rv1126 ffmpeg使用

1.FFMPEG官网

官网入口

2.FFMPEG错误速查

#define AVERROR_BSF_NOT_FOUND      FFERRTAG(0xF8,'B','S','F') ///< Bitstream filter not found
#define AVERROR_BUG                FFERRTAG( 'B','U','G','!') ///< Internal bug, also see AVERROR_BUG2
#define AVERROR_BUFFER_TOO_SMALL   FFERRTAG( 'B','U','F','S') ///< Buffer too small
#define AVERROR_DECODER_NOT_FOUND  FFERRTAG(0xF8,'D','E','C') ///< Decoder not found
#define AVERROR_DEMUXER_NOT_FOUND  FFERRTAG(0xF8,'D','E','M') ///< Demuxer not found
#define AVERROR_ENCODER_NOT_FOUND  FFERRTAG(0xF8,'E','N','C') ///< Encoder not found
#define AVERROR_EOF                FFERRTAG( 'E','O','F',' ') ///< End of file
#define AVERROR_EXIT               FFERRTAG( 'E','X','I','T') ///< Immediate exit was requested; the called function should not be restarted
#define AVERROR_EXTERNAL           FFERRTAG( 'E','X','T',' ') ///< Generic error in an external library
#define AVERROR_FILTER_NOT_FOUND   FFERRTAG(0xF8,'F','I','L') ///< Filter not found
#define AVERROR_INVALIDDATA        FFERRTAG( 'I','N','D','A') ///< Invalid data found when processing input
#define AVERROR_MUXER_NOT_FOUND    FFERRTAG(0xF8,'M','U','X') ///< Muxer not found
#define AVERROR_OPTION_NOT_FOUND   FFERRTAG(0xF8,'O','P','T') ///< Option not found
#define AVERROR_PATCHWELCOME       FFERRTAG( 'P','A','W','E') ///< Not yet implemented in FFmpeg, patches welcome
#define AVERROR_PROTOCOL_NOT_FOUND FFERRTAG(0xF8,'P','R','O') ///< Protocol not found

#define AVERROR_STREAM_NOT_FOUND   FFERRTAG(0xF8,'S','T','R') ///< Stream not found
/**
 * This is semantically identical to AVERROR_BUG
 * it has been introduced in Libav after our AVERROR_BUG and with a modified value.
 */
#define AVERROR_BUG2               FFERRTAG( 'B','U','G',' ')
#define AVERROR_UNKNOWN            FFERRTAG( 'U','N','K','N') ///< Unknown error, typically from an external library
#define AVERROR_EXPERIMENTAL       (-0x2bb2afa8) ///< Requested feature is flagged experimental. Set strict_std_compliance if you really want to use it.
#define AVERROR_INPUT_CHANGED      (-0x636e6701) ///< Input changed between calls. Reconfiguration is required. (can be OR-ed with AVERROR_OUTPUT_CHANGED)
#define AVERROR_OUTPUT_CHANGED     (-0x636e6702) ///< Output changed between calls. Reconfiguration is required. (can be OR-ed with AVERROR_INPUT_CHANGED)
/* HTTP & RTSP errors */
#define AVERROR_HTTP_BAD_REQUEST   FFERRTAG(0xF8,'4','0','0')
#define AVERROR_HTTP_UNAUTHORIZED  FFERRTAG(0xF8,'4','0','1')
#define AVERROR_HTTP_FORBIDDEN     FFERRTAG(0xF8,'4','0','3')
#define AVERROR_HTTP_NOT_FOUND     FFERRTAG(0xF8,'4','0','4')
#define AVERROR_HTTP_OTHER_4XX     FFERRTAG(0xF8,'4','X','X')
#define AVERROR_HTTP_SERVER_ERROR  FFERRTAG(0xF8,'5','X','X')

一些常见的FFERRTAG的值转换ionic

AVERROR_BSF_NOT_FOUND = -1179861752
AVERROR_BUG = -558323010
AVERROR_BUFFER_TOO_SMALL = -1397118274
AVERROR_DECODER_NOT_FOUND = -1128613112
AVERROR_DEMUXER_NOT_FOUND = -1296385272
AVERROR_ENCODER_NOT_FOUND = -1129203192
AVERROR_EOF = -541478725
AVERROR_EXIT = -1414092869
AVERROR_EXTERNAL = -542398533
AVERROR_FILTER_NOT_FOUND = -1279870712
AVERROR_INVALIDDATA = -1094995529
AVERROR_MUXER_NOT_FOUND = -1481985528
AVERROR_OPTION_NOT_FOUND = -1414549496
AVERROR_PATCHWELCOME = -1163346256
AVERROR_PROTOCOL_NOT_FOUND = -1330794744
AVERROR_STREAM_NOT_FOUND = -1381258232
AVERROR_BUG2 = -541545794
AVERROR_UNKNOWN = -1313558101
AVERROR_EXPERIMENTAL = -733130664
AVERROR_INPUT_CHANGED = -1668179713
AVERROR_OUTPUT_CHANGED = -1668179714
AVERROR_HTTP_BAD_REQUEST = -808465656
AVERROR_HTTP_UNAUTHORIZED = -825242872
AVERROR_HTTP_FORBIDDEN = -858797304
AVERROR_HTTP_NOT_FOUND = -875574520
AVERROR_HTTP_OTHER_4XX = -1482175736
AVERROR_HTTP_SERVER_ERROR = -1482175992

