Re: [FFmpeg-user] Alpha Channel QT with SubTitles

[Chris Davis]

Gandharv,

I have come up with the following example that behaves as you are expecting
it to.

ffmpeg -r 23.976 -loop 1 -i {path_to_alphaOnly_PNG} -t 30  -vf
subtitles="{path_to_srt}:*alpha=1*:force_style='Fontsize=18,BorderStyle=1,Outline=0,Shadow=1,MarginV=25,PrimaryColour=,FontName=Circular
Spotify Head'" -c:v prores_ks -profile:v 4 -pix_fmt yuva444p10 -y test.mov

The chief difference is the codec profile and the pix_format and the
"alpha=1" parameter in the subtitle filter.

Enjoy!
Chris Davis

On Tue, Feb 6, 2018 at 5:01 AM Gandharv Bhagat  wrote:

> hey Carl,
>
>
> I generated the test file and no subs are rendered from the subs2.mov
> file. I see the test pattern/colorbars/clock.  Instead of using a
> transparent PNG, could I instead generate an alpha channel 1920x1080 canvas
> directly from ffmpeg? I wonder if my PNG file is causing the issue?
>
>
> Gandharv
>
>
> p.s. When I say I see nothing, I mean its a black image with no text.
>
> 
> From: ffmpeg-user  on behalf of Carl
> Eugen Hoyos 
> Sent: Monday, February 5, 2018 7:26:37 AM
> To: FFmpeg user questions
> Subject: Re: [FFmpeg-user] Alpha Channel QT with SubTitles
>
> 2018-01-17 17:34 GMT+01:00 Gandharv Bhagat :
>
> > Thanks for the frame rate multiplier correction, will make the change.
> >
> > As for the file, I am checking in FCP 7. When alpha type is set to
> > ‘none/ignore’ I see a white background and white text and the drop
> > shadow. When the alpha type is set to ‘straight’, ‘black’, or ‘white’
> > I don’t see anything.
>
> I wonder how it is possible not to "see anything" on a video screen...
>
> The most relevant question from our point-of-view is if the following
> command (or a variant) indicates transparency in your video:
> $ ffmpeg -f lavfi -i testsrc=s=hd1080 -i Subs2.mov -filter_complex
> overlay -qscale 2 -vcodec mpeg4 out.mov
>
> The issue hitting you may be that a flag has to be set in the mov
> file or the video bitstream to indicate the type of the transparency.
>
> Please do not top-post here, Carl Eugen
> ___
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Re: [FFmpeg-user] Alpha Channel QT with SubTitles

[Gandharv Bhagat]

hey Carl,


I generated the test file and no subs are rendered from the subs2.mov file. I 
see the test pattern/colorbars/clock.  Instead of using a transparent PNG, 
could I instead generate an alpha channel 1920x1080 canvas directly from 
ffmpeg? I wonder if my PNG file is causing the issue?


Gandharv


p.s. When I say I see nothing, I mean its a black image with no text.


From: ffmpeg-user <ffmpeg-user-boun...@ffmpeg.org> on behalf of Carl Eugen 
Hoyos <ceffm...@gmail.com>
Sent: Monday, February 5, 2018 7:26:37 AM
To: FFmpeg user questions
Subject: Re: [FFmpeg-user] Alpha Channel QT with SubTitles

2018-01-17 17:34 GMT+01:00 Gandharv Bhagat <fra...@hotmail.com>:

> Thanks for the frame rate multiplier correction, will make the change.
>
> As for the file, I am checking in FCP 7. When alpha type is set to
> ‘none/ignore’ I see a white background and white text and the drop
> shadow. When the alpha type is set to ‘straight’, ‘black’, or ‘white’
> I don’t see anything.

I wonder how it is possible not to "see anything" on a video screen...

The most relevant question from our point-of-view is if the following
command (or a variant) indicates transparency in your video:
$ ffmpeg -f lavfi -i testsrc=s=hd1080 -i Subs2.mov -filter_complex
overlay -qscale 2 -vcodec mpeg4 out.mov

The issue hitting you may be that a flag has to be set in the mov
file or the video bitstream to indicate the type of the transparency.

