360 5.7K Stitching Speed and quality info

Hi All

I am currently running an experiment to see how slow stitching speed is. The results so far aren't good...

My machine:

Intel core i7-7700K @4.2GHz
32GB of memory

I have a 5.7K clip that is just over an hour long. On Ultra stitch quality settings it has taken 16 minutes to do 3%!!!!

Ideally I would try all the different quality settings with a 10 minute clip and create a table of how long it takes on all the different settings but I don't have the time to do that.

Has anyone experimented with these different settings to see what the best quality to time spent pay off is?

I am doing a 3 hour bike ride tomorrow and later in the year will probably record around 8 hours of footage for another bike ride. I don't want to leave my machine rendering this for weeks!

0 Roaders over 6 years ago

OK I decided to do some investigation on this myself. Here are my results.

I recorded a 1 minute clip at 5K resolution I then imported it using various different quality settings. I took the SD card (a high speed one) out of the camera and put it in a USB 3 card reader (which is pretty fast). The video files were being written to a fast SSD raid array. This should mean that we're measuring the processing time, not the read / write time.

times in munutes:seconds

5k import:

low: 1:07, 1:07, 56
medium: 1:13,1:14
high: 2:30, 2:28
max: 6:09, 6:08

4k import:

low: 39,40
medium: 43:40
high: 1:48
max: 4:22

the low and medium settings do not make much impact to processing time - and in fact the CPU wasn't maxed out here so there was probably some other bottleneck governing this processing speed.

For the 5k videos the file sizes were:

low: 453 MB
medium: 444 MB
high: 380 MB
Max: 1,166 MB

(yes that is right, high lower than medium. I did double check this)

0 Roaders over 6 years ago

The videos are here (not very interesting at all)

low: https://youtu.be/8LQtERaQOTI
medium: https://youtu.be/yAleEOPtKiM
high: https://youtu.be/YCUJjW10gDE
max: https://youtu.be/LmJ8Kkpd4O4

I've watched the low and the max videos and I am really not sure that I can see any difference between them...
Is youTube ruining the uploaded video?

0 aramezan over 6 years ago

What was the resulting bitrate of each video? This will throw out if youtube is messing it up or not, which i doubt they are. You also need to wait for Youtube to create the vp9 versions of your video as the avc versions it first creates always look bad.

After looking at the vp9 version of your low and max quality, they do look the same. Based on your filesize, looks like max is double bitrate of low, but still too low. I'm betting it's just a bitrate issue and max needs to be higher.