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RecipeDan asked on

convert .mp4 to .webm

Hello:

The newest Android phones that output .mp4 videos when converted to .webm the video flips upside down. Is there a way to tell a regular .mp4 video and a .mp4 video taken from an Android phone?

Dan
Multimedia ProgrammingMultiMedia ApplicationsAndroid

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Charlene Figer

8/22/2022 - Mon
Merete

Hi Dan,
What media player are you using?
Upside down video playback can be caused by several things.
why use> .webm
A valid WebM file can only contain VP8 video and Vorbis audio in a .webm container
http://www.webmproject.org/about/faq/
Try Gspot~> Is there a way to tell a regular .mp4 video and a .mp4 video taken from an Android phone?
GSpot establishes what video and audio codecs are required to play any video. Shows framerate, duration, aspect ratio, bitrates, structure info, and more. Supports AVI, MPG, VOB, DVD, VCD, SVCD, MP4, FLV, MOV, QT, RM, SWF, WMV, ASF.
http://www.videohelp.com/tools/GSpot
Borrowed answer I sourced from here
Android Camera recording video but plays upside down
Motorola phones have problem in playing the video which is recorded in portrait mode.
In order to overcome the rotation of the video, the best solution I have adopted was to upload the video to the server and run ffmpeg on using the command ffmpeg -i input.mp4 -c:v mpeg4 -c:a copy -c:s copy -vf "transpose=2" output.mp4

ffmpeg
http://www.videohelp.com/tools?toolsearch=ffmpeg&submit=Search&convert=&s=&orderby=Name&hits=50
ASKER
RecipeDan

I created my own video player in HTML5. I took a video using my Samsung Note 3 and when I converted it to .webm using FFMPEG it converted ok but flipped upside down. When I tested another .mp4 video that I downloaded from the web it converted ok with no issues.

I am familiar with the issues with phones and trying to convert the video into different formats.

I am trying to figure out if someone uploaded a video, how would I know if it was taken with a phone, camcorder, or something else?
ASKER CERTIFIED SOLUTION
Merete

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ASKER
RecipeDan

Thank you for your assistance.
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Merete

Glad to have helped thankyou
Charlene Figer

There is another way to solve your issue.

First get a tool to rotate your source MP4 files and then convert MP4 to WebM format.

To accomplish the above two tasks, personally recommend a detailed guide here.

The guide introduces a powerful tool to convert MP4 to WebM.  The tool mentioned in the guide also has the feature of rotating video.