Video file to subtitles file

[Barry Scott]

> On 29 Aug 2020, at 12:51, Muskan Sanghai <muskansanghai at 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... at barrys-emacs.org <http://barrys-emacs.org/>> wrote: 
>>> 
>>> 
>>> 
>>>> On 28 Aug 2020, at 17:37, Muskan Sanghai <muskan... at 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... at 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


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