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• I have 22,1 GB of movie data totally that I want to put on several DVDs

  8 mars 2017, par P. Dee

  I have 22,1 GB of movie data totally that I want to put on several DVDs.

  I want ffmpeg to create one long 22.1 GB mp4 file from a lot of small files to then split them into as many 4.7 GB mp4-files as necessary(should fit on 5 DVDs), so the order is preserved.

  Which command do I need ?

  I started with ffmpeg -f concat -safe 0 -i mylist.txt -c copy -fs 5046586573 output1.mp4 with mylist.txt containing

  # this is a comment
  
  file '/path/to/file1'
  
  file '/path/to/file2'
  
  file '/path/to/file3'

  Then looking at the duration, to then continue with ffmpeg -ss duration -f concat -safe 0 -i mylist.txt -c copy -fs 5046586573 output2.mp4

  Which command does that at once ?

• Font Size Mismatch When Using Fallback Fonts in FFmpeg ASS Subtitles

  6 janvier, par Mostafa Fathi

  I’m facing an issue with font size mismatch in ASS subtitles rendered by FFmpeg when combining English text with Arabic or Persian characters.

  


  Steps to Reproduce :

  


  1.Subtitle File :
Here’s an example of the ASS subtitle file :

  


  [Script Info]
Title: Generated ASS
ScriptType: v4.00+
WrapStyle: 2
ScaledBorderAndShadow: yes
YCbCr Matrix: none
PlayResX: 1920
PlayResY: 1080

[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default, ABeeZee, 40, &H00FFFFFF, &H000000FF, &H00000000, &H00000000, -1, 0, 0, 0, 100, 100, 0, 0, 1, 1, 0, 2, 10, 10, 10, 1

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:01.00,0:00:05.00,Default,,0,0,0,,Hello! This is English text.
Dialogue: 0,0:00:05.00,0:00:10.00,Default,,0,0,0,,سلام! This is mixed Arabic/English text.


  


  

  2. Command Used :

  


  


  ffmpeg -i input.mp4 -vf "ass=subtitle.ass" output.mp4


  


  

  3. Screenshots :
Below are two screenshots of the issue :

  


  


  • Text rendered with the main font (ABeeZee) is correct.

  


  

  


  • Text rendered with the fallback font (Cinema) appears larger/smaller in size.

  


  

  


  

  5. Debug Logs :

  


  


  [Parsed_ass_0 @ 0xb4000079f04f8210] libass API version: 0x1701000
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] libass source: commit: 0.17.1-0-ge8ad72accd3a84268275a9385beb701c9284e5b3
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] Shaper: FriBidi 1.0.13 (SIMPLE) HarfBuzz-ng 8.0.1 (COMPLEX)
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] Using font provider fontconfig
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] Added subtitle file: '/data/***/ass_file.ass' (4 styles, 29 events)
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] fontselect: (ABeeZee, 400, 0) -> /data/***/ABeeZee_regular.ttf, 0, ABeeZee-Regular
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] Glyph 0x633 not found, selecting one more font for (ABeeZee, 400, 0)
[Parsed_ass_0 @ 0xb4000079f04f8210] 
[Parsed_ass_0 @ 0xb4000079f04f8210] fontselect: (ABeeZee, 400, 0) -> /data/***/Cinema.ttf, 0, Cinema


  


  Question :

  


  How can I ensure that text rendered with fallback fonts has the same size as the main font ? Are there specific settings in FFmpeg or the ASS subtitle format that can address this issue ? Alternatively, is there a way to manually adjust the scaling of fallback fonts in FFmpeg ?

  


• Image processing in FFmpeg when playing a movie

  2 juillet 2016, par followait

  e.g. find car license plates and draw a bounding box for each plate
  Any easy way, or I’ve to do it myself ?
  Thanks.