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ffmpeg.go
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ffmpeg.go
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package ffmpeg
import (
"net/url"
"strings"
"github.com/AlexxIT/go2rtc/internal/app"
"github.com/AlexxIT/go2rtc/internal/ffmpeg/device"
"github.com/AlexxIT/go2rtc/internal/ffmpeg/hardware"
"github.com/AlexxIT/go2rtc/internal/ffmpeg/virtual"
"github.com/AlexxIT/go2rtc/internal/rtsp"
"github.com/AlexxIT/go2rtc/internal/streams"
"github.com/AlexxIT/go2rtc/pkg/ffmpeg"
)
func Init() {
var cfg struct {
Mod map[string]string `yaml:"ffmpeg"`
}
cfg.Mod = defaults // will be overriden from yaml
app.LoadConfig(&cfg)
if app.GetLogger("exec").GetLevel() >= 0 {
defaults["global"] += " -v error"
}
streams.RedirectFunc("ffmpeg", func(url string) (string, error) {
args := parseArgs(url[7:])
return "exec:" + args.String(), nil
})
device.Init(defaults["bin"])
hardware.Init(defaults["bin"])
}
var defaults = map[string]string{
"bin": "ffmpeg",
"global": "-hide_banner",
// inputs
"file": "-re -i {input}",
"http": "-fflags nobuffer -flags low_delay -i {input}",
"rtsp": "-fflags nobuffer -flags low_delay -timeout 5000000 -user_agent go2rtc/ffmpeg -rtsp_flags prefer_tcp -i {input}",
"rtsp/udp": "-fflags nobuffer -flags low_delay -timeout 5000000 -user_agent go2rtc/ffmpeg -i {input}",
// output
"output": "-user_agent ffmpeg/go2rtc -rtsp_transport tcp -f rtsp {output}",
"output/mjpeg": "-f mjpeg -",
// `-preset superfast` - we can't use ultrafast because it doesn't support `-profile main -level 4.1`
// `-tune zerolatency` - for minimal latency
// `-profile high -level 4.1` - most used streaming profile
// `-pix_fmt:v yuv420p` - important for Telegram
"h264": "-c:v libx264 -g 50 -profile:v high -level:v 4.1 -preset:v superfast -tune:v zerolatency -pix_fmt:v yuv420p",
"h265": "-c:v libx265 -g 50 -profile:v main -level:v 5.1 -preset:v superfast -tune:v zerolatency -pix_fmt:v yuv420p",
"mjpeg": "-c:v mjpeg",
//"mjpeg": "-c:v mjpeg -force_duplicated_matrix:v 1 -huffman:v 0 -pix_fmt:v yuvj420p",
// https://ffmpeg.org/ffmpeg-codecs.html#libopus-1
// https://github.com/pion/webrtc/issues/1514
// https://ffmpeg.org/ffmpeg-resampler.html
// `-async 1` or `-min_comp 0` - force resampling for static timestamp inc, important for WebRTC audio quality
"opus": "-c:a libopus -application:a lowdelay -min_comp 0",
"opus/16000": "-c:a libopus -application:a lowdelay -min_comp 0 -ar:a 16000 -ac:a 1",
"pcmu": "-c:a pcm_mulaw -ar:a 8000 -ac:a 1",
"pcmu/8000": "-c:a pcm_mulaw -ar:a 8000 -ac:a 1",
"pcmu/16000": "-c:a pcm_mulaw -ar:a 16000 -ac:a 1",
"pcmu/48000": "-c:a pcm_mulaw -ar:a 48000 -ac:a 1",
"pcma": "-c:a pcm_alaw -ar:a 8000 -ac:a 1",
"pcma/8000": "-c:a pcm_alaw -ar:a 8000 -ac:a 1",
"pcma/16000": "-c:a pcm_alaw -ar:a 16000 -ac:a 1",
"pcma/48000": "-c:a pcm_alaw -ar:a 48000 -ac:a 1",
"aac": "-c:a aac", // keep sample rate and channels
"aac/16000": "-c:a aac -ar:a 16000 -ac:a 1",
"mp3": "-c:a libmp3lame -q:a 8",
"pcm": "-c:a pcm_s16be -ar:a 8000 -ac:a 1",
"pcm/8000": "-c:a pcm_s16be -ar:a 8000 -ac:a 1",
"pcm/16000": "-c:a pcm_s16be -ar:a 16000 -ac:a 1",
"pcm/48000": "-c:a pcm_s16be -ar:a 48000 -ac:a 1",
