On Saturday, 15 September 2018 2:16:19 ACST Panagiotis Malakoudis wrote: > I did more tests and there is a consistent difference in VRAM usage when > running same commands in GTX 1050 Ti and GTX 1070 Ti. > NVENC encoding also excibits same behaviour, for example: > ffmpeg -f mpegts -i https://samples.ffmpeg.org/V-codecs/h264/HD-h264.ts > -vcodec h264_nvenc -c:a copy -f mpegts transcoded.ts > all defaults, allocates 94MB in 1050 Ti but 163MB in 1070 Ti, for a > difference of 69MB. > Combining encoding AND decoding in one command, for example: > ffmpeg -hwaccel cuvid -c:v h264_cuvid -f mpegts -i > https://samples.ffmpeg.org/V-codecs/h264/HD-h264.ts -vcodec h264_nvenc -c:a > copy -f mpegts transcoded.ts > 1070 Ti: 269MB, 1050 Ti: 200MB. > So we see a difference of 66MB when only decoding, 69MB when only encoding, > 69MB when both decoding+encoding. > I also tested two different driver versions, 384.130 and 390.77, both give > same results. > What is interesting is that testing in Windows gives different, lower VRAM > values for GTX 1070 Ti but still more than GTX 1050 Ti in Linux (I couldn't > test GTX 1050 Ti in Windows yet). For example, decoding uses 132MB when > same command in Linux uses 153MB. > > I don't think it is a bug in ffmpeg, probably something going on in nvidia > drivers. Where I could report this to nvidia? > [...]
Is this possibly related to the differing architecture (number of Cuda cores and/or the Framebuffer size) on the different cards? 768 with 4Mb FB on the GTX 1050 Ti , 2432 with 8MB FB on the 1070 Ti. I would expect the driver to need to allocate more resources to the latter... -- ============================================================== Rodney Baker VK5ZTV [email protected] CCNA #CSCO12880208 ============================================================== _______________________________________________ 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".
