Cut every other frame in 60fps to make same duration 30fps video?

[bizzybody]

I have a TV series where at the highest resolution available *some* of the episodes are only available in 60 FPS. When I compress with H.265 those files are larger than the 30 FPS ones with the same compression settings.

What can be done to remove every other frame without making a mess of it?

[CoralMan]

Easily done with Avisynth:

DirectShowSource("My video.mp4")
ChangeFPS(30)

[bizzybody]

I installed Avisynth and AvsPmod. AvsPmod says the TS file is 29.970 frames per second and plays it at correct speed. MediaInfo says it's 60. PotPlayer plays the video at correct speed.

How do I tell if it's actually 60FPS or if that's just a glitch with the encoder possibly causing VidCoder to encode every frame twice and make a larger H.265 output? The TS files that MediaInfo says are 60FPS are somewhat larger than the ones it says are 30, but not 2x the size.

[davexnet]

I installed Avisynth and AvsPmod. AvsPmod says the TS file is 29.970 frames per second and plays it at correct speed. MediaInfo says it's 60. PotPlayer plays the video at correct speed.

How do I tell if it's actually 60FPS or if that's just a glitch with the encoder possibly causing VidCoder to encode every frame twice and make a larger H.265 output? The TS files that MediaInfo says are 60FPS are somewhat larger than the ones it says are 30, but not 2x the size.

Open the file with Mediainfo, text view, and paste it into the thread here

[bizzybody]

General
ID : 1 (0x1)
Complete name : K:\TV Shows\<clip show name>1280x720-5218K.ts
Format : MPEG-TS
File size : 542 MiB
Duration : 24 min 2 s
Overall bit rate mode : Variable
Overall bit rate : 3 152 kb/s

Video
ID : 258 (0x102)
Menu ID : 1 (0x1)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.2
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : 27
Duration : 24 min 2 s
Bit rate mode : Variable
Maximum bit rate : 12.0 Mb/s
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate : 60.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio
ID : 257 (0x101)
Menu ID : 1 (0x1)
Format : AAC LC SBR
Format/Info : Advanced Audio Codec Low Complexity with Spectral Band Replication
Commercial name : HE-AAC
Format version : Version 4
Format settings : Implicit
Muxing mode : ADTS
Codec ID : 15-2
Duration : 24 min 2 s
Bit rate mode : Variable
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 23.438 FPS (2048 SPF)
Compression mode : Lossy

Text
ID : 258 (0x102)-CC1
Menu ID : 1 (0x1)
Format : EIA-608
Muxing mode : SCTE 128 / DTVCC Transport
Muxing mode, more info : Muxed in Video #1
Duration : 24 min 2 s
Bit rate mode : Constant
Stream size : 0.00 Byte (0%)
CaptionServiceName : CC1

Menu
ID : 256 (0x100)
Menu ID : 1 (0x1)
List : 257 (0x101) (AAC) / 258 (0x102) (AVC) / 259 (0x103) ()

[ProWo]

Try my clever-FFmpeg-GUI. Load your file, Main, Modify video stream, continue, set FPS to 29.97, set the encoder and his settings, leave the rest as is, click convert.
Then click on multiplex, set the new created file al video source, your original file as audio source, set the desired audio language and click multiplex. Done.

[bizzybody]

Try my clever-FFmpeg-GUI. Load your file, Main, Modify video stream, continue, set FPS to 29.97, set the encoder and his settings, leave the rest as is, click convert.
Then click on multiplex, set the new created file al video source, your original file as audio source, set the desired audio language and click multiplex. Done.

What shows up on Main is Extract with a button for audio stream, Modify with buttons for audio stream and cut, Multiplex with a button labeled multiplex, and Other with buttons for change source folder and change language.

Nothing for video with this TS source file.

[ProWo]

What shows up on Main is Extract with a button for audio stream, Modify with buttons for audio stream and cut, Multiplex with a button labeled multiplex, and Other with buttons for change source folder and change language.
Nothing for video with this TS source file.

Cut a sample of 10sec and post it here for analysis.
ffmepg. exe -t 10 -i "your.ts" -map 0 -c copy sample.ts

[bizzybody]

In an elevated cmd window I go to the folder where the .ts file is, I enter the command, with the your.ts replaced with the proper file name between the quotes. ffmpeg.exe is in the same folder.

