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• FFMpeg embedding .srt file into hls stream playlist as WebVTT

  11 mai 2020, par user1503606

  I had an srt subtitle file see below.

  



  1
00:00:06,840 --> 00:00:10,320
once long ago in the deep blue below

2
00:00:12,360 --> 00:00:14,370
Don't be silly, Gran Mother

3
00:00:14,870 --> 00:00:16,700
Everybody knows there's no such thing as

4
00:00:16,700 --> 00:00:17,200
Mermaids

5
00:00:17,620 --> 00:00:21,570
You wouldn't say that if you has meet one. You've meet a Mermaid

6
00:00:24,250 --> 00:00:25,180
This just came in

7
00:00:25,480 --> 00:00:26,630
I wanted to take priority

8
00:00:27,180 --> 00:00:28,500
And we followed stories like this before

9
00:00:28,640 --> 00:00:31,620
Would witches working mummies. No not like this

10
00:00:31,630 --> 00:00:33,190
Hundreds of people are testifying

11
00:00:33,370 --> 00:00:34,600
Welcome to Mississippi

12
00:00:42,390 --> 00:00:47,270
There's a powerful magic in you the spirit of the ocean

13
00:00:47,690 --> 00:00:53,940
Let me introduce you to your dreams, The Little Mermaid, off the Mississippi

14
00:01:01,880 --> 00:01:03,580
She was so beautiful

15
00:01:04,040 --> 00:01:05,270
And I know she was real

16
00:01:07,850 --> 00:01:08,550
I'm skeptical

17
00:01:13,460 --> 00:01:14,410
You shouldn't be here

18
00:01:17,560 --> 00:01:24,130
Mermaids do not exist

19
00:01:31,420 --> 00:01:34,300
Look isn't it beautiful? Sorry I have to go.

20
00:01:35,340 --> 00:01:48,570
Elizabeth, How can this be? It's Lock he knows i'm here he summoned me.

21
00:01:48,570 --> 00:01:50,570
We have to save here.

22
00:02:03,570 --> 00:02:05,570
Here soul is mine

23
00:02:05,570 --> 00:02:06,570
Take it

24
00:02:10,570 --> 00:02:12,570
It's the only way

25
00:02:15,000 --> 00:02:17,570
I believe

26
00:02:23,000 --> 00:02:25,570
Mississippi has always been magic

27
00:02:36,000 --> 00:02:38,000
Elizabeth please


  



  If I use AWS Media convert to add this to my playlist it outputs the following.

  



  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:300
#EXT-X-MEDIA-SEQUENCE:1
#EXT-X-PLAYLIST-TYPE:VOD
#EXTINF:170,
masterCaptionsEnglish/English.vtt
#EXT-X-ENDLIST


  



  And the WebVTT file looks like this.

  



  WEBVTT  #Elemental Media Engine(TM) 2.16.0.602399
X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:191970

00:00:06.840 --> 00:00:10.320
once long ago in the deep blue below

00:00:12.360 --> 00:00:14.370
Don't be silly, Gran Mother

00:00:14.870 --> 00:00:16.700
Everybody knows there's no such thing as

00:00:16.700 --> 00:00:17.200
Mermaids

00:00:17.620 --> 00:00:21.570
You wouldn't say that if you has meet one. You've meet a Mermaid

00:00:24.250 --> 00:00:25.180
This just came in

00:00:25.480 --> 00:00:26.630
I wanted to take priority

00:00:27.180 --> 00:00:28.500
And we followed stories like this before

00:00:28.640 --> 00:00:31.620
Would witches working mummies. No not like this

00:00:31.630 --> 00:00:33.190
Hundreds of people are testifying

00:00:33.370 --> 00:00:34.600
Welcome to Mississippi

00:00:42.390 --> 00:00:47.270
There's a powerful magic in you the spirit of the ocean

00:00:47.690 --> 00:00:53.940
Let me introduce you to your dreams, The Little Mermaid, off the Mississippi

00:01:01.880 --> 00:01:03.580
She was so beautiful

00:01:04.040 --> 00:01:05.270
And I know she was real

00:01:07.850 --> 00:01:08.550
I'm skeptical

00:01:13.460 --> 00:01:14.410
You shouldn't be here

00:01:17.560 --> 00:01:24.130
Mermaids do not exist

00:01:31.420 --> 00:01:34.300
Look isn't it beautiful? Sorry I have to go.

00:01:35.340 --> 00:01:48.570
Elizabeth, How can this be? It's Lock he knows i'm here he summoned me.

00:01:48.570 --> 00:01:50.570
We have to save here.

00:02:03.570 --> 00:02:05.570
Here soul is mine

00:02:05.570 --> 00:02:06.570
Take it

00:02:10.570 --> 00:02:12.570
It's the only way

00:02:15.000 --> 00:02:17.570
I believe

00:02:23.000 --> 00:02:25.570
Mississippi has always been magic

00:02:36.000 --> 00:02:38.000
Elizabeth please


  



  I am trying to replicate this with FFMpeg. I have tried the following command.

  



  ffmpeg -i little-mermaid.mov -i little-mermaid.srt -c copy -c:s webvtt -start_number 0 -hls_time 10000 -f hls mermaid/Eng/master.m3u8


  



  This creates a WebVTT file but it is completely wrong and out of sync. See below.

  



  All the times have changed and it's removed the first two digits from each section.

