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• How to install MPD filter "ffmpeg" into MPD running on RaspberryPi [closed]

  13 mai, par Weston Mitchell

  I’m using Moode audio player OS on a Raspberry Pi 5 to play audio through two USB devices : headphones (card 3 : Device_1) for the full spectrum and a subwoofer (card 0 : Device) for low frequencies (20–100Hz) in a meditation lounge setup. The audio source is a NAS on a Mac. My goal is simultaneous playback : headphones in stereo, subwoofer in mono with low-pass filtering. I have configured the mpd.conf file to setup audio ouputs for both devices. Now I need to apply a lowpass filter to the subwoofer device. I tried using MDP's "ffmpeg" as a lowpass filter, but the logs say :

  


  


  Failed to initialize filter chain for "Subwoofer" : No such filter plugin : ffmpeg

  


  


  So I checked MPD's list of filters using mpd --version and it shows only one filter :

  


  


  Decoder plugins :
  
[mpg123] mp3
  
[mad] mp3 mp2
  
[vorbis] ogg oga
  
[oggflac] ogg oga
  
[flac] flac
  
[opus] opus ogg oga
  
[dsdiff] dff
  
[dsf] dsf
  
[faad] aac
  
[wavpack] wv
  
[adplug] amd d00 hsc laa rad raw sa2
  
[ffmpeg] 264 265 ...

  


  Filters :
  
soxr

  


  Tag plugins :
  
id3tag

  


  ...

  


  


  So it's listed as a Decoder, but not a as a filter. MPD docs says it can be used as a filter : MPD Docs - Filters

  


  So how do I add the ffmpeg to the list of filters ?

  


• Button "Clean FFMeta" does nothing after compiling with PyInstaller

  6 mai, par Leonie Holdermann

  I’m working on my first Python project and I’ve compiled it into an executable using PyInstaller with the following command :

  


  pyinstaller --onefile --noconsole app.py


  


  However, when I run the executable, the button "Clean FFMeta" which triggers the clean_ffmeta() function does nothing. Additionally, changing the language or the chapter settings under the "Options -> Chapter settings" menu doesn’t seem to affect anything either. It all works perfectly in the Python script before compilation, but once compiled into an .exe, none of these functions respond.

  


  I've reviewed the code, and the button is correctly linked to the function, but I suspect something might be going wrong during the compilation process.

  


  What I have tried :

  


  

  • Checked that all dependencies are included.

  


  • Verified that the configuration and language changes are being correctly applied before compilation.

  


  • Tried running the executable from a console to check for error messages, but there are none visible (since I used —noconsole).

  


  


  What I expect :

  


  

  • The "Clean FFMeta" button should clean the FFMeta file based on the
user settings.

  


  • Language and chapter settings should be updated and reflected in the GUI immediately.

  


  


  Code :
Below is a simplified version of my code, especially the sections related to the "Clean FFMeta" functionality and language/chapter settings.

  


  def clean_ffmeta():
if not config.get("cd_in_path"):
    show_error(texts[current_language]["error"] + " No CD_IN path configured.")
    return

chapter_path = os.path.join(config["cd_in_path"], "chapters.ffmeta")
cleaned_chapter_path = os.path.join(config["cd_in_path"], "chapters_cleaned.ffmeta")

if not os.path.exists(chapter_path):
    show_error(texts[current_language]["no_chapters_file"])
    return

write_to_console("Starting to clean FFMeta...")
thread = threading.Thread(target=clean_ffmeta_thread, args=(chapter_path, cleaned_chapter_path))
thread.start()

def clean_ffmeta_thread(chapter_path, cleaned_chapter_path):
    try:
        chapter_action = config.get("chapter_action", "clean")
        keep_empty = config.get("chapter_keep_empty", False)

        write_to_console(f"Chapter action: {chapter_action}, Keep empty: {keep_empty}")

        with open(chapter_path, "r", encoding="utf-8") as f:
            lines = f.readlines()

        new_lines = []
        chapter_counter = 0

        for line in lines:
            stripped_line = line.strip()
            if stripped_line.startswith("title="):
                title_content = stripped_line[6:]
                
                if chapter_action == "clean":
                    if title_content == "":
                        if keep_empty:
                            new_lines.append(line)
                        else:
                            write_to_console("Empty title skipped.")
                            continue
                    else:
                        new_lines.append(line)
                
                elif chapter_action == "number":
                    chapter_counter += 1
                    chapter_title = f"{texts[current_language]['chapter']} {chapter_counter}"
                    new_lines.append(f"title={chapter_title}\n")
                    write_to_console(f"Renamed to: {chapter_title}")
            else:
                new_lines.append(line)

        with open(cleaned_chapter_path, "w", encoding="utf-8") as f:
            f.writelines(new_lines)

        write_to_console(f"FFMeta cleaned and saved as '{cleaned_chapter_path}'.")

