I got together all the eps of TWD till now and put them the in one torrent, the source was always the 720p version with most seeds and biggest size(not m720p etc.).



IMMERSE info:
General
Complete name                  : F:SerialeWalking DeadThe.Walking.Dead.S04E01.720p.HDTV.x264-IMMERSE.mkv
Format                         : Matroska
Format version                 : Version 2
File size                      : 2.10 GiB
Duration                       : 43mn 19s
Overall bit rate               : 6 925 Kbps
Writing application            : x264.exe
Writing library                : mkv2rls x264-tv version built on 2011. febr. 17

Video
ID                             : 1
Format                         : AVC
Format/Info                    : Advanced Video Codec
Format profile                 : [email protected]
Format settings, CABAC         : Yes
Format settings, ReFrames      : 5 frames
Codec ID                       : V_MPEG4/ISO/AVC
Duration                       : 43mn 19s
Bit rate                       : 6 404 Kbps
Width                          : 1 278 pixels
Height                         : 720 pixels
Display aspect ratio           : 16:9
Frame rate mode                : Constant
Frame rate                     : 23.976 fps
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Progressive
Bits/(Pixel*Frame)             : 0.290
Stream size                    : 1.94 GiB (92%)
Writing library                : x264 core 138 r2358 9e941d1
Encoding settings              : cabac=1 / ref=5 / deblock=1:-2:-2 / analyse=0x3:0x113 / me=umh / subme=8 / psy=1 / psy_rd=1.05:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=18 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=18.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:0.70
Language                       : English
Default                        : Yes
Forced                         : No

Audio
ID                             : 2
Format                         : AC-3
Format/Info                    : Audio Coding 3
Mode extension                 : CM (complete main)
Format settings, Endianness    : Big
Codec ID                       : A_AC3
Duration                       : 43mn 19s
Bit rate mode                  : Constant
Bit rate                       : 384 Kbps
Channel count                  : 6 channels
Channel positions              : Front: L C R, Side: L R, LFE
Sampling rate                  : 48.0 KHz
Bit depth                      : 16 bits
Compression mode               : Lossy
Stream size                    : 119 MiB (6%)
Language                       : English
Default                        : Yes
Forced                         : No


KILLERS and 2HD are different only in bitrate and encoding settings(and software used), so here is KILLERS' encoding settings:
Encoding settings              : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=18 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=18.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00


and 2HD's:
Encoding settings              : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=19.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00

Will seed it at least till the whole 4th season is complete.