Sur d’autres sites (7381)

• avformat/ty : Remove write-only array and variable

  11 août 2020, par Andreas Rheinhardt

  avformat/ty : Remove write-only array and variable
  Up until now, the TiVo demuxer parse an array of SEQ entries, yet it has
  
  never ever made any use of them. In fact, parse_master, the function
  
  parsing said table, only influenced the outside world in three ways : Via
  
  an excessive amount of error message in case a certain parameter is not
  
  what it expected ; via an allocation (the aforementioned write-only
  
  array) ; and by setting a certain parameter (ty->cur_chunk_pos), but that
  
  parameter is always overwritten before it is used (it is overwritten
  
  in get_chunk() on success and if get_chunk() fails, the error is
  
  returned to the caller anyway). So remove the array and the function
  
  used to parse it.
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/ty.c

• Creating marketing videos

  7 juin 2020, par Cengiz

  I am trying to create a marketing video with multiple images (png/jpg) after adding texts on every single image and of course with their duration. Therefor, I use several ffmpeg commands, because I am not able to do it with just one command.

  



  How can I define a text and a duration for every image before adding it to the video ?

  



  My example batch file :

  



   !/bin/bash

  



  echo "[Start]"
ffmpeg \
 -i '01.jpg' \
 -vf drawtext="\text='Stack Overflow' : fontcolor=white : fontsize=24 : box=1 : boxcolor=black@0.9 : boxborderw=5 : x=(w-text_w)/2 : y=(h-text_h)/2" \
 -codec:a copy \
 -y 'out-a.mp4'
ffmpeg \
 -i '02.jpg' \
 -vf drawtext="\text='Another Text' : fontcolor=white : fontsize=24 : box=1 : boxcolor=black@0.9 : boxborderw=5 : x=(w-text_w)/2 : y=(h-text_h)/2" \
 -codec:a copy \
 -y 'out-b.mp4'
ffmpeg \
 -i '03.jpg' \
 -vf drawtext="\text='Hello World' : fontcolor=white : fontsize=24 : box=1 : boxcolor=black@0.9 : boxborderw=5 : x=(w-text_w)/2 : y=(h-text_h)/2" \
 -codec:a copy \
 -y 'out-c.mp4'
ffmpeg \
 -i out-*.mp4 \
 -vf scale=768x420 \
 -c:v libx264 \
 -r 30 \
 -pix_fmt yuv420p \
 -y 'output.mp4'
echo "[End]"

  



  Thanks to all
Cengiz

  


• Does ffmpeg support clip feature in ass with subtitle filter ?

  14 mars 2019, par neonew

  I want to use clip/iclip feature in ASS with ffmpeg to display the subtitles one by one. Below is my ASS file content :

  [Script Info]  
  
  ScriptType: v4.00+  
  
  WrapStyle: 0  
  
  ScaledBorderAndShadow: yes  
  
  PlayResX: 1000  
  
  PlayResY: 560  
  
  [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,FZLanTingHei-R-GBK,24,&H000000,&H00FF0000,&H00000000,&H00000000,0,0,0,0,100,100,0,0,2,0,0,1,0,0,0,1  
  
  [Events]  
  
  Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text  
  
  Dialogue: 0,0:00:00.00,0:00:02.00,Default,,0000,0000,0000,,{\pos(717,91)\iclip(717,91,1000,191)\t(0,1000,\iclip(1000,91,1000,191))}Hello World!

  ffmpeg command :

  ffmpeg -i input.mp4 -filter_complex "subtitles=myass.ass" output.mp4

  However, the text just appeared two seconds, but didn’t have clip feature.
  So, is there something wrong ?