avcodec_encode_video2 the memory usage is very high - c

Question

code:
```
#include "pch.h"
#include
extern "C"
{
#ifndef __STDC_CONSTANT_MACROS
#define __STDC_CONSTANT_MACROS
#endif
#include <libavcodec/avcodec.h>
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavutil/avutil.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include <libavutil/rational.h>
//#include "libavutil/avassert.h"
//#include "libavutil/attributes.h"
//#include "libavutil/avassert.h"
//#include "libavutil/frame.h"
//#include "libavutil/imgutils.h"
//#include "internal1.h"
//#include "libavutil/samplefmt.h"
}
#include <vld.h>
//#include "avcodec.h"
//#include "frame_thread_encoder.h"
//#include "internal.h"
// Globals
AVCodec* m_pCodec = NULL;
AVStream *m_pStream = NULL;
AVOutputFormat* m_pFormat = NULL;
AVFormatContext* m_pFormatContext = NULL;
AVCodecContext* m_pCodecContext = NULL;
AVFrame* m_pFrame = NULL;
int m_frameIndex;
// Output format
AVPixelFormat m_pixType = AV_PIX_FMT_NV12;
// Use for mpeg4
//AVPixelFormat m_pixType = AV_PIX_FMT_YUV420P;
// Output frame rate
int m_frameRate = 30;
// Output image dimensions
int m_imageWidth = 256;
int m_imageHeight = 1537;
// Number of frames to export
int m_frameCount = 20000;
// Output file name
const char* m_fileName = "test.h264";
// Output file type
const char* m_fileType = "H264";
// Codec name used to encode
const char* m_encoderName = "h264_qsv";
// use for mpeg4
//const char* m_encoderName = "mpeg4";
// Target bit rate
int m_targetBitRate = 400000;
void addVideoStream()
{
m_pStream = avformat_new_stream(m_pFormatContext, m_pCodec);
m_pStream->id = m_pFormatContext->nb_streams - 1;
m_pStream->time_base = m_pCodecContext->time_base;
m_pStream->codec->pix_fmt = m_pixType;
m_pStream->codec->flags = m_pCodecContext->flags;
m_pStream->codec->width = m_pCodecContext->width;
m_pStream->codec->height = m_pCodecContext->height;
m_pStream->codec->time_base = m_pCodecContext->time_base;
m_pStream->codec->bit_rate = m_pCodecContext->bit_rate;
}
AVFrame* allocatePicture(enum AVPixelFormat pix_fmt, int width, int height)
{
AVFrame *frame;
frame = av_frame_alloc();
if (!frame)
{
return NULL;
}
frame->format = pix_fmt;
frame->width = width;
frame->height = height;
int checkImage = av_image_alloc(frame->data, frame->linesize, width, height, pix_fmt, 32);
if (checkImage < 0)
{
return NULL;
}
return frame;
}
bool initialize()
{
AVRational frameRate;
frameRate.den = m_frameRate;
frameRate.num = 1;
av_register_all();
m_pCodec = avcodec_find_encoder_by_name(m_encoderName);
if (!m_pCodec)
{
return false;
}
m_pCodecContext = avcodec_alloc_context3(m_pCodec);
m_pCodecContext->width = m_imageWidth;
m_pCodecContext->height = m_imageHeight;
m_pCodecContext->time_base = frameRate;
m_pCodecContext->gop_size = 0;
m_pCodecContext->pix_fmt = m_pixType;
m_pCodecContext->codec_id = m_pCodec->id;
m_pCodecContext->bit_rate = m_targetBitRate;
av_opt_set(m_pCodecContext->priv_data, "+CBR", "", 0);
return true;
}
bool startExport()
{
m_frameIndex = 0;
char fakeFileName[512];
int checkAllocContext = avformat_alloc_output_context2(&m_pFormatContext, NULL, m_fileType, fakeFileName);
if (checkAllocContext < 0)
{
return false;
}
if (!m_pFormatContext)
{
return false;
}
m_pFormat = m_pFormatContext->oformat;
