Imports github.com/abema/go-mp4 github.com/aler9/writerseeker github.com/bogem/id3v2/v2 github.com/go-flac/flacpicture github.com/go-flac/flacvorbis github.com/go-flac/go-flac github.com/sunfish-shogi/bufseekio Standard library imports bytes encoding/base64 encoding/binary errors fmt image image/jpeg image/png io os reflect strconv strings sync