I just streamed your video and monitored the stream as a viewer. No audio issue at all for the full length of the outro.
Review your settings and monitor your task manager/hardware monitoring application for abnormalities.
Check your sample rate setting specifically. Your video is encoded@48kHz this could lead to issues when it doesn't match the settings in your host application.
Technical information:
20:25:16.659: CPU Name: Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz
20:25:16.659: CPU Speed: 4000MHz
20:25:16.659: Physical Cores: 4, Logical Cores: 8
20:25:16.659: Physical Memory: 16286MB Total, 11857MB Free
20:25:16.659: Windows Version: 6.3 Build 9600 (revision: 17415)
20:25:16.659: Aero is Enabled (Aero is always on for windows 8 and above)
20:25:16.666: OBS 0.13.4 (64bit, windows)
20:25:16.666: ---------------------------------
20:25:16.666: ---------------------------------
20:25:16.666: audio settings reset:
20:25:16.666: samples per sec: 44100
20:25:16.666: speakers: 2
20:25:16.976: ---------------------------------
20:25:16.977: Initializing D3D11..
20:25:16.977: Available Video Adapters:
20:25:16.977: Adapter 1: NVIDIA GeForce GTX 970
20:25:16.977: Dedicated VRAM: 4169007104
20:25:16.977: Shared VRAM: 4243658752
20:25:16.977: output 1: pos={0, 0}, size={1920, 1200}, attached=true
20:25:16.977: output 2: pos={-1920, 0}, size={1920, 1080}, attached=true
20:25:16.977: output 3: pos={-3200, 0}, size={1280, 1024}, attached=true
20:25:16.979: Loading up D3D11 on adapter NVIDIA GeForce GTX 970 (0)
20:25:16.990: D3D11 loaded sucessfully, feature level used: 45056
20:25:17.360: ---------------------------------
20:27:12.033: video settings reset:
20:27:12.033: base resolution: 1280x720
20:27:12.033: output resolution: 1280x720
20:27:12.033: fps: 30/1
20:27:12.033: format: NV12
20:27:12.035: Settings changed (stream 1, outputs, video)
20:27:12.035: ------------------------------------------------
20:31:35.068: [Media Source 'Medienquelle']: settings:
20:31:35.068: input: C:/Users/X/Downloads/Outro.mp4
20:31:35.068: input_format: (null)
20:31:35.068: is_looping: no
20:31:35.068: is_forcing_scale: yes
20:31:35.068: is_hw_decoding: yes
20:31:35.068: is_clear_on_media_end: yes
20:31:35.068: restart_on_activate: yes
20:31:41.361: source 'Szene 1' (scene) created
20:33:35.604: ---------------------------------
20:33:35.604: [x264 encoder: 'simple_h264_stream'] preset: veryfast
20:33:35.604: [x264 encoder: 'simple_h264_stream'] profile: main
20:33:35.604: [x264 encoder: 'simple_h264_stream'] settings:
20:33:35.604: bitrate: 2500
20:33:35.604: buffer size: 2500
20:33:35.604: crf: 0 (0 when CBR is enabled)
20:33:35.604: fps_num: 30
20:33:35.604: fps_den: 1
20:33:35.604: width: 1280
20:33:35.604: height: 720
20:33:35.604: keyint: 60
20:33:35.604: vfr: off
20:33:35.604: cbr: on
20:33:35.612: [Media Foundation AAC: 'simple_aac']: encoder created
20:33:35.612: bitrate: 160
20:33:35.612: channels: 2
20:33:35.612: sample rate: 44100
20:33:35.612: bits-per-sample: 16
20:33:35.612:
20:33:35.612: [rtmp stream: 'simple_stream'] Connecting to RTMP URL rtmp://live-fra.twitch.tv/app...
20:33:35.639: [rtmp stream: 'simple_stream'] Interface: Intel(R) Ethernet-Verbindung I217-V (ethernet, 1000 mbps)
20:33:37.317: [rtmp stream: 'simple_stream'] Connection to rtmp://live-fra.twitch.tv/app successful
20:33:37.318: ==== Streaming Start ===============================================
20:36:39.882: source 'Text (FreeType 2)' (text_ft2_source) created
20:38:57.112: [rtmp stream: 'simple_stream'] User stopped the stream
20:38:57.131: Output 'simple_stream': stopping
20:38:57.131: Output 'simple_stream': Total encoded frames: 936695694
20:38:57.131: Output 'simple_stream': Total drawn frames: 9645
20:38:57.131: Output 'simple_stream': Number of skipped frames due to encoding lag: 3753733201 (400.7%)
20:38:57.131: ==== Streaming Stop ================================================
20:41:39.523: adding 23 milliseconds of audio buffering, total audio buffering is now 69 milliseconds