Problems with a FLV file (size/stream time)

[aquadark]

Hello, I have a problem with a .flv file I downloaded some time ago (not available anymore online). It's nearly 1GB large, should be around an hour in length, but only plays for 29 seconds in the beginning. MPC displays 28:11 as its duration, but can't seek beyond those first 29 secs.
The video file FLV Extract outputs is a ~7mb .264
Is there anything that can be done to repair this FLV file? Rebuilding it with avidemux crashes the program...

Thank you!

Here is the MediaInfo log:

General
Complete name                            : C:\65930.flv
Format                                   : Flash Video
File size                                : 1 011 MiB
Duration                                 : 1h 7mn
Overall bit rate                         : 2 101 Kbps
Tagged date                              : UTC 2012-05-17 00:03:05
Tagging application                      : flvmeta 1.1-gb899474

Video
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.0
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 4 frames
Codec ID                                 : 7
Duration                                 : 1h 7mn
Bit rate                                 : 1 773 Kbps
Width                                    : 720 pixels
Height                                   : 576 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Constant
Frame rate                               : 25.047 fps
Standard                                 : PAL
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.171
Stream size                              : 6.25 MiB (1%)
Writing library                          : x264 core 120 r2120 0c7dab9
Encoding settings                        : cabac=1 / ref=4 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=8 / psy=0 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=24 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=0 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=125 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc=crf / mbtree=0 / crf=22.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / pb_ratio=1.30 / aq=1:1.00

Audio
Format                                   : MPEG Audio
Format version                           : Version 1
Format profile                           : Layer 3
Mode                                     : Joint stereo
Mode extension                           : MS Stereo
Codec ID                                 : 2
Codec ID/Hint                            : MP3
Duration                                 : 1h 7mn
Bit rate mode                            : Constant
Bit rate                                 : 128 Kbps
Channel(s)                               : 2 channels
Sampling rate                            : 44.1 KHz
Compression mode                         : Lossy
Delay relative to video                  : 80ms
Stream size                              : 462 KiB (0%)

[Baldrick]

You could try remux with yamb or mymp4boxgui(open flv and make a mp4) or reconvert to some other format with xmedia recode, handbrake, etc.

But I guess it will fail also. You coould then try video repair tool or www.mp4repair.org. But they aren't free.

[aquadark]

Thank you for trying to help out. Unfortunately, everything suggested failed one way or the other... :/