I have a small HP server (ProLiant MicroServer Gen8) and I use it to make surveillance camera recordings. The on-board graphics were quite weak, so I added a GeForce GT730 and installed the latest nVidia drivers for it. I did not change any settings in iSpy, but the resulting video files are now roughly 10x in size.
The quality looks the same, the frame rate and the resolution is also the same. What can be the reason of this? I included the file info I obtained using MPC-HC (old, new), I also copy the differing fields here:
old file new file
File size : 19.6 MiB 185 MiB
Duration : 15 min 1 s 14 min 44 s
Overall bit rate : 183 kb/s 1 758 kb/s
Writing application : Lavf57.56.100 Lavf57.83.100
Format settings, GOP : (no data) N=1
Duration : 15 min 1 s 14 min 44 s
Bit rate : 182 kb/s 1 757 kb/s
Frame rate : 4.358 FPS 4.565 FPS
Bits/(Pixel*Frame) : 0.136 1.253
Stream size : 19.5 MiB (100%) 185 MiB (100%)
Writing library : x264 core 148 r2721 72d53ab x264 core 152 r2851 ba24899
Encoding settings :
old: cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=3 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=16 / qpmax=26 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
new: cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=3 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00