Reading form stdout pip will not make sanjuuni process more frames

[Commandcracker]

import subprocess

p = subprocess.Popen([
    "./sanjuuni",
    "-i", "/home/red/Desktop/in.mp4",
    "--raw",
    "--streamed",
    "--width=51",
    "--height=19",
    "-o", "-"
], stdout=subprocess.PIPE)

while True:
    print(p.stdout.read(1).decode(), end="")

$ python3 test.py
|----------------.------------------------------------------------------------|
| Device ID    0 | NVIDIA GeForce RTX 3070                                    |
|----------------'------------------------------------------------------------|
|----------------.------------------------------------------------------------|
| Device ID      | 0                                                          |
| Device Name    | NVIDIA GeForce RTX 3070                                    |
| Device Vendor  | NVIDIA Corporation                                         |
| Device Driver  | 555.42.02                                                  |
| OpenCL Version | OpenCL C 1.2                                               |
| Compute Units  | 46 at 1755 MHz (5888 cores, 20.666880 TFLOPs/s)            |
| Memory, Cache  | 8083 MB, 1288 KB global / 48 KB local                      |
| Buffer Limits  | 2020 MB global, 64 KB constant                             |
|----------------'------------------------------------------------------------|
32Vid 1.1
0
!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bde8c92f

[Commandcracker]

I guess its because sanjuuni is not using an muxer
https://ffmpeg.org/ffmpeg.html#Detailed-description
https://ffmpeg.org/ffmpeg-formats.html#Muxers

 _______              ______________
|       |            |              |
| input |  demuxer   | encoded data |   decoder
| file  | ---------> | packets      | -----+
|_______|            |______________|      |
                                           v
                                       _________
                                      |         |
                                      | decoded |
                                      | frames  |
                                      |_________|
 ________             ______________       |
|        |           |              |      |
| output | <-------- | encoded data | <----+
| file   |   muxer   | packets      |   encoder
|________|           |______________|