Please do not top-post here, Carl Eugen
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Re: [FFmpeg-user] Alpha Channel QT with SubTitles

[Carl Eugen Hoyos]

2018-01-17 17:34 GMT+01:00 Gandharv Bhagat :

> Thanks for the frame rate multiplier correction, will make the change.
>
> As for the file, I am checking in FCP 7. When alpha type is set to
> ‘none/ignore’ I see a white background and white text and the drop
> shadow. When the alpha type is set to ‘straight’, ‘black’, or ‘white’
> I don’t see anything.

I wonder how it is possible not to "see anything" on a video screen...

The most relevant question from our point-of-view is if the following
command (or a variant) indicates transparency in your video:
$ ffmpeg -f lavfi -i testsrc=s=hd1080 -i Subs2.mov -filter_complex
overlay -qscale 2 -vcodec mpeg4 out.mov

The issue hitting you may be that a flag has to be set in the mov
file or the video bitstream to indicate the type of the transparency.

Please do not top-post here, Carl Eugen
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Re: [FFmpeg-user] Alpha Channel QT with SubTitles

[Gandharv Bhagat]

hi Carl,

Any update on this will be useful. I am also curious why the font size is not 
absolute, at it seems to change the size depending on the png size. the size 18 
font renders as different size if the PNG size is not full 1920x1080.

Cheers
Gandharv

From: ffmpeg-user <ffmpeg-user-boun...@ffmpeg.org> on behalf of Gandharv Bhagat 
<fra...@hotmail.com>
Sent: Wednesday, January 17, 2018 11:34 AM
To: FFmpeg user questions
Subject: Re: [FFmpeg-user] Alpha Channel QT with SubTitles

Carl,

Thanks for the frame rate multiplier correction, will make the change.

As for the file, I am checking in FCP 7. When alpha type is set to 
‘none/ignore’ I see a white background and white text and the drop shadow. When 
the alpha type is set to ‘straight’, ‘black’, or ‘white’ I don’t see anything.

Perhaps I need to give the subtitles a color ?

Gandharv

> On Jan 17, 2018, at 06:34, Carl Eugen Hoyos <ceffm...@gmail.com> wrote:
>
> 2018-01-11 22:42 GMT+01:00 Gandharv Bhagat <fra...@hotmail.com>:
>
>> I am trying to generate an alpha channel QT, with Apple animation
>> codec, but the I get output has a white background.
>
> How do you test the background?
>
> The fact that there is a white background using media players
> (which in many cases do not support transparency) does not
> necessary mean no transparency was encoded.
>
>> here is the command
>>
>> ffmpeg -r 23.976 -loop 1 -i Alpha_1920x1080.png
>
> Unrelated:
> Should be "-r 24000/1001"
>
> Carl Eugen
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Re: [FFmpeg-user] Alpha Channel QT with SubTitles

[Gandharv Bhagat]

Carl,

Thanks for the frame rate multiplier correction, will make the change.

As for the file, I am checking in FCP 7. When alpha type is set to 
‘none/ignore’ I see a white background and white text and the drop shadow. When 
the alpha type is set to ‘straight’, ‘black’, or ‘white’ I don’t see anything.

Perhaps I need to give the subtitles a color ?

Gandharv 

> On Jan 17, 2018, at 06:34, Carl Eugen Hoyos  wrote:
> 
> 2018-01-11 22:42 GMT+01:00 Gandharv Bhagat :
> 
>> I am trying to generate an alpha channel QT, with Apple animation
>> codec, but the I get output has a white background.
> 
> How do you test the background?
> 
> The fact that there is a white background using media players
> (which in many cases do not support transparency) does not
> necessary mean no transparency was encoded.
> 
>> here is the command
>> 
>> ffmpeg -r 23.976 -loop 1 -i Alpha_1920x1080.png
> 
> Unrelated:
> Should be "-r 24000/1001"
> 
> Carl Eugen
> ___
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Re: [FFmpeg-user] Alpha Channel QT with SubTitles

[Carl Eugen Hoyos]

2018-01-11 22:42 GMT+01:00 Gandharv Bhagat :

> I am trying to generate an alpha channel QT, with Apple animation
> codec, but the I get output has a white background.

