Laggy playback and handling of AVC video

[Guest]

Got a video file recorded using OBS and Blackmagic Decklink 4K card. It was encoded using GPU and ended up in format like this:

Video

ID                          : 1

Format                      : AVC

Format/Info                 : Advanced Video Codec

Format profile              : Main@L4.2

Format settings             : CABAC / 2 Ref Frames

Format settings, CABAC      : Yes

Format settings, ReFrames   : 2 frames

Codec ID                    : avc1

Codec ID/Info               : Advanced Video Coding

Duration                    : 46 min 50 s

Bit rate mode               : Constant

Bit rate                    : 35.0 Mb/s

Width                       : 1 920 pixels

Height                      : 1 080 pixels

Display aspect ratio        : 16:9

Frame rate mode             : Constant

Frame rate                  : 60.000 FPS

Color space                 : YUV

Chroma subsampling          : 4:2:0

Bit depth                   : 8 bits

Scan type                   : Progressive

Bits/(Pixel*Frame)          : 0.281

Stream size                 : 11.2 GiB (100%)

Color range                 : Limited

Matrix coefficients         : BT.470 System B/G

I have an 8 core xeon and 1080ti gpu, but program lagged hardly when I tried to edit something. Playback lagged too, cpu load was near 80%. What's wrong? Should I update some codecs or settings? CUDA rendering works fine, I checked.

[Kevin-Monahan]

Hi AnnaV,

What happens if you transcode or create proxies for the footage?

Thanks,
Kevin

[Guest · Accepted solution]

It transcodes everyting ok, but with high cpu usage.

[Jim_Simon]

It may be more convenient, but...if it's not working...

[Kevin-Monahan]

It transcodes everyting ok, but with high cpu usage.

Higher CPU usage for higher bandwidth clips is normal. Continue to transcode then.

Thanks,
Kevin

[Jim_Simon]

If you have a DeckLink, why would you choose OBS instead?

[Guest]

I stream, it's more convenient for me to record video in OBS.