[FFmpeg-user] Rotating output in transcode pipeline with C

[Jim Worrall]

Oh, if you need to remove the metadata, assuming the rotation metadata
belongs to the stream, add -map_metadata:s -1 to the command, or just
-map_metadata -1 to remove all metadata, stream or global.

On Wed, Dec 14, 2016 at 4:05 PM, Jim Worrall <coniophora at gmail.com> wrote:

> I don't fully understand your question, but you can rotate video clockwise
> 90* as you input it by adding -vf "transpose=1" before -i
>
> -vf transpose=2 should rotate it counter-clockwise.
>
> On Tue, Dec 13, 2016 at 8:28 AM, Victor dMdB <ffmpeg at eml.cc> wrote:
>
>> Hi!
>>
>> I have an input stream which comes from a mobile device, and therefore
>> has rotation metadata and side_data display matrix.
>>
>> I would like to transcode this, then output a stream, physically rotated
>> without metadata.
>>
>> Do I have to use avfilter? Or can I set a parameter in avformatcontext
>> to transpose it?
>>
>> I've tried setting the output side_data, but would prefer directly
>> output the rotated frames.
>>
>> Thanks in advance for the help!
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>
>