How do you test the background?

The fact that there is a white background using media players
(which in many cases do not support transparency) does not
necessary mean no transparency was encoded.

> here is the command
>
> ffmpeg -r 23.976 -loop 1 -i Alpha_1920x1080.png

Unrelated:
Should be "-r 24000/1001"

Carl Eugen
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Re: [FFmpeg-user] Alpha Channel QT with SubTitles

[Gandharv Bhagat]

; Conversion failed!
> 
> MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$
> 
> MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$
> 
> MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$
> 
> MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$
> 
> MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$
> 
> MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$
> 
> MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$
> 
> MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$ ffmpeg -r 23.976 -loop 1 -i 
> /Users/Gandharv.Bhagat.PFT/Desktop/Alpha_1920x1080.png -c:v qtrle -t 
> 00:00:30.000 -vf 
> subtitles="/Users/Gandharv.Bhagat.PFT/Desktop/Subtitle.srt:force_style='Fontsize=18,BorderStyle=1,Outline=0,Shadow=1,MarginV=25,FontName=Arial'"
>  Subs2.mov
> 
> ffmpeg version 3.3.3-tessus Copyright (c) 2000-2017 the FFmpeg developers
> 
>  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
> 
>  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg 
> --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl 
> --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm 
> --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb 
> --enable-libopencore-amrwb --enable-libopus --enable-libsnappy 
> --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab 
> --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx 
> --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs 
> --enable-libxvid --enable-libzmq --enable-libzvbi --enable-version3 
> --disable-ffplay --disable-indev=qtkit
> 
>  libavutil  55. 58.100 / 55. 58.100
> 
>  libavcodec 57. 89.100 / 57. 89.100
> 
>  libavformat57. 71.100 / 57. 71.100
> 
>  libavdevice57.  6.100 / 57.  6.100
> 
>  libavfilter 6. 82.100 /  6. 82.100
> 
>  libswscale  4.  6.100 /  4.  6.100
> 
>  libswresample   2.  7.100 /  2.  7.100
> 
>  libpostproc54.  5.100 / 54.  5.100
> 
> [png_pipe @ 0x7faf9500] Stream #0: not enough frames to estimate rate; 
> consider increasing probesize
> 
> Input #0, png_pipe, from 
> '/Users/Gandharv.Bhagat.PFT/Desktop/Alpha_1920x1080.png':
> 
>  Duration: N/A, bitrate: N/A
> 
>Stream #0:0: Video: png, rgba(pc), 1920x1080 [SAR 2835:2835 DAR 16:9], 25 
> tbr, 25 tbn, 25 tbc
> 
> File 'Subs2.mov' already exists. Overwrite ? [y/N] n
> 
> Not overwriting - exiting
> 
> MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$ clear
> 
> 
> MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$ ffmpeg -r 23.976 -loop 1 -i 
> /Users/Gandharv.Bhagat.PFT/Desktop/Alpha_1920x1080.png -c:v qtrle -t 
> 00:00:30.000 -vf 
> subtitles="/Users/Gandharv.Bhagat.PFT/Desktop/Subtitle.srt:force_style='Fontsize=18,BorderStyle=1,Outline=0,Shadow=1,MarginV=25,FontName=Arial'"
>  Subs2.mov
> 
> ffmpeg version 3.3.3-tessus Copyright (c) 2000-2017 the FFmpeg developers
> 
>  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
> 
>  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg 
> --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl 
> --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm 
> --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb 
> --enable-libopencore-amrwb --enable-libopus --enable-libsnappy 
> --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab 
> --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx 
> --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs 
> --enable-libxvid --enable-libzmq --enable-libzvbi --enable-version3 
> --disable-ffplay --disable-indev=qtkit
> 
>  libavutil  55. 58.100 / 55. 58.100
> 
>  libavcodec 57. 89.100 / 57. 89.100
> 
>  libavformat57. 71.100 / 57. 71.100
> 
>  libavdevice57.  6.100 / 57.  6.100
> 
>  libavfilter 6. 82.100 /  6. 82.100
> 
>  libswscale  4.  6.100 /  4.  6.100
> 
>  libswresample   2.  7.100 /  2.  7.100
> 
>  libpostproc54.  5.100 / 54.  5.100
> 
> [png_pipe @ 0x7f81dc80] Stream #0: not enough frames to estimate rate; 
> consider increasing probesize
> 
> Input #0, png_pipe, from 
> '/Users/Gandharv.Bhagat.PFT/Desktop/Alpha_1920x1080.png':
> 
>  Duration: N/A, bitrate: N/A
> 
>Stream #0:0: Video: png, rgba(pc), 1920x1080 [SAR 2835:2835 DAR 16:9], 25 
> tbr, 25 tbn, 25 tbc
> 
> Stream mapping:
> 
>  Stream #0:0 -> #0:0 (png (native) -> qtrle (native))
> 
> Press [q] to stop, [?] for help
> 
> [Parsed_subtitles_0 @ 0x7f81dbd0] Shaper: FriBidi 0.19.2 (SIMPLE)
> 
> [Parsed_subtitles_0 @ 0x7f81dbd0] Using font provider coretext
> 
> Output #0, mov, to 'Subs2.mov':
> 
>  Metadata:
> 
>encoder : Lavf57.71.100
> 
>S

