🌐 Mailman 3 August 2020 - Python-list - python.org

Re: Threading plus multiprocessing plus cv2 error
by Stephane Tougard Aug. 30, 2020

Aug. 30, 2020

On 2020-08-29, Dennis Lee Bieber <wlfraed(a)ix.netcom.com> wrote: > Under Linux, multiprocessing creates processes using fork(). That means > that, for some fraction of time, you have TWO processes sharing the same > thread and all that entails (if it doesn't overlay the forked process with > a new executable, they are sharing the thread until the thread exits). > same error condition even with the sleep(1) in place. I'm not even that makes sense, how 2 processes can share a thread ?

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Re: Video file to subtitles file
by Muskan Sanghai Aug. 30, 2020

Aug. 30, 2020

On Friday, August 28, 2020 at 10:59:29 PM UTC+5:30, Chris Angelico wrote: > On Sat, Aug 29, 2020 at 3:24 AM Barry <ba...(a)barrys-emacs.org> wrote: > > > > > > > > > On 28 Aug 2020, at 17:37, Muskan Sanghai <muskan...(a)gmail.com> wrote: > > > > > > On Friday, August 28, 2020 at 12:27:25 AM UTC+5:30, Barry Scott wrote: > > >>>> On 27 Aug 2020, at 18:00, Muskan Sanghai <muskan...(a)gmail.com> wrote: > > >>> > > >>> I would be really thankful if someone can suggest me how can I generate subtitles file (srt format) from a video or audio without using Google cloud and AWS. > > >> What do you know about how subtitles work with video? Do you mean you want to extract the bitmap subtitle data from a MPEG video? > > >> > > >> Barry > > >> > > >> > > >> > > >>> -- > > >>> https://mail.python.org/mailman/listinfo/python-list > > >>> > > > > > > Thank you Barry for your reply, > > > I just know the basics and I want to extract subtitles from a MPEG video and then put the subtitles in that same video. Subtitles can be of any format but it should be convenient for the entire procedure. > > > > It seems you are looking for an App to do this work? > > I searched the web and saw this. > > > > https://www.openshot.org/ > > > > I have not used this app, maybe it’s a starting point for you. > > > > Barry > > > Not familiar with Openshot, but it's worth looking into. > Alternatively, I'd definitely recommend ffmpeg for anything like this > sort of job. But if you actually need to OCR something, then you may > need to do some scripting work. I don't have code to offer you, but it > would involve FFMPEG to lift the images, something like Tesseract to > do the actual OCRing, and then you'd write the rest of it yourself in > Python. > > Other than that, this probably is something best done with a dedicated > movie editing tool, not Python. Use what exists. > > ChrisA I want to extract subtitles from a MPEG video (which does not have any previous subtitles) and then add them to the same video . So is it possible to do it with some scripting. Actually I tried to find the same features in FFMPEG but couldn't.

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Silly question, where is read() documented?
by Chris Green Aug. 30, 2020

Aug. 30, 2020

Well it sounds a silly question but I can't find the documentation for read(). It's not a built-in function and it's not documented with (for example) the file type object sys.stdin. So where is it documented? :-) -- Chris Green ·

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Re: Where read() is documented
by Chris Green Aug. 30, 2020

Aug. 30, 2020

Stefan Ram <ram(a)zedat.fu-berlin.de> wrote: > Chris Green <cl(a)isbd.net> writes: I can't find the documentation for > >read(). It's not a built-in function and it's not documented with > >(for example) the file type object sys.stdin. > > |read() (asyncio.StreamReader method), 894 > |read() (chunk.Chunk method), 1385 > |read() (codecs.StreamReader method), 164 > |read() (configparser.ConfigParser method), 537 > |read() (http.client.HTTPResponse method), 1276 > |read() (imaplib.IMAP4 method), 1291 > |read() (in module os), 578 > |read() (io.BufferedIOBase method), 622 > |read() (io.BufferedReader method), 625 > |read() (io.RawIOBase method), 621 > |read() (io.TextIOBase method), 626 > |read() (mimetypes.MimeTypes method), 1146 > |read() (mmap.mmap method), 1053 > |read() (ossaudiodev.oss_audio_device method), 1388 > |read() (ssl.MemoryBIO method), 1024 > |read() (ssl.SSLSocket method), 1005 > |read() (urllib.robotparser.RobotFileParser method), 1268 > |read() (zipfile.ZipFile method), 499 > Index of "The Python Library Reference, Release 3.9.0a3" > > But none of those is the documentation for read(), they're just places that refer to read(). -- Chris Green ·

