OBS created VFR video out of sync-vegas in sync -Resolve

Marco. wrote on 5/9/2019, 2:39 AM

Which Vegas Pro version and which build of it do you use? Do you have the "Favour audio sync" option for VFR clips enabled in Options/Preferences/General?

This file plays perfectly in sync here in Vegas Pro 16 build 424. But this is of cost of freeze frames of which two horrible long then will appear. And this is exactly what MediaInfo tells about the clip. There are frames with a 0.5 fps frame rate (lasting 2 seconds). The price you have to pay for using VFR video.

Former user wrote on 5/9/2019, 3:22 AM

Which Vegas Pro version and which build of it do you use? Do you have the "Favour audio sync" option for VFR clips enabled in Options/Preferences/General?

i have vegas 15 (416) I don't seem to have that option.I don't see the 2second delays within vegas, it just jumps immediately to next frame. That would explain why i don't normally have a problem editing these OBS videos when the OBS encoding works fine, but maybe high cpu or some other bottleneck caused this encoding error and Vegas cant' deal with it.

j-v wrote on 5/9/2019, 3:29 AM

I played also your file in my Vegas Pro 16 build 424 on laptop from signature. Nothing looks strange to me, the video plays normal. Where do I have to look to see the strange things?
I made a screengrab of playing your video and recorded it with OBS (QSV).
Look here for that screengrab

Marco. wrote on 5/9/2019, 4:02 AM

This option was not yet available in V15, it came in version 16 and was optimized in the latest build 424 of version 16.

Former user wrote on 5/9/2019, 4:12 AM

Yes, your vegas is respecting the VFR, and repeating frames to fill in what's missing. My vegas 15 (416) doesn't acknowledge vfr frame lengths. I also notice both your vegas and mine automatically sets project properties to 27.363 while Resolve sets to 29.97. What is more correct? given that you wouldn't be encoding at 27.363, you've decided to encode at 25fps, would that give best results?

j-v wrote on 5/9/2019, 4:25 AM

That's indeed a big change in 16 latest build.
There you can see the program recognizes and set automatic ( with me) the projectproperties to 25p and not as also in your Vpro 15 to a variable framerate and chooses the most fastest. See my screenshot of VPro 15 latest build

wwaag wrote on 5/9/2019, 10:14 AM

In the next version of HappyOtterScripts, I've included a DuplicateFrameFinder script that adds markers back to the timeline where duplicates are found. Here is a screengrab of the results using V16 Build 424. I set the project frame rate at 30 fps which is nominal frame rate reported by MediaInfo.

The two areas with "lots" of duplicates can easily be seen. While the occasional duplicate can easily be fixed through interpolation, I have no idea what could be done except adding b-roll footage where those duplicates occur.

Former user wrote on 5/9/2019, 3:29 PM

The Twitch streamer has a fault with their streaming setup that they need to fix: Obs config, hardware or software, perhaps even network. As you say restoration of 2seconds blocks of missing video isn't feasible it's up to broadcaster to deliver correct content, but it's really great to see the missing/repeated frames represented like this.

I didn't think v16 added enough for me to bother upgrading due to all the bugs also introduced, but being able to keep 'faulty' VFR files in sync is a significant upgrade feature for some of what I do

Musicvid wrote on 5/9/2019, 3:59 PM

Why create vfr in OBS?

Part of the reason OBS is recommended for Vegas, is constant frame rate as a user setting.

Did something change?

Former user wrote on 5/9/2019, 4:59 PM

You would never choose VFR for local screen recording. OBS VFR with VBR seems very common with live streaming encodes. I'm not entirely sure it's necessary anymore as 6mbit is common for twitch & I think you can stream at 20mbit to Youtube. I could see how it can improve the quality of a low to moderate bitrate stream given the right circumstances.

Musicvid wrote on 5/9/2019, 5:54 PM

Bob, I didn't really ask about vbr. That is a bitrate, not a frame rate setting.

.I asked, "Why do you use variable frame rate rate when constant frame rate (CFR) in OBS is recommended for Vegas?"

Eagle Six wrote on 5/9/2019, 6:12 PM

I don't use OBS, but wonder about this frame rate thing, as I recently read in another forum thread, that OBS has changed or removed the option for CFR and it defaults to VFR.

