Apologies for the late response, I was undergoing some major hardware changes in my setup and am now back to trying to figure this out.
> There is no multi-threaded audio encoding. Yeah, I guess I understand why that makes sense programmatically, but my issue isn't really that my audio is being encoded on a per-stream basis by 1 thread, right? It's that all audio streams in my command, even if they have different destinations, are being funneled through 1 thread. I'd assume the limitation around single thread encoding would exist on a per-stream basis, but I'm obviously not well versed in the programming behind that, just trying to understand what's going on. > Is the issue you see only reproducible with dshow input or also with > testsrc2 > input? > I suspect there will always be a bottleneck in a load situation like above > but it may be interesting to narrow it down. > Went ahead and tested this and you appear to be right, using this command I get 100% utilization on 1 thread grinding the real-time encoding to a halt: ffmpeg -y -f lavfi -re -i testsrc2=size=3840x2160:rate=60 ` -map 0 -c:v h264_nvenc -preset: hp -rc-lookahead 120 -pix_fmt nv12 C:\Users\gabri\Videostestsrc1.ts ` -map 0 -c:v h264_nvenc -preset: hp -rc-lookahead 120 -pix_fmt nv12 C:\Users\gabri\Videostestsrc2.ts ` -map 0 -c:v h264_nvenc -preset: hp -rc-lookahead 120 -pix_fmt nv12 C:\Users\gabri\Videostestsrc3.ts ` -map 0 -c:v h264_nvenc -preset: hp -rc-lookahead 120 -pix_fmt nv12 C:\Users\gabri\Videostestsrc4.ts Ultimately, I do understand why each output stream individually would need to be handled by 1 thread, but I guess I don't understand why all output streams in a single command would need to be handled by 1 thread. It seems like I can accomplish the same goal with a somewhat acceptable variance in sync between each output file when using different FFmpeg instances for each output file, but it definitely doesn't have the same consistency that a single command does. _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