  



  WEBVTT

00:06.882 --> 00:10.362
once long ago in the deep blue below

00:12.402 --> 00:14.412
Don't be silly, Gran Mother

00:14.912 --> 00:16.742
Everybody knows there's no such thing as

00:16.742 --> 00:17.242
Mermaids

00:00:17.620 -- 00:00:21.570
You wouldn't say that if you has meet one. You've meet a Mermaid

00:24.292 --> 00:25.222
This just came in

00:25.522 --> 00:26.672
I wanted to take priority

00:27.222 --> 00:28.542
And we followed stories like this before

00:28.682 --> 00:31.662
Would witches working mummies. No not like this

00:31.672 --> 00:33.232
Hundreds of people are testifying

00:33.412 --> 00:34.642
Welcome to Mississippi

00:42.432 --> 00:47.312
There's a powerful magic in you the spirit of the ocean

00:47.732 --> 00:53.982
Let me introduce you to your dreams, The Little Mermaid, off the Mississippi

01:01.922 --> 01:03.622
She was so beautiful

01:04.082 --> 01:05.312
And I know she was real

01:07.892 --> 01:08.592
I'm skeptical

01:13.502 --> 01:14.452
You shouldn't be here

01:17.602 --> 01:24.172
Mermaids do not exist

01:31.462 --> 01:34.342
Look isn't it beautiful? Sorry I have to go.

01:35.382 --> 01:48.612
Elizabeth, How can this be? It's Lock he knows i'm here he summoned me.

01:48.612 --> 01:50.612
We have to save here.

02:03.612 --> 02:05.612
Here soul is mine

02:05.612 --> 02:06.612
Take it

02:10.612 --> 02:12.612
It's the only way

02:15.042 --> 02:17.612
I believe

02:23.042 --> 02:25.612
Mississippi has always been magic

02:36.042 --> 02:38.042
Elizabeth please


  



  I am trying to decide if it just makes sense to convert the .srt to WebVTT and use that file without encoding with FFMPEG just create a .m3u8 file with -hls_flag single_file that points to it but not sure what implementation this might cause.

  



  Can anyone suggest how I could do this or where I might be going wrong ?

  



  Here is the video file I am using if anyone wants to run the FFMPEG command above to test.

  



  http://www.hd-trailers.net/movie/the-little-mermaid/

  



  Thanks

  


• Convert image sequence to video using ffmpeg and list of files

  13 juin 2020, par rensa

  I have a camera taking time-lapse shots every 2–3 seconds, and I keep a rolling record of a few days' worth. Because that's a lot of files, I keep them in subdirectories by day and hour :

  



  images/
    2015-05-02/
        00/
            2015-05-02-0000-02
            2015-05-02-0000-05
            2015-05-02-0000-07
        01/
            (etc.)
    2015-05-03/


  



  I'm writing a script to automatically upload a timelapse of the sunrise to YouTube each day. I can get the sunrise time from the web in advance, then go back after the sunrise and get a list of the files that were taken in that period using find :

  



  touch -d "$SUNRISE_START" sunrise-start.txt
touch -d "$SUNRISE_END" sunrise-end.txt
find images/"$TODAY" -type f -anewer sunrise-start.txt ! -anewer sunrise-end.txt


  



  Now I want to convert those files to a video with ffmpeg. Ideally I'd like to do this without making a copy of all the files (because we're talking 3.5 GB per hour of images), and I'd prefer not to rename them to something like image000n.jpg because other users may want to access the images. Copying the images is my fallback.

  



  But I'm getting stuck sending the results of find to ffmpeg. I understand that ffmpeg can expand wildcards internally, but I'm not sure that this is going to work where the files aren't all in one directory. I also see a few people using find's --exec option with ffmpeg to do batch conversions, but I'm not sure if this is going to work with image sequence input (as opposed to, say, converting 1000 images into 1000 single-frame videos).

  



  Any ideas on how I can connect the two—or, failing that, a better way to get files in a date range across several subdirectories into ffmpeg as an image sequence ?

  


• FFmpeg - center crop image overlay

  21 juillet 2020, par ClassA

  Here is the information about my input files, player and command I'm using :

  


  

  


  

  • Input Video Dimensions = 1080 x 1920

  


  • Input Image Dimensions (overlay - Red in image) = 1080 x 1794

  


  • Player dimensions (Black in image) = 1080 x 1794

  


  • Video size (scaled to fit in player - Blue in image) = 1010 x 1794

  


  


  My current command is :

  


  -ffmpeg -ss valueLeft -i inputVideo -i inputOverlay -t to -filter_complex scale=playerWidth:trunc(ow/a/2)*2,overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 -c:v libx264 -preset ultrafast outputPath


  


  The playerWidth is the width of the video, scaled to fit in the player (blue/video in the image above).

  


  ---

  


  The problem I have is that the video is scaled inside the player to fit inside the player, this means that I might have values like 999.

  


  To counter this, I can change the width to 998 or 1000, but the overlay image will be out by one pixel. I know one pixel is not a lot, but in my use case, it has to be precisely the same as it was in the player.

  


  Besides that, the video aspect ratio will also change when doing this.

  


  My question :

  


  How can I center crop the overlay, despite the size of the video or the overlay image, to get the following result :

  


  

  


  EDIT :
It would be great if I could instead use the video's original dimensions and crop the overlay (if it is bigger than the video).