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  • Anomalie #4775 (Fermé) : warning en php 8 avant l’installation

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    Hello :)

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    Télécharger

  • libx264 encoded video lags by few seconds in comparison to audio

    18 septembre 2017, par Herdesh Verma

    Below is the code i am using for reading a .3gp file encoding it using libx264 and writing it to .mp4 container. Code is working but when i play .mp4 file then video is not in sync with audio. Video is few second slow in comparison to audio.

    // Read all packet from context
    
while( av_read_frame( fmt_ctx , pAVPacket ) >= 0 )
    
{
    
    int decoded = pAVPacket->size;
    
    if(pAVPacket->stream_index == video_stream_idx)
    
    {
    
        //decode packet
    
        value = avcodec_decode_video2(video_dec_ctx , pAVFrame , 
    
        &amp;frameFinished , pAVPacket );
    
        if( value &lt; 0)
    
        {
    
            av_free_packet(pAVPacket);
    
            return -1;
    
        }
    

    
        if(frameFinished)// Frame successfully decoded :)
    
        {
    
            sws_scale(swsCtx_, (const uint8_t *const *) pAVFrame->data, 
    
            pAVFrame->linesize, 0, video_dec_ctx->height, outFrame->data, 
    
            outFrame->linesize);
    
            av_init_packet(&amp;outPacket);
    
            outPacket.data = NULL;    // packet data will be allocated by 
    
            the encoder
    
            outPacket.size = 0;
    

    
            outFrame->pts=z;
    
            //encode frame
    
            avcodec_encode_video2(outAVCodecContext , &amp;outPacket ,outFrame , 
    
            &amp;got_picture);
    

    

    
            if(got_picture)
    
            {
    
                if(outPacket.pts != AV_NOPTS_VALUE)
    
                    outPacket.pts = av_rescale_q(outPacket.pts, video_st-
    
                    >codec->time_base, video_st->time_base);
    
                if(outPacket.dts != AV_NOPTS_VALUE)
    
                    outPacket.dts = av_rescale_q(outPacket.dts, video_st-
    
                    >codec->time_base, video_st->time_base);
    

    
                //Write encoded packet to file.
    
                if(av_write_frame(outAVFormatContext , &amp;outPacket) != 0)
    
                {
    
                    av_free_packet(pAVPacket);
    
                    av_free_packet(&amp;outPacket);
    
                    return -1;
    
                }
    
                z++;
    
                av_free_packet(&amp;outPacket);
    
            } // got_picture
    
        } // got_picture
    
    }
    
    // If packet is from audio stream
    
    else if (pAVPacket->stream_index == audio_stream_idx)
    
    {
    
       //Write to file without decoding and encoding it
    
       if(av_write_frame(outAVFormatContext , pAVPacket) != 0)
    
        {
    
        }
    
    }
    
    av_free_packet(pAVPacket);
    
    //z++;
    
}// End of while-loop
    

    
value = av_write_trailer(outAVFormatContext);
    
if( value &lt; 0)
    
{
    
    return -1;
    
}

    I am using below settings :

            outAVCodecContext->codec_id = AV_CODEC_ID_H264;// AV_CODEC_ID_MPEG4; // AV_CODEC_ID_H264 // AV_CODEC_ID_MPEG1VIDEO
    
    outAVCodecContext->bit_rate_tolerance = BIT_RATE_TOLERANT;
    
    outAVCodecContext->rc_max_rate = RC_MAX_RATE;
    
    outAVCodecContext->rc_buffer_size = RC_BUFFER_SIZE;
    
    outAVCodecContext->gop_size = GOP_SIZE;
    
    outAVCodecContext->b_frame_strategy = B_FRAME_STRATEGY;
    
    outAVCodecContext->coder_type = CODER_TYPE;
    
    outAVCodecContext->me_cmp = ME_CMP;
    
    outAVCodecContext->me_range = ME_RANGE; //16
    
    outAVCodecContext->qmin = QMIN;  //10
    
    outAVCodecContext->qmax = QMAX;  //51
    
    outAVCodecContext->scenechange_threshold = SCENECHANGE_THRESHOLD; //40
    
    outAVCodecContext->flags |= CODEC_FLAG_LOOP_FILTER;
    
    outAVCodecContext->me_method = ME_METHOD;
    
    outAVCodecContext->me_subpel_quality = ME_SUBPEL_QUALITY;
    
    outAVCodecContext->i_quant_factor = I_QUANT_FACTOR; //0.71
    
    outAVCodecContext->qcompress = QCOMPRESS;
    
    outAVCodecContext->max_qdiff = MAX_QDIFF;
    
    av_dict_set( &amp;codec_options, "preset", "superfast", 0 );

    And values are defined as below :

    #define VAVLON_VALUES_H
    
#define BIT_RATE_TOLERANT 0;
    
#define RC_MAX_RATE 0;
    
#define RC_BUFFER_SIZE 0;
    
#define GOP_SIZE 40;
    
#define B_FRAME_STRATEGY 0;
    
#define CODER_TYPE 1;
    
#define ME_CMP 1;
    
#define ME_RANGE 16; //16
    
#define QMIN 30;  //37
    
#define QMAX 40;  //70
    
#define SCENECHANGE_THRESHOLD 40; //40
    
#define ME_METHOD ME_HEX;
    
#define ME_SUBPEL_QUALITY 40;
    
#define I_QUANT_FACTOR 0.71;
    
#define QCOMPRESS 0.3;
    
#define MAX_QDIFF 4;
    
#define BIT_RATE 500000;
    
#define CODEC_TYPE AVMEDIA_TYPE_VIDEO;
    
#define PIX_FMT AV_PIX_FMT_YUV420P;
    
#define MAX_B_FRAMES 0;
    
#define NUM 1;
    
#define DEN 30;

    Above code works as expected when i am encoding .mp4 file but i notice lag in video when i try to encode .3gp file.
    Can you please help in finding out what i am doing wrong ?

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