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• Trying to understand the ffmpeg seek cut functionality

  13 février 2020, par user3841429

  I have a video where I would like to cut a part from. The command I use :

  ffmpeg -ss 526.623 -t 347.986 -i 'example.mp4' -c copy -avoid_negative_ts 1 -y res.mp4

  Where expected length is 00:05:47.99. The process log shows the following :

  ...
  
  frame=10582 fps=8258 q=-1.0 Lsize= 1061446kB time=00:05:47.98 bitrate=24987.8kbits/s speed= 272x    
  
  video:1044531kB audio:16556kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.033789%

  As you can see time=00:05:47.98 as expected, but when I play this video in player I see that it has extra 5 seconds of video at the end. I check the playtime length :

  $ ffmpeg -i 'res.mp4' 2>&1 | grep Duration | cut -d ' ' -f 4 | sed s/,//
  
  00:05:53.11

  What the... My clue was the GOP’s I-frame, but when I modify my commands as :

  ffmpeg -ss 526.623 -t 347 -i 'example.mp4' -c copy -avoid_negative_ts 1 -y res.mp4

  Output shows time=00:05:46.99 and actual video length is 00:05:52.13

  In the first case it added 5.13sec, in the second 5.14. Let’s take 5.14 for both cases that show that it has nothing to do with I-frame. There is no magic in this world (I guess). But what then ?

  UPD : It is GOP in the begging of the video. For this video it’s about 7 seconds.

• ffmpeg drawtext Arabic fonts doesn't render correctly [closed]

  11 février 2024, par Mahmoud Abdellatief

  what i'm trying to achieve :
loop an image into a video and overlay Arabic Text from the Qur'an on it including the text diacritical mark, using a custom font.

  


  example of the text to be rendered :

  


  بِسْمِ ٱللَّهِ ٱلرَّحْمَـٰنِ ٱلرَّحِيمِ


  


  the font used :
https://fonts.qurancomplex.gov.sa/wp02/wp-content/uploads/2024/01/UthmanicHafs_v22.zip

  


  font's unicode module :

  


  Unicode Module 
 
The Research and Development Unit in the Computer Department at King Fahd Glorious Qur’an Printing Complex relied on the unicode system unicode to create (Hafs) font in the Uthmanic Script, because this system is followed globally among computer and systems manufacturing companies in the world.

Unicode organization is a global code group that is used to define all codes and letters used in most of the world's languages and gathered in one code to facilitate the presentation and delivery on information despite of the language used. This global coding uses 1 to 4 bytes (byte = 8 bits) to encode letters, and so far only a third of the number available in Unicode organization to encode the letters of these languages.

Taking into account Hafs font with the Uthmanic Script, which was built entirely on the unicode system. We can explore the basic letters that were formed according to the following figure:

Whereas the font was developed starting from code (0600 ) to code (066FF ) Taking into account there are several encoded letters that haven't been used at all so it was replaces with the code []. The displayed copy above is the one that is been developed from the basic Arabic coding (0600-06FF) which was updated by Unicode organization in 2009.


  


  expected result :
exported video with correctly rendered text using the given font.

  


  actual result :
the text rendered contains only the diacritical marks ( which are the accents on top of the letters ) without the actual letters.


  


  what i tried :
this is my test command which exports just an image for faster results :

  


  Ffmpeg -loop 1  -i "image-2.jpg" -vf "drawtext=text='بِسْمِ ٱللَّهِ ٱلرَّحْمَـٰنِ ٱلرَّحِيمِ':fontsize=124:fontcolor=white:fontfile='UthmanicHafsV22.ttf':x=(w-text_w)/2:y=(h-text_h)/2" -frames:v 1  "output.png"


  


  

  • tried adding ft_load_flags , almost tried all of them

  


  • tried text_shaping=1 , with no success

  


  • tried textfile instead of text

  


  • tried changing the font, any font i try with it always have different problems, either some squares instead of the diacritical mark

  


  


  p.s im having same results on both latest ffmpeg compiled by myself on macos terminal with all required libraries enabled , and also on flutter ffmpeg kit full gpl

  


• avcodec/motion_est : Attempt to fix "short data segment overflowed" on IA64

  15 janvier 2016, par Michael Niedermayer

  avcodec/motion_est : Attempt to fix "short data segment overflowed" on IA64
  This decreases the MV related encoding table sizes
  
  This should have little effect on real world video encoding performance
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/motion_est.h