simplest_ffmpeg_video_encoder_pu(新版ffmpeg接口+libx265)

87 阅读 0 评论 58 点赞

我是靠谱客的博主负责鸵鸟，最近开发中收集的这篇文章主要介绍simplest_ffmpeg_video_encoder_pu(新版ffmpeg接口+libx265)，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

参考雷神的例子（https://blog.csdn.net/leixiaohua1020/article/details/25430425）改成了新版的ffmpeg接口，.

av_dict_set(&param, "preset", "slow", 0); &param网站转码存在问题。

大部分问题参考了https://blog.csdn.net/Jason_er/article/details/102745442

flush函数也是类似的方法，刚刚开始研究ffmpeg 也不知道改的对不对。欢迎大家留言指正

flush函数还是有问题，直接屏蔽了。

参考了https://www.cnblogs.com/yinxiangpei/articles/3891827.html 解决了掉帧的问题

解决libx265的问题参考了https://blog.csdn.net/guoyunfei123/article/details/105611539

cannot find libx265 encoder的问题坑了几天，找了最新版的20200510的库，控制台有详细信息才找到上面博主的文章。

/**
* 最简单的基于FFmpeg的视频编码器
* Simplest FFmpeg Video Encoder
*
* 雷霄骅 Lei Xiaohua
* leixiaohua1020@126.com
* 中国传媒大学/数字电视技术
* Communication University of China / Digital TV Technology
* http://blog.csdn.net/leixiaohua1020
*
* 本程序实现了YUV像素数据编码为视频码流（HEVC(H.265)，H264，MPEG2，VP8等等）。
* 是最简单的FFmpeg视频编码方面的教程。
* 通过学习本例子可以了解FFmpeg的编码流程。
* This software encode YUV420P data to HEVC(H.265) bitstream (or
* H.264, MPEG2, VP8 etc.).
* It's the simplest video encoding software based on FFmpeg.
* Suitable for beginner of FFmpeg
*/
#include <stdio.h>
extern "C"
{
#include "libavutilopt.h"
#include "libavcodecavcodec.h"
#include "libavformatavformat.h"
#include "libswscaleswscale.h"
#include "libavutilimgutils.h"
};
//
//int flush_encoder(AVFormatContext *fmt_ctx, unsigned int stream_index)
//{
//	int ret;
//	int got_frame;
//	AVPacket enc_pkt;
//	if (!(fmt_ctx->streams[stream_index]->codec->codec->capabilities &
//
AV_CODEC_CAP_DELAY))
//
return 0;
//	while (1) {
//
printf("Flushing stream #%u encodern", stream_index);
//
//ret = encode_write_frame(NULL, stream_index, &got_frame);
//
enc_pkt.data = NULL;
//
enc_pkt.size = 0;
//
av_init_packet(&enc_pkt);
//
ret = avcodec_encode_video2(fmt_ctx->streams[stream_index]->codec, &enc_pkt,
//
NULL, &got_frame);
//
av_frame_free(NULL);
//
if (ret < 0)
//
break;
//
if (!got_frame) {
//
ret = 0;
//
break;
//
}
//
printf("Succeed to encode 1 frame! 编码成功1帧！n");
//
/* mux encoded frame */
//
ret = av_write_frame(fmt_ctx, &enc_pkt);
//
if (ret < 0)
//
break;
//	}
//	return ret;
//}
//int flush_encoder(AVFormatContext *fmt_ctx, AVCodecContext *pCodecCtx, unsigned int stream_index) {
//	int ret;
//	int got_frame;
//	AVPacket enc_pkt;
//	// 用于查找FFmpeg的解码器（参考FFmpeg解码流程图）
//	AVCodec* pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
//	if (pCodec == NULL) {
//
printf("Codec not found.n");
//
return -1;
//	}
//	if (!(pCodec->capabilities & AV_CODEC_CAP_DELAY))
//
return 0;
//
//	while (1) {
//
enc_pkt.data = NULL;
//
enc_pkt.size = 0;
//
av_init_packet(&enc_pkt);
//
//ret = avcodec_encode_video2(pCodecCtx, &enc_pkt,NULL, &got_frame);
//
ret = avcodec_send_frame(pCodecCtx, NULL);
//
got_frame = avcodec_receive_packet(pCodecCtx, &enc_pkt);
//
if (ret < 0)
//
{
//
