[x264-devel] Problem on using x264_encoder_encode

[Alessandro Ferrari]

Hi dear community,
                             I have a problem with the encoding using x264.
After I call x264_encoder_encode( h, &nal, &i_nal, pic, &pic_out)  function
I have nal= NULL, i_nal=0 and the function return 0. I'm sure that pic
contain the correct image. The x264_t h is open using the default
parameters, i only change width and length of the video. The function don't
give me any error, it seems that it not encode any data. I include the code
of encoding function that I implement watching x264.c.

void MyFunction()
{
    x264_param_t param;
        x264_t *h;
    x264_picture_t pic;

    //Set the default parameters
    x264_param_default( &param );

    //Video settings
    param->i_width = WIDTH;
    param->i_height = HEIGHT;

    //Open the encoder
    if( ( h = x264_encoder_open( &param ) ) == NULL )
    {
           fprintf( stderr, "x264 [error]: x264_encoder_open failed\n" );
           return -1;
    }

    /* Create a new pic */
    x264_picture_alloc( &pic, X264_CSP_I420, param.i_width, param.i_height
);

    //Launch the encode routine
    Encode_frame( h , &pic );

    //Release resoirce
    x264_picture_clean( &pic );
    x264_encoder_close(h);
}

int Encode_frame( x264_t *h , x264_picture_t *pic)
{
        x264_nal_t *nal;
        int i_nal, i;
        x264_picture_t pic_out;
        static int mux_buffer_size = 0;
        uint8_t *mux_buffer = NULL;
        int size;

        //Set YUV420
        pic->img.i_csp = X264_CSP_I420;
        pic->img.i_plane = 3;

        //I take the YUV image from a decoded image decode with ffmpeg
        if (picture) {
            for(i = 0; i < 3; i++){
                pic->img.plane[i] = picture->data[i];
                pic->img.i_stride[i] = picture->linesize[i];
            }

            pic->i_pts = picture->pts;
            pic->i_type = X264_TYPE_AUTO;
        }

        //pic contains the correct image.
        if( (i = x264_encoder_encode( h, &nal, &i_nal, pic, &pic_out)) <0)
            return -1;

        /*
         *   In this point nal is null, i_nal is 0. There isn't any error
message in the routine.
         *   As consequence the next loop don't execute any step.
         */


        //packetize the encoded information in nal unit
        for( i = 0; i < i_nal; i++ )
        {
            int i_size;

            printf("\nNal unit n° %d",i);

            if( mux_buffer_size < nal[i].i_payload * 3/2 + 4 )
               {
                    mux_buffer_size = nal[i].i_payload * 2 + 4;
                    free( (void*) mux_buffer );
                    mux_buffer = (uint8_t*) malloc( mux_buffer_size );
            }

            size = size + mux_buffer_size;
            i_size = mux_buffer_size;
            x264_nal_encode( mux_buffer, &i_size, 1, &nal[i] );
            write_nal_unit( mux_buffer , i_size ,"outframe.mpeg4" );
        }

    return size;
}

I'm excuse in advance. I'm not sure that is the correct mailing list (if not
is very appreciated if suggest me what mailing list is the right).
Many thanks.
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