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Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
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FFmpeg psycho-visual options - psy-rdoq
7 avril 2020, par SLVRI'm new to encoding and I like to do my encodings in x265 10bit. Currently, I'm facing a little issue with ffmpeg. I noticed when I'm using libx265 encoder output file looks a little bit blurred or small detail loss. Code I used to do my encodes is



ffmpeg -i input.mp4 -c:v libx265 -preset medium -crf 22 -pix_fmt yuv420p10le -c:a copy -y output-x26510bit.mkv



I've found out psycho-visual options might help in this case. I modified my code in to



ffmpeg -i input.mp4 -c:v libx265 -preset medium -crf 22 -pix_fmt yuv420p10le -psy-rd 2 -psy-rdoq 4 --rdoq-level 1 -c:a copy -y output-x26510bit.mkv



When I issue the above command, I get an error code



C:\Users\abc\Desktop\1>ffmpeg -i input.mp4 -c:v libx265 -preset medium -crf 22 -pix_fmt yuv420p10le -psy-rd 2 -psy-rdoq
 4 -rdoq-level 1 -c:a copy -y output-x26510bit.mkv
ffmpeg version git-2020-04-03-52523b6 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 9.3.1 (GCC) 20200328
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enabl
e-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enabl
e-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --
enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-l
ibvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom
--enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --en
able-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
 libavutil 56. 42.102 / 56. 42.102
 libavcodec 58. 77.101 / 58. 77.101
 libavformat 58. 42.100 / 58. 42.100
 libavdevice 58. 9.103 / 58. 9.103
 libavfilter 7. 77.101 / 7. 77.101
 libswscale 5. 6.101 / 5. 6.101
 libswresample 3. 6.100 / 3. 6.100
 libpostproc 55. 6.100 / 55. 6.100
Unrecognized option 'psy-rdoq'.
Error splitting the argument list: Option not found



How do I solve this issue


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On Heroku I got FFMPEG::Error (Failed encoding.Errors : encoded file is invalid. Full output : )
8 octobre 2020, par Ruslan ValeevThe code is :


tempfile = Tempfile.open('content')
tempfile.write(content)
movie = FFMPEG::Movie.new(tempfile.path)
screenshot_temp_file = Tempfile.open('screenshot')
movie.screenshot(screenshot_temp_file.path)


everything works fine locally, but when I try this on Heroku I got error at last row :


irb(main):013:0> movie.screenshot(screenshot_temp_file.path)
I, [2020-10-07T15:48:27.132114 #7] INFO -- : Running transcoding...
["/app/vendor/ffmpeg/ffmpeg", "-y", "-i", "/tmp/content20201007-7-1g1955b", "-vframes", "1", "-f", "image2", "/tmp/screenshot20201007-7-1mmts7s"]

E, [2020-10-07T15:48:27.190572 #7] ERROR -- : Failed encoding...
["/app/vendor/ffmpeg/ffmpeg", "-y", "-i", "/tmp/content20201007-7-1g1955b", "-vframes", "1", "-f", "image2", "/tmp/screenshot20201007-7-1mmts7s"]


Errors: encoded file is invalid. 

Traceback (most recent call last):
 7: from /app/bin/irb:30:in `<main>'
 6: from /app/bin/irb:30:in `load'
 5: from /app/vendor/ruby-2.6.6/lib/ruby/gems/2.6.0/gems/irb-1.0.0/exe/irb:11:in `<top>'
 4: from (irb):13
 3: from /app/vendor/bundle/ruby/2.6.0/gems/streamio-ffmpeg-3.0.2/lib/ffmpeg/movie.rb:204:in `screenshot'
 2: from /app/vendor/bundle/ruby/2.6.0/gems/streamio-ffmpeg-3.0.2/lib/ffmpeg/transcoder.rb:45:in `run'
 1: from /app/vendor/bundle/ruby/2.6.0/gems/streamio-ffmpeg-3.0.2/lib/ffmpeg/transcoder.rb:112:in `validate_output_file'
FFMPEG::Error (Failed encoding.Errors: encoded file is invalid. Full output: )
</top></main>

I've try to pass some options, like
:seek_timeandvalidate: falsebut nothing changed. What am I doing wrong ? Thank you so much !

