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• I want to get subtitles of images with CLI

  30 avril 2018, par user3387068

  I have movie data that BD has riped, with subtitles inside.
  Just that subtitle is saved as an image.
  So I’d like to get that subtitle image with CLI.
  Is there a good tool ?

  I will also post movie information from ffmpeg.

  Stream #0:0: Audio: flac, 48000 Hz, stereo, s32 (24 bit) (default)
  
  Stream #0:1: Subtitle: hdmv_pgs_subtitle (default)
  
  Stream #0:2: Subtitle: hdmv_pgs_subtitle

• Concatenating video clip with static image causes buffer errors

  16 février 2020, par jgaeb

  I’m trying to concatenate a 15 second clip of a video (MOVIE.mp4) with 5 seconds (no audio) of an image (IMAGE.jpg) using FFmpeg.

  Something seems to be wrong with my filtergraph, although I’m unable to determine what. The command I’ve put together is the following :

  ffmpeg \
  
  -loop 1 -t 5 -I IMAGE.jpg \
  
  -t 15 -I MOVIE.mp4 \
  
  -filter_complex "[0:v]scale=480:640[1_v];anullsrc[1_a];[1:v][1:a][1_v][1_a]concat=n=2:v=1:a=1[out]" \
  
  -map "[out]" \
  
  -strict experimental tst_full.mp4

  Unfortunately, this seems to be creating some strange results :

  1. On my personal computer (FFmpeg 4.2.1) it correctly concatenates the movie with the static image ; however, the static image lasts for an unbounded length of time. (After entering ctrl-C, the movie is still viewable, but is of an extremely long length—e.g., 35 min—depending on when I interrupt the process.)

  2. On a remote machine where I need to do the ultimate video processing (FFmpeg 2.8.15-0ubuntu0.16.04.1), the command does not terminate, and instead, I get cascading errors of the following form :

  Past duration 0.611458 too large
  
  ...
  
  [output stream 0:0 @ 0x21135a0] 100 buffers queued in output stream 0:0, something may be wrong.
  
  ...
  
  [output stream 0:0 @ 0x21135a0] 100000 buffers queued in output stream 0:0, something may be wrong.

  I haven’t been able to find much documentation that elucidates what these errors mean, so I don’t know what’s going wrong.

• Cutting the videos based on start and end time using ffmpeg

  13 avril 2017, par Kalai

  I tried to cut the video using the start and end time of the video by using the following command

  ffmpeg -ss 00:00:03 -t 00:00:08 -i movie.mp4 -acodec copy -vcodec copy -async 1 cut.mp4

  By using the above command i want to cut the video from 00:00:03 to 00:00:08. But it is not cutting the video between those times instead of that it is cutting the video with first 11 seconds. can anyone help me how resolve this ?

  Edit 1 :

  I have tried to cut by using the following command which is suggested by mark4o

  ffmpeg -i movie.mp4 -ss 00:00:03 -t 00:00:08 -async 1 cut.mp4

  But it was shown the following error.

  the encoder ’aac’ is experimental but experimental codecs are not enabled

  so i added the -strict -2 into the command i.e.,

  ffmpeg -i movie.mp4 -ss 00:00:03 -t 00:00:08 -async 1 -strict -2 cut.mp4

  Now it is working fine.