OBS dropps framerate when recording (capture, dual cpu rig)


New Member
Hello! Again have a problem with drop with framerate while recording (or with streaming). I tested the capture card without OBS. It was done with direct ffmpeg running. With direct running I have not found any problems with recording video. Someone held this bug with OBS? Any solution?

Stop answer about network speed or video bitrate, problem not in these case.

.\ffmpeg.exe -hide_banner -rtbufsize 2G -framerate 60 -f dshow -i video="Game Capture 4K60 Pro Video 01":audio="Game Capture 4K60 Pro Audio 01" -b:v 80M -b:a 320K -f flv out.flv -y
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, dshow, from 'video=Game Capture 4K60 Pro Video 01:audio=Game Capture 4K60 Pro Audio 01':
  Duration: N/A, start: 2319.840228, bitrate: 1536 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 60 fps, 60 tbr, 10000k tbn
  Stream #0:1: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> flv1 (flv))
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
[flv @ 000001fc302b7240] removing common factors from framerate
Output #0, flv, to 'out.flv':
    encoder         : Lavf59.34.101
  Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p(tv, progressive), 1920x1080, q=2-31, 80000 kb/s, 60 fps, 1k tbn
      encoder         : Lavc59.52.102 flv
    Side data:
      cpb: bitrate max/min/avg: 0/0/80000000 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 48000 Hz, stereo, s16p, 320 kb/s
      encoder         : Lavc59.52.102 libmp3lame
frame= 2346 fps= 60 q=2.0 Lsize=   94635kB time=00:00:39.23 bitrate=19760.2kbits/s speed=   1x
video:93039kB audio:1534kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.066121%
Exiting normally, received signal 2.

Windows x10 22H2 x64
Capture Elgato 4K pro
8GB RAM, Dual Xeon e5-2670 v3
obs 28.1.2
Last edited:


New Member
Solved, close! Need GPU to test offload..

I though that GPU unused)
Without GPU Xeon can processing only 6M for streaming (I not understand why, writing to file not cause this problems).