go调用FFmpeg实践

package main
/*
#cgo CFLAGS: -IC:/ffmpeg/include
#cgo LDFLAGS: -LC:/ffmpeg/lib/ -llibavformat  -llibavcodec -llibavutil -llibavdevice -llibavfilter -llibswresample -llibswscale
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libavutil/avutil.h>
#include <libavutil/opt.h>
#include <libavdevice/avdevice.h>
static const AVStream *go_av_streams_get(const AVStream **streams,unsigned int n)
{
    return streams[n];
}
*/
import "C"
import (
    "fmt"
)
func main() {
    fmt.Println(C.avdevice_version())
}

系统命令

package main
import (
    "bytes"
    "fmt"
    "os/exec"
)
func main() {
    in := bytes.NewBuffer(nil)
    //linux
    //cmd := exec.Command("sh")
    //windows
    cmd := exec.Command("cmd")
    cmd.Stdin = in
    go func() {
        in.WriteString("echo hello world > test.txt\n")
        in.WriteString("exit\n")
    }()
    if err := cmd.Run(); err != nil {
        fmt.Println(err)
        return
    }
}

ffmpeg转码

func main() {
    cmdArguments := []string{"-i", "divx.avi", "-c:v", "libx264",
        "-crf", "20", "-c:a", "aac", "-strict", "-2", "video1-fix.ts"}
    cmd := exec.Command("ffmpeg", cmdArguments...)
    var out bytes.Buffer
    cmd.Stdout = &out
    err := cmd.Run()
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("command output: %q", out.String())
}

ffmpeg录音

ffmpeg -list_devices true -f dshow -i dummy
ffmpeg version git-2020-04-22-2e38c63 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200328
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt 
--enable-amf
  libavutil      56. 42.102 / 56. 42.102
  libavcodec     58. 80.100 / 58. 80.100
  libavformat    58. 42.101 / 58. 42.101
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 79.100 /  7. 79.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
[dshow @ 000001d6f042bbc0] DirectShow video devices (some may be both video and audio devices)
[dshow @ 000001d6f042bbc0]  "Integrated Webcam"
[dshow @ 000001d6f042bbc0]     Alternative name "@device_pnp_\\?\usb#vid_1bcf&pid_2b95&mi_00#6&1ca786e2&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 000001d6f042bbc0] DirectShow audio devices
[dshow @ 000001d6f042bbc0]  "Line-In/Mic-In (SB X-Fi Surround 5.1)"
[dshow @ 000001d6f042bbc0]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{FC795785-0F3D-483E-94A3-B8A1ADAC0520}"
[dshow @ 000001d6f042bbc0]  "麦克风 (Realtek(R) Audio)"
[dshow @ 000001d6f042bbc0]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{34BE0A01-C298-4CAA-88F7-87EFA5B666A6}"
[dshow @ 000001d6f042bbc0]  "What U Hear (SB X-Fi Surround 5.1)"
[dshow @ 000001d6f042bbc0]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{CC0A7A5D-9D3E-4AE7-8B81-89617B15CF5E}"

录音

func main() {
    in := bytes.Buffer{}
    outInfo := bytes.Buffer{}
    cmd := exec.Command("cmd")
    //cmd := exec.Command("ping", "www.163.com")
    cmd.Stdout = &outInfo
    cmd.Stdin = &in
    //in.WriteString("echo hello world > test.txt\n")
    // go func() {
    //  //in.WriteString("ffmpeg -f dshow -i  audio=麦克风 (Realtek(R) Audio) -ar 16000 -ac 1 -t 00:00:05 test.wav\n")
    // }()
    //命令写入cmd.Stdin
    in.WriteString("ffmpeg -f dshow -i  audio=@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\\wave_{34BE0A01-C298-4CAA-88F7-87EFA5B666A6} -ar 16000 -ac 1 -t 00:00:05 test.wav -y \n")
    //in.WriteString("ping www.baidu.com\n")
    //in.WriteString("echo hello world\n")
    // if err := cmd.Run(); err != nil {
    //  fmt.Println(err)
    //  return
    // }
    err := cmd.Start()
    if err != nil {
        fmt.Println(err.Error())
    }
    if err = cmd.Wait(); err != nil {
        fmt.Println(err.Error())
    } else {
        fmt.Println(cmd.ProcessState.Pid())
        //程序退出code
        fmt.Println(cmd.ProcessState.Sys().(syscall.WaitStatus).ExitCode)
        //输出结果
        fmt.Println(outInfo.String())
    }
}