ffmpeg新旧API对比

2021-03-02 06:27

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标签:ict   nes   方式   com   amp   could   lib   size   vco   

从FFmpeg 3.0 开始 , 使用了很多新接口, 在一些基本用法上,编译会看见很多的warning,类似 “ warning: ‘AVStream::codec’ is deprecated (declared at /usr/local/ffmpeg/include/libavformat/avformat.h:880) [-Wdeprecated-declarations] out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;”

1. avcodec_decode_video2() 原本的解码函数被拆解为两个函数avcodec_send_packet()和avcodec_receive_frame() 具体用法如下:

old:

avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, pPacket);

new:

avcodec_send_packet(pCodecCtx, pPacket); avcodec_receive_frame(pCodecCtx, pFrame);


2. avcodec_encode_video2() 对应的编码函数也被拆分为两个函数avcodec_send_frame()和avcodec_receive_packet() 具体用法如下:

old:

avcodec_encode_video2(pCodecCtx, pPacket, pFrame, &got_picture);

new:

avcodec_send_frame(pCodecCtx, pFrame); avcodec_receive_packet(pCodecCtx, pPacket);


3. avpicture_get_size() 现在改为使用av_image_get_size() 具体用法如下:

old:

avpicture_get_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);

new: //最后一个参数align这里是置1的,具体看情况是否需要置1

av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height, 1);

4. avpicture_fill() 现在改为使用av_image_fill_arrays 具体用法如下:

old:

avpicture_fill((AVPicture *)pFrame, buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);

new: //最后一个参数align这里是置1的,具体看情况是否需要置1

av_image_fill_arrays(pFrame->data, pFrame->linesize, buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,1);

5. 关于codec问题有的可以直接改为codecpar,但有的时候这样这样是不对的,所以我也还在探索,这里记录一个对pCodecCtx和pCodec赋值方式的改变

old:

pCodecCtx = pFormatCtx->streams[video_index]->codec; pCodec = avcodec_find_decoder(pFormatCtx->streams[video_index]->codec->codec_id);

new:

pCodecCtx = avcodec_alloc_context3(NULL); avcodec_parameters_to_context(pCodecCtx,pFormatCtx->streams[video_index]->codecpar); pCodec = avcodec_find_decoder(pCodecCtx->codec_id);


6. PIX_FMT_YUV420P -> AV_PIX_FMT_YUV420P

7. ‘AVStream::codec‘: 被声明为已否决:

old:

if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){

new:

if(pFormatCtx->streams[i]->codecpar->codec_type==AVMEDIA_TYPE_VIDEO){

8. ‘AVStream::codec‘: 被声明为已否决:

old:

pCodecCtx = pFormatCtx->streams[videoindex]->codec;

new:

pCodecCtx = avcodec_alloc_context3(NULL); avcodec_parameters_to_context(pCodecCtx, pFormatCtx->streams[videoindex]->codecpar);

9. ‘avpicture_get_size‘: 被声明为已否决:

old:

avpicture_get_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height)

new:

#include "libavutil/imgutils.h"

av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height, 1)

10. ‘avpicture_fill‘: 被声明为已否决:

old:

avpicture_fill((AVPicture *)pFrameYUV, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);

new:

av_image_fill_arrays(pFrameYUV->data, pFrameYUV->linesize, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height, 1);

11. ‘avcodec_decode_video2‘: 被声明为已否决:

old:

ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet); //got_picture_ptr Zero if no frame could be decompressed

new:

ret = avcodec_send_packet(pCodecCtx, packet);

got_picture = avcodec_receive_frame(pCodecCtx, pFrame); //got_picture = 0 success, a frame was returned //注意:got_picture含义相反

或者:

int ret = avcodec_send_packet(aCodecCtx, &pkt);

if (ret != 0)

{

prinitf("%s/n","error");

return;

} while( avcodec_receive_frame(aCodecCtx, &frame) == 0)

{

//读取到一帧音频或者视频 //处理解码后音视频 frame

}
12. ‘av_free_packet‘: 被声明为已否决:

old:

av_free_packet(packet);

new:

av_packet_unref(packet);
13. avcodec_decode_audio4:被声明为已否决:

old:

result = avcodec_decode_audio4(dec_ctx, out_frame, &got_output, &enc_pkt);
new:

int ret = avcodec_send_packet(dec_ctx, &enc_pkt);

if (ret != 0)

{

prinitf("%s/n","error");

} while( avcodec_receive_frame(dec_ctx, &out_frame) == 0)

{

//读取到一帧音频或者视频

//处理解码后音视频 frame

}

ffmpeg新旧API对比

标签:ict   nes   方式   com   amp   could   lib   size   vco   

原文地址:https://www.cnblogs.com/dragon2012/p/13066923.html


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