Cannot Seek/Fast-Foward MKV Video

[cebao]

When you cannot seek/Fast-Foward a mkv video, the unique solution is re-encode, or there is times it could be a codec problem ?

The details of the video below

Video: MPEG4 Video (H264) 1280x720 25fps 399kbps [V: h264 high L3.1, yuv420p, 1280x720, 399 kb/s]
Audio: AAC 44100Hz stereo 95kbps [A: aac, 44100 Hz, stereo, 95 kb/s]

Video
Format                         : AVC
Format/Info                    : Advanced Video Codec
Format profile                 : High@L3.1
Format settings, CABAC         : Yes
Format settings, ReFrames      : 4 frames
Codec ID                       : 7
Bit rate                       : 390 Kbps
Width                          : 1 280 pixels
Height                         : 720 pixels
Display aspect ratio           : 16:9
Frame rate mode                : Constant
Frame rate                     : 25.000 fps
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Progressive
Bits/(Pixel*Frame)             : 0.017

[ndjamena]

Generally, when you cannot seek in an MKV it's because whatever program made the file was disturbed before it finished and it never managed to write the index into the file. The BEST solution is not to re-encode (unless you mean start over again from the original source, that really is the best solution), it's to remux it with MKVMerge. But if the file was never completed, it's likely there's something missing from the end, so you really ought to just start all over again.

[poisondeathray]

or player issue... are you using VLC? Can you seek in other players?
https://trac.bunkus.org/wiki/FAQ%3APlaybackDoesNotWorkVLCCannotSeekMkvmerge590

[ndjamena]

If you follow the links those bugs in VLC have been fixed, but they might still exist in other players...

[cebao]

Well, my default player is MPC HC 1.7.4 but I tryed to play it on VLC (dummy option enabled and disabled). Re-encoding to .mp4 always solved mine issues about this, but I always asked why it happened. I thought it was codecs, but after updated them, no solution. Now after reading yours replies, which I thank you, downloading the MKVMerge solved it and it was a lot faster than re-encoding. Thank you.