[wbyq@wbyq tiny4412]$ tar xvf /mnt/hgfs/linux-share-dir/x264-master.tar.bz2
[wbyq@wbyq tiny4412]$ cd x264-master/
[wbyq@wbyq x264-master]$ ./configure --prefix=$PWD/_install --disable-asm --enable-shared --enable-static --host=arm-none-linux-gnueabi

[wbyq@wbyq x264-master]$ gedit config.mak 

[wbyq@wbyq x264-master]$ make && make install

[wbyq@wbyq x264-master]$ tree _install/
_install/
├── bin
│   └── x264
├── include
│   ├── x264_config.h
│   └── x264.h
└── lib
    ├── libx264.a
    ├── libx264.so -> libx264.so.160
    ├── libx264.so.160
    └── pkgconfig
        └── x264.pc
 
4 directories, 7 files
[wbyq@wbyq x264-master]$

[wbyq@wbyq ffmpeg-4.2.2]$ ./configure --enable-shared --enable-static --prefix=$PWD/_install --cross-prefix=arm-linux- --arch=arm --target-os=linux --enable-gpl --extra-cflags=-I/home/wbyq/work/tiny4412/x264-master/_install/include --extra-ldflags=-L/home/wbyq/work/tiny4412/x264-master/_install/lib --enable-ffmpeg --enable-libx264
 
