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video.go
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video.go
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package processing
import (
"errors"
"fmt"
"log"
"os"
"path"
"github.com/vas3k/pepic/pepic/config"
"github.com/vas3k/pepic/pepic/entity"
"github.com/vas3k/pepic/pepic/utils"
"github.com/xfrr/goffmpeg/transcoder"
)
type VideoBackend interface {
Transcode(file *entity.ProcessingFile, maxLength int) error
Convert(file *entity.ProcessingFile, newMimeType string) error
}
type videoBackend struct {
}
func NewVideoBackend() VideoBackend {
return &videoBackend{}
}
func (v *videoBackend) Transcode(file *entity.ProcessingFile, maxLength int) error {
log.Printf("Transcoding video '%s' to %d px", file.Filename, maxLength)
if file.Bytes == nil {
return errors.New("file data is empty, try reading it first")
}
// save bytes to disc because ffmpeg works with filenames
tempOrigFile := path.Join(config.App.Videos.FFmpeg.TempDir, file.Filename)
dst, err := os.Create(tempOrigFile)
if err != nil {
return err
}
defer dst.Close()
defer os.Remove(tempOrigFile)
_, err = dst.Write(file.Bytes)
if err != nil {
return err
}
// create temp file output
tempTransFile := path.Join(config.App.Videos.FFmpeg.TempDir, fmt.Sprintf("trans_%s", file.Filename))
dst, err = os.Create(tempTransFile)
if err != nil {
return err
}
defer dst.Close()
defer os.Remove(tempTransFile)
// create and configure video transcoder
trans, err := v.initTranscoder(tempOrigFile, tempTransFile)
if err != nil {
return err
}
// add resize filter
trans.MediaFile().SetVideoFilter(fmt.Sprintf("scale=trunc(oh*a/2)*2:%d", maxLength))
// run transcoding and monitor the process
done := v.runTranscoder(trans)
err = <-done
if err != nil {
return err
}
// load transcoded video back to memory and remove temp files (deferred)
file.Bytes, err = os.ReadFile(tempTransFile)
if err != nil {
return err
}
return nil
}
func (v *videoBackend) Convert(file *entity.ProcessingFile, newMimeType string) error {
log.Printf("Converting video '%s' to %s", file.Filename, newMimeType)
if file.Bytes == nil {
return errors.New("file data is empty, try reading it first")
}
// save bytes to disc because ffmpeg works with filenames
tempOrigFile := path.Join(config.App.Videos.FFmpeg.TempDir, file.Filename)
dst, err := os.Create(tempOrigFile)
if err != nil {
return err
}
defer dst.Close()
defer os.Remove(tempOrigFile)
_, err = dst.Write(file.Bytes)
if err != nil {
return err
}
// create temp file output
newExt, _ := utils.ExtensionByMimeType(newMimeType)
convFilename := utils.ReplaceExt(file.Filename, newExt)
tempTransFile := path.Join(config.App.Videos.FFmpeg.TempDir, fmt.Sprintf("conv_%s", convFilename))
dst, err = os.Create(tempTransFile)
if err != nil {
return err
}
defer dst.Close()
defer os.Remove(tempTransFile)
// create and configure video transcoder
trans, err := v.initTranscoder(tempOrigFile, tempTransFile)
if err != nil {
return err
}
// run transcoding and monitor the process
done := v.runTranscoder(trans)
err = <-done
if err != nil {
return err
}
// load transcoded video back to memory and remove temp files (deferred)
file.Bytes, err = os.ReadFile(tempTransFile)
if err != nil {
return err
}
file.Mime = newMimeType
file.Filename = convFilename
if file.Path != "" {
file.Path = utils.ReplaceExt(file.Path, newExt)
}
return nil
}
func (v *videoBackend) initTranscoder(inputPath string, outputPath string) (*transcoder.Transcoder, error) {
trans := new(transcoder.Transcoder)
err := trans.Initialize(inputPath, outputPath)
if err != nil {
return nil, err
}
trans.MediaFile().SetPreset(config.App.Videos.FFmpeg.Preset)
trans.MediaFile().SetCRF(uint32(config.App.Videos.FFmpeg.CRF))
trans.MediaFile().SetVideoCodec(config.App.Videos.FFmpeg.VideoCodec)
trans.MediaFile().SetVideoBitRate(config.App.Videos.FFmpeg.VideoBitrate)
trans.MediaFile().SetVideoProfile(config.App.Videos.FFmpeg.VideoProfile)
trans.MediaFile().SetAudioCodec(config.App.Videos.FFmpeg.AudioCodec)
trans.MediaFile().SetAudioBitRate(config.App.Videos.FFmpeg.AudioBitrate)
trans.MediaFile().SetBufferSize(config.App.Videos.FFmpeg.BufferSize)
trans.MediaFile().SetMovFlags(config.App.Videos.FFmpeg.MovFlags)
trans.MediaFile().SetPixFmt(config.App.Videos.FFmpeg.PixFmt)
return trans, nil
}
func (v *videoBackend) runTranscoder(trans *transcoder.Transcoder) <-chan error {
done := trans.Run(true)
progress := trans.Output()
for msg := range progress {
log.Print(msg)
}
return done
}