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• How to make TIME subtitles(.srt, .smi etc) with frame unit

  3 septembre 2019, par kylesong

  I want to create a Python script that make subtitle (a ticking timecode).

  I have an h.264 binary file that has timestamp in each frame. so I want to parse this timestamp and make the subtitle with it.

  Here’s what I’ve tried with ffmpeg below.

  ffmpeg -y -i video.avi -vf "drawtext=fontfile=C:\Windows\Fonts\consolab.ttf: fontsize=12:fontcolor=yellow: box=1:boxcolor=black@0.4: text='TIME\: %{pts\:gmtime\:1561939200}':x=(w-tw)/2:y=(h-th)/2" test.avi

  Output .avi is okay with the timestamp, but, I needed to re-encode the source video file which takes a lot of time.
  So, I want to use a different way, which is creating subtitles.

  Question is, is there any way to make subtitle with frame time ? or useful info to fill me in ?

  The current result :
  

  

  The expected result :
  

  

• How to put date and time in filename ? (FFmpeg)

  3 novembre 2017, par lys

  How to put data and time in an output file name generated from a video cut using ffmpeg ? I’ve tried some code combinations that did not work.

  This code works to cut the video but not the date and time :

  ffmpeg -s start -i input.mp4 -c copy -t 60 -strftime 1 -segment_format mp4 part_video% Y-% m-% d_% H-% M-% S.mp4

  I have an example working for my videos 24/7 and one for the "photos", but they are not applicable to the video.

  Example videos 24/7 :

  ffmpeg -f dshow -i video = camera -c: v libx264 -f segment -strftime 1 -segment_time 24:00:00 -segment_format mp4 -segment_format_options movflags = empty_moov my_video% Y-% m-% d_% H-% M- % S.mp4

  Example of photos :

  ffmpeg -f dshow -i video = camera -qscale: v 1 -t 1 -strftime 1 -segment_format jpeg photo% Y-% m-% d-% M-% S.jpeg

  Does anyone have an idea how to solve it ?

• Adding audio at specific time of the video

  21 septembre 2018, par Sergio Bruccoleri

  I want to add an audio file at a specific time of the video, without completely replacing the original video audio stream (just at the specific time, for the whole duration of the replacement audio).

  I have this command below :

  ffmpeg -y -i video.mp4 -itsoffset 00:00:07 -i audio.mp3 -map 0:0 -map 1:0 -c:v copy -async 1 out.mp4

  but this command replaces the entire audio stream of the video with the content of the second input

  The expected result is :

  • The video plays as normal with the original audio

  • Once timestamp 00:00:07 is reached, the new ’replaced’ audio streams
    play.

  • Once the new audio streams stops the original audio continues
    playing.

  Anyone that can help me solving this issue ? I’ve been trying with atrim without any result, but probably I am doing something wrong.