ffmpeg新旧对照一览表
程序员文章站
2022-07-02 10:31:28
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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:
//got_picture_ptr Zero if no frame could be decompressed
ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
new:
ret = avcodec_send_packet(pCodecCtx, packet);
//got_picture = 0 success, a frame was returned
got_picture = avcodec_receive_frame(pCodecCtx, pFrame);
//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
}
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