326 lines
8.1 KiB
Go
326 lines
8.1 KiB
Go
package util
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import (
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"ZhenTuLocalPassiveAdapter/dto"
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"bytes"
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"fmt"
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"log"
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"math/rand"
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"os"
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"os/exec"
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"path"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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const FfmpegExec = "ffmpeg"
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func RunFfmpegTask(task *dto.FfmpegTask) bool {
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var result bool
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if len(task.Files) == 1 {
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// 单个文件切割，用简单方法
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result = runFfmpegForSingleFile(task)
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} else {
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// 多个文件切割，用速度快的
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result = runFfmpegForMultipleFile1(task)
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}
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// 先尝试方法1
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if result {
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return true
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}
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log.Printf("FFMPEG简易方法失败，尝试复杂方法转码")
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// 不行再尝试方法二
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return runFfmpegForMultipleFile2(task)
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}
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func runFfmpegForMultipleFile1(task *dto.FfmpegTask) bool {
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// 多文件，方法一：先转换成ts，然后合并切割
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// 步骤一：先转换成ts，并行转换
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var wg sync.WaitGroup
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var mu sync.Mutex
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var notOk bool
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for i := range task.Files {
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wg.Add(1)
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go func(file *dto.File) {
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defer wg.Done()
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tmpFile := path.Join(os.TempDir(), file.Name+".ts")
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result, err := convertMp4ToTs(*file, tmpFile)
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if err != nil {
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log.Printf("转码出错: %v", err)
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mu.Lock()
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notOk = true
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mu.Unlock()
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return
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}
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if result {
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mu.Lock()
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file.Url = tmpFile
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mu.Unlock()
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} else {
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// 失败了，务必删除临时文件
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os.Remove(tmpFile)
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}
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}(&task.Files[i])
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}
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wg.Wait()
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if notOk {
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return false
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}
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// 步骤二：使用concat协议拼接裁切
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result, err := QuickConcatVideoCut(task.Files, int64(task.Offset), int64(task.Length), task.OutputFile)
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if err != nil {
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return false
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}
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// 步骤三：删除临时文件
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for _, file := range task.Files {
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if err := os.Remove(file.Url); err != nil {
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log.Printf("删除临时文件失败: %v", err)
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}
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}
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return result
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}
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func runFfmpegForMultipleFile2(task *dto.FfmpegTask) bool {
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// 多文件，方法二：使用计算资源编码
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result, err := SlowVideoCut(task.Files, int64(task.Offset), int64(task.Length), task.OutputFile)
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if err != nil {
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return false
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}
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return result
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}
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func runFfmpegForSingleFile(task *dto.FfmpegTask) bool {
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result, err := QuickVideoCut(task.Files[0].Url, int64(task.Offset), int64(task.Length), task.OutputFile)
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if err != nil {
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return false
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}
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_, err = os.Stat(task.OutputFile)
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if err != nil {
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log.Printf("文件不存在：%s", task.OutputFile)
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return false
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}
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return result
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}
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func CheckFileCoverageAndConstructTask(fileList []dto.File, beginDt, endDt time.Time, task dto.Task) (*dto.FfmpegTask, error) {
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if fileList == nil || len(fileList) == 0 {
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log.Printf("无法根据要求找到对应录制片段！ID：【%s】，开始时间：【%s】，结束时间：【%s】", task.TaskID, beginDt, endDt)
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return nil, fmt.Errorf("无法根据要求找到对应录制片段")
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}
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// 如果片段在中间断开时间过长
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if len(fileList) > 1 {
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var lastFile *dto.File
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for _, file := range fileList {
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if lastFile == nil {
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lastFile = &file
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continue
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}
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if file.StartTime.Sub(lastFile.EndTime).Milliseconds() > 2000 {
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// 片段断开
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log.Printf("分析FFMPEG任务失败：ID：【%s】，文件片段：【%s,%s】中间断开【%f】秒(超过2秒)", task.TaskID, lastFile.Name, file.Name, file.StartTime.Sub(lastFile.EndTime).Seconds())
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return nil, fmt.Errorf("片段断开")
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}
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lastFile = &file
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}
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}
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// 通过文件列表构造的任务仍然是缺失的
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if fileList[len(fileList)-1].EndTime.Before(endDt) {
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log.Printf("分析FFMPEG任务失败：ID：【%s】，文件片段：【%s】，无法完整覆盖时间点【%s】", task.TaskID, fileList[len(fileList)-1].Name, endDt)
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return nil, fmt.Errorf("片段断开")
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}
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// 构造FfmpegTaskPo
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ffmpegTask := &dto.FfmpegTask{
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Files: fileList,
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Length: int(endDt.Sub(beginDt).Seconds()),
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Offset: int(beginDt.Sub(fileList[0].StartTime).Seconds()),
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OutputFile: path.Join(os.TempDir(), task.TaskID+".mp4"),
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}
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return ffmpegTask, nil
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}
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func convertMp4ToTs(file dto.File, outFileName string) (bool, error) {
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ffmpegCmd := []string{
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FfmpegExec,
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"-hide_banner",
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"-y",
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"-i", file.Url,
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"-c", "copy",
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"-bsf:v", "h264_mp4toannexb",
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"-f", "mpegts",
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outFileName,
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}
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return handleFfmpegProcess(ffmpegCmd)
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}
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func convertHevcToTs(file dto.File, outFileName string) (bool, error) {