Re: [FFmpeg-user] Alpha Channel QT with SubTitles

[Gandharv Bhagat]

gpl 
--enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm 
--enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb 
--enable-libopencore-amrwb --enable-libopus --enable-libsnappy --enable-libsoxr 
--enable-libspeex --enable-libtheora --enable-libvidstab 
--enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack 
--enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid 
--enable-libzmq --enable-libzvbi --enable-version3 --disable-ffplay 
--disable-indev=qtkit

  libavutil  55. 58.100 / 55. 58.100

  libavcodec 57. 89.100 / 57. 89.100

  libavformat57. 71.100 / 57. 71.100

  libavdevice57.  6.100 / 57.  6.100

  libavfilter 6. 82.100 /  6. 82.100

  libswscale  4.  6.100 /  4.  6.100

  libswresample   2.  7.100 /  2.  7.100

  libpostproc54.  5.100 / 54.  5.100

[png_pipe @ 0x7faf9500] Stream #0: not enough frames to estimate rate; 
consider increasing probesize

Input #0, png_pipe, from 
'/Users/Gandharv.Bhagat.PFT/Desktop/Alpha_1920x1080.png':

  Duration: N/A, bitrate: N/A

Stream #0:0: Video: png, rgba(pc), 1920x1080 [SAR 2835:2835 DAR 16:9], 25 
tbr, 25 tbn, 25 tbc

File 'Subs2.mov' already exists. Overwrite ? [y/N] n

Not overwriting - exiting

MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$ clear


MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$ ffmpeg -r 23.976 -loop 1 -i 
/Users/Gandharv.Bhagat.PFT/Desktop/Alpha_1920x1080.png -c:v qtrle -t 
00:00:30.000 -vf 
subtitles="/Users/Gandharv.Bhagat.PFT/Desktop/Subtitle.srt:force_style='Fontsize=18,BorderStyle=1,Outline=0,Shadow=1,MarginV=25,FontName=Arial'"
 Subs2.mov

ffmpeg version 3.3.3-tessus Copyright (c) 2000-2017 the FFmpeg developers

  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)

  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg 
--extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl 
--enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm 
--enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb 
--enable-libopencore-amrwb --enable-libopus --enable-libsnappy --enable-libsoxr 
--enable-libspeex --enable-libtheora --enable-libvidstab 
--enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack 
--enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid 
--enable-libzmq --enable-libzvbi --enable-version3 --disable-ffplay 
--disable-indev=qtkit

  libavutil  55. 58.100 / 55. 58.100

  libavcodec 57. 89.100 / 57. 89.100

  libavformat57. 71.100 / 57. 71.100

  libavdevice57.  6.100 / 57.  6.100

  libavfilter 6. 82.100 /  6. 82.100

  libswscale  4.  6.100 /  4.  6.100

  libswresample   2.  7.100 /  2.  7.100

  libpostproc54.  5.100 / 54.  5.100

[png_pipe @ 0x7f81dc80] Stream #0: not enough frames to estimate rate; 
consider increasing probesize

