I have a "small" video file of 159 GB (real GB). It is a 25h recording of a "lots of concerts" day on our public broadcast channel "3sat" in Germany, DVB-S2 50 fps 1280x720.
Edit: I tried Avidemux 2.6.13 first which failed, and then upgraded to 2.6.21
When opening it with Avidemux 2.6.21 x64 I end up with 11h59m33s instead of 25h14m55s. Which matches pretty close 76 GB of those 159 GB.
It scans for quite a while, counts up to 4'540'000 Images, which matches the 25h14m exactly. But still only about 12h are shown in Avidemux.
If you need that oversized video file for testing, I can put it up on my homepage.
Throwing that file through ffmpeg with "copy stream" method may help, I am testing it. And if that doesn't work (suspecting the same 12h Limit) I'll use ffmpeg to cut it into pieces, so Avidemux can handle it for sure.
Sending the .ts through ffmpeg worked (ffmpeg -i c:\tmp\musik.ts -map 0:0 -map 0:3 -c:v copy -c:a copy C:\tmp\test.mkv).
Result is a 132 GB .mkv.
Now Avidemux opens the whole file and sees the whole 25h.
There are some stream errors (it is a .ts from DVB-S2, what to expect), but at different times, far away from 12h mark:
[mpegts @ 00000000026f24a0] PES packet size mismatch0:15:12.33 bitrate=12091.2kbits/s
[mpegts @ 00000000026f24a0] PES packet size mismatch8:26:14.23 bitrate=12344.1kbits/s
[mpegts @ 00000000026f24a0] PES packet size mismatch18:11:30.45 bitrate=12519.4kbits/s
[mpegts @ 00000000026f24a0] PES packet size mismatch18:15:05.01 bitrate=12521.0kbits/s
[mpegts @ 00000000026f24a0] PES packet size mismatch18:22:46.91 bitrate=12509.2kbits/s
[mpegts @ 00000000026f24a0] PES packet size mismatch18:35:24.93 bitrate=12512.1kbits/s
[mpegts @ 00000000026f24a0] PES packet size mismatch19:08:20.37 bitrate=12508.7kbits/s
[mpegts @ 00000000026f24a0] PES packet size mismatch24:36:55.79 bitrate=12559.8kbits/s
[mpegts @ 00000000026f24a0] PES packet size mismatch24:45:12.89 bitrate=12560.5kbits/s
Probably a counter wrapping somewhere
This is an unusual file , dont expect a quick fix :)
Setsunaaa, if you're fast - nearly all concerts are availiable in the 'Mediathek' and can be downloaded easily with jDownloader or MediathekView - no need to encode them again ;)