[FFmpeg-user] Error read format to my program.
ABDALLAH Moussa
Moussa.ABDALLAH at nexeya.com
Fri Feb 22 18:19:01 EET 2019
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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