"pcml": "-c:a pcm_s16le -ar:a 8000 -ac:a 1",
"pcml/8000": "-c:a pcm_s16le -ar:a 8000 -ac:a 1",
"pcml/44100": "-c:a pcm_s16le -ar:a 44100 -ac:a 1",
// hardware Intel and AMD on Linux
// better not to set `-async_depth:v 1` like for QSV, because framedrops
// `-bf 0` - disable B-frames is very important
"h264/vaapi": "-c:v h264_vaapi -g 50 -bf 0 -profile:v high -level:v 4.1 -sei:v 0",
"h265/vaapi": "-c:v hevc_vaapi -g 50 -bf 0 -profile:v main -level:v 5.1 -sei:v 0",
"mjpeg/vaapi": "-c:v mjpeg_vaapi",
// hardware Raspberry
"h264/v4l2m2m": "-c:v h264_v4l2m2m -g 50 -bf 0",
"h265/v4l2m2m": "-c:v hevc_v4l2m2m -g 50 -bf 0",
// hardware Rockchip
// important to use custom ffmpeg https://github.com/AlexxIT/go2rtc/issues/768
// hevc - doesn't have a profile setting
"h264/rkmpp": "-c:v h264_rkmpp_encoder -g 50 -bf 0 -profile:v high -level:v 4.1",
"h265/rkmpp": "-c:v hevc_rkmpp_encoder -g 50 -bf 0 -level:v 5.1",
// hardware NVidia on Linux and Windows
// preset=p2 - faster, tune=ll - low latency
"h264/cuda": "-c:v h264_nvenc -g 50 -bf 0 -profile:v high -level:v auto -preset:v p2 -tune:v ll",
"h265/cuda": "-c:v hevc_nvenc -g 50 -bf 0 -profile:v main -level:v auto",
// hardware Intel on Windows
"h264/dxva2": "-c:v h264_qsv -g 50 -bf 0 -profile:v high -level:v 4.1 -async_depth:v 1",
"h265/dxva2": "-c:v hevc_qsv -g 50 -bf 0 -profile:v main -level:v 5.1 -async_depth:v 1",
"mjpeg/dxva2": "-c:v mjpeg_qsv",
// hardware macOS
"h264/videotoolbox": "-c:v h264_videotoolbox -g 50 -bf 0 -profile:v high -level:v 4.1",
"h265/videotoolbox": "-c:v hevc_videotoolbox -g 50 -bf 0 -profile:v main -level:v 5.1",
}
// configTemplate - return template from config (defaults) if exist or return raw template
func configTemplate(template string) string {
if s := defaults[template]; s != "" {
return s
}
return template
}
// inputTemplate - select input template from YAML config by template name
// if query has input param - select another template by this name
// if there is no another template - use input param as template
func inputTemplate(name, s string, query url.Values) string {
var template string
if input := query.Get("input"); input != "" {
template = configTemplate(input)
} else {
template = defaults[name]
}
return strings.Replace(template, "{input}", s, 1)
}
func parseArgs(s string) *ffmpeg.Args {
// init FFmpeg arguments
args := &ffmpeg.Args{
Bin: defaults["bin"],
Global: defaults["global"],
Output: defaults["output"],
}
var query url.Values
if i := strings.IndexByte(s, '#'); i >= 0 {
query = streams.ParseQuery(s[i+1:])
args.Video = len(query["video"])
args.Audio = len(query["audio"])
s = s[:i]
}
// Parse input:
// 1. Input as xxxx:// link (http or rtsp or any other)
// 2. Input as stream name
// 3. Input as FFmpeg device (local USB camera)
if i := strings.Index(s, "://"); i > 0 {
switch s[:i] {
case "http", "https", "rtmp":
args.Input = inputTemplate("http", s, query)
case "rtsp", "rtsps":
// https://ffmpeg.org/ffmpeg-protocols.html#rtsp
// skip unnecessary input tracks
switch {
case (args.Video > 0 && args.Audio > 0) || (args.Video == 0 && args.Audio == 0):
args.Input = "-allowed_media_types video+audio "
case args.Video > 0:
args.Input = "-allowed_media_types video "