ret = 0;
//
break;
//
}
//
//
if (got_frame != 0) {
//
ret = 0;
//
break;
//
}
//
printf("Flush Encoder: Succeed to encode 1 frame!tsize:%5dn", enc_pkt.size);
//
/* mux encoded frame */
//
ret = av_write_frame(fmt_ctx, &enc_pkt);
//
if (ret < 0)
//
break;
//
//
av_frame_free(NULL);
//	}
//	return ret;
//}
int main(int argc, char* argv[])
{
AVFormatContext* pFormatCtx;
AVOutputFormat* fmt;
AVStream* video_st;
AVCodecContext* pCodecCtx;
AVCodec* pCodec;
uint8_t* picture_buf;
AVFrame* picture;
int size;
//FILE *in_file = fopen("src01_480x272.yuv", "rb");	//Input YUV data 视频YUV源文件
FILE *in_file;
fopen_s(&in_file, "d:/ds_480x272.yuv", "rb");	//Input YUV data 视频YUV源文件
int in_w = 480, in_h = 272;//宽高
//Frames to encode
int framenum = 100;
//const char* out_file = "src01.h264";	//Output Filepath 输出文件路径
//const char* out_file = "src01.ts";
//const char* out_file = "src01.hevc";
const char* out_file = "d:/ds.hevc";
int ret = -1;
//av_register_all();
//Method1 方法1.组合使用几个函数
//pFormatCtx = avformat_alloc_context();
Guess Format 猜格式
//fmt = av_guess_format(NULL, out_file, NULL);
//pFormatCtx->oformat = fmt;
//Method 2 方法2.更加自动化一些
avformat_alloc_output_context2(&pFormatCtx, NULL, NULL, out_file);
fmt = pFormatCtx->oformat;
//Output Format 注意输出路径
if (avio_open(&pFormatCtx->pb, out_file, AVIO_FLAG_READ_WRITE) < 0)
{
printf("Failed to open output file! 输出文件打开失败");
return -1;
}
video_st = avformat_new_stream(pFormatCtx, NULL);
video_st->time_base.num = 1;
video_st->time_base.den = 25;
if (video_st == NULL)
{
printf("can't allocate new streamn");
return -1;
}
//Param that must set
//pCodecCtx = video_st->codec;
pCodecCtx = avcodec_alloc_context3(NULL);
ret = avcodec_parameters_to_context(pCodecCtx, video_st->codecpar);
//pCodecCtx->codec_id =AV_CODEC_ID_HEVC;
pCodecCtx->codec_id = fmt->video_codec;
pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
pCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
pCodecCtx->width = in_w;
pCodecCtx->height = in_h;
pCodecCtx->time_base.num = 1;
pCodecCtx->time_base.den = 25;
pCodecCtx->bit_rate = 400000;
pCodecCtx->gop_size = 250;
//H264
//pCodecCtx->me_range = 16;
//pCodecCtx->max_qdiff = 4;
//pCodecCtx->qcompress = 0.6;
pCodecCtx->qmin = 10;
pCodecCtx->qmax = 51;
//Optional Param
pCodecCtx->max_b_frames = 3;
// Set Option
AVDictionary *param = NULL;
//H.264
if (pCodecCtx->codec_id == AV_CODEC_ID_H264) {
av_dict_set(&param, "preset", "slow", 0);
av_dict_set(&param, "tune", "zerolatency", 0);
}
//H.265
//解决办法1：关闭B帧
CodecCtx->max_b_frames = 0;
//
//解决办法2：不设置zero-latency
//av_dict_set(&param, "tune", "zero-latency", 0);
if (pCodecCtx->codec_id == AV_CODEC_ID_H265) {
//av_dict_set(&param, "x265-params", "qp=20", 0);
av_dict_set(&param, "preset", "ultrafast", 0);
//av_dict_set(&param, "tune", "zero-latency", 0);
}
//Dump Information 输出格式信息
av_dump_format(pFormatCtx, 0, out_file, 1);
pCodec = avcodec_find_encoder(pCodecCtx->codec_id);
if (!pCodec) {