I get this

'ffmepg.exe' is not recognized as an internal or external command,
operable program or batch file.

But if I just enter ffmpeg or ffmpeg.exe on its own I get the command list. #$^#$ing stupid Windows.

ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10.2.1 (GCC) 20200726
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

Use -h to get full help or, even better, run 'man ffmpeg'

[ProWo]

In an elevated cmd window I go to the folder where the .ts file is, I enter the command, with the your.ts replaced with the proper file name between the quotes. ffmpeg.exe is in the same folder.

I get this

'ffmepg.exe' is not recognized as an internal or external command,

It was a typo. Retry with ffmpeg.exe -t 10 -i "your.ts" -map 0 -c copy sample.ts

[bizzybody]

In an elevated cmd window I go to the folder where the .ts file is, I enter the command, with the your.ts replaced with the proper file name between the quotes. ffmpeg.exe is in the same folder.

I get this

'ffmepg.exe' is not recognized as an internal or external command,

It was a typo. Retry with ffmpeg.exe -t 10 -i "your.ts" -map 0 -c copy sample.ts

That's exactly the same command string you posted before. ;P I copied and pasted both to a text file to compare.

[ProWo]

The first command was ffmepg.exe...

[jagabo]

In an elevated cmd window I go to the folder where the .ts file is, I enter the command, with the your.ts replaced with the proper file name between the quotes. ffmpeg.exe is in the same folder.

I get this

'ffmepg.exe' is not recognized as an internal or external command,

It was a typo. Retry with ffmpeg.exe -t 10 -i "your.ts" -map 0 -c copy sample.ts

That's exactly the same command string you posted before.

No, it's not. The first version transposed letters (ffmepg vs ffmpeg) had a space between ffmpeg. and exe. The new version doesn't.

[bizzybody]

Here's a sample

[ProWo]

Here's a sample

Best is to leave it at 60fps and just re-encode to hevc. You can save 3/4 space. Take a look at my sample.
You can use FFmpeg-GUI for this. Download the latest beta version, it fixes the bug you reported.
https://files.videohelp.com/u/292773/clever_ffmpeg_gui_newest_beta.7z

[jagabo]

Transport streams can be difficult. And this one is unusual. The clip is ~10 seconds long and according to ffprobe there are 301 frames (consistent with ~30 fps). Every player I tried played it at 29.97 fps. But it's a film source with duplicates. So it should be decimated back to 23.976 fps:

ffmpeg -i input.ts -vf "fieldmatch=order=tff,decimate=cycle=5:" -c:v libx264 -c:a copy output.mp4

[bizzybody]

Would be nice to know what software is being used to do the original encoding, and why some episodes are being erroneously tagged as 60 fps yet play correctly.

[bizzybody]

Transport streams can be difficult. And this one is unusual. The clip is ~10 seconds long and according to ffprobe there are 301 frames (consistent with ~30 fps). Every player I tried played it at 29.97 fps. But it's a film source with duplicates. So it should be decimated back to 23.976 fps:

ffmpeg -i input.ts -vf "fieldmatch=order=tff,decimate=cycle=5:" -c:v libx264 -c:a copy output.mp4

That works. Ran the full file with that then encoded to H.265 with VidCoder, same settings. Looks as good to me, quite a bit smaller than running the original TS through.

[ProWo]

That works. Ran the full file with that then encoded to H.265 with VidCoder, same settings. Looks as good to me, quite a bit smaller than running the original TS through.

So you have encoded your video twice...

[ProWo]

Transport streams can be difficult. And this one is unusual. The clip is ~10 seconds long and according to ffprobe there are 301 frames (consistent with ~30 fps). Every player I tried played it at 29.97 fps. But it's a film source with duplicates. So it should be decimated back to 23.976 fps:

ffmpeg -i input.ts -vf "fieldmatch=order=tff,decimate=cycle=5:" -c:v libx264 -c:a copy output.mp4

Good hint, Jagabo

[jagabo]

I still don't understand the TS file though. It has 301 frames and each frame is marked to display for 1/60 second. And the timestamps for each frame increments by 1/60 second with each frame. That would make the video 5 seconds long, not 10 seconds. But when played by media players the frames display at 29.97 fps for 10 seconds. There must be something else in the transport stream data that tells the players to play the video at 29.97 fps. Or maybe ffprobe is just calculating incorrectly.

[Anonymous84]

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