Question / Help MP4-video with blank properties

V

Vegoraptor

New Member
Over the course of the last weeks, I regularly got files that were not playable, neither in WMP nor VLC. Since these files were test recordings up to this point, I wasn't too concerned and thought this might have been due to them being too short (< 5 sec.) for being properly encoded. Last night, however, one of my actual recordings got corrupted. I already read into it on the forums, but unlike any posts I found, my video is neither exceptionally large nor long (3.3 GB; ~25 min.). As it turns out, the properties of the file seem to have been left out, leading to the left detail screen:
Problem.png
Reference.png

Sorry for german, but I think you get what I mean. The right one belongs to the file recorded directly afterwards, without any changes whatsoever.
OBS didn't crash, neither did my PC, and the format is .mp4 recorded via x264.
Logically, my questions are:
1. Does anyone know a way to recreate the missing properties (I already tried the tools from videohelp.com and grauonline.de, none did work)
2. Did I do something wrong? How can I prevent something like that from happening in the future?
 
Boildown

Boildown

Active Member
If OBS didn't crash, and you allowed OBS enough time to save the file once you stopped recording, then it should work. Post a log file. If you're not using CFR, that's the problem. Many players and just about every video editor requires constant frame rate.

If its repeatable, make a small example file and post it to a file sharing site so we can see for ourselves.
 
Boildown

Boildown

Active Member
Hah no, 3GB is too much. There's nothing in the log that I can see that would indicate any problems in the 1420 entry.

You should restore your scene buffering time to the default of 700 though. And why are you setting the base resolution lower instead of setting it to your monitor size and using a downscale? Why are you downscaling at all if you're just saving to disk? But none of these should result in a corrupted file.

Another thing, when playing it, let is sit there for a while. You're using a very high bitrate (CRF=10) and apparently its also a big file (3GB). Give your player a minute to start playback, I notice it takes longer on my largest files. That CRF is probably overkill by the way, CRF=15 would likely look identical and save you some hard drive space.
 
V

Vegoraptor

New Member
My monitor is, as you have already seen, 16:10, while I need the standard 16:9 format for my recordings, and I can't get it to letterbox properly, it always tears the picture. And since 720 is the next lower "magic-p-number", I'm going with that. Personally I don't really see a difference from 1600x900 and downscaling, directly or afterwards with Handbrake, or CRF=15, but a friend of mine, who is way more pampered when it comes to video quality, assured me several times that there was a visible difference.
Gonna try .flv and CRF=15 next time, I wonder if he notices...
Also, it's not like the player loads for a long time, it instantly prompted that it was unable to play the file.
 
You must log in or register to reply here.
Top