Rotation Video

[Drakon66]

Hello There is problem. When save rotated by 180 degree video plays in media player correct but when open avimeduz and start editing again it still is rotated by 180.. This is problem beacuse when i append other video it is rotated 180 degreee to this roated by 180. How fix it.

[Geo_log]

..and start editing again it still is rotated..

1. Append all necessary files.
2. In the first button under "Video Output" choose Mpeg4 AVC
3. In the button "Filters" choose "Rotate", Angle:180 degrees
4. Save video.

[eumagga0x2a]

1. First re-encode the video which needs rotation metadata to be displayed correctly with "rotate" and other necessary filters applied, using preferably a lossless codec (if you have plenty of storage space) or x264 with "Mezzanine" preset, then...

2. ...append all videos in appropriate order, then...

3. ...re-encode the whole using codec and encoder you need.

[Drakon66]

 "Geo_Log" and it work but I dont want to render/re-encode my video just work on my copies.

 I use option in configure. The output is set correct but when i open it again by avimedux its again rotated. Why it is so much complicated

[Geo_log]

When save rotated by 180 degree video plays in media player correct...

The Media player first reads the "Rotate video" flag in the container (MP4 in this case). But Avidemux always ignores this flag because it is an editor, not a pleer.

I use option in configure. The output is set correct but when i open it again by avimedux its again rotated

No, if you save your video with flag = "Do not rotate" as in the attached image, Avidemux will open it non-rotated.

[eumagga0x2a]

Avidemux always displays video as coded. This is by design. Any transformation metadata like rotation or pixel aspect ratio are ignored. If you merge videos coded in different orientation, the result will be always broken. You absolutely must re-encode some of the videos to unify the orientation.

[Drakon66]

Thank you guys it explain me a lot.
So there is no chance for any upadte to add option rotate display video ?
Then I cound work by incremental creating video.
I am trainspotter and once time record video from left window of train and once time from right. And i try to create complete one with no re-encode. After re-encode video with less quality.
Or you can advise what to do to have result video with size = Vid1 + Vid2 [Megabajt].
Re-encode create result_size != Vid1 + Vid2

[Geo_log]

once time record video from left window of train and once time from right

And why is your 1st (or 2nd?) scene upside down?

what to do to have result video with size = Vid1 + Vid2 [Megabajt].

1) Append 2nd video;
2) "Video Output" -> "Configure" -> Encoding Mode = Video Size (Two Pass) = Vid1 + Vid2 [Mb];
3) Save video.

[eumagga0x2a]

So there is no chance for any upadte to add option rotate display video ?

Please don't mix up different things. An enhancement to Avidemux to allow user to rotate video preview is possible (this would facilitate editing of videos where the picture orientation doesn't match the coded orientation). This has nothing to do with any rotation of the output.

You also can configure the MP4 or MOV muxer in Avidemux when saving to MP4 / MOV (the only formats supporting this feature) to ask video player to rotate video display – this applies to the entire video, not to a segment thereof.

But if you append videos coded in different orientations, it is impossible to unify the orientation without re-encoding segments coded in a wrong orientation. This is not an Avidemux limitation.

After re-encode video with less quality.

Yes, it will, but moderately. Please make sure that "Post-Processing" is disabled in Avidemux. It is disabled by default, but if the user inherits a very old Avidemux profile from the long passed times as this setting defaulted to being enabled, it will be enabled, ruining the quality.

Please also consider using a lossless codec (Ut Video or (FF)HuffYUV) for intermediate steps.

Or you can advise what to do to have result video with size = Vid1 + Vid2 [Megabajt].

This is not directly related to quality being the same. Choose constant quality mode with rate factor between 15 and 20 for H.264 or between 20 and 25 for HEVC. This should give a reasonable balance between bitrate and quality.

[Drakon66]

An enhancement to Avidemux to allow user to rotate video preview is possible

how to set that

Please make sure that "Post-Processing" is disabled in Avidemux

lease also consider using a lossless codec (Ut Video or (FF)HuffYUV) for intermediate steps.

Where check this

[Drakon66]

My problem is i have some videos upside down 180 recorded. I hope option with reencoding not reduce quality. Its just coding frame problem.

[Geo_log]

I hope option with reencoding not reduce quality.

- did you try this?:

1) Append 2nd video;
2) "Video Output" -> "Configure" -> Encoding Mode = Video Size (Two Pass) = Vid1 + Vid2 [Mb];
3) Save video.

How good or bad is the resulting quality?

[Drakon66]

Attach photo after and before. After re-econde quality is worse. Respond to Geo_Log.