    except Exception as e:
        write_to_console(f"Error cleaning FFMeta: {str(e)}")

def open_chapter_settings():
    global chapter_settings_window, chapter_action_var
    global chapter_keep_empty_checkbox, chapter_save_button

    chapter_settings_window = tk.Toplevel(root)
    chapter_settings_window.title(texts[current_language]["chapter_setting_title"])
    chapter_settings_window.geometry("300x250")
    chapter_settings_window.resizable(False, False)
    
    chapter_action_var = tk.StringVar(value=config.get("chapter_action", "clean"))
    chapter_keep_empty_var = tk.BooleanVar(value=config.get("chapter_keep_empty", False))
    
    tk.Label(
        chapter_settings_window,
        text=texts[current_language]["chapter_setting_choose_option"]
    ).pack(pady=(10, 5))
    
    tk.Radiobutton(
        chapter_settings_window,
        text=texts[current_language]["chapter_setting_clean"],
        variable=chapter_action_var,
        value="clean"
    ).pack(pady=5)

    tk.Radiobutton(
        chapter_settings_window,
        text=texts[current_language]["chapter_setting_number"],
        variable=chapter_action_var,
        value="number"
    ).pack(pady=5)

    chapter_keep_empty_checkbox = tk.Checkbutton(
        chapter_settings_window,
        text=texts[current_language]["chapter_setting_keep_empty"],
        variable=chapter_keep_empty_var
    )
    chapter_keep_empty_checkbox.pack(pady=5)

    chapter_save_button = tk.Button(
        chapter_settings_window,
        text=texts[current_language]["chapter_setting_save"],
        command=lambda: save_chapter_settings(chapter_keep_empty_var, chapter_settings_window)
    )
    chapter_save_button.pack(pady=10)

def save_chapter_settings(keep_empty_var, window):
    config["chapter_action"] = chapter_action_var.get()
    config["chapter_keep_empty"] = keep_empty_var.get()
    save_config()
    write_to_console(f"Chapter settings saved: Action={config['chapter_action']}, Keep empty={config['chapter_keep_empty']}")
    window.destroy()

options_menu = tk.Menu(menu, tearoff=0)
options_menu.add_command(label="Check pip-ffmpeg", command=check_pip_ffmpeg)
options_menu.add_command(label=texts[current_language]["menu_chapter_settings"], command=open_chapter_settings)
menu.add_cascade(label="Options", menu=options_menu)

btn3 = tk.Button(btn_frame, text="3. Clean FFMeta", command=clean_ffmeta)
btn3.grid(row=0, column=2, padx=5)


  


  Here you find the entire project code of the entire project : https://www.pythonmorsels.com/p/32hkh/

  


  Why is the clean_chapters function not working ?

  


• ffmpeg throws error "Invalid file index 1 in filtergraph description" when used with concat and -/filter_complex [closed]

  20 février, par Ernst V

  I want to create mp4 videos from many small .jpg files (time-lapse). Each image is shown for 2 seconds and then fades to the next. This works fine when I issue the command with a few images (see below). But when the number of images reaches hundreds or thousands, I can no longer put them into a single command, but have to put the filenames and the complex filter into .txt files.

  


  Whatever I try, I always get the error "Invalid file index 1 in filtergraph description".

  


  This works fine :

  


  ffmpeg -loop 1 -i "image1.jpg" -loop 1 -i "image2.jpg" -loop 1 -i "image3.jpg" -loop 1 -i "image4.jpg" -loop 1 -i "image5.jpg" -filter_complex "[0:v]trim=0:2,setpts=PTS-STARTPTS[v0]; [1:v]trim=0:2,setpts=PTS-STARTPTS[v1]; [2:v]trim=0:2,setpts=PTS-STARTPTS[v2]; [3:v]trim=0:2,setpts=PTS-STARTPTS[v3]; [4:v]trim=0:2,setpts=PTS-STARTPTS[v4]; [v0][v1] xfade=transition=fade:duration=1:offset=1 [xf1]; [xf1][v2] xfade=transition=fade:duration=1:offset=2 [xf2]; [xf2][v3] xfade=transition=fade:duration=1:offset=3 [xf3]; [xf3][v4] xfade=transition=fade:duration=1:offset=4 [xf4]" -map "[xf4]" -c:v libx264 -crf 18 -pix_fmt yuv420p output.mp4


  


  But when I put the input files and the filter in txt files, it fails with the error above :

  


  ffmpeg -stream_loop 1 -f concat -safe 0 -i concat_list.txt -/filter_complex filter_script.txt -map "[xf4]" -c:v libx264 -crf 18 -pix_fmt yuv420p output.mp4


  


  This is the concat_list.txt :

  


  file 'image1.jpg'
file 'image2.jpg'
file 'image3.jpg'
file 'image4.jpg'
file 'image5.jpg'


  


  This is the filter_script.txt :

  


  [0:v]trim=0:2,setpts=PTS-STARTPTS[v0];[1:v]trim=0:2,setpts=PTS-STARTPTS[v1];[2:v]trim=0:2,setpts=PTS-STARTPTS[v2];[3:v]trim=0:2,setpts=PTS-STARTPTS[v3];[4:v]trim=0:2,setpts=PTS-STARTPTS[v4];[v0][v1] xfade=transition=fade:duration=1:offset=1 [xf1];[xf1][v2] xfade=transition=fade:duration=1:offset=2 [xf2];[xf2][v3] xfade=transition=fade:duration=1:offset=3 [xf3];[xf3][v4] xfade=transition=fade:duration=1:offset=4 [xf4]


  


  I tried adding/removing line breaks, semicolons, etc. Nothing helped.
Any idea what is going wrong here ? Thank you very much !

  


  My ffmpeg version is the most recent one :

  


  ffmpeg version 2025-02-17-git-b92577405b-full_build-www.gyan.dev