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• Merging two mp4 files

  2 janvier 2021, par Michael Hofmann

  I have two mp4 files. One contains the audio and the other one the video. Now I want to merge them using python.

  


  input_video = ffmpeg.input(application_path+"/tmp/video.mp4")
input_audio = ffmpeg.input(application_path+"/tmp/audio.mp4")
ffmpeg.concat(input_video, input_audio, v=1, a=1).output(application_path+"/fused.mp4").run()


  


  I get a FileNotFoundError: [WinError 2] The system cannot find the file specified in the third line. I have no clue what I am doing wrong. I tried it with ffmpeg.concat(input_video, input_audio, v=1, a=1).output(application_path+).run() and got the same error.

  


  I do not have to stick to ffmpeg, but a command-line solution isn't going to work for me, because it will run on other PCs.

  


  Edit :
Full Error Message

  


  File "c:\YouTubeDownloader\YouTubeDownloader.py", line 97, in <module>&#xA;    ffmpeg.concat(input_video, input_audio, v=1, a=1).output(os.path.join(application_path, "fused.mp4")).run()&#xA;  File "C:\Users\Michael Hofmann\AppData\Local\Programs\Python\Python39\lib\site-packages\ffmpeg\_run.py", line 313, in run&#xA;    process = run_async(&#xA;  File "C:\Users\Michael Hofmann\AppData\Local\Programs\Python\Python39\lib\site-packages\ffmpeg\_run.py", line 284, in run_async&#xA;    return subprocess.Popen(&#xA;  File "C:\Users\Michael Hofmann\AppData\Local\Programs\Python\Python39\lib\subprocess.py", line 947, in __init__&#xA;    self._execute_child(args, executable, preexec_fn, close_fds,&#xA;  File "C:\Users\Michael Hofmann\AppData\Local\Programs\Python\Python39\lib\subprocess.py", line 1416, in _execute_child&#xA;    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,&#xA;FileNotFoundError: [WinError 2] Das System kann die angegebene Datei nicht finden&#xA;</module>

  


• python3.6 ffmpeg call MacOSX (closed)

  10 avril 2017, par Awazleon

  I’m using Python 3.6 on MacOSX. I would like to use FFmpeg as Python sub-process. Everything works fine when using the OSX embedded Python 2.7 but using 3.6, this doesn’t work.
  I’ve got an error message because it doesn’t find FFmepg.

  raise FFExecutableNotFoundError("Executable ’0’ not found".format(self.executable))
  ffmpy.FFExecutableNotFoundError : Executable ’ffmpeg’ not found

  As you can se I tried with ffmpy but I also got the same result by invoking FFmpeg directly

  from subprocess import call
  call(["ffmpeg"])
  Traceback (most recent call last) :
  File "", line 1, in
  call(["ffmpeg"])
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 267, in call
  with Popen(*popenargs, **kwargs) as p :
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 707, in init
  restore_signals, start_new_session)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 1326, in _execute_child
  raise child_exception_type(errno_num, err_msg)
  FileNotFoundError : [Errno 2] No such file or directory : ’ffmpeg’

  I installed the FFmpeg lib. by using Brew through Terminal. It was well installed but only visible by Python 2.7, not 3.6.

  Calling it from terminal is working :

  iMac-de-xxxxx : utilisateur$ ffmpeg

  ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  configuration : —prefix=/usr/local/Cellar/ffmpeg/3.2.4 —enable-shared —enable-pthreads —enable-gpl —enable-version3 —enable-hardcoded-tables —enable-avresample —cc=clang —host-cflags= —host-ldflags= —enable-libmp3lame —enable-libx264 —enable-libxvid —enable-opencl —disable-lzma —enable-vda

  I’m not (yet) a Linux specialist but I think that a path is missing for 3.6 to find FFmpeg.
  Any clue to solve this annoying issue ?

• Out of memory on ffmpeg when converting to H265

  18 août 2017, par Lion

  I’ve a bunch of video files, mostly H264. To save storage, I wrote a batch script, that converts all of them to H265 using ffmpeg. Problem : Some files cause ffmpeg to use ALL my memory (24 GB). Then it crashes (cause it try to allocate even more RAM), which stops the converting process.

  I think that these files are corrupt in some kind. Because with other files, it works well with low memory consumption. Now I want to reject those broken ones, so that unattended converting is possible.

  How is it possible to detect such corruption ? Can ffmpeg do this, or is a third party tool required ?

  My ffmpeg call

  set crf=20
  
  set codec=265
  
  
  
  ffmpeg -hide_banner -i "!fullSourcePath!" -c:v libx%codec% -crf %crf% "%targetPath%\!targetFileName!"

  mkvalidator can’t help

  mkvalidator says that a corrupt file is valid :

  mkvalidator.exe "V:\Filme\_LegacyFormat\22 Jump Street.mkv"
  
  ........................................................................................................................
  
  WRN0D0: There are 5306 bytes of void data..
  
  
  
  mkvalidator 0.5.0: the file appears to be valid
  
          file created with libebml v1.3.0 + libmatroska v1.4.1 / mkvmerge v6.9.1 ('Blue Panther') 64bit built on Apr 18 2014 18:23:38

  eac3to331 can’t help, too

  I found the tool eac3to331, which has a check flag. But it gave me no errors, although the tested file seems corrupt (cause my PC to crash after several minutes running ffmpeg)

  eac3to.exe -check "V:\Filme\_LegacyFormat\22 Jump Street.mkv"
  
  MKV, 1 video track, 2 audio tracks, 1 subtitle track, 1:51:57, 24p /1.001
  
  1: h264/AVC, English, 1920x808 24p /1.001 (240:101)
  
  2: DTS, German, 5.1 channels, 1509kbps, 48kHz
  
  3: DTS, English, 5.1 channels, 1509kbps, 48kHz
  
  4: Subtitle (SRT), German
  
  v01 Extracting video track number 1...
  
  a02 Extracting audio track number 2...
  
  a03 Extracting audio track number 3...
  
  s04 Extracting subtitle track number 4...
  
  Video track 1 contains 161039 frames.
  
  eac3to processing took 1 minute, 26 seconds.
  
  Done.