case args.Audio > 0:
args.Input = "-allowed_media_types audio "
}
args.Input += inputTemplate("rtsp", s, query)
default:
args.Input = "-i " + s
}
} else if streams.Get(s) != nil {
s = "rtsp://127.0.0.1:" + rtsp.Port + "/" + s
switch {
case args.Video > 0 && args.Audio == 0:
s += "?video"
case args.Audio > 0 && args.Video == 0:
s += "?audio"
default:
s += "?video&audio"
}
args.Input = inputTemplate("rtsp", s, query)
} else if strings.HasPrefix(s, "device?") {
var err error
args.Input, err = device.GetInput(s)
if err != nil {
return nil
}
} else if strings.HasPrefix(s, "virtual?") {
var err error
if args.Input, err = virtual.GetInput(s[8:]); err != nil {
return nil
}
} else {
args.Input = inputTemplate("file", s, query)
}
if query["async"] != nil {
args.Input = "-use_wallclock_as_timestamps 1 -async 1 " + args.Input
}
// Parse query params:
// 1. `width`/`height` params
// 2. `rotate` param
// 3. `video` params (support multiple)
// 4. `audio` params (support multiple)
// 5. `hardware` param
if query != nil {
// 1. Process raw params for FFmpeg
for _, raw := range query["raw"] {
// support templates https://github.com/AlexxIT/go2rtc/issues/487
raw = configTemplate(raw)
args.AddCodec(raw)
}
// 2. Process video filters (resize and rotation)
if query["width"] != nil || query["height"] != nil {
filter := "scale="
if query["width"] != nil {
filter += query["width"][0]
} else {
filter += "-1"
}
filter += ":"
if query["height"] != nil {
filter += query["height"][0]
} else {
filter += "-1"
}
args.AddFilter(filter)
}
if query["rotate"] != nil {
var filter string
switch query["rotate"][0] {
case "90":
filter = "transpose=1" // 90 degrees clockwise
case "180":
filter = "transpose=1,transpose=1"
case "-90", "270":
filter = "transpose=2" // 90 degrees counterclockwise
}
if filter != "" {
args.AddFilter(filter)
}
}
for _, drawtext := range query["drawtext"] {
// support templates https://github.com/AlexxIT/go2rtc/issues/487
drawtext = configTemplate(drawtext)
// support default timestamp format
if !strings.Contains(drawtext, "text=") {
drawtext += `:text='%{localtime\:%Y-%m-%d %X}'`
}
args.AddFilter("drawtext=" + drawtext)
}
// 3. Process video codecs
if args.Video > 0 {
for _, video := range query["video"] {
if video != "copy" {
if codec := defaults[video]; codec != "" {
args.AddCodec(codec)
} else {
args.AddCodec(video)
}
} else {
args.AddCodec("-c:v copy")
}
}
}
if query["bitrate"] != nil {
// https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate
b := query["bitrate"][0]
args.AddCodec("-b:v " + b + " -maxrate " + b + " -bufsize " + b)
}
// 4. Process audio codecs
if args.Audio > 0 {
for _, audio := range query["audio"] {
if audio != "copy" {
if codec := defaults[audio]; codec != "" {
args.AddCodec(codec)
} else {
args.AddCodec(audio)
}
} else {
args.AddCodec("-c:a copy")
}
}
}
if query["hardware"] != nil {
hardware.MakeHardware(args, query["hardware"][0], defaults)
}
}
switch {
case args.Video == 0 && args.Audio == 0:
args.AddCodec("-c copy")
case args.Video == 0:
args.AddCodec("-vn")
case args.Audio == 0:
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 ")) {
args.Output = defaults["output/mjpeg"]
}
return args
}