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Add using wav format for ffmpeg transcoding to PCMA/PCMU

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This commit is contained in:
Alex X
2024-05-21 17:50:15 +03:00
parent 54c8ca0112
commit c41bddbbea
2 changed files with 19 additions and 6 deletions
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2
internal/ffmpeg/README.md
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@@ -49,7 +49,7 @@
```yaml
streams:
tts: ffmpeg:#input=-re -f lavfi -i "flite=text='1 2 3 4 5 6 7 8 9 0'"#audio=pcma
tts: ffmpeg:#input=-readrate 1 -readrate_initial_burst 0.001 -f lavfi -i "flite=text='1 2 3 4 5 6 7 8 9 0'"#audio=pcma
```
## Useful links

21
internal/ffmpeg/ffmpeg.go
View File

@@ -49,6 +49,7 @@ var defaults = map[string]string{
// output
"output": "-user_agent ffmpeg/go2rtc -rtsp_transport tcp -f rtsp {output}",
"output/mjpeg": "-f mjpeg -",
"output/wav": "-f wav -",
// `-preset superfast` - we can't use ultrafast because it doesn't support `-profile main -level 4.1`
// `-tune zerolatency` - for minimal latency
@@ -315,12 +316,24 @@ func parseArgs(s string) *ffmpeg.Args {
args.AddCodec("-an")
}
// transcoding to only mjpeg
if (args.Video == 1 && args.Audio == 0 && query.Get("video") == "mjpeg") ||
// no transcoding from mjpeg input
(args.Video == 0 && args.Audio == 0 && strings.Contains(args.Input, " mjpeg ")) {
// change otput from RTSP to some other pipe format
switch {
case args.Video == 0 && args.Audio == 0:
// no transcoding from mjpeg input (ffmpeg device with support output as raw MJPEG)
if strings.Contains(args.Input, " mjpeg ") {
args.Output = defaults["output/mjpeg"]
}
case args.Video == 1 && args.Audio == 0:
if query.Get("video") == "mjpeg" {
args.Output = defaults["output/mjpeg"]
}
case args.Video == 0 && args.Audio == 1:
codec, _, _ := strings.Cut(query.Get("audio"), "/")
switch codec {
case "pcma", "pcmu", "pcml":
args.Output = defaults["output/wav"]
}
}
return args
}