First tried to upload to incoming but ii’s presented to me as RO Uploaded a 20MB file for someone interested in investigating at: http://we.tl/CpG3aaamaO
On 08 Sep 2015, at 02:10, Andy Furniss <[email protected]> wrote: > Henk D. Schoneveld wrote: >> Hi all, >> >> I’m encoding from several DVB-S sources, satellite, with always the >> same parameters but recordings from some sources CPU-load is about >> 50% of what it could be, others use max. available as attachments >> show. >> >> The 1st inserts a srt file while the 2nd doesn’t but because there’s >> no IO-bottleneck that should be a problem I think. >> >> Any idea what could be the cause of it ? It’s not really problematic, >> just curious. > > May not apply in this case/your CPU but - > > Cpufreq on_demand is sometimes stupid and top doesn't always show the > full picture especially if simd is involved (may depend on h/w) and I > guess if cpufreq on_demand is in use % figures are meaningless without > polling the current frequency anyway (accepting that if they are > 90% > freq should have risen). > > It could be my observations are just because I have an old AMD Phenom - > but I once came across an old ffmpeg-devel post where some one made some > C version of CSC code that beat the SIMD ASM. Shame it was old or I > could have posted - yes I see exactly the same - but that's because > cpufreq on_demand doesn't kick in in the SIMD case - set the CPUs to > perf and the SIMD will beat the C. > > Above just to illustrate that "just looking" with top could mislead - > not saying it does for you, but always when benchmarking/measuring > consider setting CPUs to perf. > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
