unsignedintnb_streams; /** * A list of all streams in the file. New streams are created with * avformat_new_stream(). * * - demuxing: streams are created by libavformat in avformat_open_input(). * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also * appear in ...
const codec_list[]数组。 在libavcodec/allcodecs.c将static const AVCodec * const codec_list[]的编解码器用链表的方式组织起来。 Ffmpeg 4.0.2 组件注册方式 FFmepg内部去做,不需要用户调用API去注册。 对于demuxer/muxer(解复用器,也称容器)则对应 libavformat/muxer_list.c libavformat/demuxer_list.c 这...
AVIOContext*pb;// I/O context.自定义格式读或者从内存读可用char filename[1024];// input or output filename/** * Number of elements in AVFormatContext.streams. */unsigned int nb_streams;// 流的数量/** * A list of all streams in the file. New streams are created with * avformat_new...
2 . 结构体元素 : 音视频流结构体 AVStream 存储在 AVFormatContext *formatContext 结构体中 的 AVStream **streams 元素中 , 这是一个 AVStream 结构体指针数组 ; /** * A list of all streams in the file. New streams are created with * avformat_new_stream(). * * - ...
unsigned intnb_streams; /** * A list of all streams in the file. New streams are created with * avformat_new_stream(). * * - demuxing: streams are created by libavformat in avformat_open_input(). * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also ...
*/ /** This buffer is only needed when packets were already buffered but not decoded, for example to get the codec parameters in MPEG streams. */ struct AVPacketList *packet_buffer; /** Decoding: position of the first frame of the component, in AV_TIME_BASE fractional seconds. NEVER ...
FFmpeg源代码本身包含了很多的解码支持,解码主要是在输入的时候进行解码,也可以理解为将压缩过的编码进行解压缩,关于解码的支持,可以通过./configure–list-decoders命令来进行查看: aac cdgraphics imm5 nellymoser speedhq aac_at cdtoons indeo2 notchlc speex aac_fixed cdxl indeo3 nuv srgc aac_latm cfhd ...
[1] ffmpeg.org/ffmpeg-all 1. help命令使用 首先我们要学会使用ffmpeg工具提供的最最基本的一个命令:ffmpeg -help。 有了他我们就可以更加愉快地学习使用ffmpeg的各种功能了。 执行ffmpeg -help后,在终端会打印下面的帮助信息: ...
//视频解码，需要找到视频对应的AVStream所在pFormatCtx->streams的索引位置 int video_stream_idx ...
* A list of all streams in the file. New streams are created with * avformat_new_stream(). * * decoding: streams are created by libavformat in avformat_open_input(). * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also ...