[SOLVED] [ffmpeg] How to combine multiple items in -vf ?

[yetanotherlogin]

Hello,

I can't figure out why the following command doesn't scale the video down from 1200 pixels to 640 pixels as expected:

ffmpeg.exe -i input.mov -preset faster -t 15 -c:v libx264 -vf scale=-640:-1,lutyuv=y=val*1.30,format=pix_fmts=yuv420p -c:a aac -b:a 128k -ac 2 -ar 44100 -af "volume=0.3" -threads 2 -f mp4 output.mp4

What am I doing wrong?

Thank you.

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Edit: In case I'd like to speed up the video by 50%, how should I add the setting below?

"setpts=0.5*PTS"

[poisondeathray]

-vf scale=-640:-1

typo ?

did you try 640 instead of -640 ?

[yetanotherlogin]

Yes, indeed, a typo

What about speeding it up? How should I insert "setpts=0.5*PTS" into the vf option?

[sneaker]

Like you separated the other filters: with a comma.

( 50% speedup would be *0.75, I think.)

[yetanotherlogin]

Thank you.

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Edit: Appartently, speeding up a video isn't as simple as adding "setpts=0.5*PTS" to the "-vf" switch: The video stops halfway through while the audio keeps going

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Edit: This doesn't work. The video is neither scaled down to 720:whatever nor sped up"

ffmpeg -i input.mp4 -filter_complex "scale=720:404;[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" -c:a aac -b:a 128k -ac 2 -ar 44100 -threads 2 -f mp4 output.mp4

Looks like you can't add a "scale" switch to a "filter_complex" command.

[yetanotherlogin]

The work-around is to run the command twice:

ffmpeg -i input.mp4 -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" -f mp4 output.sped.up.mp4

ffmpeg -i output.sped.up.mp4 -vf "scale=720:404" -crf 18 -f mp4 output.sped.up.resized.mp4

[pandy]

Of course you can add scale... bellow is example (without PTS manipulation but this should not be a problem).

-vf "eq=contrast=256/220:brightness=1/512:saturation=256/224:gamma=16/16,scale=640:-4:sws_flags=spline+accurate_rnd+full_chroma_int+full_chroma_inp:sws_dither=0:in_range=1:out_range=1,hqdn3d=8,tblend=all_mode=average,smartblur=lr=1.75:ls=-0.50:lt=-5.5:cr=0.5:cs=1.0:ct=0.5,minterpolate=fps=25:mi_mode=mci:me_mode=bidir:me=ntss:vsbmc=1,xbr=2,scale=s=320x256:force_original_aspect_ratio=decrease:sws_flags=spline+accurate_rnd+full_chroma_int+full_chroma_inp:sws_dither=2:in_range=1:out_range=1,format=pix_fmts=yuv420p"

[yetanotherlogin]

The problem is that speeding up video+audio requires a complex filter:

ffmpeg -i input.mp4 -vf "scale=640:-1,format=pix_fmts=yuv420p" -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" output.mp4

Filtergraph 'scale=640:-1,format=pix_fmts=yuv420p' was specified through the -vf/-af/-filter option for output stream 0:0, which is fed from a complex filtergraph. -vf/-af/-filter and -filter_complex cannot be used together for the same stream.

[pandy]

works for me...

@set OUTDIR="out"
@if not exist %OUTDIR% (mkdir %OUTDIR%)
@ffmpeg -i "%1" -vf "scale=720:404,setpts=0.5*PTS" -af "atempo=2.0" -c:a pcm_s16le -c:v huffyuv -f matroska "%OUTDIR%\output.sped.up.mkv"

[yetanotherlogin]

Thanks !

ffmpeg -i input.mp4 -c:v libx264 -vf "scale=720:-1,setpts=0.5*PTS,format=pix_fmts=yuv420p" -af "atempo=2.0" -c:a aac -b:a 128k -ac 2 -ar 44100 -threads 2 -f mp4 output.mp4

[pandy]

Thanks !

ffmpeg -i input.mp4 -c:v libx264 -vf "scale=720:-1,setpts=0.5*PTS,format=pix_fmts=yuv420p" -af "atempo=2.0" -c:a aac -b:a 128k -ac 2 -ar 44100 -threads 2 -f mp4 output.mp4

IMHO better like this:

ffmpeg -threads 2 -i input.mp4 -c:v libx264 -vf "scale=720:-2,setpts=0.5*PTS,format=pix_fmts=yuv420p" -af "atempo=2.0" -c:a aac -b:a 128k -ac 2 -ar 44100 -f mp4 output.mp4