[FFmpeg-user] Different audio lengths when converting nellymoser to WAV

[Eli Greenberg]

Question for all you smart people. I'm trying to use FFmpeg to convert 
some nellymoser audio to a .wav file. However, when the .wav file is 
produced it is a different length than the nellymoser audio. What would 
cause this?

Terminal output:
   Duration: 01:03:50.37, start: 0.000000, bitrate: 483 kb/s
     Stream #0:0: Video: h264 (Main), yuv420p, 1024x768 [SAR 1:1 DAR 
4:3], 15 tbr, 1k tbn, 30 tbc
     Stream #0:1: Audio: nellymoser, 8000 Hz, mono, s16
Output #0, wav, to 'test.wav':
   Metadata:
     encoder         : Lavf54.2.100
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 8000 Hz, 
mono, s16, 128 kb/s
Stream mapping:
   Stream #0:1 -> #0:0 (nellymoser -> pcm_s16le)
Press [q] to stop, [?] for help
Input stream #0:1 frame changed from rate:8000 fmt:s16 ch:1 to rate:5512 
fmt:s16 ch:1
Input stream #0:1 frame changed from rate:5512 fmt:s16 ch:1 to rate:8000 
fmt:s16 ch:1
size=   52040kB time=00:55:30.57 bitrate= 128.0kbits/s
video:0kB audio:52040kB global headers:0kB muxing overhead 0.000086%