json.decoder error (Mediapipe)

[Vinayky86]

Hello.. thanks for this amazing development..
I was trying to use mediapipe for MV1P and i followed these steps
1 - python apps/preprocess/extract_image.py 0_input\project
2 - python apps/preprocess/extract_keypoints.py 0_input\project --mode mp-pose
and
3 - python apps/demo/mv1p.py 0_input/project --out 1_output/project --vis_det --vis_repro --sub_vis 1 2 3 4 --vis_smpl

but when i run 3rd steps (mv1p.py), getting this error

Traceback (most recent call last):
File "apps/demo/mv1p.py", line 117, in
mv1pmf_skel(dataset, check_repro=True, args=args)
File "apps/demo/mv1p.py", line 35, in mv1pmf_skel
images, annots = dataset[nf]
File "c:\mocap\easymocap\easymocap\dataset\mv1pmf.py", line 72, in getitem
images, annots_all = super().getitem(index)
File "c:\mocap\easymocap\easymocap\dataset\base.py", line 482, in getitem
annot = read_annot(annname, self.kpts_type)
File "c:\mocap\easymocap\easymocap\mytools\file_utils.py", line 46, in read_annot
data = read_json(annotname)
File "c:\mocap\easymocap\easymocap\mytools\file_utils.py", line 19, in read_json
data = json.load(f)
File "C:\Users\Vinayky86\anaconda3\envs\easymocap\lib\json_init_.py", line 296, in load
parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
File "C:\Users\Vinayky86\anaconda3\envs\easymocap\lib\json_init_.py", line 348, in loads
return _default_decoder.decode(s)
File "C:\Users\Vinayky86\anaconda3\envs\easymocap\lib\json\decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "C:\Users\Vinayky86\anaconda3\envs\easymocap\lib\json\decoder.py", line 353, in raw_decode
obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Invalid \escape: line 2 column 19 (char 20)

Please correct me if I am doing any wrong steps
thank you ...!!!

[chingswy]

Hello, you can print the filename when the error occurs.

[Vinayky86]

thanks for your response..!!
am i following the right steps..?
1 - python apps/preprocess/extract_image.py
2 - python apps/preprocess/extract_keypoints.py
3 - python apps/demo/mv1p.py

"Actully i don't know lot of things about coading,
can you please direct me what is the main reason of this error"
thanks a lot..!!

[chingswy]

Seems the file is corrupted. You can remove the annots folder and generate again.

[Vinayky86]

thanks...
i did this step around 4 times delete and regenerate the annots. but nothing happened.
but i found little difference in mediapipe's annots
in openpose annots - "filename": "images\1\000000.jpg",
in mediapipe annots - "filename": "1\000000.jpg",
can it cause the Json.decoder error..?

[chingswy]

No. This won't cause the decode error.

[Vinayky86]

Ok thanks for your reply..!!! I will try

[NishilVani]

The Problem is in the JSON files there should be two \ in the filename but there is only one

run this command for each camera

import os

os.chdir(r'path\to\json\folder')

for fp in os.listdir('.'):
    if fp.endswith('.json'):
        f = open(fp, 'r+')
        content = f.read()
        f.seek(0)
        f.truncate()

        f.write(content[:26] + r"\\" + content[27:])
        f.close()

[chingswy]

Thanks @NishilVani . Maybe it's a bug in windows? I didn't test the code on Windows now.

[Vinayky86]

Thank you very much @NishilVani your code successfully convert .json file for each cameras, but easymocap giving same jsondecoder error. BTW thanks again for your help you are very kind, really appreciate 🙏🙏

[ferhatsb]

Probably related to #198

[Vinayky86]

Thank you very much @ferhatsb exactly..👌you have solved the problem..👏👏❤️