printf("Can not find encoder! 没有找到合适的编码器！n");
return -1;
}
ret = avcodec_open2(pCodecCtx, pCodec, &param);
if (ret < 0) {
printf("Failed to open encoder! 编码器打开失败！n");
return -1;
}
picture = av_frame_alloc();
//设置帧的格式、宽度和高度，否则会出现
//1.AVFrame.format is not set
//2.AVFrame.width or height is not set
picture->format = pCodecCtx->pix_fmt;
picture->width = pCodecCtx->width;
picture->height = pCodecCtx->height;
size = av_image_get_buffer_size(pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, 1);
picture_buf = (uint8_t *)av_malloc(size);
//avpicture_fill((AVPicture *)picture, picture_buf, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height);
ret = av_image_fill_arrays(picture->data, picture->linesize, picture_buf, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, 1);
//FIX:avformat_write_header return -22
pFormatCtx->streams[0]->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
pFormatCtx->streams[0]->codecpar->width = in_w;
pFormatCtx->streams[0]->codecpar->height = in_h;
//Write File Header 写文件头
ret = avformat_write_header(pFormatCtx, NULL);
AVPacket pkt;
int y_size = pCodecCtx->width * pCodecCtx->height;
av_new_packet(&pkt, y_size * 3);
//fix:lost some frames
int skipped_frame = 0;
for (int i = 0; i<framenum; i++) {
//Read YUV 读入YUV
if (fread(picture_buf, 1, y_size * 3 / 2, in_file) < 0) {
printf("Failed to read YUV data! 文件读取错误n");
return -1;
}
else if (feof(in_file)) {
break;
}
picture->data[0] = picture_buf;
// 亮度Y
picture->data[1] = picture_buf + y_size;
// U
picture->data[2] = picture_buf + y_size * 5 / 4; // V
//PTS
picture->pts = i;
int got_picture = 0;
//Encode 编码
//int ret = avcodec_encode_video2(pCodecCtx, &pkt, picture, &got_picture);
int ret = avcodec_send_frame(pCodecCtx, picture);
got_picture = avcodec_receive_packet(pCodecCtx, &pkt);
if (ret < 0) {
printf("Failed to encode! 编码错误！n");
return -1;
}
if (got_picture == 0) {
printf("Succeed to encode 1 frame! 编码成功1帧！n");
pkt.stream_index = video_st->index;
ret = av_write_frame(pFormatCtx, &pkt);
av_packet_unref(&pkt);
}
else
{
skipped_frame++;
}
}
Flush Encoder
will lost same frames
//ret = flush_encoder(pFormatCtx, pCodecCtx, 0);
//if (ret < 0) {
//	printf("Flushing encoder failedn");
//	return -1;
//}
//Fix: lost frame
for (int i = skipped_frame; i>0; i--)
{
int got_picture = 0;
//Encode
//ret = avcodec_decode_video2(video_dec_ctx, vframe, &got_frame, &packet);
ret = avcodec_send_frame(pCodecCtx, picture);
got_picture = avcodec_receive_packet(pCodecCtx, &pkt);
if (got_picture == 0) {
pkt.pts = av_rescale_q(pkt.pts, pFormatCtx->streams[0]->time_base, pFormatCtx->streams[0]->time_base);
av_write_frame(pFormatCtx, &pkt);
av_packet_unref(&pkt);
}
}
//Write file trailer 写文件尾
av_write_trailer(pFormatCtx);
//Clean 清理
if (video_st) {
avcodec_close(pCodecCtx);
av_free(picture);
av_free(picture_buf);
}
avio_close(pFormatCtx->pb);
avformat_free_context(pFormatCtx);
fclose(in_file);
system("pause");
return 0;
}