Bug Report Quicksync artifacts problem

[chummy]

Hi, i'm testing OBS-MP last days for local recording only and it worked fine with x264 and AMD VCE using these settings:

Profile: main
Keyframe: 10
CBR: 50000
buffer size:50000
Advanced: checked
B-frame:0
Minium QP:10
Maximum QP:25

I trying settings like these in Quicksync, but Quicksync keeps producing videos with artifacts. I already tried with Keyframes to 0(auto) and same problem. My Quicksync HW is HD 4600. What settings can i change for Quicksync make a video without image corruptions? Some advise would be appreciated.

Thanks.

 

[Isegrim]

What do you mean by artifacts? I'm getting a green video with lots of artifacts if i use anything above the baseline profile.

 

[chummy]

It occur in many forms of image distortion, i dont know how to express the real name to it, corruption, artifacts, image distortion. I tried using 2 b-frames and the video becomes green like you.

Researching about image artifacts i discover some people do it for art, calling databending.

My videos become 90% of the time with normal quality but random parts the corruption occurs and look like this:
http://forum.videohelp.com/images/guides/p1890577/glitch_example.jpg

I was thinking maybe that is a new feature art from OBS-MP.

Edited: I just tried original OBS and Quicksync produced a footage without image corruptions. I already tried baseline,main, High and some mix of settings and all of them create image artifacts with Quicksync in OBS-MP.

 

[Martin Borgman]

I have the exact same issue. Random artifacts for about half a second to a second as shown in your screenshot there. The interval seems to be around 2-3 min more or less. I'm on an Intel 2500K HD3000 chip for Quicksync. And similar to you, OBS doesn't have issues at all compared to OBS Studio

Profile: high (used all of em same result)
Keyframe: 2
CBR: 9000 - 60000 (various bitrates tested, I usually record at 24000 or 30000)
buffer size:auto or at double bitrate up to 30000 (tested various settings here as well)
Advanced: checked
B-frame:2
Minium QP:2
Maximum QP:20

MP4 @ 30FPS

Intel 2500K HD3000
16Gb DDR3 1600
Windows 7 Ultimate
ATI HD5870 1Gb

Tried recording to a Samsung Spinpoint 1TB 7200RPM, an USB2.0 Western Digital 2TB and a RAID0 2x Western Digital Raptor 36Gb drives at 10.000RPM. All drive setups cause this artifact interval...


I can create compilations to some extent, if it doesn't artifact during the cool stuff. However, LongPlay's are kinda annoying to record with the blocky blocks on screens randomly :( I guess I'll have to go back to OBS, too bad as I really enjoy the dual soundcard option and multi audio channels...

 

[chummy]

I have the exact same issue. Random artifacts for about half a second to a second as shown in your screenshot there. The interval seems to be around 2-3 min more or less. I'm on an Intel 2500K HD3000 chip for Quicksync. And similar to you, OBS doesn't have issues at all compared to OBS Studio

OBS-studio is the best choice for me because it has support to 3rd party hooks like FRAPS and Afterburner while old OBS not work with this.

From what i discovered Quicksync in OBS-studio is working through 3rd party Microsoft Media foundation and only officially support Haswell and above. Yet i use Haswell processor but the problem happens to me.

Only thing to do is wait future implementation of old Quicksync in Studio version.

 

[Martin Borgman]

Yeah it was the multichannel audio that made me prefer Studio. Also the interface itself was more streamlined, but that is more of a luxury thing :D

For now I'm now back on 64bits OBS and Audacity...

 

[Chaskerr4]

I think the issue is that when you create a buffer using quicksync it's not starting with a keyframe and results in artifacts on the first few frames. Using software (x264) it does set key_frame.

Here's the first frame of the .FLV buffer file created use QucikSync. From FFProbe.

[FRAME]
media_type=video
stream_index=0
key_frame=0
pkt_pts=583
pkt_pts_time=0.583000
pkt_dts=583
pkt_dts_time=0.583000
best_effort_timestamp=583
best_effort_timestamp_time=0.583000
pkt_duration=16
pkt_duration_time=0.016000
pkt_pos=576415
pkt_size=14626
width=1280
height=720
pix_fmt=yuv420p
sample_aspect_ratio=1:1
pict_type=B
coded_picture_number=39
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
[/FRAME]

Using software, that first FRAME has key_frame=1 and there's no artifacts.