EDIT :
After
Full output: )there is nothing.
I've install FFMPEG buildpack on Heroku, and can see it in ui :



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Why AudioSegment doesn't read 'mp3' ?
22 octobre 2020, par freshITmeatI tried to read file that I give with absolute path.
When I run my code first that I see is this message :


D:\prog\datascience\anaconda\lib\site-packages\pydub\utils.py:170: RuntimeWarning: Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work
 warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning)


I tried this :


PATH_TO_FFMPEG = 'D:\\prog\\ffmpeg-win-2.2.2\\ffmpeg.exe'
pydub.AudioSegment.converter = r'D:\\prog\\ffmpeg-win-2.2.2\\ffmpeg.exe'


And I separately installed
ffmpegwithpip. But it didn't help.
When I try this :

raw_sound = pydub.AudioSegment.from_mp3(file=track_path)


where
track_pathis correct absolute path generated automatically.
So I got this this error :

Traceback (most recent call last):
 File "D:\prog\PyCharm Community Edition 2020.2.2\plugins\python-ce\helpers\pydev\pydevd.py", line 1448, in _exec
 pydev_imports.execfile(file, globals, locals) # execute the script
 File "D:\prog\PyCharm Community Edition 2020.2.2\plugins\python-ce\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile
 exec(compile(contents+"\n", file, 'exec'), glob, loc)
 File "D:/testtask2/test_task/testtask/get_mffc.py", line 165, in <module>
 slice_all_in_a_dir('May 27 2020 LNC/Hydrophone 1/raw_records')
 File "D:/testtask2/test_task/testtask/get_mffc.py", line 70, in slice_all_in_a_dir
 slice_samples(track_path= [file],
 File "D:/testtask2/test_task/testtask/get_mffc.py", line 48, in slice_samples
 raw_sound = pydub.AudioSegment.from_mp3(file=track_path)
 File "D:\prog\datascience\anaconda\lib\site-packages\pydub\audio_segment.py", line 738, in from_mp3
 return cls.from_file(file, 'mp3', parameters=parameters)
 File "D:\prog\datascience\anaconda\lib\site-packages\pydub\audio_segment.py", line 680, in from_file
 stdin_data = file.read()
AttributeError: 'list' object has no attribute 'read'
python-BaseException
</module>

Full code when I use it :


def slice_samples(track_path: list, save_path: str,
 sample_folder_name: str, interval: float, given_format, name: str = "part", export_format = 'wav'):
 """
 This metod slice given track to parts.
 :param track_path: str, a path to the track you want to slice
 :param save_path: str, a path to folder, where you want save sliced tracks
 :param sample_folder_name: str, you don't need to create a folder for sliced tracks,
 you can just write the name of the folder in this argument where you want to save tracks
 :param interval: float, measure in seconds, the length of sliced tracks
 :param name: str, name of sliced tacks
 :param given_format: str, I strongly recommend use .wav format initially, when you record sounds
 :return: folder with sliced tracks
 """

 # it cuts a file in mp3 or wav formats (wav recommended)

 interval_secs = interval * 10 ** 3
 raw_sound = None
 if given_format == "WAV":
 raw_sound = pydub.AudioSegment.from_wav(file=track_path)
 elif given_format == "MP3":
 raw_sound = pydub.AudioSegment.from_mp3(file=track_path)
 else:
 raise Exception("It's temporarily unsupported given_format: " + given_format)
 start = 0
 end = interval_secs
 i = 0
 while end < len(raw_sound):
 save_to = save_path + sample_folder_name + "/" + name + str(i)
 part = raw_sound[start:end]
 part.export(save_to, format=export_format)
 i += 1
 start += interval_secs
 end += interval_secs
 return save_path + sample_folder_name

def slice_all_in_a_dir(tracks_folder: str):
 files = os.listdir(tracks_folder)
 for file in files:
 folder_name = file.split('.')
 f_name = folder_name[0]
 file = tracks_folder+'/'+file
 file = os.path.abspath(file)
 slice_samples(track_path= [file],
 save_path= PATH_FOR_SLICED,
 sample_folder_name= f_name,
 interval=5,
 given_format=folder_name[1])

if __name__ == "__main__":
 slice_all_in_a_dir('May 27 2020 LNC/Hydrophone 1/raw_records')


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