.mkv file cannot play

Most of my .mkv files play well in my WD TV.What can be the reason?

please post more info

First bit of advice however …

download and install Mediainfo to investigate the video file that will not play.

http://mediaarea.net/en/MediaInfo

(select “tree” view for detailed info … then file > export > Text > Save)

Then copy and paste the info here on the forum … *example below*)

General
Unique ID                                : 58096529997295284627125864781800095217 (0x2BB4FC13E6E00F8F9C70CC566B593DF1)
Complete name                            : E:\5.1 DolbyDigital Test Tool.mkv
Format                                   : Matroska
Format version                           : Version 2
File size                                : 31.5 MiB
Duration                                 : 48s 648ms
Overall bit rate                         : 5 430 Kbps
Movie name                               : Avidemux
Writing application                      : Lavf53.24.0
Writing library                          : Lavf53.24.0
AUTHOR                                   : Avidemux

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 4 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 48s 649ms
Bit rate                                 : 4 874 Kbps
Width                                    : 1 280 pixels
Height                                   : 720 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 29.970 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.176
Stream size                              : 28.3 MiB (90%)
Writing library                          : x264 core 120 r2120 0c7dab9
Encoding settings                        : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / 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=3 / 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=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=15.0 / qcomp=0.60 / qpmin=0 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Default                                  : Yes
Forced                                   : No
Matrix coefficients                      : SMPTE 240M

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                                 : 48s 648ms
Bit rate mode                            : Constant
Bit rate                                 : 448 Kbps
Channel(s)                               : 6 channels
Channel positions                        : Front: L C R, Side: L R, LFE
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
Compression mode                         : Lossy
Delay relative to video                  : -1mn 5s
Stream size                              : 2.60 MiB (8%)
Default                                  : Yes
Forced                                   : No