Avidemux Forum

Yes, indeed, as it says:
"If everything else fails - try ffmpeg".

ffmpeg actually preserves the AR,
and I use the workaround you describe as the last resort.

However I wouln't have expected that ADM doesn't allow directly.

Thx for the hint to MediaInfo trick

EDIT:
https://avidemux.org/smif/index.php/topic,20768.0.html

FYI, 2.56 can be found here, https://sourceforge.net/projects/avidemux/files/avidemux/2.5.6/.

Anyhow, it cannot hurt to try the latest nightly too (& is apt to work better, in general).

Will ffmpeg output a cut with the expected AR ?

ffmpeg -i input.mp4 -c copy -t 00:01:00 testout.mp4

If so, get the cut points with Avidemux & use ffmpeg to make the cuts.


I'll also note that sometimes MedaInfo might provide better "clues" if you click, Debug | Advanced Mode.

Some times later... I'm at the same problem, but now more serious (AR is very different from 1):

The movie shows at 507 * 406 (= 5/4).

ADM info box:
=====================================================
Video
=====================================================
Codec 4CC:            H264
Image Size:            720 x 406
Aspect Ratio:            Unknown (203:288)
Frame Rate:            25.000 fps
Average Bitrate:        500 kbps
Total Duration:            00:27:23.280
Pixel format:            YUV 4:2:0, 8-bit
Color range:            Limited (MPEG)
Color primaries:        BT.709
Transfer characteristics:    BT.709
Color space:            BT.709

=====================================================
Video Codec Extradata
=====================================================
Size:                51
Extradata:            01 64 00 1E FF E1 00 1E 67 64 00 1E AC D9 40 B4 35 F9 BF F0 0C B0 12 01 00 00 03 00 01 00 00 03 00 32 0F 16 2D 96 01 00 06 68 EB E3 4B 22 C0 FC F8 F8 00


MediaInfo output:
General
Complete name               : D:\movie.mp4
Format                      : MPEG-4
Format profile              : Base Media
Codec ID                    : isom (isom/iso2/avc1/mp41)
File size                   : 118 MiB
Duration                    : 27 min 23 s
Overall bit rate            : 602 kb/s
Writing application         : Lavf57.71.100

Video
ID                          : 1
Format                      : AVC
Format/Info                 : Advanced Video Codec
Format profile              : High@L3
Format settings             : CABAC / 4 Ref Frames
Format settings, CABAC      : Yes
Format settings, Reference  : 4 frames
Codec ID                    : avc1
Codec ID/Info               : Advanced Video Coding
Duration                    : 27 min 23 s
Bit rate                    : 500 kb/s
Width                       : 720 pixels
Height                      : 406 pixels
Display aspect ratio        : 5:4
Frame rate mode             : Constant
Frame rate                  : 25.000 FPS
Color space                 : YUV
Chroma subsampling          : 4:2:0
Bit depth                   : 8 bits
Scan type                   : Progressive
Bits/(Pixel*Frame)          : 0.068
Stream size                 : 98.0 MiB (83%)
Writing library             : x264 core 142 r2431 a5831aa
Encoding settings           : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=8 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=500 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Codec configuration box     : avcC

I haven't found ANY way to lossless output a part of it.
The configure box of eg. mp4-container doesn't allow to choose DAR 5/4;
and "Derive from display width" doesn't help either.

I must miss something, as this should be simply possible, shouldn't it?
Help please.

2.8.2 nightly build works

Please verify that the issue persists with the latest available 2.8.2 nightly build.

If run in portable mode, admlog.txt might reside in the program directory, else in %localappdata%\avidemux. Anyway, 2.8.1 is ancient despite being the last published release.

Version 2.8.0 works well
version 2.8.1 can open files located on a local NAS if the share is mapped as a network drive.

version 2.8.1 can't open files located on local lan server.
Opening a \\server\share\folder shows this error:
---------------------------
Info
---------------------------
<big><b>Could not open the file</b></big><br><br>
---------------------------
OK   
---------------------------

Microsoft Windows 11 Pro
10.0.26100 build 26100
no "admlog.txt" found

I'm using Kubuntu 25.04 using KDE Plasma with Wayland. Avidemux froze after opening a video when using the appimage (v 2.8.1). This problem doesn't occur using X11.

