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ffmpeg-python Stream specifier '' in filtergraph description [0]concat=n=1[s0] matches no streams

I am trying to concat a list of audio inputs using ffmpeg-python. The exception in the question title is being thrown when attempting to execute the following code:
music_streams = []
for path in random.choices(os.listdir(music_dir), k=song_count):
path = os.path.join(music_dir, path)
music = ffmpeg.input(path)
music_streams.append(music)
music_joined = ffmpeg.concat(*music_streams)
out = ffmpeg.output(music_joined, 'out.mp3')
out.run()
Need advice on how to do this correctly. Thank you.

Ended up solving this on my own. Adding v=0 and a=1 arguments to the concat call and it is working as expected. If someone can explain what was going on here, I will +1 you for sure. Fairly new to ffmpeg. I am assuming the exception is because it is also trying to concat video streams (and their subtitles?), but since these are audio files, there are none. ffmpeg-python needs to know this explicitly. Could be wrong on my understanding, though.
music_joined = ffmpeg.concat(*music_streams, v=0, a=1)

MoviePy - getting progress bar values

I am running a python script which converts a video file to a audio clip using moviepy.
def convert(mp3_file,mp4_file):
videoclip = VideoFileClip(mp4_file)
audioclip = videoclip.audio
audioclip.write_audiofile(mp3_file)
audioclip.close()
videoclip.close()
I found out that Moviepy uses a library called Proglog to print a command line progress bar.
How do I get these process completion percentage values?

WARNING: Bruteforce ahead!
It is possible, however, moviepy has no official method to do this.
We can get the progress inside the source code of the module
we need to edit the module code and follow the steps. [This is for ubuntu linux]
Step 1 -
go to the ffmpg_writter.py [usually in /home/anipr/.local/lib/python3.10/site-packages/moviepy/video/io/ffmpeg_writer.py]
Step 2 -
go to line 221 and add calculate the percentage based on duration - get_the_persentage_of_progress = (t/clip.duration)*100
Step - 3
do anything with the variable get_the_persentage_of_progress
however, getting the variable back to our original code is a bit tricky.
here are a few ideas -
write it to a file.txt
insert into database
[let me know in comments if any better idea]

Moviepy unable to read duration of file

I have been using Moviepy to combine several shorter video files into hour long files. Some small files are "broken", they contain video but was not completed correctly (i.e. they play with VLC but there is no duration and you cannot skip around in the video).
I noticed this issue when I try to create a clip using VideoFileClip(file) function. The error that comes up is:
MoviePy error: failed to read the duration of file
Is there a way to still read the "good" frames from this video file and then add them to the longer video?
UPDATE
To clarify, my issue specifically is with the following function call:
clip = mp.VideoFileClip("/home/test/"+file)
Stepping through the code it seems to be an issue when checking the duration of the file in ffmpeg_reader.py where it looks for the duration parameter in the video file. However, since the file never finished recording properly this information is missing. I'm not very familiar with the way video files are structured so I am unsure of how to proceed from here.

You're correct. This issue arises commonly when the video duration info is missing from the file.
Here's a thread on the issue: GitHub moviepy issue 116
One user proposed the solution of using MP4Box to convert the video using this guide: RASPIVID tutorial
The final solution that worked for me involved specifying the path to ImageMagick's binary file as WDBell mentioned in this post.
I had the path correctly set in my environment variables, but it wasn't till I specificaly defined it in config_defaults.py that it started working:

I solved it in a simpler way, with the help of VLC I converted the file to the forma MPEG4 xxx TV/device,
and you can now use your new file with python without any problem
xxx = 720p or
xxx = 1080p
everything depends on your choice on the output format
I already answered this question on the blog: https://github.com/Zulko/moviepy/issues/116

