# PowerShell command version discussion (2025-11-19 10:02Z) _**User (2025-11-19 09:43Z)**_ @pwsh (5-29) --- _**Agent (model default, mode Agent)**_

Thought Process

**Explaining ffmpeg scaling expression issue**

--- `min()` only accepts two inputs, so nesting three values in one call makes the filter expression invalid. A cleaner way to cap the GIF at 1024 px on either axis while preserving aspect ratio is to compare the dimensions to 1024 explicitly: ``` ffmpeg -i rainypet.gif -vf "scale='if(gt(iw,1024),1024,iw)':'if(gt(ih,1024),1024,ih)'" -fs 1M rainypet4.gif ``` This tells ffmpeg to use 1024 whenever a dimension exceeds that limit, otherwise keep the original value, so you avoid the parse error and still constrain the size. --- _**User (2025-11-19 09:43Z)**_ needs transparency --- _**Agent (model default, mode Agent)**_

Thought Process

**Considering GIF scaling with transparency**

--- Use a two-pass palette workflow so ffmpeg keeps the alpha channel: ``` ffmpeg -i rainypet.gif -vf "scale='if(gt(iw,1024),1024,iw)':'if(gt(ih,1024),1024,ih)',split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -fs 1M rainypet4.gif ``` - `split` lets one branch create the palette while the other applies it. - `paletteuse` re-applies the palette with transparency preserved. - `-fs 1M` still enforces the 1 MB cap. Run that and the new GIF will stay ≤1024 px on each side and keep its transparent pixels. --- _**User (2025-11-19 09:43Z)**_ why did it speed it up? --- _**Agent (model default, mode Agent)**_

Thought Process

**Explaining frame rate impact from scaling**

--- GIF frame timing is stored as per-frame delays, not a global FPS. When ffmpeg filters the frames (scale + split + palettegen/paletteuse), it often rewrites the stream from scratch. If the sample delays in the source were unusual—e.g., some frames at 2 cs (50 fps) and others longer—ffmpeg may normalize them to the default 1 cs (100 fps) or simply round everything to 2 cs, making the animation feel faster. You can lock the intended timing by explicitly telling ffmpeg what delay you want: ``` ffmpeg -i rainypet.gif -filter_complex "scale='if(gt(iw,1024),1024,iw)':'if(gt(ih,1024),1024,ih)',split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse,setpts=N/50/TB" -fs 1M rainypet4.gif ``` Adjust the divisor in `setpts=N/50/TB` to match the real frame rate (50 here). If the original GIF used a different cadence, replace `50` with the actual fps or compute it from the original delays. ---