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• Trouble automating concatination (merging) of VOB files from DVD with FFMPEG

  2 juillet 2020, par Randy

  I have a library of decrypted DVDs, which all have their video in a series of VOB files within the usual VIDEO_TS folder. I wondered if I could use FFMPEG to combine them into a single MPEG files. So first I found this (this assumes 2 VOB files) from an old non-stack exchange post, and it works...

  


  ffmpeg -i "concat:VTS_01_1.VOB|VTS_01_2.VOB" -f DVD 


  


  ffmpeg complains sometimes about possible missing timestamps, but I've not seen any issues in the video, audio, or synchronization. This works too with slightly different complaints

  


  ffmpeg -i "concat:VTS_01_1.VOB|VTS_01_2.VOB" -f mpeg -c copy output.mpeg


  


  So what I'd like to do is make a windows (1) batch file to create the "concat" string, after analyzing a TS_VIDEO directory. Well as it turns out, putting a "|" character in a string is a tall order. (even escaping it doesn't works as expected.) So I looked up the ffmpeg docs on the "concat" subject, and they suggest using a list of files stored in a text file, like this...

  


  file 'VTS_01_1.VOB'
file 'VTS_01_2.VOB' (etc...)

  


  Then using a call to FFMPEG like this...

  


  ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mpg


  


  Well I tried that and it didn't work very well. After the first VOB file, I was getting continuous warnings about buffer underflow and time stamps, and the usually fast concatenation process slowed to a creep. Warnings typically looked like this...

  


  


  [mpeg @ 00000185e32b4200] buffer underflow st=1 bufi=1466 size=1998

  


  [mpeg @ 00000185e32b4200] Non-monotonous DTS in output stream 0:1 ;
previous : 328415794, current : 9265348 ; changing to 328415795. This may
result in incorrect timestamps in the output file.

  


  


  So can anyone suggest a method that WORKS as well as my first example, but taking the list of files from an input text file ?

  


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  6 juillet 2020, par sarahlburke58

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  Title : My Hero Academia : Heroes Rising
Release : 2019-12-20
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• Creating MOV from PNGs with ffmpeg : playback issue in older quicktime (7.6.6)

  15 avril 2013, par Jim Lindstrom

  I'm using ffmpeg to create a MOV file from a series of images. When I view the movie in Quicktime 7.7.x, it looks great (left image). When I view in Quicktime 7.6.6 I get this weird issue (on the right) :

  
  

  Any idea even what this is, much less how to fix it ?

  Details

  My source images are a mix of PNGs and JPGs that I pre-process with ImageMagick (to draw text, captions, etc). I store intermediate results as MPCs, and final frames as PNMs.

  To draw the above frame, I'm doing this :

  convert -background none -fill white -font my_font.ttf -pointsize 132 -gravity \
  
          center -size 945x550 caption:"Stills Demo" background-template.png     \
  
          +swap -composite -resize 1920x1080! /tmp/title_screen4338355.png
  
  convert -auto-orient /tmp/title_screen4338355.png -resize 100% -type TrueColor \
  
          /tmp/1b2764754ce6e420986ed74b942bcf67.mpc
  
  convert /tmp/1b2764754ce6e420986ed74b942bcf67.mpc -set option:distort:viewport \
  
          1920x1080+0+0  +distort SRT '960.0,540.0 1.0 0 960.0,540.0'            \
  
          /tmp/stills-project-6224/video_frames/img_0000.pnm

  I render frames with ffmpeg like so :

  ffmpeg -y -f image2 -i /tmp/stills-project-6224/video_frames/img_%04d.pnm      \
  
         -i /tmp/soundtrack_8702693.wav -vcodec libx264 -pix_fmt yuvj444p        \
  
         -b:v 2200k  -r 25 -strict experimental                                  \
  
         /tmp/stills-project-6224/video_rendered/output.mov

  The rest of the video is fine. The other images are photos (jpgs or pngs) that I process in the same way. I have also noticed that if I don't apply text to this background-template, the image shows up fine, so I think the issue has something to do with either how I'm processing or saving that image.