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Re: Python 3 how to convert a list of bytes objects to a list of strings?
by Chris Green Aug. 30, 2020

Aug. 30, 2020

Dennis Lee Bieber <wlfraed(a)ix.netcom.com> wrote: > On Fri, 28 Aug 2020 12:26:07 +0100, Chris Green <cl(a)isbd.net> declaimed the > following: > > > > >Maybe I shouldn't but Python 2 has been managing to do so for several > >years without any issues. I know I *could* put the exceptions in a > >bucket somewhere and deal with them separately but I'd really rather > >not. > > > > In Python2 "string" IS BYTE-STRING. It is never UNICODE, and ignores > any encoding. > > So, for Python3, the SAME processing requires NOT USING "string" (which > is now Unicode) and ensuring that all literals are b"stuff", and using the > methods of the bytes data type. > Now I'm beginning to realise that *this* may well be what I need to do, after going round in several convoluted circles! :-) Thank you! -- Chris Green ·

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Finally fixed my Python 2 to Python 3 e-mail problem
by Chris Green Aug. 30, 2020

Aug. 30, 2020

I've started a new thread because this relates to two or three threads I started here over the past few days. First, thank you everyone for all the help and suggestions. I've finally fixed the problem, it was due to sys.stdin.read() returning a string object in Python 3 as opposed to bytes in Python 2. So, the code that reads an incoming message was:- msg = mailbox.mboxMessage(sys.stdin.read()) ... and msg eventually gets passed into mailbox.mbox.add(msg) This works fine in Python 2 but fails with a "can't encode" error in Python 3 (deep down in the mailbox code). The cause of the problem is that Python 3's sys.stdin.read() returns a string, so changing the above line to:- msg = mailbox.mboxMessage(sys.stdin.buffer.read()) fixes the problem. It took me quite a while to find the answer, mainly because I was thinking the wrong way round, trying to make my message into a string, whereas what I needed to do was keep it as a 'byte string' (I still think there should be a better name for that!). Again, thank you everyone for all the help, it did get me there in the end! -- Chris Green ·

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FW: pip not recognized
by gpostle500 Aug. 29, 2020

Aug. 29, 2020

Sent from my Verizon, Samsung Galaxy smartphone -------- Original message --------From: geoff postle <gpostle500(a)gmail.com> Date: 8/27/20 12:08 PM (GMT-08:00) To: python-list(a)python.org Subject: pip not recognized Hey just downloaded the 3.8.5 and when I search for pip in cmd it doesn’t show up and says not recognized. Trying to figure out why that is since I didn’t change the default selection and left the box with pip checked Sent from Mail for Windows 10

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Can't use interpreter
by Joshua Sharma Aug. 29, 2020

Aug. 29, 2020

I have downloaded python 3.7.6, but I can't seem to use it in PyCharm. I have subscribed.

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Re: Video file to subtitles file
by Muskan Sanghai Aug. 29, 2020

