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我已经尝试使用命令行将流从 VP8 转码到 H264，它工作正常，但是当我使用 fluent-ffmpeg 尝试相同的事情时，它没有按预期工作。

版本信息

流利的 ffmpeg 版本：“2.1.2”

ffmpeg 版本：“3.4.4-1~16.04.york0”

操作系统：“Ubuntu”

从 VP8 到 H264 的转码正在使用命令工作

ffmpeg -analyzeduration 300M -probesize 300M -protocol_whitelist file,udp,rtp -i portal-vp8.sdp -c:v libx264 -profile:v high -level:v 3.2 -pix_fmt yuv420p -x264-params keyint=25:scenecut=0 -r 25 -c:a aac -ar 16k -ac 1 -preset ultrafast -tune zerolatency -f flv rtmp://my-server-ip/myapp/testvp8

我的sdp是

v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 127.0.0.1
t=0 0
a=tool:libavformat 55.2.100
m=audio 5396 TCP 111
a=rtpmap:111 opus/48000
m=video 5398 RTP/AVP 100
a=rtpmap:100 VP8/90000
a=fmtp:100 packetization-mode=1

从 VP8 到 H264 的转码无法使用库

var sdpString = "v=0\r\no=- 0 0 IN IP4 127.0.0.1\r\ns=No Name\r\nc=IN IP4 127.0.0.1\r\nt=0 0\r\na=tool:libavformat 55.2.100\r\nm=audio 5120 TCP 111\r\na=rtpmap:111 opus/48000\r\nm=video 5122 RTP/AVP 100\r\na=rtpmap:100 VP8/90000";

let sdp = stringToStream(sdpString);
var inputOptions = [];
    inputOptions.push('-analyzeduration');
    inputOptions.push('300M');
    inputOptions.push('-probesize');
    inputOptions.push('300M');
    inputOptions.push('-protocol_whitelist');
    inputOptions.push('file,udp,rtp,pipe');

var outputOptions = [];
    outputOptions.push('-c:v');
    outputOptions.push('libx264');

    outputOptions.push('-profile:v');
    outputOptions.push('high');

    outputOptions.push('-level:v');
    outputOptions.push('3.2');

    outputOptions.push('-pix_fmt');
    outputOptions.push('yuv420p');

    outputOptions.push('-x264-params');
    outputOptions.push('keyint=25:scenecut=0');

    outputOptions.push('-r');
    outputOptions.push('25');

    outputOptions.push('-c:a');
    outputOptions.push('aac');

    outputOptions.push('-ar');
    outputOptions.push('16k');

    outputOptions.push('-ac');
    outputOptions.push('1');

    outputOptions.push('-preset');
    outputOptions.push('ultrafast');

    outputOptions.push('-tune');
    outputOptions.push('zerolatency');

    outputOptions.push('-f');
    outputOptions.push('flv');

var outputUrl = "rtmp://my-server-ip/myapp/testvp8";

var command = FfmpegCommand(sdp).inputOptions(inputOptions).outputOptions(outputOptions).output(outputUrl)
        .on('start', function (commandLine) {
            console.log('Spawned Ffmpeg with command: ' + commandLine);
        })
        .on('stderr', function(stderrLine) {
            console.log('FFMPEG Stderr output: ' + stderrLine);
        });

    command.run();
});

使用库生成的命令

ffmpeg -analyzeduration 300M -probesize 300M -protocol_whitelist file,udp,rtp,pipe -i pipe:0 -c:v libx264 -profile:v high -level:v 3.2 -pix_fmt yuv420p -x264-params keyint=25:scenecut=0 -r 25 -c:a aac -ar 16k -ac 1 -preset ultrafast -tune zerolatency -f flv rtmp://my-server-ip/myapp/testvp8

FFmpeg 日志

FFMPEG Stderr output: ffmpeg version 3.4.4-1~16.04.york0 Copyright (c) 2000-2018 the FFmpeg developers
FFMPEG Stderr output:   built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
FFMPEG Stderr output:   configuration: --prefix=/usr --extra-version='1~16.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
FFMPEG Stderr output:   libavutil      55. 78.100 / 55. 78.100
FFMPEG Stderr output:   libavcodec     57.107.100 / 57.107.100
FFMPEG Stderr output:   libavformat    57. 83.100 / 57. 83.100
FFMPEG Stderr output:   libavdevice    57. 10.100 / 57. 10.100
FFMPEG Stderr output:   libavfilter     6.107.100 /  6.107.100
FFMPEG Stderr output:   libavresample   3.  7.  0 /  3.  7.  0
FFMPEG Stderr output:   libswscale      4.  8.100 /  4.  8.100
FFMPEG Stderr output:   libswresample   2.  9.100 /  2.  9.100
FFMPEG Stderr output:   libpostproc    54.  7.100 / 54.  7.100
FFMPEG Stderr output: [sdp @ 0x55c28151c180] max delay reached. need to consume packet
FFMPEG Stderr output: [sdp @ 0x55c28151c180] RTP: missed 1 packets

观察结果

我观察到输入的 VP8 流未使用 FFmpeg 库转码为 H264

预期成绩

输入的 VP8 流应使用库转码为 H264。

请帮忙，我该如何解决这个问题。

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