This issue appears when VideoFileClip(file) function from moviepy it looks for the duration parameter in the video file and it's missing. To avoid this (in those corrupted files cases) you should make sure that the total frames parameter is not null before to shoot the function: clip = mp.VideoFileClip("/home/test/"+file)
So, I handled it in a simpler way using cv2.
The idea:
find out the total frames
if frames is null, then call the writer of cv2 and generate a temporary copy of the video clip.
mix the audio from the original video with the copy.
replace the original video and delete copy.
then call the function clip = mp.VideoFileClip("/home/test/"+file)
Clarification: Since OpenCV VideoWriter does not encode audio, the new copy will not contain audio, so it would be necessary to extract the audio from the original video and then mix it with the copy, before replacing it with the original video.
You must import cv2
import cv2
And then add something like this in your code before the evaluation:
cap = cv2.VideoCapture("/home/test/"+file)
frames = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
fps = int(cap.get(cv2.CAP_PROP_FPS))
print(f'Checking Video {count} Frames {frames} fps: {fps}')
This will surely return 0 frames but should return at least framerate (fps).
Now we can set the evaluation to avoid the error and handle it making a temp video:
if frames == 0:
print(f'No frames data in video {file}, trying to convert this video..')
writer = cv2.VideoWriter("/home/test/fixVideo.avi", cv2.VideoWriter_fourcc(*'DIVX'), int(cap.get(cv2.CAP_PROP_FPS)),(int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)),int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))))
while True:
ret, frame = cap.read()
if ret is True:
writer.write(frame)
else:
cap.release()
print("Stopping video writer")
writer.release()
writer = None
break
Mix the audio from the original video with the copy. I have created a function for this:
def mix_audio_to_video(pathVideoInput, pathVideoNonAudio, pathVideoOutput):
videoclip = VideoFileClip(pathVideoInput)
audioclip = videoclip.audio
new_audioclip = CompositeAudioClip([audioclip])
videoclipNew = VideoFileClip(pathVideoNonAudio)
videoclipNew.audio = new_audioclip
videoclipNew.write_videofile(pathVideoOutput)
mix_audio_to_video("/home/test/"+file, "/home/test/fixVideo.avi", "/home/test/fixVideo.mp4")
replace the original video and delete copys:
os.replace("/home/test/fixVideo.mp4", "/home/test/"+file)

I had the same problem and I have found the solution.
I don't know why but if we enter the path in this method path = r'<path>' instead of ("F:\\path") we get no error.

Just click on the
C:\Users\gladi\AppData\Local\Programs\Python\Python311\Lib\site-packages\moviepy\video\io\ffmpeg_reader.py
and delete the the code and add this one
Provided by me in GITHUB - https://github.com/dudegladiator/Edited-ffmpeg-for-moviepy

clip1=VideoFileClip('path')
c=clip1.duration
print(c)

Audio corrective feedback on psychopy (older version that supports sound)

As some of you may know, psychopy has errors playing sound files on the newer versions, so I have the oldest version installed currently and am trying to make audio corrective feedback for a behavioral test meant to be in an fMRI scanner. The feedback is needed to keep the participants awake. I'm having a lot of trouble finding how to code it correctly, as nothing I've tried works (I've gotten plenty of errors, the main one being invalid Syntax), as I am not using the builder. I am very new at coding. This is what I have so far:
cue = visual.TextStim(myWin, pos = [0.0,0.0],color = -1)
fix = visual.TextStim(myWin,text = '+',height = 1.0,color = -1)
begin_text = ('Press the space bar to begin')
hit_sound = sound.Sound(value='G', secs=0.5, octave=4, sampleRate=44100, bits=16)
miss_sound = sound.Sound(value='G', secs=0.5, octave=3, sampleRate=44100, bits=16)
cue_type = ['either_color', 'either_shape', 'either_nochange', 'either_nochange', 'color', 'color_nochange', 'shape', 'shape_nochange']#trial types
cue_type*=num_trials #number of trials
random.shuffle(cue_type) #randomizing trials
if key_resp.corr
feedback= hit_sound.play
else:
feedback= miss_sound.play
Thank you in advance.

Are you coding this from scratch or transferred from builder to coder view and making edits? If you are making edits in the coder view, make sure the indents and punctuations remain the same.
From what you've shared, I can see that
if key_resp.corr
feedback= hit_sound.play
else:
feedback= miss_sound.play
should be:
if key_resp.corr:
hit_sound.play()
else:
miss_sound.play()

Read binary data off Windows clipboard, in Blender (python)

