[Octave-bug-tracker] [bug #58451] [octave forge] (video) Unit test VideoWriter fails on ppc64el

[Andreas Weber]

Follow-up Comment #1, bug #58451 (project octave):

Hi Rafael,
sorry for not answering earlier (and thank you Kai pointing me to this).

The rainbow-ppc64le.mp4 really looks bad with heavy compression artifacts.
When I compare those two videos I see


2c2
< Complete name                            : rainbow-x86_64.mp4
---
> Complete name                            : rainbow-ppc64le.mp4
6c6
< File size                                : 11.8 KiB
---
> File size                                : 43.7 KiB
8c8
< Overall bit rate                         : 24.3 kb/s
---
> Overall bit rate                         : 89.6 kb/s
22c22
< Bit rate                                 : 21.6 kb/s
---
> Bit rate                                 : 86.9 kb/s
32,34c32,34
< Bits/(Pixel*Frame)                       : 0.024
< Stream size                              : 10.6 KiB (89%)
< Writing library                          : x264 core 159
---
> Bits/(Pixel*Frame)                       : 0.097
> Stream size                              : 42.5 KiB (97%)
> Writing library                          : x264 core 155 r2917 0a84d98


so the ppc64le video is bigger, has a higher bit rate but lower quality.
Perhaps the older x264 lib

"x264 core 159" on x86 and "x264 core 155 r2917 0a84d98" on PPC64 is the
reason?

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