Sur d’autres sites (12048)

• FFmpeg command to apply multiple filters and limit the final file size

  16 mars 2016, par Konrad — ffmpeg

  I’m using ffmpeg command below to convert video to a format of the defined scale and in order to hardcode the subtitles

  Original syntax

  ffmpeg -i "Original File.mov"  -vf subtitles=Subtitles.srt -vf scale=1920:1080 \
  
         -crf 12 "Final File".mov

  Problem

  I would like to expand this command further and :

  • ensure that the produce file is under 2GB
  • I would like to include additional parameters with advanced subtitle options, like setting the canvas size and fixing the potential delay

  Side notes

  I reckon that in case of predefining the file size the -crf 12 paramater will be redundant ?

• Apply a trim on the output of filter_complex ?

  8 décembre 2023, par PirateApp

  I have a filter complex expression that takes 4 input videos and combines them in 4 corners of the screen synced at a particular start time from each video

  


  ffmpeg \
    -i first_vid.mkv \
    -i second_vid.mp4 \
    -i third_vid.mkv \
    -i fourth_vid.mkv  \
    -filter_complex \
        "nullsrc=size=1280x720 [base]; \
        [0:v] \
            trim=start=40,\
            setpts=PTS-STARTPTS,\
            scale=640x360,\
            drawtext=fontfile=/Users/vr/Downloads/gameplay_vids/generated/control-freak-font/CONTF___.ttf\
            :text='one'\
            :fontsize=32\
            :fontcolor=0xFFFFFF\
            :alpha='if(lt(t,30),0,if(lt(t,35),(t-30)/5,if(lt(t,65),1,if(lt(t,70),(5-(t-65))/5,0))))'\
            :x=w-text_w-12\
            :y=h-text_h-12 [upperleft];\
        [1:v] \
            trim=start=35.05, \
            setpts=PTS-STARTPTS, \
            scale=640x360, \
            drawtext=fontfile=/Users/vr/Downloads/gameplay_vids/generated/control-freak-font/CONTF___.ttf \
            :text='two' \
            :fontsize=32 \
            :fontcolor=0xFFFFFF \
            :alpha='if(lt(t,30),0,if(lt(t,35),(t-30)/5,if(lt(t,65),1,if(lt(t,70),(5-(t-65))/5,0))))' \
            :x=w-text_w-12 \
            :y=h-text_h-12 [upperright]; \
        [2:v] \
            trim=start=36.467, \
            setpts=PTS-STARTPTS, \
            scale=640x360, \
            drawtext=fontfile=/Users/vr/Downloads/gameplay_vids/generated/control-freak-font/CONTF___.ttf \
           :text='three' \
           :fontsize=32 \
           :fontcolor=0xFFFFFF \
           :alpha='if(lt(t,30),0,if(lt(t,35),(t-30)/5,if(lt(t,65),1,if(lt(t,70),(5-(t-65))/5,0))))' \
           :x=w-text_w-12 \
           :y=h-text_h-12 [lowerleft]; \
        [3:v] \
            trim=start=35.097, \
            setpts=PTS-STARTPTS, \
            scale=640x360, \
            drawtext=fontfile=/Users/vr/Downloads/gameplay_vids/generated/control-freak-font/CONTF___.ttf \
           :text='four' \
           :fontsize=32 \
           :fontcolor=0xFFFFFF \
           :alpha='if(lt(t,30),0,if(lt(t,35),(t-30)/5,if(lt(t,65),1,if(lt(t,70),(5-(t-65))/5,0))))' \
           :x=w-text_w-12 \
           :y=h-text_h-12 [lowerright];  \
        [2:a] \
           atrim=start=36.467, \
           asetpts=PTS-STARTPTS[outa]; \
           [base][upperleft] overlay=shortest=1 [tmp1]; \
           [tmp1][upperright] overlay=shortest=1:x=640 \
           [tmp2];[tmp2][lowerleft] overlay=shortest=1:y=360 \
           [tmp3];[tmp3][lowerright] overlay=shortest=1:x=640:y=360[v] \
    " -map "[v]" -map "[outa]" -c:v libx264 -shortest -ss 00:00 -to 9999 "output.mp4"


  


  

  • I want to trim the part between 37:23 and 37:33 of the output video

  


  • Is there a way I can do this without writing a separate ffmpeg command like a pipe or a chain or multiple filter_complex expressions ?

  


  


• "How can we use Ffmpeg to apply blur, overlay a logo and waveform, and add a border around a video, step by step ? [closed]

  1er février 2024, par itsfaisalkhalid

  We're looking to enhance a video using Ffmpeg by implementing several effects sequentially. First, we aim to apply a blur effect to the entire video. Then, we want to overlay a logo and a waveform onto the blurred video. Finally, we need to add a border around the entire composition. This step-by-step process requires precise commands and careful consideration of parameters to achieve the desired result effectively.

  


  I utilized Ffmpeg commands to sequentially apply blur, overlay the logo and waveform, and add a border to the video. I expected each effect to be applied in the specified order, resulting in a visually enhanced video with all desired elements. However, I encountered challenges in properly configuring the parameters for each effect, leading to unexpected results such as misaligned overlays or improper blur intensity.

  


  @echo off
setlocal enabledelayedexpansion

rem Set paths and directories
set "ffmpeg_path=C:\ffmpeg\bin\ffmpeg.exe"
set "input_dir=_input"
set "output_dir=_output"

rem Ensure input and output directories exist
if not exist "%input_dir%" (
    echo Error: Input directory "%input_dir%" not found.
    exit /b 1
)

if not exist "%output_dir%" (
    mkdir "%output_dir%"
)

rem Loop through input directory
for %%t in ("%input_dir%\*.*") DO (

    rem Process each file with ffmpeg
"%ffmpeg_path%" -y -i "%%t" -i logo.png -filter_complex "\
    [0:v]eq=brightness=0.2:saturation=2.0:contrast=1.2, crop=iw/1.2:ih/1.2, \
    boxblur=1:2 [blurred_bg]; \
    [blurred_bg][1:v]overlay=(main_w-overlay_w)/2:(main_h-overlay_h-10)[bg_with_logo]; \
    [0:a]showwaves=s=1080x100:mode=line:colors=white [waveform]; \
    [bg_with_logo][waveform]overlay=10:H-h-10, \
    format=yuv420p[v]; \
    [v]pad=iw+20:ih+20:x=10:y=10:color=white[final_output]" \
    -map "[final_output]" -map 0:a -c:v h264 -c:a aac -b:a 128k -ar 44100 "%output_dir%\temp.mp4"

    rem Check if output file exists
    if exist "%output_dir%\temp.mp4" (
        rem Calculate new MD5 hash
        certutil -hashfile "%output_dir%\temp.mp4" MD5 > "%output_dir%\temp_md5.txt"

        rem Remove ID3 tag metadata
        "%ffmpeg_path%" -i "%output_dir%\temp.mp4" -map_metadata -1 -c:v copy -c:a copy "%output_dir%\%%~nt.mp4"

        rem Clean up temporary files
        del "%output_dir%\temp.mp4"
        del "%output_dir%\temp_md5.txt"
    ) else (
        echo Error: Failed to create output file for "%%~nt"
    )
)

pause