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  • Add white noise to audio stream at specific time stamp for specific duration using FFMPEG

    25 mai 2022, par cpron

    I have a video.mov file of 1 minute. What I want is to make the volume of the current audio stream to 0 for a specific duration and add noise at that specific timestamp.

    


    ffmpeg -y -i video.mov -filter_complex volume=enable='between(t,15,20)':volume=0[main];anoisesrc=d=5:c=pink:r=44100:a=0.5[noise];[main][noise]amix=inputs=2


    


    Thank you in advance.

    


  • FFMPEG : Can not free AVPacket when decode H264 stream ?

    13 janvier 2016, par TTGroup

    I’m using FFMPEG to decode H264 stream, my code is below

    AVFormatContext *pFormatCtx = NULL;
    
AVCodecContext  *pCodecCtx = NULL;
    
AVFrame         *pFrame = NULL;
    
AVPacket        packet;
    
packet.data = NULL;
    

    
pFormatCtx = avformat_alloc_context();  
    
avformat_open_input(&pFormatCtx, videoStreamPath, NULL, NULL);
    
liveHeader.pCodecCtx = pFormatCtx->streams[videoStreamIndex]->codec;
    

    
int  bytesDecoded = 0;
    
int  frameFinished = 0;
    
while (true)
    
{
    
    while (packet.size > 0)
    
    {
    
        // Decode the next chunk of data
    
        bytesDecoded = avcodec_decode_video2(pCodecCtx, pFrame,
    
            &frameFinished, &packet);
    

    
        // Was there an error?
    
        if (bytesDecoded < 0)
    
        {
    
            printf(strErr, "Error while decoding frame\n");
    
            commonGlobal->WriteRuntimeRecLogs(strErr);
    
            return RS_NOT_OK;
    
        }
    

    
        packet.size -= bytesDecoded;
    
        packet.data += bytesDecoded;
    
        if (frameFinished)
    
        {               
    
            //av_free_packet(&packet); //(free 1)
    
            return RS_OK;
    
        }
    
        // Did we finish the current frame? Then we can return
    
    }
    
    do
    
    {
    
        try
    
        {
    
            int ret = av_read_frame(pFormatCtx, &packet);
    
            if (ret < 0)
    
            {
    
                char strErr[STR_LENGTH_256];
    
                if (ret == AVERROR_EOF || (pFormatCtx->pb && pFormatCtx->pb->eof_reached))
    
                {
    
                    sprintf(strErr, "Error end of file line %d", __LINE__);
    
                }
    
                if (pFormatCtx->pb && pFormatCtx->pb->error)
    
                {
    
                    sprintf(strErr, "Error end of file line %d", __LINE__);
    
                }
    
                packet.data = NULL;
    
                return RS_NOT_OK;
    
            }
    
        }
    
        catch (...)
    
        {
    
            packet.data = NULL;
    
            return RS_NOT_OK;
    
        }
    
    } while (packet.stream_index != videoStreamIndex);
    
}
    

    
//av_free_packet(&packet); //(free 2)

    The problem is I don’t know how to free memory of packet correctly.

    I have tried to delete packet’s data by calling one of two places av_free_packet(&packet); (free 1) and av_free_packet(&packet); (free 2). And the result is the application was crashed with the message "Heap Corruption..."

    If I do not free the packet, the memory leak is occur.

    Note that the above code is successful when decode H264 stream, the main problem is memory leak and crashed when I try to free the packet

    Someone can show me the problems in my code.

    Many thanks,

    T&T

  • Revision 31286 : flag_gz detecte quand on en a besoin (suite de ...

    2 septembre 2009, par fil@… — Log

    flag_gz detecte quand on en a besoin (suite de ​http://trac.rezo.net/trac/spip/changeset/14451 )

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