Files produced by WASM-Build bigger than asm.js

[Rillke]

WASM:

XXX@XXX:~/Downloads$ opusinfo encoded.opus
Processing file "encoded.opus"...

New logical stream (#1, serial: 633146a3): type opus
Encoded with libopus 1.2.1
User comments section follows...
	ENCODER=opus-tools/opusenc https://blog.rillke.com/opusenc.js/ from opus-tools 0.1.10-2-g6f67426
	title=Follow me up to Carlow
	artist=Christoph Nolte
	album=The Rocky Road
	date=2009
	genre=Folk
	publisher=Jamendo
	copyright=2009-10-26T12:17:51+01:00 Christoph Nolte. Licensed to the public under http://creativecommons.org/licenses/by-sa/2.0/de/ verify at http://www.jamendo.com/album/54242/
	encoded_by=Jamendo : http://www.jamendo.com | LAME
	TRACKNUMBER=05
	TDTG=2014-05-30T11:51:21
	encoder=Lavf56.15.102
	METADATA_BLOCK_PICTURE=3|image/jpeg||200x200x24|<5348 bytes of image data>
Opus stream 1:
	Pre-skip: 312
	Playback gain: 0 dB
	Channels: 2
	Original sample rate: 44100Hz
	Packet duration:   20.0ms (max),   20.0ms (avg),   20.0ms (min)
	Page duration:   1000.0ms (max),  999.1ms (avg),  840.0ms (min)
	Total data length: 2013265 bytes (overhead: 1.17%)
	Playback length: 2m:51.829s
	Average bitrate: 93.73 kb/s, w/o overhead: 92.64 kb/s
Logical stream 1 ended

ASM.JS

XXX@XXX:~/Downloads$ opusinfo "encoded(1).opus"
Processing file "encoded(1).opus"...

New logical stream (#1, serial: 7eba927d): type opus
Encoded with libopus 1.2.1
User comments section follows...
	ENCODER=opus-tools/opusenc https://blog.rillke.com/opusenc.js/ from opus-tools 0.1.10-2-g6f67426
	title=Follow me up to Carlow
	artist=Christoph Nolte
	album=The Rocky Road
	date=2009
	genre=Folk
	publisher=Jamendo
	copyright=2009-10-26T12:17:51+01:00 Christoph Nolte. Licensed to the public under http://creativecommons.org/licenses/by-sa/2.0/de/ verify at http://www.jamendo.com/album/54242/
	encoded_by=Jamendo : http://www.jamendo.com | LAME
	TRACKNUMBER=05
	TDTG=2014-05-30T11:51:21
	encoder=Lavf56.15.102
	METADATA_BLOCK_PICTURE=3|image/jpeg||200x200x24|<5348 bytes of image data>
Opus stream 1:
	Pre-skip: 312
	Playback gain: 0 dB
	Channels: 2
	Original sample rate: 44100Hz
	Packet duration:   20.0ms (max),   20.0ms (avg),   20.0ms (min)
	Page duration:   1000.0ms (max),  999.1ms (avg),  840.0ms (min)
	Total data length: 1693170 bytes (overhead: 1.34%)
	Playback length: 2m:51.829s
	Average bitrate: 78.83 kb/s, w/o overhead: 77.77 kb/s
Logical stream 1 ended

[Rillke]

Might be worth test building opusenc with 32bit vs 64bit integer support or re-read https://github.com/kripken/emscripten/wiki/WebAssembly more closely.

The output file size produced by both the win32 and the win64 binaries is almost the same as the WASM-build one so it is not too troubling, although still I would like to know what I get in return to bigger opus encoded files and slower encoding speed in Firefox.