[FFmpeg-user] Error read format to my program.
ABDALLAH Moussa
Moussa.ABDALLAH at nexeya.com
Sun Feb 24 12:23:53 EET 2019
Up
> Le 22 févr. 2019 à 17:19, ABDALLAH Moussa <Moussa.ABDALLAH at nexeya.com> a écrit :
>
> 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 at 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 at 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 at 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 at 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);
> }
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