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• avcodec/mpegvideo_enc : Check FLV1 resolution limits

  8 janvier, par Michael Niedermayer

  avcodec/mpegvideo_enc : Check FLV1 resolution limits
  Found-by : Elias Myllymäki <elias.myllymaki04p@gmail.com>
  
  Reviewed-by : Alexander Strasser <eclipse7@gmx.net>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mpegvideo_enc.c

• Is Replacing Dynamic Resolution with scale_amf in FFmpeg Command a Good Direction ?

  21 novembre 2024, par fred

  I'm working on a Lua script for MPV that processes 360-degree videos using FFmpeg's v360 filter. The original command dynamically calculates the output resolution based on a res variable, like this :

  


  mp.command_native_async({
    "no-osd", "vf", "add", 
    string.format(
        "@vrrev:v360=%s:%s:reset_rot=1:in_stereo=%s:out_stereo=2d:
id_fov=%s:d_fov=%.3f:yaw=%.3f:pitch=%s:roll=%.3f:
w=%s*192.0:h=%.3f*108.0:h_flip=%s:interp=%s",
        in_flip, inputProjection, outputProjection, in_stereo, idfov, dfov, yaw, pitch, roll, res, res, h_flip, scaling
    )
}, updateComplete)


  


  Change Proposal :

  


  I am considering replacing the dynamic width and height calculations with a scale_amf filter to handle scaling more efficiently and leverage GPU acceleration. The updated command would look like this :

  


  mp.command_native_async({
    "no-osd", "vf", "add", 
    string.format(
        "@vrrev:v360=%s:%s:reset_rot=1:in_stereo=%s:out_stereo=2d:
id_fov=%s:d_fov=%.3f:yaw=%.3f:pitch=%s:roll=%.3f,
%sscale_amf=w=%.0f:h=%.0f",
        inputProjection, outputProjection, in_stereo, idfov, dfov, yaw, pitch, roll, in_flip, res * 192.0, res * 108.0
    )


  


  Hardware Specifications :

  


  I am using an AMD Ryzen 5 5600G, no display card, 16GB RAM, Windows 10.

  


  Questions :

  


  Is using scale_amf for scaling a good direction in terms of performance and efficiency ?
Are there any potential drawbacks to this approach that I should be aware of ?
How does using scale_amf compare to the original dynamic resolution method in terms of output quality and processing speed ?
}, updateComplete)

  


  Any insights or experiences with this change would be greatly appreciated !

  


• ffmpeg ignores input svg files resolution and produces 100x100 video [closed]

  11 novembre 2024, par Francesco Potortì

  I have used this command for some years to produce .ogg files (or any other format) from a series of .svg files on Linux :

  


  ffmpeg -y -r 1.2 -i %06d.svg -qscale:v 10 path.ogg

  


  It has worked flawlessly until now, when it produces a video with 100x100 resolution, rather then the 1920x1080 resolution of the input files.

  


  If I force the output resolution to be 1920x1080 using the -s option, the resulting video is a magnified version of the 100x100 video output I obtain without the -s option. If I convert the svg files to png using inkscape everything is well, but I'd like to avoid making my workflow more complex.

  


  Here you can find some of the .svg files.

  


  Any ideas ?