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Add detection of container/video_codec/audio_codec compatibility for live file streaming or transcoding (#384)

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* add forceMKV, forceHEVC config options
* drop audio stream instead of trying to transcode for ffmpeg unsupported/unknown audio codecs
This commit is contained in:
bnkai
2020-04-10 01:38:34 +03:00
committed by GitHub
parent dc37a3045b
commit d5617307f1
21 changed files with 632 additions and 60 deletions
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93
pkg/ffmpeg/encoder_transcode.go
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@@ -69,6 +69,49 @@ func (e *Encoder) Transcode(probeResult VideoFile, options TranscodeOptions) {
_, _ = e.run(probeResult, args)
}
//transcode the video, remove the audio
//in some videos where the audio codec is not supported by ffmpeg
//ffmpeg fails if you try to transcode the audio
func (e *Encoder) TranscodeVideo(probeResult VideoFile, options TranscodeOptions) {
scale := calculateTranscodeScale(probeResult, options.MaxTranscodeSize)
args := []string{
"-i", probeResult.Path,
"-an",
"-c:v", "libx264",
"-pix_fmt", "yuv420p",
"-profile:v", "high",
"-level", "4.2",
"-preset", "superfast",
"-crf", "23",
"-vf", "scale=" + scale,
options.OutputPath,
}
_, _ = e.run(probeResult, args)
}
//copy the video stream as is, transcode audio
func (e *Encoder) TranscodeAudio(probeResult VideoFile, options TranscodeOptions) {
args := []string{
"-i", probeResult.Path,
"-c:v", "copy",
"-c:a", "aac",
"-strict", "-2",
options.OutputPath,
}
_, _ = e.run(probeResult, args)
}
//copy the video stream as is, drop audio
func (e *Encoder) CopyVideo(probeResult VideoFile, options TranscodeOptions) {
args := []string{
"-i", probeResult.Path,
"-an",
"-c:v", "copy",
options.OutputPath,
}
_, _ = e.run(probeResult, args)
}
func (e *Encoder) StreamTranscode(probeResult VideoFile, startTime string, maxTranscodeSize models.StreamingResolutionEnum) (io.ReadCloser, *os.Process, error) {
scale := calculateTranscodeScale(probeResult, maxTranscodeSize)
args := []string{}
@@ -92,3 +135,53 @@ func (e *Encoder) StreamTranscode(probeResult VideoFile, startTime string, maxTr
return e.stream(probeResult, args)
}
//transcode the video, remove the audio
//in some videos where the audio codec is not supported by ffmpeg
//ffmpeg fails if you try to transcode the audio
func (e *Encoder) StreamTranscodeVideo(probeResult VideoFile, startTime string, maxTranscodeSize models.StreamingResolutionEnum) (io.ReadCloser, *os.Process, error) {
scale := calculateTranscodeScale(probeResult, maxTranscodeSize)
args := []string{}
if startTime != "" {
args = append(args, "-ss", startTime)
}
args = append(args,
"-i", probeResult.Path,
"-an",
"-c:v", "libvpx-vp9",
"-vf", "scale="+scale,
"-deadline", "realtime",
"-cpu-used", "5",
"-row-mt", "1",
"-crf", "30",
"-b:v", "0",
"-f", "webm",
"pipe:",
)
return e.stream(probeResult, args)
}
//it is very common in MKVs to have just the audio codec unsupported
//copy the video stream, transcode the audio and serve as Matroska
func (e *Encoder) StreamMkvTranscodeAudio(probeResult VideoFile, startTime string, maxTranscodeSize models.StreamingResolutionEnum) (io.ReadCloser, *os.Process, error) {
args := []string{}
if startTime != "" {
args = append(args, "-ss", startTime)
}
args = append(args,
"-i", probeResult.Path,
"-c:v", "copy",
"-c:a", "libopus",
"-b:a", "96k",
"-vbr", "on",
"-f", "matroska",
"pipe:",
)
return e.stream(probeResult, args)
}