Aspect ratio is not...
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Aspect ratio is not saved when rendering

11 Posts
4 Users
Topic starter

Hello, everyone!

When creating a new project, the aspect ratio was 16:9 (like the original file), but when rendering, the final file has a 5:4 aspect ratio. How can I fix it?
I would be grateful for any help.

7 Answers


I can not reproduce the problem you are seeing.  Which render format are you using? Perhaps it is changed due to that format requirements.  Here are the steps I took and they worked perfectly.

1) File-> new project

2) changed format to 16:9

3) loaded to Resources only a video of 16:9 aspect ratio

4) rendered using format ffmpeg/mp4 (h264.mp4)

Resulting file was also 16:9.  I also tried the same file BUT this time used the Settings->Format option to change the format to 4:3; did the render; and the resulting aspect ratio was as designated 4:3. 

Or perhaps you had another video loaded on another track that changed the format? 

Try this: right before you start the Render, check Settings->Format to make sure it read 16:9.



the above 2 may have more insight.


I also have no aspect ratio problem with rendering.
Could you provide more data? What filters did you use? What rendering profile did you use? Did you use the Camera/Projector tools? Do you use a proxy? ...


Could you, @rminavesi, tell us more info, please?

Topic starter

Thank you for your help. Yes, when using mp4, the aspect ratio is preserved. But I used container MKV (flac.mkv, ffv1.mkv), and that's where the problems arose, the aspect ratio is not saved.

phylsmith2004 15/04/2023 4:53 pm


Using MKV with the same parameters preserves the 16:9 aspect ratio when I test that too.  I used the program "mediainfo" to verify that and the results are shown below.  I started out with the default  $HOME/.bcast5/Cinelerra_rc file just to make sure that I had not introduced any specific settings.

Complete name : rendered.mkv
Format : Matroska
Format version : Version 4
File size : 5.54 GiB
Duration : 1 min 19 s
Overall bit rate mode : Variable
Overall bit rate : 599 Mb/s
Writing application : Lavf59.27.100
Writing library : Lavf59.27.100
ErrorDetectionType : Per level 1

ID : 1
Format : FFV1
Format version : Version 3.4
Duration : 1 min 19 s
Bit rate mode : Variable
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9

ID : 2
Format : FLAC
Format/Info : Free Lossless Audio Codec
Codec ID : A_FLAC
Duration : 1 min 19 s
Bit rate mode : Variable
Channel(s) : 2 channels



@rminavesi, Could you check that your source video is not recorded with anamorphic format, please?
Anamorphic format doesn't use square pixels. What I know, FFV1 on mkv container don't care DAR (Display Aspect Ratio).
You can chech that using Mediainfo program.

Rminavesi Topic starter 22/04/2023 7:00 am

@igorbeg Mediainfo

Format : DV
Commercial name : DVCAM
Duration : 4 min 51 s
Bit rate mode : Constant
Bit rate : 24.4 Mb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 FPS
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Bottom Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 2.357
Time code of first frame : 00:00:00:11
Time code source : Subcode time code
Stream size : 849 MiB (85%)

IgorBeg 22/04/2023 7:57 am

Thanks @Rminavesi for the Mediainfo info!
Yes, this is an anamorphic format. Because 720/576=1.25 and DAR is 16/9=1.777.
SAR (Storage Aspect Ratio) is different from DAR and you have to use a workaround.

You can see an excellent workaround in "Cinelerra for Grandma" site by Raffaella Traniello:

I hope it help.




Thanks Igor for explaining this.  I have added this usage hint to the manual.  (Andrea please review the checked in change and correct any mistakes). 

andreapaz 22/04/2023 5:02 pm


Good job; thanks!

Topic starter

@IgorBeg Thank you for your help and clarification