I have always advised OBS users to take the CFR option, but I have read there is no such thing anymore?!?!

Former user wrote on 5/9/2019, 6:17 PM

I don't use VFR. I was trying to edit a stream encoded by OBS with VFR & . It's likely the norm to use VFR over CFR for streaming. It's the most common type I see.

Musicvid wrote on 5/9/2019, 6:24 PM

Oh, you are using someone else's source. I missed that.

Can't comment there, please post back with your best solution.🙂

wwaag wrote on 5/9/2019, 6:48 PM

I use OBS 21.1 (the latest is 23.1) quite a bit for doing simple recordings that I upload to the forum. I usually just use Nvenc and it records at CFR. For more serious stuff, I record using UtVideo which is always CFR.

Eagle Six wrote on 5/9/2019, 6:55 PM

Thank You @wwaag for the clarification.

Musicvid wrote on 5/9/2019, 6:59 PM

Yes, thanks wwaag. I just now downloaded OBS 23, and the default is indeed, CBR.

Eagle Six wrote on 5/9/2019, 7:10 PM

Yes, thanks wwaag. I just now downloaded OBS 23, and the default is indeed, CBR.

Thank You @Musicvid that pretty much dispels what I was reading from others.

Musicvid wrote on 5/9/2019, 7:15 PM

I think the gamers are using and recommending VFR because it gives them more fps. At least we have a couple of in-house options we didn't have before.

wwaag wrote on 5/9/2019, 7:31 PM

A bit of caution. What you've circled in the photo is CBR--constant bit rate recording--not constant frame rate. I don't see an option to set vfr or cfr in any of the dialogs although I may have missed it. It does permit custom command entries so you can always force it that way since it uses FFmpeg under the hood. Best way--however--just try it and check in MediaInfo.

Musicvid wrote on 5/9/2019, 7:43 PM

Oops, caught by my own mistake.

@NickHope your previously posted settings; do they produce vfr or cfr?

https://www.vegascreativesoftware.info/us/forum/faq-what-obs-studio-settings-work-well-with-vegas-pro--109925/

NickHope wrote on 5/9/2019, 8:25 PM

Oops, caught by my own mistake.

@NickHope your previously posted settings; do they produce vfr or cfr?

https://www.vegascreativesoftware.info/us/forum/faq-what-obs-studio-settings-work-well-with-vegas-pro--109925/

@Musicvid Cfr I think. Unfortunately not near a computer for a couple of days to check.

Chief24 wrote on 5/9/2019, 9:47 PM

A couple of screen shots from OBS off of my machine ("re-furbed" i7-6800K using only MVSPS16). The OBS Settings one is what I used for capturing my installation of Movie Studio, along with using a GoPro Hero 6 Black, the second shot is showing what OBS 23.1.0 shows capable parameters when using "x264" encoding. Also, listed a MediaInfo from one of the aforementioned captures, and how much "variance" in the bit rate with using NVENC encoding, this with an RTX 2070, and being captured to an Intel 660p 2TB PCI-e NVME drive, via adapter card.

General
Complete name                            : S:\OBS Recordings\2019-04-24_22-48-01.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 1.41 GiB
Duration                                 : 23 min 49 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 8 487 kb/s
Writing application                      : Lavf57.84.100

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L5.1
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Format settings, GOP                     : M=2, N=47
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 23 min 49 s
Bit rate mode                            : Variable
Bit rate                                 : 8 479 kb/s
Maximum bit rate                         : 50.0 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.043
Stream size                              : 1.41 GiB (100%)
Color range                              : Full
Matrix coefficients                      : BT.709
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 23 min 49 s
Bit rate mode                            : Variable
Bit rate                                 : 2 276 b/s
Maximum bit rate                         : 192 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 397 KiB (0%)
Title                                    : Track1
Default                                  : Yes
Alternate group                          : 1

john_dennis wrote on 5/9/2019, 11:50 PM

I use UTVideo codec on one machine that has waaaaaaay bigger and faster disks than CPU horsepower.

It's CFR.

I loaded OBS 23.1 and took the default options offered except I changed the file type from .flv to .mp4.

It's CFR.

CFR won't save one from a network hang.