I used this command in the terminal to have some details on how to use it :
ffmpeg -h filter=rgbashift Because I couldn’t find informations I asked to Chat GPT what ..FV.....T. means and here is the answer : The string ..FV.....T. provides information about the capabilities and options of the filter. Each character in the string represents a specific feature or attribute of the filter. Here's the breakdown: . (dot): Placeholder for a feature that is not applicable or not available. F: The filter supports frame-level multithreading, meaning it can process multiple frames concurrently. V: The filter supports slice-level multithreading, which allows for parallel processing of different slices of a frame. T: The filter supports temporal multithreading, indicating that it can take advantage of temporal dependencies between frames. So, in the case of ..FV.....T., the filter supports frame-level multithreading (F), slice-level multithreading (V), and temporal multithreading (T). The dots in other positions suggest that some features might not be applicable or available for this specific filter. > Le 22 déc. 2023 à 22:45, Paul B Mahol <one...@gmail.com> a écrit : > > On Fri, Dec 22, 2023 at 10:43 PM emmanuel martin <ask.emman...@gmail.com > <mailto:ask.emman...@gmail.com>> > wrote: > >> Hello everyone, >> >> The rgbashift command is causing me some trouble when I refer to its >> documentation. Perhaps the issue stems from a misunderstanding. Here's the >> part that interests me: >> >> rgbashift AVOptions: >> rh <int> ..FV.....T. shift red horizontally (from >> -255 to 255) (default 0) >> rv <int> ..FV.....T. shift red vertically (from >> -255 to 255) (default 0) >> gh <int> ..FV.....T. shift green horizontally >> (from -255 to 255) (default 0) >> gv <int> ..FV.....T. shift green vertically (from >> -255 to 255) (default 0) >> bh <int> ..FV.....T. shift blue horizontally >> (from -255 to 255) (default 0) >> bv <int> ..FV.....T. shift blue vertically (from >> -255 to 255) (default 0) >> ah <int> ..FV.....T. shift alpha horizontally >> (from -255 to 255) (default 0) >> av <int> ..FV.....T. shift alpha vertically (from >> -255 to 255) (default 0) >> edge <int> ..FV.....T. set edge operation (from 0 >> to 1) (default smear) >> smear 0 ..FV.....T. >> wrap 1 ..FV.....T. >> >> If I understand correctly, 'T' indicates that the option can be set at the >> video filter level and over time, meaning the value can dynamically change >> based on the time in a video sequence. In other words, I can change the >> offset value of each color channel over time. >> >> The simple command below works perfectly: >> >> ffmpeg -i input.mp4 -vf "rgbashift=rh=20:bh=-20" -pix_fmt yuv420p >> output.mp4 >> >> However, as soon as I integrate the 'T' parameter into the offset value, I >> get error messages. For example: >> >> ffmpeg -i input.mp4 -vf "rgbashift=rh='t*2':bh='t*-2'" -pix_fmt yuv420p >> output.mp4 >> >> Error message: >> >> Undefined constant or missing '(' in 't*2' Unable to parse option value >> "t*2" Error applying option 'rh' to filter 'rgbashift': Invalid argument >> >> Do I have a misunderstanding of the documentation (ffmpeg -h >> filter=rgbashift) ? Or do I have a syntax problem somewhere? >> > > Do you see anywhere in rgbashift documentation that it mentions > *explicitly* the _t_ parameter ? > > Thank you very much. >> _______________________________________________ >> ffmpeg-user mailing list >> ffmpeg-user@ffmpeg.org <mailto:ffmpeg-user@ffmpeg.org> >> https://ffmpeg.org/mailman/listinfo/ffmpeg-user >> >> To unsubscribe, visit link above, or email >> ffmpeg-user-requ...@ffmpeg.org <mailto:ffmpeg-user-requ...@ffmpeg.org> with >> subject "unsubscribe". >> > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org <mailto:ffmpeg-user@ffmpeg.org> > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org <mailto:ffmpeg-user-requ...@ffmpeg.org> with > subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