[wbyq@wbyq ffmpeg-4.2.2]$ make && make install

[wbyq@wbyq ffmpeg-4.2.2]$ tree _install/
_install/
├── bin
│   ├── ffmpeg
│   └── ffprobe
├── include
│   ├── libavcodec
│   │   ├── ac3_parser.h
│   │   ├── adts_parser.h
│   │   ├── avcodec.h
│   │   ├── avdct.h
│   │   ├── avfft.h
│   │   ├── d3d11va.h
│   │   ├── dirac.h
│   │   ├── dv_profile.h
│   │   ├── dxva2.h
│   │   ├── jni.h
│   │   ├── mediacodec.h
│   │   ├── qsv.h
│   │   ├── vaapi.h
│   │   ├── vdpau.h
│   │   ├── version.h
│   │   ├── videotoolbox.h
│   │   ├── vorbis_parser.h
│   │   └── xvmc.h
│   ├── libavdevice
│   │   ├── avdevice.h
│   │   └── version.h
│   ├── libavfilter
│   │   ├── avfilter.h
│   │   ├── buffersink.h
│   │   ├── buffersrc.h
│   │   └── version.h
│   ├── libavformat
│   │   ├── avformat.h
│   │   ├── avio.h
│   │   └── version.h
│   ├── libavutil
│   │   ├── adler32.h
│   │   ├── aes_ctr.h
│   │   ├── aes.h
│   │   ├── attributes.h
│   │   ├── audio_fifo.h
│   │   ├── avassert.h
│   │   ├── avconfig.h
│   │   ├── avstring.h
│   │   ├── avutil.h
│   │   ├── base64.h
│   │   ├── blowfish.h
│   │   ├── bprint.h
│   │   ├── bswap.h
│   │   ├── buffer.h
│   │   ├── camellia.h
│   │   ├── cast5.h
│   │   ├── channel_layout.h
│   │   ├── common.h
│   │   ├── cpu.h
│   │   ├── crc.h
│   │   ├── des.h
│   │   ├── dict.h
│   │   ├── display.h
│   │   ├── downmix_info.h
│   │   ├── encryption_info.h
│   │   ├── error.h
│   │   ├── eval.h
│   │   ├── ffversion.h
│   │   ├── fifo.h
│   │   ├── file.h
│   │   ├── frame.h
│   │   ├── hash.h
│   │   ├── hdr_dynamic_metadata.h
│   │   ├── hmac.h
│   │   ├── hwcontext_cuda.h
│   │   ├── hwcontext_d3d11va.h
│   │   ├── hwcontext_drm.h
│   │   ├── hwcontext_dxva2.h
│   │   ├── hwcontext.h
│   │   ├── hwcontext_mediacodec.h
│   │   ├── hwcontext_qsv.h
│   │   ├── hwcontext_vaapi.h
│   │   ├── hwcontext_vdpau.h
│   │   ├── hwcontext_videotoolbox.h
│   │   ├── imgutils.h
│   │   ├── intfloat.h
│   │   ├── intreadwrite.h
│   │   ├── lfg.h
│   │   ├── log.h
│   │   ├── lzo.h
│   │   ├── macros.h
│   │   ├── mastering_display_metadata.h
│   │   ├── mathematics.h
│   │   ├── md5.h
│   │   ├── mem.h
│   │   ├── motion_vector.h
│   │   ├── murmur3.h
│   │   ├── opt.h
│   │   ├── parseutils.h
│   │   ├── pixdesc.h
│   │   ├── pixelutils.h
│   │   ├── pixfmt.h
│   │   ├── random_seed.h
│   │   ├── rational.h
│   │   ├── rc4.h
│   │   ├── replaygain.h
│   │   ├── ripemd.h
│   │   ├── samplefmt.h
│   │   ├── sha512.h
│   │   ├── sha.h
│   │   ├── spherical.h
│   │   ├── stereo3d.h
│   │   ├── tea.h
│   │   ├── threadmessage.h
│   │   ├── timecode.h
│   │   ├── time.h
│   │   ├── timestamp.h
│   │   ├── tree.h
│   │   ├── twofish.h
│   │   ├── tx.h
│   │   ├── version.h
│   │   └── xtea.h
│   ├── libpostproc
│   │   ├── postprocess.h
│   │   └── version.h
│   ├── libswresample
│   │   ├── swresample.h
│   │   └── version.h
│   └── libswscale
│       ├── swscale.h
│       └── version.h
├── lib
│   ├── libavcodec.a
│   ├── libavcodec.so -> libavcodec.so.58.54.100
│   ├── libavcodec.so.58 -> libavcodec.so.58.54.100
│   ├── libavcodec.so.58.54.100
│   ├── libavdevice.a
│   ├── libavdevice.so -> libavdevice.so.58.8.100
│   ├── libavdevice.so.58 -> libavdevice.so.58.8.100
│   ├── libavdevice.so.58.8.100
│   ├── libavfilter.a
│   ├── libavfilter.so -> libavfilter.so.7.57.100
│   ├── libavfilter.so.7 -> libavfilter.so.7.57.100
│   ├── libavfilter.so.7.57.100
│   ├── libavformat.a
│   ├── libavformat.so -> libavformat.so.58.29.100
│   ├── libavformat.so.58 -> libavformat.so.58.29.100
│   ├── libavformat.so.58.29.100
│   ├── libavutil.a
│   ├── libavutil.so -> libavutil.so.56.31.100
│   ├── libavutil.so.56 -> libavutil.so.56.31.100
│   ├── libavutil.so.56.31.100
│   ├── libpostproc.a
│   ├── libpostproc.so -> libpostproc.so.55.5.100
│   ├── libpostproc.so.55 -> libpostproc.so.55.5.100
│   ├── libpostproc.so.55.5.100
│   ├── libswresample.a
│   ├── libswresample.so -> libswresample.so.3.5.100
│   ├── libswresample.so.3 -> libswresample.so.3.5.100
│   ├── libswresample.so.3.5.100
│   ├── libswscale.a
│   ├── libswscale.so -> libswscale.so.5.5.100
│   ├── libswscale.so.5 -> libswscale.so.5.5.100
│   ├── libswscale.so.5.5.100
│   └── pkgconfig
│       ├── libavcodec.pc
│       ├── libavdevice.pc
│       ├── libavfilter.pc
│       ├── libavformat.pc
│       ├── libavutil.pc
│       ├── libpostproc.pc
│       ├── libswresample.pc
│       └── libswscale.pc
└── share
    ├── ffmpeg
    │   ├── examples
    │   │   ├── avio_dir_cmd.c
    │   │   ├── avio_reading.c
    │   │   ├── decode_audio.c
    │   │   ├── decode_video.c
    │   │   ├── demuxing_decoding.c
    │   │   ├── encode_audio.c
    │   │   ├── encode_video.c
    │   │   ├── extract_mvs.c
    │   │   ├── filter_audio.c
    │   │   ├── filtering_audio.c
    │   │   ├── filtering_video.c
    │   │   ├── http_multiclient.c
    │   │   ├── hw_decode.c
    │   │   ├── Makefile
    │   │   ├── metadata.c
    │   │   ├── muxing.c
    │   │   ├── qsvdec.c
    │   │   ├── README
    │   │   ├── remuxing.c
    │   │   ├── resampling_audio.c
    │   │   ├── scaling_video.c
    │   │   ├── transcode_aac.c
    │   │   ├── transcoding.c
    │   │   ├── vaapi_encode.c
    │   │   └── vaapi_transcode.c
    │   ├── ffprobe.xsd
    │   ├── libvpx-1080p50_60.ffpreset
    │   ├── libvpx-1080p.ffpreset
    │   ├── libvpx-360p.ffpreset
    │   ├── libvpx-720p50_60.ffpreset
    │   └── libvpx-720p.ffpreset
    └── man
        ├── man1
        │   ├── ffmpeg.1
        │   ├── ffmpeg-all.1
        │   ├── ffmpeg-bitstream-filters.1
        │   ├── ffmpeg-codecs.1
        │   ├── ffmpeg-devices.1
        │   ├── ffmpeg-filters.1
        │   ├── ffmpeg-formats.1
        │   ├── ffmpeg-protocols.1
        │   ├── ffmpeg-resampler.1
        │   ├── ffmpeg-scaler.1
        │   ├── ffmpeg-utils.1
        │   ├── ffprobe.1
        │   └── ffprobe-all.1
        └── man3
            ├── libavcodec.3
            ├── libavdevice.3
            ├── libavfilter.3
            ├── libavformat.3
            ├── libavutil.3
            ├── libswresample.3
            └── libswscale.3
 