if (m_pFormat->video_codec != AV_CODEC_ID_NONE)
{
addVideoStream();
int checkOpen = avcodec_open2(m_pCodecContext, m_pCodec, NULL);
if (checkOpen < 0)
{
return false;
}
m_pFrame = allocatePicture(m_pCodecContext->pix_fmt, m_pCodecContext->width, m_pCodecContext->height);
if (!m_pFrame)
{
return false;
}
m_pFrame->pts = 0;
}
int checkOpen = avio_open(&m_pFormatContext->pb, m_fileName, AVIO_FLAG_WRITE);
if (checkOpen < 0)
{
return false;
}
av_dict_set(&(m_pFormatContext->metadata), "title", "QS Test", 0);
int checkHeader = avformat_write_header(m_pFormatContext, NULL);
if (checkHeader < 0)
{
return false;
}
return true;
}
int processFrame(AVPacket& avPacket)
{
avPacket.stream_index = 0;
avPacket.pts = av_rescale_q(m_pFrame->pts, m_pStream->codec->time_base, m_pStream->time_base);
avPacket.dts = av_rescale_q(m_pFrame->pts, m_pStream->codec->time_base, m_pStream->time_base);
m_pFrame->pts++;
int retVal = av_interleaved_write_frame(m_pFormatContext, &avPacket);
return retVal;
}
bool exportFrame()
{
int success = 1;
int result = 0;
AVPacket avPacket;
av_init_packet(&avPacket);
avPacket.data = NULL;
avPacket.size = 0;
AVPacket* avPacket1 = new AVPacket();
av_init_packet(avPacket1);
avPacket1->data = NULL;
avPacket1->size = 0;
fflush(stdout);
std::cout << "Before avcodec_encode_video2 for frame: " << m_frameIndex << std::endl;
success = avcodec_encode_video2(m_pCodecContext, &avPacket, m_pFrame, &result);
std::cout << "After avcodec_encode_video2 for frame: " << m_frameIndex << std::endl;
if (result)
{
success = processFrame(avPacket);
}
av_packet_unref(&avPacket);
av_free_packet(&avPacket);
//av_frame_free(&m_pFrame);
m_frameIndex++;
return (success == 0);
}
void endExport()
{
int result = 0;
int success = 0;
if (m_pFrame)
{
while (success == 0)
{
AVPacket avPacket;
av_init_packet(&avPacket);
avPacket.data = NULL;
avPacket.size = 0;
fflush(stdout);
success = avcodec_encode_video2(m_pCodecContext, &avPacket, NULL, &result);
if (result)
{
success = processFrame(avPacket);
}
av_packet_unref(&avPacket);
if (!result)
{
break;
}
}
}
if (m_pFormatContext)
{
av_write_trailer(m_pFormatContext);
if (m_pFrame)
{
av_frame_free(&m_pFrame);
}
avio_closep(&m_pFormatContext->pb);
avformat_free_context(m_pFormatContext);
m_pFormatContext = NULL;
}
}
void cleanup()
{
if (m_pFrame || m_pCodecContext)
{
if (m_pFrame)
{
av_frame_free(&m_pFrame);
}
if (m_pCodecContext)
{
avcodec_close(m_pCodecContext);
av_free(m_pCodecContext);
}
}
}
int main()
{
bool success = true;
if (initialize())
{
if (startExport())
{
for (int loop = 0; loop < m_frameCount; loop++)
{
if (!exportFrame())
{
std::cout << "Failed to export frame\n";
success = false;
break;
}
}
endExport();
}
else
{
std::cout << "Failed to start export\n";
success = false;
}
cleanup();
}
else
{
std::cout << "Failed to initialize export\n";
success = false;
}
if (success)
{
std::cout << "Successfully exported file\n";
}
return 1;
}
```
When I set the m_imageHeight to 1536, the memory usage is very high. But when set to 1535 or 1537 or other values, the memory usage is normal, can you tell me why?
I have navigated to avcodec_encode_video2
enter link description here
I am using the code from the link
I have updated to the latest Intel® Graphics Driver