Hi Dan, Thanks for report this. Could you file an issue at http://trac.ffmpeg.org/query?status=new&status=open&status=reopened&col=id&col=summary&col=status&col=type&col=component&col=version&col=time&col=changetime&order=priority&report=1.
So we can tracking it? thanks > -----Original Message----- > From: ffmpeg-user <[email protected]> On Behalf Of dan > Sent: Saturday, January 2, 2021 8:12 AM > To: FFmpeg user questions <[email protected]> > Subject: [FFmpeg-user] ffmpeg qsv performance well below expected > > In running ubuntu with an i3-10100 > > I'm able to transcode 2 MPEG2 to h.265 using the following command ffmpeg - > hwaccel qsv -i http://hdhomerun:5004/auto/v2.2.ts -c:v hevc_qsv -c:a copy - > profile:v main -global_quality 30 -g 48 -keyint_min 48 -sc_threshold 0 > -hls_time > 2 -hls_list_size 10 -hls_segment_type mpegts -hls_flags delete_segments - > hls_segment_filename video_%03d.ts video.m3u8 > > but, the third video causes all 3 to start to throw errors in encoding. CPU > usage > on this quad core CPU is about 35% on 3 different cores, seems there's no > issue > with CPU (general purpose) performance. > Am I hitting a wall on hevc_qsv here? > > I've switched -hwaccel to vaapi which works but performance is a bit worse. > I've removed this to push the MPEG2 decode to software, no real effect. > > I've tried to start the 3rd encode with libx265 but that crushes the CPU. > > h264_qsv is able to handle this. > > It appears, at least on the surface, that this CPU w/ 28 video cores can only > handle 2 h.265 encodes in quicksync but the specs seem to suggest it should do > more. > > Am I missing something obvious? > > note, the first 2 streams are 1080i MPEG2 from an HDHomeRun. The third > stream I selected a 720p MPEG2 stream and even that doesn't work well. Also, > I > am not using any deinterlacer, I removed them to try to get the third stream > running. > > Thanks for any feedback. > _______________________________________________ > 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". _______________________________________________ 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".