18 directories, 208 files
[wbyq@wbyq ffmpeg-4.2.2]$

[wbyq@wbyq tiny4412]$ ls
ffmpeg-4.2.2  x264-master
[wbyq@wbyq tiny4412]$ mkdir run_lib
[wbyq@wbyq tiny4412]$ cd run_lib/
[wbyq@wbyq run_lib]$ cp ../ffmpeg-4.2.2/_install/lib/*.so* ./
[wbyq@wbyq run_lib]$ cp ../x264-master/_install/lib/*.so* ./
[wbyq@wbyq run_lib]$ ls
libavcodec.so            libavfilter.so            libavutil.so             libswresample.so          libx264.so
libavcodec.so.58         libavfilter.so.7          libavutil.so.56          libswresample.so.3        libx264.so.160
libavcodec.so.58.54.100  libavfilter.so.7.57.100   libavutil.so.56.31.100   libswresample.so.3.5.100
libavdevice.so           libavformat.so            libpostproc.so           libswscale.so
libavdevice.so.58        libavformat.so.58         libpostproc.so.55        libswscale.so.5
libavdevice.so.58.8.100  libavformat.so.58.29.100  libpostproc.so.55.5.100  libswscale.so.5.5.100

[root@tiny4412 ]# ls
bin         etc         linuxrc     nfs.sh      root        tmp         work
code        home        lost+found  opt         sbin        usr
dev         lib         mnt         proc        sys         var
[root@tiny4412 ]# ffmpeg 
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 4.5.1 (ctng-1.8.1-FA)
  configuration: --enable-shared --enable-static --prefix=/home/wbyq/work/tiny4412/ffmpeg-4.2.2/_install --cross-prefix=arm-linux- --arch=arm --target-os=linux --enable-gpl --extra-cflags=-I/home/wbyq/work/tiny4412/x264-master/_install/include --extra-ldflags=-L/home/wbyq/work/tiny4412/x264-master/_install/lib --enable-ffmpeg --enable-libx264
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
 
Use -h to get full help or, even better, run 'man ffmpeg'
[root@tiny4412 ]# 

#include <stdlib.h>  
#include <stdio.h>  
#include <string.h>  
#include <math.h>  
#include <libavutil/avassert.h>  
#include <libavutil/channel_layout.h>  
#include <libavutil/opt.h>  
#include <libavutil/mathematics.h>  
#include <libavutil/timestamp.h>  
#include <libavformat/avformat.h>  
#include <libswscale/swscale.h>  
#include <libswresample/swresample.h>  
 
#define STREAM_DURATION   50.0 /*录制视频的持续时间  秒*/
#define STREAM_FRAME_RATE 5     /* images/s  这里可以根据摄像头的采集速度来设置帧率 */
#define STREAM_PIX_FMT    AV_PIX_FMT_YUV420P /* default pix_fmt */  
#define SCALE_FLAGS SWS_BICUBIC  
 
//存放视频的宽度和高度
int video_width;
int video_height;
 
