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• Issues with adding the current timestamp of a video when using FFPLAY

  28 janvier 2023, par lalelarsen1

  Hi i am trying to add to display the current time of the video as an overlay. i have tried to do follow the answer of this previous post : https://superuser.com/questions/968685/how-to-display-current-time-with-the-ffplay-exe but with no luck.

  


  This is my line of code :

  


  "./ffmpeg-2023-01-25-git-2c3107c3e9-full_build/bin/ffplay.exe" -vf "drawtext=fontfile=./consola.ttf:text='%{pts:hms}':fontsize=48:fontcolor=white:box=1:boxborderw=6:boxcolor=black@0.75:x=(w-text_w)/2:y=h-text_h-20" -i "%shadowplays_folder%\%NEWEST_FOLDER%\%NEWEST_FILE%" -autoexit -x "1000" -alwaysontop


  


  This will display the text "hms}" not the time.

  


  the above code works fine if i replace it with a simple string :

  


  "./ffmpeg-2023-01-25-git-2c3107c3e9-full_build/bin/ffplay.exe" -vf "drawtext=fontfile=./consola.ttf:text='test':fontsize=48:fontcolor=white:box=1:boxborderw=6:boxcolor=black@0.75:x=(w-text_w)/2:y=h-text_h-20" -i "%shadowplays_folder%\%NEWEST_FOLDER%\%NEWEST_FILE%" -autoexit -x "1000" -alwaysontop


  


  This will display the text "test"

  


  what am i missing ?

  


• ffmpeg live stream overlay issues,while any one of the stream is lost other streams are getting stuck

  29 mars 2013, par Samy

  So far we have done

  We have a video chat client which has a set of 9 video streams (users) with
  h.264 codec using Adobe FMS. Now, using ffmpeg we are able to combine these
  streams into one stream using the overlay (video) and amix (audio) filters.
  We are able to send the single combined stream to a live streaming service.
  The stream of the active speaker is shown in a bigger size using the scale
  property of ffmpeg.

  Code as follows :

  ffmpeg -i "rtmp://localhost/live/mystream" -i "rtmp://localhost/live/mystream2 " -i "rtmp://localhost/live/mystream3 "-filter_complex"nullsrc=size=300x300 [b1];[0:v] setpts=PTS-STARTPTS,scale=100x100 [s1];[1:v] setpts=PTS-STARTPTS,scale=200x200 [s2];[2:v]setpts=PTS-STARTPTS,scale=100x100 [s3];[b1][s1] overlay=shortest=1 [b1+s1];[b1+s1][s2] overlay=shortest=1 [b1+s2];
  
  [b1+s2][s3] overlay=shortest=1:x=100" out.mp4

  Help Needed in the following 2 major issues. Any help would be appreciated.

  1. Whenever the active speaker changes, the stream of that user should be shown in a bigger
     size. is this possible to do without restarting the ffmpeg process ?

  2. Right now, if one of the 9 streams stops, the ffmpeg process crashes.

• Having issues parsing cropdetect values from ffmpeg in batch script

  23 mars 2024, par Alex Sadler

  I have this script that I'm trying to write that finds video files in a dir, automatically removes black bars and transcodes to x265...

  


  @echo off
setlocal enabledelayedexpansion

REM Loop through all video files in the current directory
for %%F in (*.mp4, *.avi, *.mkv, *.ts) do (
    echo Processing "%%F"

    REM Use FFMPEG to detect crop values
    for /f "tokens=*" %%a in ('ffmpeg -i "%%F" -vf "cropdetect" -f null - 2^>^&1 ^| find /i "crop="') do (
        set cropfilter=%%a
    )

    REM Extract the crop filter result
    set cropfilter=!cropfilter:*crop=! 
    set cropfilter=!cropfilter: =!

    REM Use the detected crop filter to crop the video
    if not "!cropfilter!"=="" (
        echo Detected crop filter: !cropfilter!
        ffmpeg -i "%%F" -map 0:v:0 -map 0:a:0 -map 0:s? -c:v:0 libx265 -crf 18 -vf "crop=!cropfilter!" -c:a:0 aac -ac 2 -b:a:0 256k -c:a:1 aac -ac 6 -b:a:1 512k -c:s copy "encoded.mkv"
    ) else (
        echo No cropping needed for "%%F".
    )
)

echo Processing complete.
pause


  


  I'm struggling to correctly parse the crop values output from the initial ffmpeg query though. What its grabbing at the moment is :

  


  detect_0@000001ce4b0e2040]x1:0x2:1919y1:131y2:948w:1920h:816x:0y:132pts:625483604t:6949.817822limit:0.094118crop=1920:816:0:132


  


  When I really just need this bit :

  


  crop=1920:816:0:132


  


  So that I can call it in the transcode command.

  


  Thanks in advance.