Where did the file come from?
Have you got all codecs installed that are available?
I can play some, but not all .ts files on my old machine with a single core sempron 2400+ cpu; fully HD files seem to be the problem, simply because my machine is not powerful enough.
I can use VLC, which is my main choice for videos, but mplayer works, as do gnome-mplayer, smplayer, and probably others, but not totem or banshee for some reason.
The .ts suffix does not tell you what the file really as it is just a "container" for media files. Try running mediainfo for all details of the files included. As an example, here's the detailed output of one of my .ts files, recorded onto usb on my digital TV from a broadcast by the BBC.
Code:
user@Lucid:~/Videos/BBC_iPlayer$ mediainfo The\ Story\ of\ Musicals-1.ts
General
ID : 4171 (0x104B)
Complete name : The Story of Musicals-1.ts
Format : BDAV
Format/Info : Blu-ray Video
File size : 1.93 GiB
Duration : 1h 1mn
Start time : UTC 2012-01-05 23:00:04
End time : UTC 2012-01-06 00:02:03
Overall bit rate mode : Variable
Overall bit rate : 4 458 Kbps
Network name : Oxon & Bucks
Original network name : UK Digital Terrestrial Television
Country : GBR
Timezone : +00:00:00
Video
ID : 401 (0x191)
Menu ID : 4544 (0x11C0)
Format : MPEG Video
Format version : Version 2
Format profile : Main@Main
Format settings, BVOP : Yes
Format settings, Matrix : Custom
Codec ID : 2
Duration : 1h 1mn
Bit rate mode : Variable
Bit rate : 4 015 Kbps
Maximum bit rate : 15.0 Mbps
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 16:9
Active Format Description : Letterbox 16:9 image, with alternative 14:9 center
Frame rate : 25.000 fps
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Top Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.387
Stream size : 1.74 GiB (90%)
Audio
ID : 402 (0x192)
Menu ID : 4544 (0x11C0)
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 2
Codec ID : 3
Duration : 1h 1mn
Bit rate mode : Constant
Bit rate : 256 Kbps
Channel(s) : 2 channels
Sampling rate : 48.0 KHz
Compression mode : Lossy
Delay relative to video : -263ms
Stream size : 114 MiB (6%)
Language : English
Text
ID : 405 (0x195)
Menu ID : 4544 (0x11C0)
Format : DVB Subtitle
Codec ID : 6
Duration : 1h 1mn
Delay relative to video : 5s 994ms
Language : English
Menu
ID : 400 (0x190)
Menu ID : 4544 (0x11C0)
Duration : 1h 1mn
List : 401 (0x191) (MPEG Video) / 402 (0x192) (MPEG Audio, English) / 405 (0x195) (DVB Subtitle, English)
Language : / English / English
Service name : BBC FOUR
Service provider : BBC
Service type : digital television
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