// 单个输出AVStream的包装器 
typedef struct OutputStream
{  
    AVStream *st;  
    AVCodecContext *enc;  
    /*下一帧的点数*/  
    int64_t next_pts;  
    int samples_count;  
    AVFrame *frame;  
    AVFrame *tmp_frame;  
    float t, tincr, tincr2;  
    struct SwsContext *sws_ctx;  
    struct SwrContext *swr_ctx;  
}OutputStream;  
 
 
typedef struct IntputDev
{  
    AVCodecContext  *pCodecCtx;  
    AVCodec         *pCodec;  
    AVFormatContext *v_ifmtCtx;  
    int  videoindex;  
    struct SwsContext *img_convert_ctx;  
    AVPacket *in_packet;  
    AVFrame *pFrame,*pFrameYUV;  
}IntputDev;  
 
static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt)  
{  
    AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base;  
    printf("pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n",  
           av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base),  
           av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base),  
           av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base),  
           pkt->stream_index);  
}  
 
static int write_frame(AVFormatContext *fmt_ctx, const AVRational *time_base, AVStream *st, AVPacket *pkt)  
{  
    /* 将输出数据包时间戳值从编解码器重新调整为流时基 */  
    av_packet_rescale_ts(pkt, *time_base, st->time_base);  
    pkt->stream_index = st->index;  
 
    /*将压缩的帧写入媒体文件。*/  
    log_packet(fmt_ctx, pkt);  
    return av_interleaved_write_frame(fmt_ctx, pkt);  
}  
 
/*添加输出流。 */  
static void add_stream(OutputStream *ost, AVFormatContext *oc,AVCodec **codec,enum AVCodecID codec_id)  
{  
    AVCodecContext *c;  
    int i;  
    /* find the encoder */ 
 
    *codec = avcodec_find_encoder(codec_id);  
    if (!(*codec))
    {  
        fprintf(stderr, "Could not find encoder for '%s'\n",  
                avcodec_get_name(codec_id));  
        exit(1);  
    }  
    ost->st = avformat_new_stream(oc, NULL);  
 
    if (!ost->st) {  
        fprintf(stderr, "Could not allocate stream\n");  
        exit(1);  
    }  
    ost->st->id = oc->nb_streams-1;  
    c = avcodec_alloc_context3(*codec);  
    if (!c) {  
        fprintf(stderr, "Could not alloc an encoding context\n");  
        exit(1);  
    }  
    ost->enc = c;   
    switch((*codec)->type)
    {  
        case AVMEDIA_TYPE_AUDIO:  
            c->sample_fmt  = (*codec)->sample_fmts ?  
                (*codec)->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;  
            c->bit_rate    = 64000;  
            c->sample_rate = 44100;  
            if ((*codec)->supported_samplerates) {  
                c->sample_rate = (*codec)->supported_samplerates[0];  
                for (i = 0; (*codec)->supported_samplerates[i]; i++) {  
                    if ((*codec)->supported_samplerates[i] == 44100)  
                        c->sample_rate = 44100;  
                }  
            }  
            c->channels        = av_get_channel_layout_nb_channels(c->channel_layout);  
            c->channel_layout = AV_CH_LAYOUT_STEREO;  
            if ((*codec)->channel_layouts) {  
                c->channel_layout = (*codec)->channel_layouts[0];  
                for (i = 0; (*codec)->channel_layouts[i]; i++) {  
                    if ((*codec)->channel_layouts[i] == AV_CH_LAYOUT_STEREO)  
                        c->channel_layout = AV_CH_LAYOUT_STEREO;  
                }  
            }  
            c->channels        = av_get_channel_layout_nb_channels(c->channel_layout);  
            ost->st->time_base = (AVRational){ 1, c->sample_rate };  
            break;  
      
