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• python imageio.get_reader() returns odd exception

  17 août 2020, par tristan_jia

  import imageio

reader = imageio.get_reader("./t.mp4")


  


  As shown above, with python 3.6.10, it returns :

  


  >>> reader = imageio.get_reader("../")&#xA;Traceback (most recent call last):&#xA;  File "<stdin>", line 1, in <module>&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/core/functions.py", line 129, in get_reader&#xA;    return format.get_reader(request)&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/core/format.py", line 168, in get_reader&#xA;    return self.Reader(self, request)&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/core/format.py", line 217, in __init__&#xA;    self._open(**self.request.kwargs.copy())&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 357, in _open&#xA;    self._initialize()&#xA;  File "/home/tristan_jia/workspace/py3.6/venv/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 430, in _initialize&#xA;    shell=ISWIN)&#xA;  File "/usr/lib64/python3.6/subprocess.py", line 729, in __init__&#xA;    restore_signals, start_new_session)&#xA;  File "/usr/lib64/python3.6/subprocess.py", line 1364, in _execute_child&#xA;    raise child_exception_type(errno_num, err_msg, err_filename)&#xA;OSError: [Errno 8] Exec format error: &#x27;/home/tristan_jia/.imageio/ffmpeg/ffmpeg-linux64-v3.3.1&#x27;&#xA;&#xA;</module></stdin>

  


  I searched everywhere but haven't seen any similar questions. The script runs on Opensuse Leap 15.1, is it related to the system I use ?

  


• How to read errors when compiling from source code

  28 décembre 2022, par slyfox1186

  Goal :

  


  Compile multiple libraries from source code to ultimately install a fully compiled version of FFmpeg with desirable libraries attached.

  


  Problem :

  


  During the compilation, all libraries (seemingly) are successful until liblv2 is reached.

  


  Error output via terminal :

  


  building lv2 - version 1.18.10
=======================
Downloading https://lv2plug.in/spec/lv2-1.18.10.tar.xz as lv2-1.18.10.tar.bz2
... Done
Extracted lv2-1.18.10.tar.bz2
$ python3 ./waf configure --prefix=/home/jman/tmp/ffmpeg/ffmpeg-build/workspace --lv2-user
python3: can't open file '/home/jman/tmp/ffmpeg/ffmpeg-build/packages/lv2-1.18.10/./waf': [Errno 2] No such file or directory

Failed to Execute python3 ./waf configure --prefix=/home/jman/tmp/ffmpeg/ffmpeg-build/workspace --lv2-user


  


  Where I need guidance :

  


  python3: can't open file '/home/jman/tmp/ffmpeg/ffmpeg-build/packages/lv2-1.18.10/./waf': [Errno 2] No such file or directory


  


  My question :

  


  What does this part mean ?

  


  lv2-1.18.10/./waf'

specifically the part /./


  


  My best guess so far is it :

  


  

  1. obviously is looking for a directory it can't find (perhaps because it truly doesn't exist)

  


  2. The missing 'waf' directory should be located inside either the "${PACKAGES}" or "${WORKSPACE}" directory.

  


  


  The ${PACKAGES}" path in this script should = /home/jman/tmp/ffmpeg/ffmpeg-build/packages

  


  The ${WORKSPACE}" path in this script should = /home/jman/tmp/ffmpeg/ffmpeg-build/workspace

  


  The full build script :

  


  https://github.com/slyfox1186/ffmpeg-build-script/blob/master/scripts/build-ffmpeg

  


  I tried my best to make this worth sometimes time without giving too much info... sorry if I don't meet the expectations of this forum.

  


  Am I even close ?

  


• Converting From 4-bit RAW Audio to WAV (or another output format)

  10 février 2017, par Haravikk

  Okay, so I’ve got some .raw files from an old game (Zork Nemesis) and determined that they’re audio files, however I’m having trouble converting them into something meaningful.

  With a bit of trial and error in Audacity I’ve found that I can listen to a still noisy version of the audio using raw file input settings of 8-bit signed PCM in stereo with a sample rate of 22050hz. However, my suspicion is that the files may in fact be encoded in 4-bits with a sample rate of 44100hz, but I’m having trouble finding a tool that can handle this.

  What I’m looking for is either a tool that can handle 4-bit raw formats, or even a tool that can determine (or guess at) the format of a given .raw file, so I know for sure what I’m dealing with (as I’m just going by trial and error so far).

  I’ve tried sox, but I’m most likely doing something wrong as it complains of an unsupported size :

  sox -r 44100 -e signed -b 4 -c 2 in.raw out.wav

  I was also going to try ffmpeg, but I can’t find the appropriate format/codec to set.

  In case it gives any further clues ; I’ve tried various combinations of settings, increasing sample size while decreasing sample rate increases the (white-)noise, and even 8-bit is still noisy, which is why I’m thinking 4-bit. I’ve tried signed and unsigned, which strangely doesn’t seem to make much of a difference