Was testing the streaming feature after i set my quality to high for the stream settings the game crashed.
Here is the stacktrace/error log:

---- Minecraft Crash Report ----
// Don't do that.

Time: 11/21/13 2:27 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at tv.twitch.broadcast.Stream.captureFrameBuffer_ReadPixels(Stream.java:182)
at bui.a(SourceFile:1427)
at buw.k(SourceFile:241)
at azg.af(SourceFile:842)
at azg.e(SourceFile:721)
at net.minecraft.client.main.Main.main(SourceFile:151)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at tv.twitch.broadcast.Stream.captureFrameBuffer_ReadPixels(Stream.java:182)
at bui.a(SourceFile:1427)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bjz['Min3CraftDud3'/1985, l='MpServer', x=-273.83, y=75.10, z=612.09]]
Chunk stats: MultiplayerChunkCache: 333, 333
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-297,68,532), Chunk: (at 7,4,4 in -19,33; contains blocks -304,0,528 to -289,255,543), Region: (-1,1; contains chunks -32,32 to -1,63, blocks -512,0,512 to -1,255,1023)
Level time: 46760912 game time, 1 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 12 total; [ri['entity.ItemFrame.name'/129, l='MpServer', x=-325.50, y=73.50, z=575.06], uv['Chicken'/161, l='MpServer', x=-263.53, y=75.00, z=534.66], ri['entity.ItemFrame.name'/131, l='MpServer', x=-324.50, y=72.50, z=575.06], ri['entity.ItemFrame.name'/130, l='MpServer', x=-325.50, y=72.50, z=575.06], ri['entity.ItemFrame.name'/133, l='MpServer', x=-326.50, y=72.50, z=575.06], ri['entity.ItemFrame.name'/132, l='MpServer', x=-324.50, y=73.50, z=575.06], uv['Chicken'/135, l='MpServer', x=-329.78, y=69.00, z=636.78], bjz['Min3CraftDud3'/1985, l='MpServer', x=-273.83, y=75.10, z=612.09], ri['entity.ItemFrame.name'/134, l='MpServer', x=-326.50, y=73.50, z=575.06], xf['Zombie'/115, l='MpServer', x=-349.53, y=11.00, z=630.97], vd['Pig'/124, l='MpServer', x=-349.94, y=69.00, z=532.53], vz['item.item.egg'/931, l='MpServer', x=-333.72, y=67.13, z=636.88]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Non-integrated multiplayer server
Stacktrace:
at bju.a(SourceFile:284)
at azg.b(SourceFile:1974)
at azg.e(SourceFile:735)
at net.minecraft.client.main.Main.main(SourceFile:151)

– System Details –
Details:
Minecraft Version: 13w47c
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_11, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 275320592 bytes (262 MB) / 405864448 bytes (387 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 10051 (562856 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
IntCache: cache: 0, tcache: 7, allocated: 13, tallocated: 95
Launched Version: 13w47c
LWJGL: 2.9.1
OpenGL: AMD Radeon HD 6450 GL version 4.2.12422 Compatibility Profile Context 13.152.0.0, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1003 (56168 bytes; 0 MB) allocated, 38 (2128 bytes; 0 MB) used
Anisotropic Filtering: Off (1)