        case AVMEDIA_TYPE_VIDEO:  
            c->codec_id = codec_id;  
            c->bit_rate = 2500000;  //平均比特率,例子代码默认值是400000
            /* 分辨率必须是2的倍数。*/  
            c->width=video_width;  
            c->height=video_height;  
            /*时基：这是基本的时间单位（以秒为单位）
             *表示其中的帧时间戳。 对于固定fps内容，
             *时基应为1 /framerate，时间戳增量应为
             *等于1。*/  
            ost->st->time_base = (AVRational){1,STREAM_FRAME_RATE};  //帧率设置
            c->time_base       = ost->st->time_base;  
            c->gop_size      = 12; /* 最多每十二帧发射一帧内帧 */  
            c->pix_fmt       = STREAM_PIX_FMT;  
            if(c->codec_id == AV_CODEC_ID_MPEG2VIDEO)
            {  
                /* 只是为了测试，我们还添加了B帧 */  
                c->max_b_frames = 2;  
            }  
            if(c->codec_id == AV_CODEC_ID_MPEG1VIDEO)
            {  
                /*需要避免使用其中一些系数溢出的宏块。
                 *普通视频不会发生这种情况，因为
                 *色度平面的运动与亮度平面不匹配。 */ 
                c->mb_decision = 2;  
            }   
        break;  
      
        default:  
            break;  
    }  
  
    /* 某些格式希望流头分开。 */  
    if (oc->oformat->flags & AVFMT_GLOBALHEADER)  
        c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;    
}  
 
static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)  
{  
    AVFrame *picture;  
    int ret;  
    picture = av_frame_alloc();  
    if (!picture)  
        return NULL;  
    picture->format = pix_fmt;  
    picture->width  = width;  
    picture->height = height;  
  
    /* 为帧数据分配缓冲区 */  
    ret = av_frame_get_buffer(picture, 32);  
    if(ret<0)
    {  
        fprintf(stderr, "Could not allocate frame data.\n");  
        exit(1);  
    }  
    return picture;  
}  
  
static void open_video(AVFormatContext *oc, AVCodec *codec, OutputStream *ost, AVDictionary *opt_arg)  
{  
    int ret;  
    AVCodecContext *c = ost->enc;  
    AVDictionary *opt = NULL;  
  
    av_dict_copy(&opt, opt_arg, 0);  
  
    /* open the codec */  
    ret = avcodec_open2(c, codec, &opt);  
    av_dict_free(&opt);  
    if (ret < 0)
    {  
        fprintf(stderr, "Could not open video codec: %s\n", av_err2str(ret));  
        exit(1);  
    }  
  
    /* 分配并初始化可重用框架 */  
    ost->frame = alloc_picture(c->pix_fmt, c->width, c->height);  
    if (!ost->frame)
    {  
        fprintf(stderr, "Could not allocate video frame\n");  
        exit(1);  
    }  
    printf("ost->frame alloc success fmt=%d w=%d h=%d\n",c->pix_fmt,c->width, c->height);  
  
  
    /*如果输出格式不是YUV420P，则为临时YUV420P
    *也需要图片。 然后将其转换为所需的
    *输出格式。 */
    ost->tmp_frame = NULL;  
    if(c->pix_fmt != AV_PIX_FMT_YUV420P)
    {  
        ost->tmp_frame = alloc_picture(AV_PIX_FMT_YUV420P, c->width, c->height);  
        if (!ost->tmp_frame)
        {  
            fprintf(stderr, "Could not allocate temporary picture\n");  
            exit(1);  
        }  
    }  
  
    /* 将流参数复制到多路复用器*/  
    ret=avcodec_parameters_from_context(ost->st->codecpar, c);  
    if(ret<0)
    {  
        fprintf(stderr, "Could not copy the stream parameters\n");  
        exit(1);  
    }  
}
 
/*
  *编码一个视频帧
  *编码完成后返回1，否则返回0
  */  
static int write_video_frame(AVFormatContext *oc, OutputStream *ost,AVFrame *frame)  
{  
    int ret;  
    AVCodecContext *c;  
    int got_packet=0;  
    AVPacket pkt={0};  
    if(frame==NULL)  
        return 1;  
    c = ost->enc;  
    av_init_packet(&pkt);  
    /* 编码图像*/  
    ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);  
    if(ret<0)
    {  
        fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));  
        exit(1);  
    }  
    printf("--------------video- pkt.pts=%s\n",av_ts2str(pkt.pts));  
    printf("----st.num=%d st.den=%d codec.num=%d codec.den=%d---------\n",ost->st->time_base.num,ost->st->time_base.den,  
            c->time_base.num,c->time_base.den);         
    if(got_packet)
    {  
        ret = write_frame(oc, &c->time_base, ost->st, &pkt);  
    }else
    {  
        ret = 0;  
    }  
    if(ret<0)
    {  
        fprintf(stderr, "Error while writing video frame: %s\n", av_err2str(ret));  
        exit(1);  
    }  
    return (frame || got_packet) ? 0 : 1;  
}  
  
  
static AVFrame *get_video_frame(OutputStream *ost,IntputDev* input,int *got_pic)  
{  
    int ret, got_picture;  
    AVCodecContext *c = ost->enc;  
    AVFrame * ret_frame=NULL;  
    if(av_compare_ts(ost->next_pts, c->time_base,STREAM_DURATION, (AVRational){1,1})>=0)  
        return NULL;  
  
