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• Monster Battery Power Revisited

  28 mai 2010, par Multimedia Mike — Python, Science Projects

  So I have this new fat netbook battery and I performed an experiment to determine how long it really lasts. In my last post on the matter, it was suggested that I should rely on the information that gnome-power-manager is giving me. However, I have rarely seen GPM report more than about 2 hours of charge ; even on a full battery, it only reports 3h25m when I profiled it as lasting over 5 hours in my typical use. So I started digging to understand how GPM gets its numbers and determine if, perhaps, it’s not getting accurate data from the system.

  I started poking around /proc for the data I wanted. You can learn a lot in /proc as long as you know the right question to ask. I had to remember what the power subsystem is called — ACPI — and this led me to /proc/acpi/battery/BAT0/state which has data such as :

  present :                 yes
  capacity state :          ok
  charging state :          charged
  present rate :            unknown
  remaining capacity :      100 mAh
  present voltage :         8326 mV
  

  "Remaining capacity" rated in mAh is a little odd ; I would later determine that this should actually be expressed as a percentage (i.e., 100% charge at the time of this reading). Examining the GPM source code, it seems to determine as a function of the current CPU load (queried via /proc/stat) and the battery state queried via a facility called devicekit. I couldn’t immediately find any source code to the latter but I was able to install a utility called ’devkit-power’. Mostly, it appears to rehash data already found in the above /proc file.

  Curiously, the file /proc/acpi/battery/BAT0/info, which displays essential information about the battery, reports the design capacity of my battery as only 4400 mAh which is true for the original battery ; the new monster battery is supposed to be 10400 mAh. I can imagine that all of these data points could be conspiring to under-report my remaining battery life.

  Science project : Repeat the previous power-related science project but also parse and track the remaining capacity and present voltage fields from the battery state proc file.

  Let’s skip straight to the results (which are consistent with my last set of results in terms of longevity) :

  
  
  

  So there is definitely something strange going on with the reporting— the 4400 mAh battery reports discharge at a linear rate while the 10400 mAh battery reports precipitous dropoff after 60%.

  Another curious item is that my script broke at first when there was 20% power remaining which, as you can imagine, is a really annoying time to discover such a bug. At that point, the "time to empty" reported by devkit-power jumped from 0 seconds to 20 hours (the first state change observed for that field).

  Here’s my script, this time elevated from Bash script to Python. It requires xdotool and devkit-power to be installed (both should be available in the package manager for a distro).
  

  PLAIN TEXT

  PYTHON :

  1. # !/usr/bin/python
  2.  
  3. import commands
  4. import random
  5. import sys
  6. import time
  7.  
  8. XDOTOOL = "/usr/bin/xdotool"
  9. BATTERY_STATE = "/proc/acpi/battery/BAT0/state"
  10. DEVKIT_POWER = "/usr/bin/devkit-power -i /org/freedesktop/DeviceKit/Power/devices/battery_BAT0"
  11.  
  12. print "count, unixtime, proc_remaining_capacity, proc_present_voltage, devkit_percentage, devkit_voltage"
  13.  
  14. count = 0
  15. while 1 :
  16.   commands.getstatusoutput("%s mousemove %d %d" % (XDOTOOL, random.randrange(0,800), random.randrange(0, 480)))
  17.   battery_state = open(BATTERY_STATE).read().splitlines()
  18.   for line in battery_state :
  19.     if line.startswith("remaining capacity :") :
  20.       proc_remaining_capacity = int(line.lstrip("remaining capacity : ").rstrip("mAh"))
  21.     elif line.startswith("present voltage :") :
  22.       proc_present_voltage = int(line.lstrip("present voltage : ").rstrip("mV"))
  23.   devkit_state = commands.getoutput(DEVKIT_POWER).splitlines()
  24.   for line in devkit_state :
  25.     line = line.strip()
  26.     if line.startswith("percentage :") :
  27.       devkit_percentage = int(line.lstrip("percentage :").rstrip(’\%’))
  28.     elif line.startswith("voltage :") :
  29.       devkit_voltage = float(line.lstrip("voltage :").rstrip(’V’)) * 1000
  30.   print "%d, %d, %d, %d, %d, %d" % (count, time.time(), proc_remaining_capacity, proc_present_voltage, devkit_percentage, devkit_voltage)
  31.   sys.stdout.flush()
  32.   time.sleep(60)
  33.   count += 1

• FileNotFoundError : [WinError 2] The system cannot find the file specified when using moviepy

  17 mars 2023, par HamidBee

  I am trying to reduce the file size of a .mp4 file using the following code :

  


  import os
import moviepy.editor as mp
import ffmpeg

def compress_video(input_file, output_file, target_size_ratio=0.5):
    if not os.path.exists(input_file):
        raise FileNotFoundError(f"Input file not found: {input_file}")

    if target_size_ratio <= 0 or target_size_ratio >= 1:
        raise ValueError("Target size ratio must be between 0 and 1")

    # Get input video information
    probe = ffmpeg.probe(input_file)
    video_stream = next((stream for stream in probe['streams'] if stream['codec_type'] == 'video'), None)
    bitrate = int(video_stream['bit_rate'])

    # Calculate new bitrate to achieve the target file size
    new_bitrate = int(bitrate * target_size_ratio)

    # Load the video and compress
    input_video = mp.VideoFileClip(input_file)
    input_video.write_videofile(
        output_file,
        bitrate=f"{new_bitrate}k",
        codec="libx264",
        audio_codec="aac",
        threads=4,
        ffmpeg_params=["-strict", "-2"]
    )

input_file = r"C:\Users\Hamid\Downloads\A.mp4"
output_file = r"C:\Users\Hamid\Downloads\B.mp4"
compress_video(input_file, output_file, target_size_ratio=0.5)


  


  But I am getting the following error :

  


  FileNotFoundError: [WinError 2] The system cannot find the file specified


  


  Just a note I have a file in that directory called A.mp4 but currently no file exists called B.mp4.

  


• Youtube-dll how to get a direct download link to the merged file without creating a temp file on server

  11 juillet 2019, par CeylonDomains Solutions

  Is there any way to create a direct download link to the merged file without creating a temp file on the server in youtube-dll ?

  youtube-dll -f 255+160 https://youtu.be/p-flvm1szbI 

  The above code will merge the file and output the merged file.

  I want to allow users to directly download the merged file to their computers — without creating any temp file on my server. Is this possible ?

  (Creating a temp file and then letting the user download it is already possible.)