EDIT: Figured THIS part out, but see 2nd post below for another question.
(a little backstory here, skip ahead for the TLDR :) )
I'm currently trying to write a few scripts for Blender to help improve the level creation workflow for a game that I play (Natural Selection 2). Currently, to move geometry from the level editor to Blender, I have to 1) Save a file from the editor as an .obj 2) import obj into blender, and make my changes. Then I 3) export to the game's level format using an exporter script I wrote, and 4) re-open the file in a new instance of the editor. 5) copy the level data from the new instance. 6) paste into the main level file. This is quite a pain to do, and quite clearly discourages even using the tool at all but for major edits. My idea for an improved workflow: 1) Copy data to clipboard in editor 2) Run importer script in Blender to load data. 3) Run exporter script in blender to save data. 4) Paste back into original file. This not only cuts out two whole steps in the tedious process, but also eliminates the need for extra files cluttering up my desktop. Currently though, I haven't found a way to read in clipboard data from the Windows clipboard into Blender... at least not without having to go through some really elaborate installation steps (eg install python 3.1, install pywin32, move x,y,z to the blender directory, uninstall python 3.1... etc...)
TLDR
I need help finding a way to write/read BINARY data to/from the clipboard in Blender. I'm not concerned about cross-platform capability -- the game tools are Windows only.
Ideally -- though obviously beggars can't be choosers here -- the solution would not make it too difficult to install the script for the layman. I'm (hopefully) not the only person who is going to be using this, so I'd like to keep the installation instructions as simple as possible. If there's a solution available in the python standard library, that'd be awesome!
Things I've looked at already/am looking at now
Pyperclip -- plaintext ONLY. I need to be able to read BINARY data off the clipboard.
pywin32 -- Kept getting missing DLL file errors, so I'm sure I'm doing something wrong. Need to take another stab at this, but the steps I had to take were pretty involved (see last sentence above TLDR section :) )
TKinter -- didn't read too far into this one as it seemed to only read plain-text.
ctypes -- actually just discovered this in the process of writing this post. Looks scary as hell, but I'll give it a shot.

Okay I finally got this working. Here's the code for those interested:
from ctypes import *
from binascii import hexlify
kernel32 = windll.kernel32
user32 = windll.user32
user32.OpenClipboard(0)
CF_SPARK = user32.RegisterClipboardFormatW("application/spark editor")
if user32.IsClipboardFormatAvailable(CF_SPARK):
data = user32.GetClipboardData(CF_SPARK)
size = kernel32.GlobalSize(data)
data_locked = kernel32.GlobalLock(data)
text = string_at(data_locked,size)
kernel32.GlobalUnlock(data)
else:
print('No spark data in clipboard!')
user32.CloseClipboard()

Welp... this is a new record for me (posting a question and almost immediately finding an answer).
For those interested, I found this: How do I read text from the (windows) clipboard from python?
It's exactly what I'm after... sort of. I used that code as a jumping-off point.
Instead of CF_TEXT = 1
I used CF_SPARK = user32.RegisterClipboardFormatW("application/spark editor")
Here's where I got that function name from: http://msdn.microsoft.com/en-us/library/windows/desktop/ms649049(v=vs.85).aspx
The 'W' is there because for whatever reason, Blender doesn't see the plain-old "RegisterClipboardFormat" function, you have to use "...FormatW" or "...FormatA". Not sure why that is. If somebody knows, I'd love to hear about it! :)
Anyways, haven't gotten it actually working yet: still need to find a way to break this "data" object up into bytes so I can actually work with it, but that shouldn't be too hard.
Scratch that, it's giving me quite a bit of difficulty.
Here's my code
from ctypes import *
from binascii import hexlify
kernel32 = windll.kernel32
user32 = windll.user32
user32.OpenClipboard(0)
CF_SPARK = user32.RegisterClipboardFormatW("application/spark editor")
if user32.IsClipboardFormatAvailable(CF_SPARK):
data = user32.GetClipboardData(CF_SPARK)
data_locked = kernel32.GlobalLock(data)
print(data_locked)
text = c_char_p(data_locked)
print(text)
print(hexlify(text))
kernel32.GlobalUnlock(data_locked)
else:
print('No spark data in clipboard!')
user32.CloseClipboard()
There aren't any errors, but the output is wrong. The line print(hexlify(text)) yields b'e0cb0c1100000000', when I should be getting something that's 946 bytes long, the first 4 of which should be 01 00 00 00. (Here's the clipboard data, saved out from InsideClipboard as a .bin file: https://www.dropbox.com/s/bf8yhi1h5z5xvzv/testLevel.bin?dl=1 )