小编koc*_*kov的帖子

我通过libavcodec解码视频,使用以下代码:

//Open input file
if(avformat_open_input(&ctx, filename, NULL, NULL)!=0)
    return FALSE; // Couldn't open file
if(avformat_find_stream_info(ctx, NULL)<0)
    return FALSE; // Couldn't find stream information
videoStream = -1;
//find video stream
for(i=0; i<ctx->nb_streams; i++)
{       
    if((ctx->streams[i])->codec->codec_type==AVMEDIA_TYPE_VIDEO)
    {
        videoStream=i;
        break;
    }
}
if (videoStream == -1)
    return FALSE; // Didn't find a video stream
video_codec_ctx=ctx->streams[videoStream]->codec;
//find decoder
video_codec=avcodec_find_decoder(video_codec_ctx->codec_id);
if(video_codec==NULL)
    return FALSE; // Codec not found
if(avcodec_open(video_codec_ctx, video_codec)<0)
    return -1; // Could not open codec
video_frame=avcodec_alloc_frame();
scaled_frame=avcodec_alloc_frame();
static struct SwsContext *img_convert_ctx; 
if(img_convert_ctx == NULL) …