitrate : N/A
Stream #0:0 : Video : hevc (Main), yuv420p(tv), 352x288, 25 fps, 25 tbr, 1200k tbn, 25 tbc


Test watermark :


200*200.png


I copy ffmpeg official example.


Compiler no error, run no error , but i can't see add watermark


Here is my code


#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libavutil></libavutil>opt.h>
#include <libavfilter></libavfilter>buffersink.h>
#include <libavfilter></libavfilter>buffersrc.h>
int open_input_file(AVFormatContext *fmt, AVCodecContext **codecctx, AVCodec *codec, const char *filename, int index)
{
 int ret = 0;
 char msg[500];
 *codecctx = avcodec_alloc_context3(codec);
 ret = avcodec_parameters_to_context(*codecctx, fmt->streams[index]->codecpar);
 if (ret < 0)
 {
 printf("avcodec_parameters_to_context error,ret:%d\n", ret);
 
 return -1;
 }

 // open 解码器
 ret = avcodec_open2(*codecctx, codec, NULL);
 if (ret < 0)
 {
 printf("avcodec_open2 error,ret:%d\n", ret);
 
 return -2;
 }
 printf("pix:%d\n", (*codecctx)->pix_fmt);
 return ret;
}

int init_filter(AVFilterContext **buffersrc_ctx, AVFilterContext **buffersink_ctx, AVFilterGraph **filter_graph, AVStream *stream, AVCodecContext *codecctx, const char *filter_desc)
{
 int ret = -1;
 char args[512];
 char msg[500];
 const AVFilter *buffersrc = avfilter_get_by_name("buffer");
 const AVFilter *buffersink = avfilter_get_by_name("buffersink");

 AVFilterInOut *input = avfilter_inout_alloc();
 AVFilterInOut *output = avfilter_inout_alloc();

 AVRational time_base = stream->time_base;
 enum AVPixelFormat pix_fmts[] = {AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE};

 if (!output || !input || !filter_graph)
 {
 ret = -1;
 printf("avfilter_graph_alloc/avfilter_inout_alloc error,ret:%d\n", ret);
 
 goto end;
 }
 snprintf(args, sizeof(args), "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d", codecctx->width, codecctx->height, codecctx->pix_fmt, stream->time_base.num, stream->time_base.den, codecctx->sample_aspect_ratio.num, codecctx->sample_aspect_ratio.den);
 ret = avfilter_graph_create_filter(buffersrc_ctx, buffersrc, "in", args, NULL, *filter_graph);
 if (ret < 0)
 {
 printf("avfilter_graph_create_filter buffersrc error,ret:%d\n", ret);
 
 goto end;
 }

 ret = avfilter_graph_create_filter(buffersink_ctx, buffersink, "out", NULL, NULL, *filter_graph);
 if (ret < 0)
 {
 printf("avfilter_graph_create_filter buffersink error,ret:%d\n", ret);
 
 goto end;
 }
 ret = av_opt_set_int_list(*buffersink_ctx, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
 if (ret < 0)
 {
 printf("av_opt_set_int_list error,ret:%d\n", ret);
 
 goto end;
 }
 /*
 * The buffer source output must be connected to the input pad of
 * the first filter described by filters_descr; since the first
 * filter input label is not specified, it is set to "in" by
 * default.
 */
 output->name = av_strdup("in");
 output->filter_ctx = *buffersrc_ctx;
 output->pad_idx = 0;
 output->next = NULL;

 /*
 * The buffer sink input must be connected to the output pad of
 * the last filter described by filters_descr; since the last
 * filter output label is not specified, it is set to "out" by
 * default.
 */
 input->name = av_strdup("out");
 input->filter_ctx = *buffersink_ctx;
 input->pad_idx = 0;
 input->next = NULL;

 if ((ret = avfilter_graph_parse_ptr(*filter_graph, filter_desc, &input, &output, NULL)) < 0)
 {
 printf("avfilter_graph_parse_ptr error,ret:%d\n", ret);
 
 goto end;
 }

 if ((ret = avfilter_graph_config(*filter_graph, NULL)) < 0)
 {
 printf("avfilter_graph_config error,ret:%d\n", ret);
 
 goto end;
 }
 end:
 avfilter_inout_free(&input);
 avfilter_inout_free(&output);
 return ret;
}

int main(int argc, char **argv)
{
 int ret;
 char msg[500];
 const char *filter_descr = "drawbox=x=100:y=100:w=100:h=100:color=pink@0.5"; // OK
 //const char *filter_descr = "movie=200.png[wm];[in][wm]overlay=10:10[out]"; //Test
 // const char *filter_descr = "scale=640:360,transpose=cclock";
 AVFormatContext *pFormatCtx = NULL;
 AVCodecContext *pCodecCtx;
 AVFilterContext *buffersink_ctx;
 AVFilterContext *buffersrc_ctx;
 AVFilterGraph *filter_graph;
 AVCodec *codec;
 int video_stream_index = -1;

