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Issue while rendering with x265


Hello RandomEngy,

i have an issue while encoding with the x265-Codec on an workstation using 2 Intel Xeon (24 logical cores).

The issue occures randomly; all rendering-processes are always finished without an abort, but the created video-file is sometimes only not larger than 200-300MB. So if you just want to play this file (for e.g. on the vlc-player) you will only have the audio-track, but the video-track is missing in the file.

As I said, this issue occures only I think at maybe 30% of all rendering-processes.

I am using Windows 10 Pro, but I´ve tested VidCoder (64 bit) also on Windows 7 Professional and there's the same issue. So I think, the problem could maybe be the 12/24 cores?

I've put a log-file to the attachment.

I hope you can help me there,


file attachments


RandomEngy wrote Nov 7, 2015 at 1:29 AM

Hmm, the log says it completed successfully. Does the same happen with HandBrake?

Mika1313 wrote Nov 23, 2015 at 3:34 AM

Hello Random, thanks for your answer!

I've tested it with Handbrake and sometimes it occured the same error (see the above description).

I've got the suspicion that the number of cores on which I render the videos is not supported by the x265 codec (or something else).

For now I am running Windows 7 on my Workstation (12 cores / 24 logical cores). On the system-start-options I changed the value for cores that should be used to only 7 cores (this is the highest value which is possible to solve my problem). If I use 8-12 cores, the descripted error occures sometimes.

Do you know if I could use a program which starts VidCoder two times with each 6 cores? (Do you know if such a program even exists?)

Thanks for bothering!


RandomEngy wrote Nov 24, 2015 at 10:32 PM

In Options -> Processes, you can enable CPU throttling, which prevents it from running on some cores. That might help here.