[feature] support processing of (many) more media types (#3090)

* initial work replacing our media decoding / encoding pipeline with ffprobe + ffmpeg

* specify the video codec to use when generating static image from emoji

* update go-storage library (fixes incompatibility after updating go-iotools)

* maintain image aspect ratio when generating a thumbnail for it

* update readme to show go-ffmpreg

* fix a bunch of media tests, move filesize checking to callers of media manager for more flexibility

* remove extra debug from error message

* fix up incorrect function signatures

* update PutFile to just use regular file copy, as changes are file is on separate partition

* fix remaining tests, remove some unneeded tests now we're working with ffmpeg/ffprobe

* update more tests, add more code comments

* add utilities to generate processed emoji / media outputs

* fix remaining tests

* add test for opus media file, add license header to utility cmds

* limit the number of concurrently available ffmpeg / ffprobe instances

* reduce number of instances

* further reduce number of instances

* fix envparsing test with configuration variables

* update docs and configuration with new media-{local,remote}-max-size variables

testrig/config.go

@@ -18,6 +18,7 @@
 package testrig
 
 import (
+	"context"
 	"os"
 	"strconv"
 	"time"
@@ -26,8 +27,23 @@ import (
 	"github.com/coreos/go-oidc/v3/oidc"
 	"github.com/superseriousbusiness/gotosocial/internal/config"
 	"github.com/superseriousbusiness/gotosocial/internal/language"
+	"github.com/superseriousbusiness/gotosocial/internal/media/ffmpeg"
 )
 
+func init() {
+	ctx := context.Background()
+
+	// Ensure global ffmpeg WASM pool initialized.
+	if err := ffmpeg.InitFfmpeg(ctx, 1); err != nil {
+		panic(err)
+	}
+
+	// Ensure global ffmpeg WASM pool initialized.
+	if err := ffmpeg.InitFfprobe(ctx, 1); err != nil {
+		panic(err)
+	}
+}
+
 // InitTestConfig initializes viper
 // configuration with test defaults.
 func InitTestConfig() {
@@ -86,11 +102,11 @@ func testDefaults() config.Configuration {
 		AccountsAllowCustomCSS:   true,
 		AccountsCustomCSSLength:  10000,
 
-		MediaImageMaxSize:        10485760, // 10MiB
-		MediaVideoMaxSize:        41943040, // 40MiB
 		MediaDescriptionMinChars: 0,
 		MediaDescriptionMaxChars: 500,
 		MediaRemoteCacheDays:     7,
+		MediaLocalMaxSize:        40 * bytesize.MiB,
+		MediaRemoteMaxSize:       40 * bytesize.MiB,
 		MediaEmojiLocalMaxSize:   51200,          // 50KiB
 		MediaEmojiRemoteMaxSize:  102400,         // 100KiB
 		MediaCleanupFrom:         "00:00",        // midnight.