ffmpeg - How to combine two Filters ... Black Bands and DVB Subtitles

[mapg]

Hi all,

I would like to combine two kind of filters and I do not know how.

It's about add black bands for those videos who do not fit a full HD resolution (in this case) and adding subtitles from a stream source...

The filters are as follow ...

Black bands ...

-filter:v 'scale=1920:-1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2'

DVB Subtitles coming from a stream ...

-filter_complex '[0:v][0:s:1]overlay[v]' -map [v] -map 0:a

I hope somebody might help.

Thank you very much in advance indeed!!

Kindest regards,
Mapg

[Selur]

have you tried simply calling one after the other?

-filter:v 'scale=1920:-1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2' -filter_complex '[0:v][0:s:1]overlay[v]'  -map [v] -map 0:a

[mapg]

Selur,

I get the following error ...

Filtergraph 'scale=1920:-1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2' was specified through the -vf/-af/-filter option for output stream 0:0, which is fed from a complex filtergraph.

-vf/-af/-filter and -filter_complex cannot be used together for the same stream.

Best regards,
Mapg

[Selur]

Then don't use overlay through filter_complex, but also through vf or move everything into a filter_complex call.

something like:

[0:v]scale=1920:-1[scaled];[scaled]pad=1920:1080:(ow-iw)/2:(oh-ih)/2[video];[video][0:s:1]overlay[v];

here's my thinking behind it:
'[0:v]scale=1920:-1[scaled];' should take [0:v] = the first video track from source 1, scale it and provide the output for later filter under the variable 'scaled'
'[scaled]pad=1920:1080:(ow-iw)/2:(oh-ih)/2[video];' should take the content under 'scaled', evenly add padding to it to reach 1920x1080 and provide the output under for later filters under the variable 'video'

'[video][0:s:1]overlay[v]', should take 'video' and the subtitle stream number 1, overlay the later over the first and then output the combination under 'v'

[mapg]

Hi Selur,

Thank you very much for your help.

I did as follow and seems that ffmpeg is passing the commands without reporting errors. I couldn't test it in a real scenario yet

-filter_complex '[0:v]scale=1920:-1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2[video];[video][0:s:1]overlay[v]' -map [v] -map 0:a

What do you think?

Best,
Mapg