I went into preferences and set Video Display to "OpenGL". It was on "VDPAU" by default. No more freezing.

Handling subs is very complex to do well and it depends on what hardware and processing speed each end user has.  Very fast servers with hardware transcoding support can handle most embedded subtitles but even these server can fail to process in real time wen there are too many embedded subtitles for media coming from original blu-ray discs.  Blu-ray players are set to handle one sub at a time. Servers, even with hardware encoding support see all the subtitles and tries to handle them in sequence during the transcoding. Even a dedicated fast and hardware supported server may not be able to handle all he subtiles in real time.

Keeping many subtitles embedded in .mkv media including graphic subtitles .sub works fine with blu-ray playback but other players do not support .sub or some don' even do .ass files.  The .sub files need to be scanned, read by a optical character reader and converted to text based subtitles that the user's player, browser or TV app can accept.  This has to be done in real time or the sync goes bad or the media buffers before any playback starts.

This problem varies with every user, every hardware and every network / Internet connection speed and traffic.  In short, .sub graphic subtitles are fine for blu-ray and not really supported for video streaming.  Trying to support them would be pointless, because it depends on each user as to what bandwidth and hardware processing their hardware and software player can handle.

This type of subtitle support won't work with the current hardware.  In my opinion, there is no point in trying.  Take the embedded subtitles and convert them to text .srt.  Most players support this and there is no lag time for processing.  You are asking everything to be automatic so you don't have to prep anything, but video streaming that works smoothly has to be prepared and it is different than blu-ray playback.

There is software that can take out all embedded subtitles for all media in a directory and subdirectory.  It's possible to create a command line and point the software at 10,000 videos and the software will do them all when you click 'Enter'.  Average computer can do a 2 hour media remove embedded subtitles around 10 a minute.

The sync should be fine, but even if it needs adjustment there are online services that can adjust a subtitle in ms plus or minus in a few seconds.

The video collection is yours, so prep it correctly and remove the subtitles yourself with tools. MKVCleaver MKVtoolnix, full ffmpeg install.

Online services:
https://subtitletools.com/subtitle-sync-shifter
https://subtitletools.com/convert-sub-idx-to-srt-online

Online professinal sites that sell content make sure their playback has been prepped in this way with all sub converted ahead of time.  I do not believe any online streaming site includes embedded subtitles.  If someone knows of one, please do post it here.  These sites are running these support software to remove subtitles and convert them so their streaming playback works for everyone.  Doing it automatically is not reasonable to even attempt.

This version of Karate Kid was probably shot in Canada with DCI specification represent 2K or 4K image resolution in 24 fps or 48 fps (frame per second) in JPG2000 sequence / Interop
So the original is probably released online with 24 fps.  Your version is 25 fps and dubbed.

Two hours would have 25 fps to be 180,000 frames and 24 fps would be 172,800 frames, a difference of 7,200 frames, would be 288 seconds or 4 minutes 48 seconds.  What happens is that the video gets an extra frame blended into it every second.  Two frames are blended together and that result is added to the sequence of frames, so playback on 25 fps TV looks fine.  The background audio can either be slowed down to match 24 frames in a second, which would lower the pitch or it can be then harmonized back upward so the music is in key and the sound effects are not slowed down.  Then the audio dub goes on top of this background audio track and is synced for 25 fps for European TV playback.

A lot of this is sort of uncessasary background info.  I wanted to point out how much manipulation is done for some copies of media.  Both video and audio are not original anymore.  Is the one track that doesn't sync unique and have different content or is it the same as the previous track.  Perhaps it is a copy that syncs better with 24 fps?  There are many steps where the audio sync can fail because of that the original media was already convereted for 25 fps playback.  I think if you want everything to sync, get the original media content that has not been converted to 25 fps and work with that instead.