3.拉流推流命令

1.拉rtsp流，然后通过rtmp推送出去：

ffmpeg -i rtsp://admin:12345@192.168.0.200:554/Streaming/Channels/1 -vcodec copy -acodec copy -f flv rtmp://192.168.0.31:1935/live/test123

2.将H265的视频流转码成H264的：

ffmpeg -y -vcodec hevc -i glw265.flv -acodec copy -vcodec libx264 glw264.flv

3.将H265的rtsp流拉下来，解码，然后再编码成H264的流，通过rtmp推送出去。

ffmpeg -y -vcodec hevc -i rtsp://192.168.0.132:554/user=admin_password=tlJwpbo6_channel=1_stream=0.sdp?real_stream -acodec copy -vcodec libx264 -vb 2048000 -f flv rtmp://192.168.0.32:1935/live/mainstream

4.将uvc的视频通过rtmp推送出去。

ffmpeg -r 25 -s 640x480 -i /dev/video10 -b:v 3000k -qscale 1 -c:a copy -pix_fmt yuv420p -f flv rtmp://192.168.0.30:1935/live/test123

5.本地mp4文件通过rtsp推送出去。

ffmpeg -re -i receive.mp4 -vcodec copy -codec copy -f rtsp rtsp://192.168.0.35/pusher

6.拉取rtsp视频流存H264文件

ffmpeg -i rtsp://admin:fs123456@192.168.0.66:554/Streaming/Channels/101 -c:v copy -an -bsf:v h264_mp4toannexb out.h264

7.拉取rtsp视频流存flv文件

ffmpeg -i "rtsp://admin:fs123456@192.168.0.66:554/Streaming/Channels/101" -vcodec copy -acodec copy -f flv "test.flv"

8.拉取rtsp视频流通过rtmp推送出去

ffmpeg -i rtsp://admin:fs123456@192.168.0.66:554/Streaming/Channels/101 -vcodec copy -acodec copy -f flv rtmp://192.168.0.35:1935/live/test123

9.本地.h264文件通过rtmp推送出去

ffmpeg -re -stream_loop -1 -i h265_encode.h264 -vcodec copy -acodec copy -f flv -y rtmp://127.0.0.1:1935/live/mainstream

10.拉rtsp流添加中文水印推rtmp流出去

ffmpeg -i rtsp://admin:fs123456@192.168.0.66:554/Streaming/Channels/101 -vf "drawtext=fontfile=simfang.ttf: text='中文水印测试':x=10:y=10:fontsize=24:fontcolor=red:shadowy=2" -c:v libx264 -c:a copy -f flv rtmp://192.168.0.30:1935/live/substream

注意：需要字库支持

11.将1080p h265编码的mp4文件转成960*540分辨率 h264编码mp4文件：

ffmpeg -i test-h265-10min.mp4 -vf scale=960:540 video-960x540-h265.mp4 -hide_banner

注意：转换之后，分辨率降低了，码率也降低了，清晰度受影响。

12.拉取rtsp流，加入sei信息，推rtmp流出去

ffmpeg -i rtsp://admin:fs123456@192.168.0.66:554/Streaming/Channels/101 -c copy -bsf:v h264_metadata=sei_user_data='086f3693b7b34f2c965321492feee5b8+hello' -an -y -f flv rtmp://192.168.0.36:1935/live/teststream

4.rv1126上编译调试

1.编译ffmpeg，可以直接到

/home/zl/firefly-workspace/rv1126_rv1109_linux_release_20210306/buildroot/output/firefly_rv1126_rv1109/build/ffmpeg-4.1.3

目录下，make，然后更新的动态库直接拷贝到板子上，这样来调试查看流程，如果要修改的话，得修改ffmpeg的压缩包，或者打patch。

2.编译librtmp:

sdk根目录下运行下面的命令：

make rtmpdump-rebuild

将生成的动态库也是拷贝到板子上调试

5.接口过时问题

ffmpeg很多网上的例程，用的都是ffmpeg早期的版本，编译的时候会提示：

warning: ‘AVBitStreamFilterContext* av_bitstream_filter_init(const char*)’ is deprecated (declared at /home/zl/vstdio-workspace/hi3536-webapp/nvrserver/libs/ffmpeg/include/libavcodec/avcodec.h:6022) [-Wdeprecated-declarations]
         h264bsfc = av_bitstream_filter_init("hevc_mp4toannexb");

这些可以作为警告信息忽略掉，不会影响执行，但是为了功能长期考虑，最好还是替换新接口。

1.av_bitstream_filter_init过时

该接口为老版本，用法如下：

//声明：    
AVBitStreamFilterContext* h264bsfc =  av_bitstream_filter_init("h264_mp4toannexb"); 
//使用
av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
//释放：
av_bitstream_filter_close(h264bsfc);

新版本用法：

//声明  
AVBSFContext *bsf_ctx = nullptr;
const AVBitStreamFilter *pfilter = av_bsf_get_by_name("h264_mp4toannexb");
av_bsf_alloc(pfilter, &bsf_ctx);
//使用：
av_bsf_send_packet(bsf_ctx, &packet);
av_bsf_receive_packet(bsf_ctx, &packet);
//释放：
av_bsf_free(&bsf_ctx);

6.查看某个编码支持的像素

ffmpeg -h encoder=mjpeg