[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

13 files changed, 21 insertions, 5 deletions

diff --git a/testrig/config.go b/testrig/config.go
index 30beaa910..ed98798d6 100644
--- a/testrig/config.go
+++ b/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.
diff --git a/testrig/media/cowlick-small.jpeg b/testrig/media/cowlick-small.jpeg
index b3cd2f647..4061653ab 100644
--- a/testrig/media/cowlick-small.jpeg
+++ b/testrig/media/cowlick-small.jpeg
diff --git a/testrig/media/kip-static.png b/testrig/media/kip-static.png
index 1ba296687..c60b94c5c 100644
--- a/testrig/media/kip-static.png
+++ b/testrig/media/kip-static.png
diff --git a/testrig/media/ohyou-small.jpg b/testrig/media/ohyou-small.jpg
index f561884d1..c862be1ff 100755..100644
--- a/testrig/media/ohyou-small.jpg
+++ b/testrig/media/ohyou-small.jpg
diff --git a/testrig/media/rainbow-static.png b/testrig/media/rainbow-static.png
index 79ed5c03a..f762a0470 100755..100644
--- a/testrig/media/rainbow-static.png
+++ b/testrig/media/rainbow-static.png
diff --git a/testrig/media/sloth-small.jpg b/testrig/media/sloth-small.jpg
index 2787d535c..60f64a2fd 100644
--- a/testrig/media/sloth-small.jpg
+++ b/testrig/media/sloth-small.jpg
diff --git a/testrig/media/team-fortress-small.jpg b/testrig/media/team-fortress-small.jpg
index f6773b9a0..8615834b6 100644
--- a/testrig/media/team-fortress-small.jpg
+++ b/testrig/media/team-fortress-small.jpg
diff --git a/testrig/media/thoughtsofdog-small.jpg b/testrig/media/thoughtsofdog-small.jpg
index 98801d235..5f303f939 100644
--- a/testrig/media/thoughtsofdog-small.jpg
+++ b/testrig/media/thoughtsofdog-small.jpg
diff --git a/testrig/media/trent-small.jpg b/testrig/media/trent-small.jpg
index 726c1aed0..4e9ac26b6 100755..100644
--- a/testrig/media/trent-small.jpg
+++ b/testrig/media/trent-small.jpg
diff --git a/testrig/media/welcome-small.jpg b/testrig/media/welcome-small.jpg
index b1a585169..04179ccc9 100755..100644
--- a/testrig/media/welcome-small.jpg
+++ b/testrig/media/welcome-small.jpg
diff --git a/testrig/media/yell-static.png b/testrig/media/yell-static.png
index 9b5d2837e..b60b9f62b 100644
--- a/testrig/media/yell-static.png
+++ b/testrig/media/yell-static.png
diff --git a/testrig/media/zork-small.jpg b/testrig/media/zork-small.jpg
index 60be12564..e8fffe9cb 100644
--- a/testrig/media/zork-small.jpg
+++ b/testrig/media/zork-small.jpg
diff --git a/testrig/testmodels.go b/testrig/testmodels.go
index 90c200585..5f41ed190 100644
--- a/testrig/testmodels.go
+++ b/testrig/testmodels.go
@@ -1028,7 +1028,7 @@ func NewTestAttachments() map[string]*gtsmodel.MediaAttachment {
 			Thumbnail: gtsmodel.Thumbnail{
 				Path:        "01F8MH5ZK5VRH73AKHQM6Y9VNX/attachment/small/01FVW7RXPQ8YJHTEXYPE7Q8ZY0.jpg",
 				ContentType: "image/jpeg",
-				FileSize:    19312,
+				FileSize:    11751,
 				URL:         "http://localhost:8080/fileserver/01F8MH5ZK5VRH73AKHQM6Y9VNX/attachment/small/01FVW7RXPQ8YJHTEXYPE7Q8ZY0.jpg",
 				RemoteURL:   "http://fossbros-anonymous.io/attachments/small/a499f55b-2d1e-4acd-98d2-1ac2ba6d79b9.jpg",
 			},
@@ -1205,7 +1205,7 @@ func NewTestEmojis() map[string]*gtsmodel.Emoji {
 			ImageContentType:       "image/png",
 			ImageStaticContentType: "image/png",
 			ImageFileSize:          36702,
-			ImageStaticFileSize:    10413,
+			ImageStaticFileSize:    6092,
 			Disabled:               util.Ptr(false),
 			URI:                    "http://localhost:8080/emoji/01F8MH9H8E4VG3KDYJR9EGPXCQ",
 			VisibleInPicker:        util.Ptr(true),
@@ -1227,7 +1227,7 @@ func NewTestEmojis() map[string]*gtsmodel.Emoji {
 			ImageContentType:       "image/png",
 			ImageStaticContentType: "image/png",
 			ImageFileSize:          10889,
-			ImageStaticFileSize:    10808,
+			ImageStaticFileSize:    8965,
 			Disabled:               util.Ptr(false),
 			URI:                    "http://fossbros-anonymous.io/emoji/01GD5KP5CQEE1R3X43Y1EHS2CW",
 			VisibleInPicker:        util.Ptr(false),