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ffmpegCmd := []string{
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FfmpegExec,
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"-hide_banner",
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"-y",
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"-i", file.Url,
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"-c", "copy",
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"-bsf:v", "hevc_mp4toannexb",
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"-f", "mpegts",
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outFileName,
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}
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return handleFfmpegProcess(ffmpegCmd)
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}
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func QuickVideoCut(inputFile string, offset, length int64, outputFile string) (bool, error) {
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ffmpegCmd := []string{
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FfmpegExec,
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"-hide_banner",
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"-y",
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"-i", inputFile,
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"-c:v", "copy",
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"-an",
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"-reset_timestamps", "1",
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"-ss", strconv.FormatInt(offset, 10),
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"-t", strconv.FormatInt(length, 10),
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"-f", "mp4",
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outputFile,
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}
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return handleFfmpegProcess(ffmpegCmd)
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}
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func QuickConcatVideoCut(inputFiles []dto.File, offset, length int64, outputFile string) (bool, error) {
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tmpFile := fmt.Sprintf("tmp%.10f.txt", rand.Float64())
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tmpFileObj, err := os.Create(tmpFile)
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if err != nil {
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log.Printf("创建临时文件失败：%s", tmpFile)
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return false, err
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}
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defer os.Remove(tmpFile)
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defer tmpFileObj.Close()
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for _, filePo := range inputFiles {
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_, err := tmpFileObj.WriteString(fmt.Sprintf("file '%s'\n", filePo.Url))
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if err != nil {
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log.Printf("写入临时文件失败：%s", tmpFile)
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return false, err
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}
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}
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ffmpegCmd := []string{
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FfmpegExec,
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"-hide_banner",
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"-y",
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"-f", "concat",
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"-safe", "0",
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"-i", tmpFile,
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"-c:v", "copy",
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"-an",
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"-ss", strconv.FormatInt(offset, 10),
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"-t", strconv.FormatInt(length, 10),
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"-f", "mp4",
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outputFile,
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}
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return handleFfmpegProcess(ffmpegCmd)
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}
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func SlowVideoCut(inputFiles []dto.File, offset, length int64, outputFile string) (bool, error) {
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ffmpegCmd := []string{
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FfmpegExec,
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"-hide_banner",
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"-y",
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}
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for _, file := range inputFiles {
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ffmpegCmd = append(ffmpegCmd, "-i", file.Url)
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}
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inputCount := len(inputFiles)
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filterComplex := strings.Builder{}
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for i := 0; i < inputCount; i++ {
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filterComplex.WriteString(fmt.Sprintf("[%d:v]", i))
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}
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filterComplex.WriteString(fmt.Sprintf("concat=n=%d:v=1[v]", inputCount))
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ffmpegCmd = append(ffmpegCmd,
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"-filter_complex", filterComplex.String(),
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"-map", "[v]",
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"-preset:v", "fast",
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"-an",
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"-ss", strconv.FormatInt(offset, 10),
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"-t", strconv.FormatInt(length, 10),
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"-f", "mp4",
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outputFile,
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)
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return handleFfmpegProcess(ffmpegCmd)
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}
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func handleFfmpegProcess(ffmpegCmd []string) (bool, error) {
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startTime := time.Now()
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log.Printf("FFMPEG执行命令：【%s】", strings.Join(ffmpegCmd, " "))
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cmd := exec.Command(ffmpegCmd[0], ffmpegCmd[1:]...)
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var stderr bytes.Buffer
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cmd.Stderr = &stderr
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err := cmd.Start()
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if err != nil {
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log.Printf("FFMPEG执行命令失败，错误信息：%s，命令：【%s】", stderr.String(), strings.Join(ffmpegCmd, " "))
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return false, err
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}
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defer cmd.Process.Kill()
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done := make(chan error, 1)
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go func() {
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done <- cmd.Wait()
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}()
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select {
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case <-time.After(1 * time.Minute):
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log.Printf("FFMPEG执行命令没有在1分钟内退出，命令：【%s】", strings.Join(ffmpegCmd, " "))
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return false, fmt.Errorf("ffmpeg command timed out")
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case err := <-done:
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if err != nil {
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log.Printf("FFMPEG执行命令失败，错误信息：%s，命令：【%s】", stderr.String(), strings.Join(ffmpegCmd, " "))
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return false, err
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}
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endTime := time.Now()
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log.Printf("FFMPEG执行命令结束，耗费时间：【%dms】，命令：【%s】", endTime.Sub(startTime).Milliseconds(), strings.Join(ffmpegCmd, " "))
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return true, nil
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}
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}
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func GetVideoDuration(filePath string) (float64, error) {
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ffprobeCmd := []string{
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"ffprobe",
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"-v", "error",
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"-show_entries", "format=duration",
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"-of", "default=noprint_wrappers=1:nokey=1",
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filePath,
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}
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cmd := exec.Command(ffprobeCmd[0], ffprobeCmd[1:]...)
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var out bytes.Buffer
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cmd.Stdout = &out
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err := cmd.Run()
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if err != nil {
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return 0, fmt.Errorf("failed to get video duration: %w", err)
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}
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durationStr := strings.TrimSpace(out.String())
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duration, err := strconv.ParseFloat(durationStr, 64)
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if err != nil {
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return 0, fmt.Errorf("failed to parse video duration: %w", err)
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}
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return duration, nil
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}
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