[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

1 files changed, 0 insertions, 68 deletions

diff --git a/vendor/github.com/abema/go-mp4/write.go b/vendor/github.com/abema/go-mp4/write.go
deleted file mode 100644
index 72d464444..000000000
--- a/vendor/github.com/abema/go-mp4/write.go
+++ /dev/null
@@ -1,68 +0,0 @@
-package mp4
-
-import (
-	"errors"
-	"io"
-)
-
-type Writer struct {
-	writer  io.WriteSeeker
-	biStack []*BoxInfo
-}
-
-func NewWriter(w io.WriteSeeker) *Writer {
-	return &Writer{
-		writer: w,
-	}
-}
-
-func (w *Writer) Write(p []byte) (int, error) {
-	return w.writer.Write(p)
-}
-
-func (w *Writer) Seek(offset int64, whence int) (int64, error) {
-	return w.writer.Seek(offset, whence)
-}
-
-func (w *Writer) StartBox(bi *BoxInfo) (*BoxInfo, error) {
-	bi, err := WriteBoxInfo(w.writer, bi)
-	if err != nil {
-		return nil, err
-	}
-	w.biStack = append(w.biStack, bi)
-	return bi, nil
-}
-
-func (w *Writer) EndBox() (*BoxInfo, error) {
-	bi := w.biStack[len(w.biStack)-1]
-	w.biStack = w.biStack[:len(w.biStack)-1]
-	end, err := w.writer.Seek(0, io.SeekCurrent)
-	if err != nil {
-		return nil, err
-	}
-	bi.Size = uint64(end) - bi.Offset
-	if _, err = bi.SeekToStart(w.writer); err != nil {
-		return nil, err
-	}
-	if bi2, err := WriteBoxInfo(w.writer, bi); err != nil {
-		return nil, err
-	} else if bi.HeaderSize != bi2.HeaderSize {
-		return nil, errors.New("header size changed")
-	}
-	if _, err := w.writer.Seek(end, io.SeekStart); err != nil {
-		return nil, err
-	}
-	return bi, nil
-}
-
-func (w *Writer) CopyBox(r io.ReadSeeker, bi *BoxInfo) error {
-	if _, err := bi.SeekToStart(r); err != nil {
-		return err
-	}
-	if n, err := io.CopyN(w, r, int64(bi.Size)); err != nil {
-		return err
-	} else if n != int64(bi.Size) {
-		return errors.New("failed to copy box")
-	}
-	return nil
-}