[FFmpeg-user] Vertically flipped mp4 video

[Ulf Zibis]

Am 28.06.22 um 17:01 schrieb Gyan Doshi:
> That's a H.264 bitstream filter. It can only be used on H.264 video streams.
This is the case here.

> Basic syntax is
>
>      ffmpeg -i input -c copy -bsf:v h264_metadata=display_orientation=insert:flip=horizontal output

Much thanks for this syntax.

Unfortunately it does nothing, even as the predicted Output.

With this syntax
$ ffmpeg -i input.mp4  -c copy -metadata:s:v:0 display_orientation=insert:flip=horizontaloutput.mp4
I get at least for the predicted output (which looks weird):
[.....]
Output #0, mp4, to 'output.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf59.16.100
   Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 854x480 [SAR 320:427 DAR 4:3], q=2-31, 686 kb/s, 24 fps, 24 tbr, 12288 tbn (default)
     Metadata:
       handler_name    : VideoHandler
       vendor_id       : [0][0][0][0]
       display_orientation: insert:flip=horizontal
   Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 56 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
       vendor_id       : [0][0][0][0]
[.....]

But the metadata tag is still missing in the result, verified by ffprobe.

So I still think, there is a mistake in the documentation.
Can one please proof this?

-Ulf