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• ffmpeg conversion : 16:9 H.264 to MPG ; converts to 4:3, shows as 4:3 in QT X player, 16:9 in VLC

  14 septembre 2015, par Wivku

  My source video file :

  Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 352x288 [SAR 16:11 DAR 16:9], 305 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc (default)

  My output video file :

  Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 352x288 [SAR 49:33 DAR 49:27], 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc

  Both seem to have correct SAR/DAR.

  But, when I play the original file in QuickTime Player X it is shown in 16:9 and the output file is shown in 4:3. The output file is shown correctly in VLC and... QuickTime Player 7. See screenshots.

  Q : Is there a specific tag/flag I need to set in the output file to mark it as 16:9 (for QT X) ?

  Related : I add a burnt in timecode, but this is burnt in on the 4:3 aspect ratio. In other words, when displaying in the correct 16:9 ratio the timecode is stretched horizontally.

  Q : How can I specify that the timecode should be added based on the 16:9 aspect ratio ?

  For the conversion (without the timecode burn) with ffmpeg 2.7.2, both of these give the same result :

  ffmpeg -y -i orig.mov -aspect 16:9 output.mpg
  
  ffmpeg -y -i orig.mov output.mpg

  
  
  
  

• Adding text to movie using ffmpeg

  23 août 2014, par microspace

  I use git to track *.ass subtitle files.
  Here is example of *.ass file :

  [Script Info]
  
  ; Script generated by Aegisub 3.1.2
  
  ; http://www.aegisub.org/
  
  Title: Default Aegisub file
  
  ScriptType: v4.00+
  
  
  
  [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,Arial,20,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,2,10,10,10,1
  
  Style: titr,DejaVu     
  
  
  
  Sans,20,&H007DDBFA,&H000000FF,&H00000000,&HFF000000,0,0,0,0,100,100,0,0,1,2,2,1,10,10,10,1
  
  
  
  [Events]
  
  Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
  
  Dialogue: 0,0:00:00.46,0:00:11.22,Default,,0,0,0,,Если это можно было бы
  
  Dialogue: 0,0:00:03.44,0:00:08.96,titr,,0,0,0,,{\pos(20,240)\fad(600,600)}бывший министр

  After commit I burn subtitles into video :

  ffmpeg -i video.avi -vf "ass=subtitle.ass" out.avi

  My goal is to show commit date for 10 second at the start of movie. This should be done automatically.

  1) It can be easily done with by modifying subtitle.ass itself, but I can’t do it after commit and there are other reasons.

  2) It can be done by ffmpeg from command line : How to use ffmpeg to add a text to avi video ?

  Problem is that in this case text will be shown for the whole lenght of movie.

  3) I can copy *.ass file to temporary directory, insert date, render and delete *.ass file.

  Is there a simpler way ?

• ffmpeg video is bugged when burning PGS subtitles from .mkv to .webm

  27 août 2022, par ahab1851

  I am trying to burn PGS subtitles into a WebM clip (I am converting .mkv file with PGS subtitles into a .webm file), but when I do that, the clip becomes bugged : the length of the clip is 1193 hours and I can't seek the clip.

  


  Here's my ffmpeg command :

  


  ffmpeg -hide_banner -i out.mkv -sws_flags lanczos+accurate_rnd+full_chroma_int \
-filter_complex "[0:v][0:s]overlay[v1]; [v1]crop=1920:804:0:138, \
colorspace=bt709:iall=bt601-6-625:fast=1,scale=1280:-2[v2]" \
-map "[v2]" -map 0:1 -minrate 320k -maxrate 1300k -b:v 640k \
-pix_fmt yuv420p10le -colorspace 1 -color_range 1 -color_primaries 1 \
-color_trc 1 -tile-columns 0 -g 240 -aq-mode 0 -threads 2 \
-deadline good -crf 32 -c:v libvpx-vp9 -pass 1 -cpu-used 2 -row-mt 1 -an -sn -f webm -

ffmpeg -hide_banner -i out.mkv -sws_flags lanczos+accurate_rnd+full_chroma_int \
-filter_complex "[0:v][0:s]overlay[v1]; [v1]crop=1920:804:0:138, \
colorspace=bt709:iall=bt601-6-625:fast=1,scale=1280:-2[v2]" \
-map "[v2]" -map 0:1 -minrate 320k -maxrate 1300k -b:v 640k \
-pix_fmt yuv420p10le -color_range 1 -colorspace 1 -color_primaries 1 \
-color_trc 1 -tile-columns 0 -auto-alt-ref 1 -lag-in-frames 25 -g 240 \
-aq-mode 0 -threads 1 -deadline good -crf 32 -c:v libvpx-vp9 -pass 2 \
-cpu-used 0 -row-mt 1 -an -sn -map_metadata -1 -f webm output.webm


  


  Thanks.