Posts by csaba

    Hi,


    I have tested more VC-1 movies on my PI 4, and I think that if one cpu core is powerful enough to decode the movie (decoder cpu core utilization < 95%), then the playback is smooth (no frame drop), and if one the decoder core utilization is higher than 95% VC-1 playback stutters, there are frame drops.


    Csaba

    Hi,


    I have stuttering problem with some VC-1 full HD movies on PI 4 (1080p 23.976 fps 22.2 Mbps TrueHD 5.1). Player debug info reports several dropped frames, and one cpu core has 98-100% load. It can be reproduced with the VC-1 sample file on KODI Samples page: VC-1 1080i/29.970 (MKV w/DTS-HD MA 5.1 audio). Interestingly the other sample VC-1 file plays smoothly.


    9.1.002 ALPHA is installed on PI 4, 'Adjust display refresh rate' is set to Always, there is no thermal throttling (arm_freq is 1500).


    I understand, that PI 4 has no HW decode, so I can't by a licence. It seems to me, that the software decode uses only one core, and maybe it's too much work for it.


    Does anybody has the same experience?


    Csaba