Input #0, png_pipe, from 
'/Users/Gandharv.Bhagat.PFT/Desktop/Alpha_1920x1080.png':

  Duration: N/A, bitrate: N/A

Stream #0:0: Video: png, rgba(pc), 1920x1080 [SAR 2835:2835 DAR 16:9], 25 
tbr, 25 tbn, 25 tbc

Stream mapping:

  Stream #0:0 -> #0:0 (png (native) -> qtrle (native))

Press [q] to stop, [?] for help

[Parsed_subtitles_0 @ 0x7f81dbd0] Shaper: FriBidi 0.19.2 (SIMPLE)

[Parsed_subtitles_0 @ 0x7f81dbd0] Using font provider coretext

Output #0, mov, to 'Subs2.mov':

  Metadata:

encoder : Lavf57.71.100

Stream #0:0: Video: qtrle (rle  / 0x20656C72), argb, 1920x1080 [SAR 1:1 DAR 
16:9], q=2-31, 200 kb/s, 23.98 fps, 11988 tbn, 23.98 tbc

Metadata:

  encoder : Lavc57.89.100 qtrle

[Parsed_subtitles_0 @ 0x7f81dbd0] fontselect: (Arial, 400, 0) -> 
/Library/Fonts/Arial.ttf, -1, ArialMT

frame=  719 fps= 63 q=-0.0 Lsize=7461kB time=00:00:29.94 
bitrate=2041.0kbits/s speed=2.61x

video:7457kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing 
overhead: 0.051884%

MacBook-Pro-2:Desktop Gandharv.Bhagat.PFT$





From: ffmpeg-user <ffmpeg-user-boun...@ffmpeg.org> on behalf of Moritz Barsnick 
<barsn...@gmx.net>
Sent: Thursday, January 11, 2018 5:14 PM
To: FFmpeg user discussions
Subject: Re: [FFmpeg-user] Alpha Channel QT with SubTitles

On Thu, Jan 11, 2018 at 21:42:45 +, Gandharv Bhagat wrote:
> I am trying to generate an alpha channel QT, with Apple animation codec, but 
> the I get output has a white background. here is the command
>
> ffmpeg -r 23.976 -loop 1 -i Alpha_1920x1080.png -c:v qtrle -t 00:00:30.000 
> -vf 
> subtitles=“Subtitle.srt:force_style='Fontsize=18,BorderStyle=1,Outline=0,Shadow=1,MarginV=25,FontName=Arial'"
>  Subs2.mov

First and foremost, please provide the complete, uncut console output
of your command.

Moritz
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Re: [FFmpeg-user] Alpha Channel QT with SubTitles

[Moritz Barsnick]

On Thu, Jan 11, 2018 at 21:42:45 +, Gandharv Bhagat wrote:
> I am trying to generate an alpha channel QT, with Apple animation codec, but 
> the I get output has a white background. here is the command
> 
> ffmpeg -r 23.976 -loop 1 -i Alpha_1920x1080.png -c:v qtrle -t 00:00:30.000 
> -vf 
> subtitles=“Subtitle.srt:force_style='Fontsize=18,BorderStyle=1,Outline=0,Shadow=1,MarginV=25,FontName=Arial'"
>  Subs2.mov

First and foremost, please provide the complete, uncut console output
of your command.

Moritz
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[FFmpeg-user] Alpha Channel QT with SubTitles

[Gandharv Bhagat]

Hi,

I am trying to generate an alpha channel QT, with Apple animation codec, but 
the I get output has a white background. here is the command

ffmpeg -r 23.976 -loop 1 -i Alpha_1920x1080.png -c:v qtrle -t 00:00:30.000 -vf 
subtitles=“Subtitle.srt:force_style='Fontsize=18,BorderStyle=1,Outline=0,Shadow=1,MarginV=25,FontName=Arial'"
 Subs2.mov

Gandharv

p.s. The PNG was created in Photoshop
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