    /*当我们将帧传递给编码器时，它可能会保留对它的引用
    *内部,确保我们在这里不覆盖它*/
    if (av_frame_make_writable(ost->frame)<0)  
        exit(1);  
    if(av_read_frame(input->v_ifmtCtx, input->in_packet)>=0)
    {  
        if(input->in_packet->stream_index==input->videoindex)
        {  
            ret = avcodec_decode_video2(input->pCodecCtx, input->pFrame, &got_picture, input->in_packet);  
            *got_pic=got_picture;  
            if(ret<0)
            {  
                printf("Decode Error.\n");  
                av_packet_unref(input->in_packet);  
                return NULL;  
            }  
            if(got_picture)
            {  
                sws_scale(input->img_convert_ctx, (const unsigned char* const*)input->pFrame->data, input->pFrame->linesize, 0, input->pCodecCtx->height, ost->frame->data,  ost->frame->linesize);  
                ost->frame->pts =ost->next_pts++;  
                ret_frame= ost->frame;    
            }  
        }  
        av_packet_unref(input->in_packet);  
    }  
    return ret_frame;  
}  
static void close_stream(AVFormatContext *oc, OutputStream *ost)  
{  
    avcodec_free_context(&ost->enc);  
    av_frame_free(&ost->frame);  
    av_frame_free(&ost->tmp_frame);  
    sws_freeContext(ost->sws_ctx);  
    swr_free(&ost->swr_ctx);  
}  
 
/*
采集摄像头数据编码成MP4视频
*/  
int main(int argc, char **argv)  
{  
    OutputStream video_st = { 0 }, audio_st = { 0 };  
    const char *filename;  
    AVOutputFormat *fmt;  
    AVFormatContext *oc;  
    AVCodec *audio_codec, *video_codec;  
    int ret;  
    int have_video = 0, have_audio = 0;  
    int encode_video = 0, encode_audio = 0;  
    AVDictionary *opt = NULL;  
    int i;  
  
    if(argc<3)
    {  
        //./app /dev/video0 123.mp4
        printf("用法: %s <摄像头设备节点> <文件名称> \n", argv[0]);  
        return 1;  
    }  
  
    filename = argv[2];  
    printf("当前存储的视频文件名称:%s\n",filename);
    /*分配输出媒体环境*/
    avformat_alloc_output_context2(&oc, NULL, NULL, filename);  
    if(!oc)
    {  
        printf("无法从文件扩展名推断出输出格式：使用MPEG。\n");  
        avformat_alloc_output_context2(&oc, NULL, "mpeg", filename);  
    }  
    if(!oc)return 1;  
    //添加摄像头----------------------------------
    IntputDev video_input={0};  
    AVCodecContext  *pCodecCtx;  
    AVCodec         *pCodec;  
    AVFormatContext *v_ifmtCtx;  
    avdevice_register_all();  
    v_ifmtCtx = avformat_alloc_context();  
    //Linux下指定摄像头信息  
    AVInputFormat *ifmt=av_find_input_format("video4linux2");  
    if(avformat_open_input(&v_ifmtCtx,argv[1],ifmt,NULL)!=0)
    {  
        printf("无法打开输入流.%s\n",argv[1]);  
        return -1;  
    }
    if(avformat_find_stream_info(v_ifmtCtx,NULL)<0)  
    {  
        printf("找不到流信息.\n");  
        return -1;  
    }
    int videoindex=-1;  
    for(i=0; i<v_ifmtCtx->nb_streams; i++)   
    if(v_ifmtCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)  
    {  
        videoindex=i;  
        printf("videoindex=%d\n",videoindex);
        break;  
    }
    if(videoindex==-1)  
    {  
        printf("找不到视频流。\n");  
        return -1;  
    }  
    pCodecCtx=v_ifmtCtx->streams[videoindex]->codec; 
    pCodec=avcodec_find_decoder(pCodecCtx->codec_id);  
    if(pCodec==NULL)  
    {  
        printf("找不到编解码器。\n");  
        return -1;  
    }  
    if(avcodec_open2(pCodecCtx, pCodec,NULL)<0)  
    {  
        printf("无法打开编解码器。\n");  
        return -1;  
    }  
  
