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• ffmpeg - data is being "removed" while h264 is being processed by ffmpeg

  21 mai 2024, par Laki

  I got a file which is created based on messages coming from streaming, all of the "messages" are ending with b'h264\x00'
I got a need to

  


  

  • load the data into ffmpeg

  


  • perform some processing of the data

  


  • re-attach the data to same "messages"

  


  


  Data is loaded with ffmpeg and saved with ffmpeg - however - ffmpeg removes "part" of the data
I have simplified the process and currently I am only loading and saving the data, without any processing, but still - part of the data is being removed

  


  I have used several commands - but always, part of my data is being removed

  


  ffmpeg -i sthg3.h264  -c copy st3.h264
ffmpeg  -err_detect ignore_err -i sthg3.h264  -c copy st3.h264
ffmpeg -fflags +genpts -i sthg3.h264 -c copy st3.h264 


  


  I have created the script for calculating that

  


  file_out = 'sthg3.h264'
def split_file(input_file,chunki):
    output_files = []
    with open(input_file, 'rb') as f:
        file_number = 0
        while True:
            chunk = f.read(504096)  # Read a chunk of data
            if not chunk:  # End of file
                break
            index = chunk.find(chunki)  # Find the delimiter
            while index != -1:
                chunk = chunk[index+len(chunki):]
                file_number += 1
                index = chunk.find(chunki)  # Find the next delimiter
    return file_number

chunki = b'h264\x00'
print(split_file(file_out,chunki))
chunki = b'\x00\x01\x00'
print(split_file(file_out,chunki))
    
chunki = b'h264\x00'
#chunki = b'\x00\x00\xdc\x9e'
print(split_file('st3.h264',chunki))
chunki = b'\x00\x01\x00'
print(split_file('st3.h264',chunki))


  


  and here is the question, how to push data through ffmpeg to avoid removing data, or replace it with something that would not be removed ?

  


• Oddly-named file "not found" when trying to move/copy via MacOS Terminal [closed]

  15 juin 2024, par Ben C

  This is a head scratcher.

  


  I need to move these three oddly-named files from an external 2.5" SSD to my desktop. The file names were intended to have variables replaced by date info, however, clearly it didn't work. So I'm left with these filenames that MacOS seems to want to interpret rather than treat as a string. I wish it was as easy as tossing in single quotes or escaping chars, but so far, that hasn't worked.

  


  Files: Test01-$(internal:date_y)-$(internal:date_m)-$(internal:date_d)-.mp4 Test01-$(internal:date_y)-$(internal:date_m)-$(internal:date_d)-0001.mp4 Test01-$(internal:date_y)-$(internal:date_m)-$(internal:date_d)-0002.mp4

  


  I'm on MacOS. In the Finder, the files are not visible. But they are not hidden files.

  


  In Terminal, however, when I navigate to "/Volumes/TestDrive", then run a quick "ls", I can see all three files no problem. Including permissions, size, owners, full filename, etc.

  


  However, when I attempt to move the files to my desktop, and rename in the process (even if I don't rename), Terminal tells me that "No such file or folder can be found" or something very close to that.

  


  I've tried using mv and cp commands to put the filename in single quotes so the filename is read literally. Yet, I'm still given feedback that the file cannot be transferred because it cannot be found or doesn't exist.

  


  mv 'Test01-$(internal:date_y)-$(internal:date_m)-$(internal:date_d)-.mp4' ~/Desktop/Test01-01.mp4' 'cp 'Test01-$(internal:date_y)-$(internal:date_m)-$(internal:date_d)-.mp4' ~/Desktop/Test01-01.mp4

  


  When I try to escape special characters instead of quotes, I am also told the file doesn't exist. But clearly it does when I list out the contents of the drive. And there's only 3x .mp4 files, two hiddne files .fseventsd and some spotlight file.

  


  mv Test01-\$\(internal\:date_y\)-\$\(internal\:date_m\)-\$\(internal\:date_d\)-.mp4 ~/Desktop/Test01-01.mp4

  


  I've tried copying by inode. No luck. I've tried pulling the videos into ffmpeg (CLI based media mgmt tool) to see if I can get some info on the files, and same thing, ffmpeg (or ffprobe) both will tell me the file doesn't exist...even though I can list the files and see that it does.

  


  I hope I'm missing something obvious, but but it seems all the obvious approaches are not yet working for me.

  


  So my question is, what do I need to do to make these files "exist" so that I can rename them and back them up ? Happy to go down any rabbit hole.

  


  Thanks in advance !

  


• Getting "Unrecognized option '1'" when using "-map_metadata -1" to erase metadata with ffmpeg [closed]

  20 novembre 2024, par Nautilus Era

  Edit :
  
As said in the header, this question is not about programing and I will ask it on the appropriate Stack.
  
My confusion came from the fact that I am using Python to make my calls to the shell, however, it has nothing to do with the problem I am trying to solve.
  
Thank you for your time and sorry for the bother.

  


  ---

  


  I was trying to erase metadata from a file using ffmpeg using the
following command :

  


  ffmpeg –i $file_path –map_metadata -1 –c copy $stripped_video_output


  


  Where $file_path and $stripped_video_output are variables containing
their respective path.

  


  ffmpeg gave the answer :

  


  Unrecognized option '1'. 
Error splitting the argument list: Option not found


  


  I am using Debian 12.

  


  I tried with both the repository's version as well as a compiled version
of ffmpeg and I tried on two different computers.

  


  If anyone can help with that, I would appreciate it.

  


  Thank you in advance and have a good one.