sendPhoto doesn't send image encoded anymore

[andreasalvi]

Hello,
I've this code. frame is a Mat variable of opencv that contains an image

img_str = cv2.imencode('.jpg', frame)[1].tostring()
bot.sendPhoto(chat_id,['image.jpg', img_str])

I used this code some months ago and all worked fine but now don't.

[fedebecat]

We managed overcome this issue by using

import StringIO
bot.sendPhoto(chat_id,('image.jpg', StringIO.StingIO(img_str)))

[thalesmaoa]

Its not working here. I have a frame, mat numpy, and just want to send with telepot.

In [10]: cap_ch11 = cv2.VideoCapture(ch11_url)                                  

In [11]: ret, frame = cap_ch11.read()                                           

In [12]: img_str = cv2.imencode('.jpg', frame)[1].tostring()                    

In [13]: bot.sendPhoto(chat_id,('image.jpg', StringIO.StringIO(img_str)))       
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-13-44c7306ef45c> in <module>
----> 1 bot.sendPhoto(chat_id,('image.jpg', StringIO.StringIO(img_str)))

NameError: name 'bot' is not defined

In [14]: import io                                                              

In [15]: bot.sendPhoto(chat_id,('image.jpg', io.StringIO(img_str))) 
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-21-010b054911d2> in <module>
----> 1 bot.sendPhoto(chat_id,('image.jpg', io.StringIO(img_str)))

TypeError: initial_value must be str or None, not bytes