    AVFrame *pFrame,*pFrameYUV;  
    pFrame=av_frame_alloc();  
    pFrameYUV=av_frame_alloc();
    
    unsigned char *out_buffer=(unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,16));  
    av_image_fill_arrays((AVPicture *)pFrameYUV->data,(AVPicture *)pFrameYUV->linesize, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,16);  
    printf("摄像头尺寸(WxH): %d x %d \n",pCodecCtx->width, pCodecCtx->height);  
    video_width=pCodecCtx->width;
    video_height=pCodecCtx->height;
    struct SwsContext *img_convert_ctx;  
    img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);   
    AVPacket *in_packet=(AVPacket *)av_malloc(sizeof(AVPacket));  
    video_input.img_convert_ctx=img_convert_ctx;  
    video_input.in_packet=in_packet;  
    video_input.pCodecCtx=pCodecCtx;  
    video_input.pCodec=pCodec;  
    video_input.v_ifmtCtx=v_ifmtCtx;  
    video_input.videoindex=videoindex;  
    video_input.pFrame=pFrame;  
    video_input.pFrameYUV=pFrameYUV;  
    //-----------------------------添加摄像头结束
    fmt=oc->oformat;  
    /*使用默认格式的编解码器添加音频和视频流并初始化编解码器。*/ 
    printf("fmt->video_codec = %d\n", fmt->video_codec);  
    if(fmt->video_codec != AV_CODEC_ID_NONE)
    {  
        add_stream(&video_st,oc,&video_codec,fmt->video_codec);  
        have_video=1;  
        encode_video=1;  
    }  
    /*现在已经设置了所有参数，可以打开音频并视频编解码器，并分配必要的编码缓冲区。*/
    if(have_video)open_video(oc, video_codec, &video_st, opt);  
    av_dump_format(oc,0,filename,1);  
    /* 打开输出文件(如果需要) */  
    if(!(fmt->flags & AVFMT_NOFILE))
    {  
        ret=avio_open(&oc->pb,filename,AVIO_FLAG_WRITE);  
        if(ret<0)
        {  
            fprintf(stderr, "打不开'%s': %s\n", filename,av_err2str(ret));  
            return 1;  
        }  
    }  
    /* 编写流头(如果有)*/  
    ret=avformat_write_header(oc, &opt);  
    if(ret<0)
    {  
        fprintf(stderr, "打开输出文件时发生错误: %s\n",av_err2str(ret));  
        return 1;  
    }  
    int got_pic;  
    while(encode_video)
    {  
        /*选择要编码的流*/    
        AVFrame *frame=get_video_frame(&video_st,&video_input,&got_pic);  
        if(!got_pic)  
        {  
            usleep(10000);  
            continue;  
        }
        encode_video=!write_video_frame(oc,&video_st,frame);  
    }  
    av_write_trailer(oc);  
    sws_freeContext(video_input.img_convert_ctx);  
    avcodec_close(video_input.pCodecCtx);  
    av_free(video_input.pFrameYUV);  
    av_free(video_input.pFrame);      
    avformat_close_input(&video_input.v_ifmtCtx); 
    /*关闭每个编解码器*/  
    if (have_video)close_stream(oc, &video_st);
    /*关闭输出文件*/ 
    if (!(fmt->flags & AVFMT_NOFILE))avio_closep(&oc->pb);  
    /*释放流*/  
    avformat_free_context(oc); 
    return 0;  
}

app1:
    arm-linux-gcc ffmpeg_video.c -I /home/wbyq/work/tiny4412/ffmpeg-4.2.2/_install/include -L /home/wbyq/work/tiny4412/ffmpeg-4.2.2/_install/lib -I/home/wbyq/work/tiny4412/x264-master/_install/include -L/home/wbyq/work/tiny4412/x264-master/_install/lib -lavcodec -lavfilter -lavutil -lswresample -lavdevice -lavformat -lpostproc -lswscale -lx264

[root@tiny4412 code]# ./a.out /dev/video15 123.mp4