Hi Javier, On Mon, Mar 12, 2018 at 1:54 PM, Javier Martin <javiermartin@xxxxxxxxx> wrote: > Hi, > we have an i.MX6 Solo based board running the latest mainline kernel > (4.15.3). > > As part of our development we were measuring the decoding performance of the > i.MX6 coda chip. > > For that purpose we are feeding the decoder with 640x368 @ 30fps H.264 > streams that have been generated by another i.MX6 coda encoder configured > with fixed qp = 25 and gopsize = 16. > > For 1-2 streams it works smoothly. However, when adding the 3rd stream the > first decoder instance starts to output these kind of errors: > > DEC_PIC_SUCCESS = 2097153 -> 0x200001 > DEC_PIC_SUCCESS = 2621441 -> 0x280001 > > Every time one of these errors appears we can observe a weird artifact in > the decoded video (pixelated macroblocks and/or jumps back in time). > > I tried looking at the original VPU lib implementation by Freescale [1] but > they don't seem to handle these errors either. As I don't have access to any > kind of Coda IP documentation it's quite hard to me to perform any > additional debugging. > > Has anyone experienced these kind of performance issues too? I'm open to any > suggestions and willing to perform extra tests to get to the bottom of this. Are you passing 'capture-io-mode=dmabuf' in your Gstreamer pipeline? This really improves the performance of video decoding.
