Is it possible to disable hwaccel decode explicitly in an FFmpeg instance? Say, -hwaccel none such that no hardware-accelerated decoder instance is initialized on launch?
On Fri, 24 Aug 2018 at 01:14, Yang Zhang <[email protected]> wrote: > Yes, 25 hd1080p channels use -hwaccel cuvid options to do full hardware > acceleration transcoding. other channels use the GPU encoding only. this > should can let you transcoding more channels. and fix the stutter problem. > > You can use "nvidia-smi dmon" to check the usage of NVDEC/ENC chips. > > On Fri, Aug 24, 2018 at 6:02 AM Dennis Mungai <[email protected]> wrote: > > > So, to clarify: > > > > If you were to disable hwaccel decode (and rely solely on software-based > > decoding) BUT utilize NVENC on a system with a beefy processor and > adequate > > RAM, you should be able to eliminate the bottleneck, correct? > > > > Because what you're implying (by the bottleneck at decode side) would be > a > > limitation in how FFmpeg handles filter performance (hwupload, to be > > exact), an issue that can be circumvented by eliminating hwaccel in > decode. > > > > > > > > On Fri, 24 Aug 2018 at 00:57, Yang Zhang <[email protected]> wrote: > > > > > The problem is even you using the Tesla P100, and you can see it has 3 > > > NVENC chips inside it. but it has only 1 NVDEC chip, this is very very > > > important. the bottleneck is at decoding side. this is why you got > > freezing > > > or stutter problem. basically, perhaps you can use Tesla P100 encoding > 75 > > > hd1080p channels, but you can not decoding more than 25 hd1080p > channels > > on > > > it. > > > > > > On Fri, Aug 24, 2018 at 5:51 AM Dennis Mungai <[email protected]> > wrote: > > > > > > > No. > > > > > > > > This is as tested on the Tesla P100. > > > > > > > > On Fri, 24 Aug 2018 at 00:26, Pedro Daniel Costa < > > > > [email protected]> > > > > wrote: > > > > > > > > > Ok > > > > > > > > > > But with the TESLA models, did you have any issues over 40 streams? > > > > > > > > > > I am planning on budge project to run minimum 100channels > > > > > > > > > > -----Mensagem original----- > > > > > De: ffmpeg-user [mailto:[email protected]] Em nome de > > > > Dennis > > > > > Mungai > > > > > Enviada em: quinta-feira, 23 de agosto de 2018 13:54 > > > > > Para: FFmpeg user questions > > > > > Assunto: [FFmpeg-user] A question on the Quadro P6000 and maximum > > > > > simultaneous NVENC encodes in FFmpeg > > > > > > > > > > Hello there, > > > > > > > > > > For users with this specific card (and FFmpeg installed), kindly > > > clarify > > > > > on the following: > > > > > > > > > > (a). How many simultaneous encoder sessions can you run on this > card? > > > > > > > > > > (b). Have you ran into any issues, such as stuttering and dropping > > > > streams > > > > > with multiple concurrent encodes? > > > > > > > > > > I ask because of a recent case where adding more than ~40 > concurrent > > > > > encodes would make the output "drop" and stutter massively, as if > > > FFmpeg > > > > > itself was hanging, despite the GPU having more than enough VRAM > > > (24GB?) > > > > > and resources (under ~11% utilization according to nvidia-smi), > > > implying > > > > > some sort of artificial limitation in effect despite the GPU > support > > > > matrix > > > > > specifying otherwise: > > > > > > https://developer.nvidia.com/video-encode-decode-gpu-support-matrix > > > > > > > > > > Your feedback on this is appreciated. > > > > > _______________________________________________ > > > > > ffmpeg-user mailing list > > > > > [email protected] > > > > > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > > > > > > > To unsubscribe, visit link above, or email > > > > [email protected] > > > > > with subject "unsubscribe". > > > > > _______________________________________________ > > > > > ffmpeg-user mailing list > > > > > [email protected] > > > > > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > > > > > > > To unsubscribe, visit link above, or email > > > > > [email protected] with subject "unsubscribe". > > > > _______________________________________________ > > > > ffmpeg-user mailing list > > > > [email protected] > > > > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > > > > > To unsubscribe, visit link above, or email > > > > [email protected] with subject "unsubscribe". > > > _______________________________________________ > > > ffmpeg-user mailing list > > > [email protected] > > > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > > > To unsubscribe, visit link above, or email > > > [email protected] with subject "unsubscribe". > > _______________________________________________ > > ffmpeg-user mailing list > > [email protected] > > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > To unsubscribe, visit link above, or email > > [email protected] with subject "unsubscribe". > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