 AVPacket packet;
 AVFrame *pFrame;
 AVFrame *pFrame_out;
 filter_graph = avfilter_graph_alloc();
 FILE *fp_yuv = fopen("test.yuv", "wb+");
 ret = avformat_open_input(&pFormatCtx, argv[1], NULL, NULL);
 if (ret < 0)
 {
 printf("avformat_open_input error,ret:%d\n", ret);
 
 return -1;
 }

 ret = avformat_find_stream_info(pFormatCtx, NULL);
 if (ret < 0)
 {
 printf("avformat_find_stream_info error,ret:%d\n", ret);
 
 return -2;
 }

 ret = av_find_best_stream(pFormatCtx, AVMEDIA_TYPE_VIDEO, -1, -1, &codec, 0);
 if (ret < 0)
 {
 printf("av_find_best_stream error,ret:%d\n", ret);
 
 return -3;
 }
 // 获取到视频流索引
 video_stream_index = ret;

 av_dump_format(pFormatCtx, 0, argv[1], 0);
 if ((ret = open_input_file(pFormatCtx, &pCodecCtx, codec, argv[1], video_stream_index)) < 0)
 {
 ret = -1;
 printf("open_input_file error,ret:%d\n", ret);
 
 goto end;
 }

 if ((ret = init_filter(&buffersrc_ctx, &buffersink_ctx, &filter_graph, pFormatCtx->streams[video_stream_index], pCodecCtx, filter_descr)) < 0)
 {
 ret = -2;
 printf("init_filter error,ret:%d\n", ret);
 
 goto end;
 }
 pFrame = av_frame_alloc();
 pFrame_out = av_frame_alloc();
 while (1)
 {
 if ((ret = av_read_frame(pFormatCtx, &packet)) < 0)
 break;

 if (packet.stream_index == video_stream_index)
 {
 ret = avcodec_send_packet(pCodecCtx, &packet);
 if (ret < 0)
 {
 printf("avcodec_send_packet error,ret:%d\n", ret);
 
 break;
 }

 while (ret >= 0)
 {
 ret = avcodec_receive_frame(pCodecCtx, pFrame);
 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
 {
 break;
 }
 else if (ret < 0)
 {
 printf("avcodec_receive_frame error,ret:%d\n", ret);
 
 goto end;
 }

 pFrame->pts = pFrame->best_effort_timestamp;

 /* push the decoded frame into the filtergraph */
 ret = av_buffersrc_add_frame_flags(buffersrc_ctx, pFrame, AV_BUFFERSRC_FLAG_KEEP_REF);
 if (ret < 0)
 {
 printf("av_buffersrc_add_frame_flags error,ret:%d\n", ret);
 
 break;
 }

 /* pull filtered frames from the filtergraph */
 while (1)
 {
 ret = av_buffersink_get_frame(buffersink_ctx, pFrame_out);
 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
 break;
 if (ret < 0)
 goto end;
 if (pFrame_out->format == AV_PIX_FMT_YUV420P)
 {
 //Y, U, V
 for (int i = 0; i < pFrame_out->height; i++)
 {
 fwrite(pFrame_out->data[0] + pFrame_out->linesize[0] * i, 1, pFrame_out->width, fp_yuv);
 }
 for (int i = 0; i < pFrame_out->height / 2; i++)
 {
 fwrite(pFrame_out->data[1] + pFrame_out->linesize[1] * i, 1, pFrame_out->width / 2, fp_yuv);
 }
 for (int i = 0; i < pFrame_out->height / 2; i++)
 {
 fwrite(pFrame_out->data[2] + pFrame_out->linesize[2] * i, 1, pFrame_out->width / 2, fp_yuv);
 }
 }
 av_frame_unref(pFrame_out);
 }
 av_frame_unref(pFrame);
 }
 }
 av_packet_unref(&packet);
 }
 end:
 avcodec_free_context(&pCodecCtx);
 fclose(fp_yuv);
}


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avcodec/svq3 : Mark decoder as init-threadsafe
11 février 2022, par Andreas Rheinhardtavcodec/svq3 : Mark decoder as init-threadsafe
The only interesting thing done in SVQ3's init function
is using zlib, but this is fine : https://zlib.net/zlib_faq.html#faq21Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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