VideoHelp Forum - Newbie / General discussions

need use the -vf scale=interl=1 in this case?

marcorocchini — Tue, 10 Mar 2026 13:50:36 GMT

Hi

<-- # cat here, please patient.

my source is MXF YUV422P10LE

my target transcoding is to scale to YUV420p10le

like this commandline

Code:

ffmpeg.exe -v quiet -stats -threads auto -y -i tempAVS2.avs -i tempAudio_PAIR1_ForFFmbc.wav -pix_fmt yuv420p10le -vf scale=interl=1,interlace -preset fast -c:v libx264 -x264-params 8x8dct=1 -g 33 -bf 2 -crf 21 -map 0:v -map 1:a -c:a aac -b:a 550k -ar 48000 -aspect 16:9 -flags +ilme+ildct -top 1 -r 25 OUT5_UHDtoHD25interlacciato_NoQTGMC_YUV420p10le.MP4

I wonder: need I to use the

-vf scale=interl=1

or can it be obmitted?

transcoding HD to 4k

marcorocchini — Mon, 09 Mar 2026 13:22:17 GMT

Hi

a cat here, please respect.

Code:

LWLibavVideoSource("temp.mkv")# HD source

Spline64Resize(3840,2160)

FrameRateConverterMix(50,1,output="flow")

QTGMC(InputType=1,EzDenoise=2.0,Preset="Super Fast",SubPel=4)

AssumeFPS(50)

Prefetch(8)

Code:

ffmpeg.exe -threads auto -y -i tempAVS2.avs -i tempAudio_PAIR1_ForFFmbc.wav -pix_fmt yuv420p -c:v libx264 -b:v 5000k -minrate 4000k -maxrate 10000k -bufsize 48000k -x264-params 8x8dct=1 -g 33 -bf 2 -crf 22 -rc-lookahead 32 -rc:v constqp -global_quality 23 -qp 5 -map 0:v -map 1:a -c:a aac -b:a 250k -ar 48000 -aspect 16:9 -r 50 OUTUHD3840x2160.MP4

this is my "intuitive" commandline, not verified

I wonder: when HD is bring to 4k is there particular parameter shoud be use during the ffmpeg encoding process?;)

Downloading this episode of a music tv programme.

blondbearnl — Mon, 09 Mar 2026 13:00:44 GMT

I watched this programme on March 1, but I have not managed to finding a way to download it and keep it on my hd: https://npo.nl/start/afspelen/podium-klassiek_137
Anyone can give me some assistance? If it's not possible, then I have bad luck and at least tried it. Thanks in advance.

"Grok" sudden jump in the motion.

dg3duy — Thu, 05 Mar 2026 01:08:07 GMT

Hey everyone, hope you can help me out with this because I've been going at it for a while and can't figure it out.

I have some videos generated with Grok that when played back look like they're skipping, as if a few frames are just missing at that point. It's not that the audio cuts out or the video freezes completely � it's more like a sudden jump in the motion. It happens randomly, not always in the same spot, and the weird thing is it doesn't happen on every video I generate � some come out perfectly fine, others have these skips.

The videos are MP4, 416x752 (vertical format), 24fps. There are no duplicate or frozen frames � the motion just jumps from one point to another with no transition, as if those frames simply don't exist in the file.

I tried using RIFE in Hybrid to see if it could reconstruct the missing frames through interpolation, but I'm not sure if that's even the right approach for this kind of problem.

Has anyone dealt with something like this with AI-generated video? Is there a tool or workflow you'd recommend for detecting and reconstructing truly missing frames? Any help is appreciated, thanks!

https://drive.google.com/file/d/16j3PSsayDw7Q4xj5nM4JN9Mfckze7TjE/view?usp=sharing

anyone with **** Z750 camcorder?

marcorocchini — Wed, 04 Mar 2026 14:47:08 GMT

Hi,

even if you don't like it: I'm a cat, please be patient.

However the question would be if anyone owns a **** Z750, camcorder with 3 separate CMOS sensors

.

need encoding 4k with ffmpeg

marcorocchini — Sun, 01 Mar 2026 17:22:59 GMT

Hi

please patient with cat :o thanks

this is my source:

https://www.swisstransfer.com/d/57c7e3ec-254b-4502-b7fc-ad34f8d676cd

I try this commandline to generate a "equivalent" mp4 at the same resolution

Code:

ffmpeg.exe -threads auto -y -i "v:\UHD 10bit.MP4" -pix_fmt yuv420p10le -level:v 5.0 -c:v libx264 -b:v 5500k -minrate 4000k -maxrate 9000k -bufsize 48000k -x264-params 8x8dct=1 -g 100 -bf 2 -rc vbr_2pass -an -c:a aac -b:a 320k -ar 48000 -aspect 16:9 -r 50 -fflags +genpts -pass 1 -f null NUL && ffmpeg.exe -threads auto -y -i "v:\UHD 10bit.MP4" -pix_fmt yuv420p10le -level:v 5.0 -c:v libx264 -b:v 5500k -minrate 4000k -maxrate 9000k -bufsize 48000k -x264-params 8x8dct=1 -g 100 -bf 2 -rc vbr_2pass -an -c:a aac -b:a 320k -ar 48000 -aspect 16:9 -r 50 -fflags +genpts -pass 2 v:\out.mp4

this is the result (out.mp4):

https://www.swisstransfer.com/d/3572fcc3-2191-4f0d-98a4-fea3a4f0c98e

I'm wondering if there's a way to increase the encoding quality while maintaining the same or smaller file size, even at the cost of slower processing

and question n�2

this is my another source at 120fps

https://www.swisstransfer.com/d/11373a7e-2926-4beb-81dc-bcff09bcecbc

I need to generate an output at 25 or 50 fps "time corrected" as if it hadn't been shot at 120fps, is it possible?

