Hello, I don't know if it's the good place to ask that but I have a problem with my program. It's a program to try to save a stream video from an ip camera to a file. When I try to execute my program this is the error that's returns on the console :
[root@localhost Téléchargements]# ./my_streamer [ingenient @ 0xbeec60] Could not find codec parameters for stream 0 (Video: mjpeg, none(bt470bg/unknown/unknown)): unspecified size Consider increasing the value for the 'analyzeduration' and 'probesize' options [root@localhost Téléchargements]# Is there a way to force the program to read a mjpeg video if it don't find it ? When I write the command line bellow everythings works fine : [root@localhost Téléchargements]# ffmpeg -i http://192.9.200.121/ipcam/mjpeg.cgi -y -map 0 -t 5 -c copy -f matroska _capture.mkv ffmpeg version N-48170-gc8bc9d1380-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2019 the FFmpeg developers built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516 configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gmp --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libvmaf --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libdav1d --enable-libxvid --enable-libzvbi --enable-libzimg libavutil 56. 26.100 / 56. 26.100 libavcodec 58. 47.102 / 58. 47.102 libavformat 58. 26.101 / 58. 26.101 libavdevice 58. 6.101 / 58. 6.101 libavfilter 7. 48.100 / 7. 48.100 libswscale 5. 4.100 / 5. 4.100 libswresample 3. 4.100 / 3. 4.100 libpostproc 55. 4.100 / 55. 4.100 Input #0, mpjpeg, from 'http://192.9.200.121/ipcam/mjpeg.cgi': Duration: N/A, bitrate: N/A Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc Output #0, matroska, to '_capture.mkv': Metadata: encoder : Lavf58.26.101 Stream #0:0: Video: mjpeg (Baseline) (MJPG / 0x47504A4D), yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 tbr, 1k tbn, 25 tbc Stream mapping: Stream #0:0 -> #0:0 (copy) Press [q] to stop, [?] for help frame= 125 fps= 23 q=-1.0 Lsize= 16528kB time=00:00:04.96 bitrate=27292.4kbits/s speed=0.914x video:16521kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.039828% [root@localhost Téléchargements]# Thanks a lot for your help ! This is my source (I take it on the web it is only to test to save a stream video to a file like I said before): #include <stdio.h> #include <stdlib.h> #include <iostream> #include <fstream> #include <sstream> extern "C" { #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <libavformat/avio.h> #include <libswscale/swscale.h> } int main(int argc, char** argv) { // Open the initial context variables that are needed SwsContext *img_convert_ctx; AVFormatContext* format_ctx = avformat_alloc_context(); AVCodecContext* codec_ctx = NULL; int video_stream_index; // Register everything av_register_all(); avformat_network_init(); //open RTSP if (avformat_open_input(&format_ctx, "http://192.9.200.121/ipcam/mjpeg.cgi";, NULL, NULL) != 0) { return EXIT_FAILURE; } if (avformat_find_stream_info(format_ctx, NULL) < 0) { return EXIT_FAILURE; } //search video stream for (int i = 0; i < format_ctx->nb_streams; i++) { if (format_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) video_stream_index = i; } AVPacket packet; av_init_packet(&packet); //open output file AVFormatContext* output_ctx = avformat_alloc_context(); AVStream* stream = NULL; int cnt = 0; //start reading packets from stream and write them to file av_read_play(format_ctx); //play RTSP // Get the codec AVCodec *codec = NULL; codec = avcodec_find_decoder(AV_CODEC_ID_H264); if (!codec) { exit(1); } // Add this to allocate the context by codec codec_ctx = avcodec_alloc_context3(codec); avcodec_get_context_defaults3(codec_ctx, codec); avcodec_copy_context(codec_ctx, format_ctx->streams[video_stream_index]->codec); std::ofstream output_file; if (avcodec_open2(codec_ctx, codec, NULL) < 0) exit(1); img_convert_ctx = sws_getContext(codec_ctx->width, codec_ctx->height, codec_ctx->pix_fmt, codec_ctx->width, codec_ctx->height, AV_PIX_FMT_RGB24, SWS_BICUBIC, NULL, NULL, NULL); int size = avpicture_get_size(AV_PIX_FMT_YUV420P, codec_ctx->width, codec_ctx->height); uint8_t* picture_buffer = (uint8_t*) (av_malloc(size)); AVFrame* picture = av_frame_alloc(); AVFrame* picture_rgb = av_frame_alloc(); int size2 = avpicture_get_size(AV_PIX_FMT_RGB24, codec_ctx->width, codec_ctx->height); uint8_t* picture_buffer_2 = (uint8_t*) (av_malloc(size2)); avpicture_fill((AVPicture *) picture, picture_buffer, AV_PIX_FMT_YUV420P, codec_ctx->width, codec_ctx->height); avpicture_fill((AVPicture *) picture_rgb, picture_buffer_2, AV_PIX_FMT_RGB24, codec_ctx->width, codec_ctx->height); while (av_read_frame(format_ctx, &packet) >= 0 && cnt < 1000) { //read ~ 1000 frames std::cout << "1 Frame: " << cnt << std::endl; if (packet.stream_index == video_stream_index) { //packet is video std::cout << "2 Is Video" << std::endl; if (stream == NULL) { //create stream in file std::cout << "3 create stream" << std::endl; stream = avformat_new_stream(output_ctx, format_ctx->streams[video_stream_index]->codec->codec); avcodec_copy_context(stream->codec, format_ctx->streams[video_stream_index]->codec); stream->sample_aspect_ratio = format_ctx->streams[video_stream_index]->codec->sample_aspect_ratio; } int check = 0; packet.stream_index = stream->id; std::cout << "4 decoding" << std::endl; int result = avcodec_decode_video2(codec_ctx, picture, &check, &packet); std::cout << "Bytes decoded " << result << " check " << check << std::endl; if (cnt > 100) //cnt < 0) { sws_scale(img_convert_ctx, picture->data, picture->linesize, 0, codec_ctx->height, picture_rgb->data, picture_rgb->linesize); std::stringstream file_name; file_name << "test" << cnt << ".ppm"; output_file.open(file_name.str().c_str()); output_file << "P3 " << codec_ctx->width << " " << codec_ctx->height << " 255\n"; for (int y = 0; y < codec_ctx->height; y++) { for (int x = 0; x < codec_ctx->width * 3; x++) output_file << (int) (picture_rgb->data[0] + y * picture_rgb->linesize[0])[x] << " "; } output_file.close(); } cnt++; } av_free_packet(&packet); av_init_packet(&packet); } av_free(picture); av_free(picture_rgb); av_free(picture_buffer); av_free(picture_buffer_2); av_read_pause(format_ctx); avio_close(output_ctx->pb); avformat_free_context(output_ctx); return (EXIT_SUCCESS); } _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
