[FFmpeg-user] teletext.dat

[william Gunnells]

Hello Carl Eugen

I have read the teletext.dat file byte by byte and the data doesn't make
sense. It should read similar to an srt file.

import binascii

with open('teletext.dat', 'rb') as f:
        byte=f.read(1)
        while byte:
                byte=f.read(1)
#               print byte
                blah=binascii.hexlify(byte)
                #print blah
                text=blah.decode('ascii')
                print text


prints out mostly FF FF etc... nothing that can be derived into an English
Sentence. Any thoughts?


On Sat, Feb 13, 2016 at 2:04 PM, william Gunnells <gunnells at gmail.com>
wrote:

> Hey Carl Eugen
>
> Correct ccextractor can extract subtitles from original ts just like
> ffmpeg. However ccextractor creates a ascii text file that you can read.
> ffmpeg seems to create a dat file. I'm have a hard time decoding the dat
> file. Not sure what format its in. hex, base64 qp. I thought perhaps the
> command that I was using was extracting both dvb_teletext and dvb_subtitle
> and populating the teletext.dat file with both content making it corrupted.
> I was looking into the map command option. But that seems confusing also.
>
> In the previous command ffmpeg is able to identify both:
>
> Stream #0:1[0x101](eng): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)
> Stream #0:2[0x102](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
>
>
>
>
> On Sat, Feb 13, 2016 at 6:30 AM, Carl Eugen Hoyos <cehoyos at ag.or.at>
> wrote:
>
>> william Gunnells <gunnells <at> gmail.com> writes:
>>
>> > ffmpeg -i output.ts -vn -an -f rawvideo -copyinkf -scodec copy
>> teletext.dat
>>
>> > With ccextractor I can extract both dvb_teletext and
>> > dvb_subtitle and populate a plain text file with time codes.
>>
>> Just to make sure I don't misunderstand:
>> You can read the file teletext.dat with ccextractor?
>>
>> Or is ccextractor able to export subtitles from the
>> original transport stream (just as FFmpeg can)?
>>
>> Carl Eugen
>>
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>
>