Aug. 29, 2020

On Saturday, August 29, 2020 at 6:44:34 PM UTC+5:30, Barry Scott wrote: > > On 29 Aug 2020, at 12:51, Muskan Sanghai <muskan...(a)gmail.com> wrote: > > > > On Friday, August 28, 2020 at 10:59:29 PM UTC+5:30, Chris Angelico wrote: > >> On Sat, Aug 29, 2020 at 3:24 AM Barry <ba...(a)barrys-emacs.org <http://barrys-emacs.org/>> wrote: > >>> > >>> > >>> > >>>> On 28 Aug 2020, at 17:37, Muskan Sanghai <muskan...(a)gmail.com> wrote: > >>>> > >>>> On Friday, August 28, 2020 at 12:27:25 AM UTC+5:30, Barry Scott wrote: > >>>>>>> On 27 Aug 2020, at 18:00, Muskan Sanghai <muskan...(a)gmail.com> wrote: > >>>>>> > >>>>>> I would be really thankful if someone can suggest me how can I generate subtitles file (srt format) from a video or audio without using Google cloud and AWS. > >>>>> What do you know about how subtitles work with video? Do you mean you want to extract the bitmap subtitle data from a MPEG video? > >>>>> > >>>>> Barry > >>>>> > >>>>> > >>>>> > >>>>>> -- > >>>>>> https://mail.python.org/mailman/listinfo/python-list > >>>>>> > >>>> > >>>> Thank you Barry for your reply, > >>>> I just know the basics and I want to extract subtitles from a MPEG video and then put the subtitles in that same video. Subtitles can be of any format but it should be convenient for the entire procedure. > >>> > >>> It seems you are looking for an App to do this work? > >>> I searched the web and saw this. > >>> > >>> https://www.openshot.org/ > >>> > >>> I have not used this app, maybe it’s a starting point for you. > >>> > >>> Barry > >>> > >> Not familiar with Openshot, but it's worth looking into. > >> Alternatively, I'd definitely recommend ffmpeg for anything like this > >> sort of job. But if you actually need to OCR something, then you may > >> need to do some scripting work. I don't have code to offer you, but it > >> would involve FFMPEG to lift the images, something like Tesseract to > >> do the actual OCRing, and then you'd write the rest of it yourself in > >> Python. > >> > >> Other than that, this probably is something best done with a dedicated > >> movie editing tool, not Python. Use what exists. > >> > >> ChrisA > > I want to extract subtitles from a MPEG video (which does not have any previous subtitles) > If it has no subtitles there is nothing to extract? > > and then add them to the same video . > > So is it possible to do it with some scripting. Actually I tried to find the same features in FFMPEG but couldn't. > ffmpreg I doubt has the APIs you need for this. > > Have a look at GStreamer, which has pytohn APIs. I know it can handle subtitles because the company > I used to work for paid for subtitle support to be added to GStreamer for a product > I worked on a few years ago. > > I recall that in MPEG subtitles are RLE encoded bitmaps with timing and position data. > Which allows the player to show this bitmap at position X, Y starting at T0 and remove at t1 etc. > You have to track multiple subtitles at the same time. > > You should be able to extract the subtitle bit maps and timing data with modest work. > You could use OCR technology to turn the subtitles into text. > > Barry > > > > -- > > https://mail.python.org/mailman/listinfo/python-list <https://mail.python.org/mailman/listinfo/python-list> Actually the video is in MP4 format and does not have subtitles in it. But I will surely try to use GStreamer as you have suggested.

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Re: Video file to subtitles file
by Muskan Sanghai Aug. 29, 2020

Aug. 29, 2020

On Friday, August 28, 2020 at 10:52:57 PM UTC+5:30, Barry wrote: > > On 28 Aug 2020, at 17:37, Muskan Sanghai <muskan...(a)gmail.com> wrote: > > > > On Friday, August 28, 2020 at 12:27:25 AM UTC+5:30, Barry Scott wrote: > >>>> On 27 Aug 2020, at 18:00, Muskan Sanghai <muskan...(a)gmail.com> wrote: > >>> > >>> I would be really thankful if someone can suggest me how can I generate subtitles file (srt format) from a video or audio without using Google cloud and AWS. > >> What do you know about how subtitles work with video? Do you mean you want to extract the bitmap subtitle data from a MPEG video? > >> > >> Barry > >> > >> > >> > >>> -- > >>> https://mail.python.org/mailman/listinfo/python-list > >>> > > > > Thank you Barry for your reply, > > I just know the basics and I want to extract subtitles from a MPEG video and then put the subtitles in that same video. Subtitles can be of any format but it should be convenient for the entire procedure. > It seems you are looking for an App to do this work? > I searched the web and saw this. > > https://www.openshot.org/ > > I have not used this app, maybe it’s a starting point for you. > > Barry > > > -- > > https://mail.python.org/mailman/listinfo/python-list > > I actually want to create an app or website which can do this.

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