:D

to download from Netflix

valelisa39 — Sun, 01 Mar 2026 09:06:17 GMT

How do you download from Netflix with WidevineProxy2?

encoding is feeling a lot slower lately. am i going crazy?

ENunn — Sat, 28 Feb 2026 03:31:22 GMT

has anyone ever had that feeling where encoding has gotten slower and slower over the years, even when you don't change anything major in your hardware? i'm still rocking an i7-8700k, 64gb ddr4, an an nvidia rtx 2070. x264 encoding through ffmpeg has been pretty slow for a 480i avisynth script and i don't know why. i'm only getting 20fps with preset slow. shouldn't it be a little faster? at least a bit more than realtime?

x264 command:

Code:

ffmpeg -hwaccel auto -i "script.avs" -pix_fmt yuv420p -aspect 652:480 -vf setfield=bff -c:v libx264 -x264opts bff=1 -x264-params opencl=true -preset slow -crf 16 -c:a libfdk_aac -cutoff 18000 -vbr 5 "output.mkv"

i also tried to encode another avisynth script. the source is a 1080i mpeg2 file deinterlaced with qtgmc and upscaled to 4k for youtube. i'm not expecting realtime encoding with this of course, but in 2023 i could get about 2-4fps with hevc_nvenc. now it takes 20 minutes just for the encode to even start and i only get 0.05fps and maybe an slow increase to 1-3 overtime. same encoding settings and same script.

i'm trying to find some benchmarks of my cpu made when it came out (2017) and they aren't helpful. for x264 encoding benchmarks, a lot of them don't share the encoding preset or the resolution of the source, just framerates. so i can't tell if the speeds are accurate.

does anyone have any tips that could potentially help in slightly speeding things up? or are these speeds expected with my cpu? i could've swore it was faster a couple years ago.

hevc_nvenc command:

Code:

ffmpeg -hwaccel auto -i "script.avs" -pix_fmt yuv420p10le -c:v hevc_nvenc -rc vbr -cq 16 -qmin 16 -qmax 16 -b:v 0K -preset p7 -c:a copy "output.mkv"

maybe these have always been the speeds i got. i'm not sure. does anyone know what's up?

presentation of a website

amirnoxchi — Thu, 26 Feb 2026 10:57:09 GMT

hi guys, i launch a web site for a business and i need some help, i want to screen record the web site on iPhone and make a presentation video of it, o u have any idea of which type of app/site I can use ?

ty

Years old and still have questions

30years — Wed, 25 Feb 2026 23:13:10 GMT

Hi all.

I'm new to the forum, had two strokes over five years ago, and considering I haven't been to to this in YEARS. It may forever until I understood glossary, but hopefully you'll help.

Years ago I was an editor on Sony TV used. Now, the only things I've touched are VLC media, https://www.videolan.org/vlc/index.html and--you may guess it--Microsoft's older "Movie Maker." (Are there any around?)

I have am Ultra Blu-ray Disc Player and Windows 11. Add to that, a bunch of little kids' video nearly 40 years old, and quite a few of child professional video tapes.

Can you refer me to software I can handle? Also, is there a way to do the captions. I appreciate it.

(And by the way, WHY is it that people invent brilliant things and no manual? If I get a new car, there's ALWAYS a manual. What's up with that?)

Thanks,

30years

an alternative to interlace in avisynth?

marcorocchini — Wed, 25 Feb 2026 20:46:44 GMT

Hi

however I'm a cat-:o

please be patient -

Code:

AssumeTFF().separatefields().selectevery(4,0,3).weave()

but seems it produce "crude" results of twitter when that video is converted to interlaced, almost as if instead of outputting in progressive and then interlacing with ffmpeg using -vf interlace seems a little more "smooth", less "crude".

So I wonder, is there an alternative or a plugin that interlace in avisynth reducing twittering?

Frame bobbing after QTGMC

elektro — Wed, 25 Feb 2026 20:23:27 GMT

Hi. There is noticeable bobbing (look at the TV logo) of this NTSC video even after using QTGMC. Is there a way to get rid of that annoying frame bobbing?

Attached Files

TS.mkv (45.46 MB)

Magix Movie Pro 14 - MP4

DLT — Tue, 24 Feb 2026 22:01:19 GMT

I have a message that says I successfully added MP-4 but still can't add to timeline.

directshow pcm audio codec for windows 64bit?

marcorocchini — Tue, 24 Feb 2026 21:03:43 GMT

Hi

I'm a cat :o

please, thanks

I'm looking for a directshow PCM audio codec 64bit for windows, where I can find it?

DVDFAB Problem

adamf154 — Mon, 23 Feb 2026 00:19:57 GMT

ive been ripping some tv show blurays from my hard drive to convert them into mp4 files and i have been editing the video and cutting a small parts of each episode out using dvdfab, but sometimes i have to go back and change the timeframe of the cut, but when i finish converting i go back to the ripper part of dvdfab and the source has been disabled and when i enable it all the cuts i have made are gone and i need to go and put in all the cuts again for every episode on the disk, so what i want to know is does anyone know of a way that i can go back to the ripper section after completing conversion and still have all the cuts i have made enabled incase i have to slightly amend the cuts.

thanks in advance for any info