extract images

[jingwang97]

Hi,
when i use ffmpeg_video_read to extract the image,i specified a frame rate of 60,but i found the number of frames and the number of corresponding motions are unequal.
while if i don't specify fps,the number are equal.
i use gHO_sBM_c01/02...09_d19_mHO2_ch02 .mp4 and get 481 images,but smpl poses only have 480.so do i need to specify the frame rate?
Thanks！

[liruilong940607]

Thanks for this great catch! I just fixed the small bug in the api.

The problem was from this line:

stream = ffmpeg.filter(stream, 'fps', fps=fps, round='up')

The round='up' argument causes one more frame in the end. I checked the timestamps data stored in the 2D keypoint pkl files and it turns out we were rounding down for the timestamps. So I just fixed this issue by updating the argument to round='down'.

[laubravo]

Hi,
I'm using the ffmpeg_video_to_images on the val set and for some videos (ex:gWA_sFM_c01_d26_mWA3_ch11) I get the correct number of frames when using round='down' and for others (ex: gBR_sBM_cAll_d05_mBR0_ch08) I need to use round='up'.
Do you know what is happening?

[liruilong940607]

Hi thanks for reporting. I'm currently in a travel so will check it in a few days.