How to silent the MP3 decoding process - c

Question

I am learning ffmpeg and I made a MP3 decoder but when I am executing it , some kind of information is printing on my terminal but I don't want it. So how to silent it ?
Here is code (full code)
/* FFmpeg Usage Example
* Date : 28 July 2019
*/
#include <stdio.h>
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libavutil/avutil.h>
#include <assert.h>
int decode_packet(AVCodecContext*, AVPacket*, AVFrame*);
int main(void) {
AVFormatContext *pFormatContext = avformat_alloc_context();
AVCodecParameters *pCodecParameters = NULL;
if(avformat_open_input(&pFormatContext,"song.mp3",NULL,NULL)!=0) {
fprintf(stderr,"Could not open file\n");
return -1;
}
if(avformat_find_stream_info(pFormatContext,NULL)<0) {
fprintf(stderr,"Could not find stream\n");
return -1;
}
size_t stream_index = 0;
for(;stream_index<pFormatContext->nb_streams;stream_index++) {
if(pFormatContext->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
pCodecParameters = pFormatContext->streams[stream_index]->codecpar;
}
break;
}
if(stream_index == -1) {
fprintf(stderr,"could not retrive stream info from file\n");
return -1;
}
AVStream *stream = pFormatContext->streams[stream_index];
pCodecParameters = stream->codecpar;
AVCodec *cdc = avcodec_find_decoder(pCodecParameters->codec_id);
AVCodecContext *cdc_ctx = avcodec_alloc_context3(cdc);
assert(pCodecParameters);
if(avcodec_parameters_to_context(cdc_ctx,pCodecParameters) < 0) {
fprintf(stderr,"Can't copy params to codec context\n");
return -1;
}
if(avcodec_open2(cdc_ctx,cdc,NULL) < 0) {
fprintf(stderr,"Failed to open decoder for stream\n");
return -1;
}
AVFrame *frame = av_frame_alloc();
if(!frame) {
fprintf(stderr,"could not allocate memory for frame\n");
return -1;
}
AVPacket *packet = av_packet_alloc();
// av_init_packet(&packet);
if(!packet) {
fprintf(stderr,"could not allocate memory for packet");
return -1;
}
packet->data=NULL;
packet->size=0;
// lets read the packets
while(av_read_frame(pFormatContext,packet) >= 0) {
if(packet->stream_index==stream_index) {
int response = 0 ;
response = decode_packet(cdc_ctx,packet,frame);
if(response < 0)
continue;
}
av_packet_unref(packet);
}
return 0;
}
int decode_packet(AVCodecContext *cdc_ctx , AVPacket *pkt, AVFrame *frm) {
int response = avcodec_send_packet(cdc_ctx,pkt);
if(response < 0)
return response;
while(response >= 0) {
response = avcodec_receive_frame(cdc_ctx,frm);
if(response == AVERROR(EAGAIN) || response == AVERROR_EOF)
return -1;
else if(response < 0)
return response;
}
return 0;
}
Expected behaviour : nothing should be printed on screen
Actual behaviour : some kind of logs are printing automatically
Here is output logs ( some of them )
[mp3float # 0x75172e7400] overread, skip -6 enddists: -5 -5
[mp3float # 0x75172e7400] overread, skip -7 enddists: -6 -6
[mp3float # 0x75172e7400] overread, skip -6 enddists: -5 -5
[mp3float # 0x75172e7400] overread, skip -6 enddists: -4 -4

Answer 1

Set the log level to AV_LOG_QUIET. The function prototypes are in libavutil/log.h