Re: stabilize jumpy video

On Sat, 10/19/2024 1:59 PM, Oliver wrote:

On Sat, 19 Oct 2024 06:44:36 -0400, Paul <nospam@needed.invalid> wrote

   ffmpeg -i input.mp4 -vf deshake output.mp4
>
Check the resolution of the input video, versus that
of the output video.

 
That worked well enough. Thanks. I'll use that to clean up video shaking.
 
It's easy to do, but it increased the size of the video by a third.
But the resolution was fine, visually (see details below).
 
The main negative is there was a slight artifact of an angled line in the
bottom of the output video that seems to have been introduced by ffmpeg.
 
I only did it once though, and on a relatively large 1-1/2 hour long video:
ffmpeg -i input.mp4 -vf deshake output.mp4
where here are the before and after file sizes:
10/18/2024  06:39 PM       270,732,733 input.mp4
10/19/2024  12:12 PM       347,497,221 output.mp4
 
The resulting visual resolution looked just fine to me, so other than the
strange artifact (which could be data related for all I know as I only ran
this single test before thanking you), it was a win because it's so easy.
 
Looking at the details inside of Media Info, input.mp4 is reported as
First video stream 313kb/s, 788*444 (16:9) at 25,000 FPS,                    AVC (High@L3)(CABAC / 5 Ref Frames)
First audio stream 61.1 kb/s, 44.1 kHz, 1 channel, AAC LC
 
Where output.mp4 is only slightly different in MediaInfo reports as
First video stream 416kb/s, 788*444 (16:9) at 25,000 FPS,                    AVC (High@L3)(CABAC / 4 Ref Frames)
First audio stream 66.2 kb/s, 44.1 kHz, 1 channel, AAC LC
 
EVERYTHING BELOW IS THE FFMPEG LOG OUTPUT
 
ffmpeg -i input.mp4 -vf deshake output.mp4
ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 9.3.1 (GCC) 20200523
 configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-fontconfig --enable-gnutls --enable-iconv --enable-libass
--enable-libdav1d --enable-libbluray --enable-libfreetype
--enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp
--enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc
--enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom
--enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid
--enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2
--enable-avisynth --enable-libopenmpt
 libavutil      56. 31.100 / 56. 31.100
 libavcodec     58. 54.100 / 58. 54.100
 libavformat    58. 29.100 / 58. 29.100
 libavdevice    58.  8.100 / 58.  8.100
 libavfilter     7. 57.100 /  7. 57.100
 libswscale      5.  5.100 /  5.  5.100
 libswresample   3.  5.100 /  3.  5.100
 libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
   encoder         : Lavf58.12.100
 Duration: 01:34:44.25, start: 0.000000, bitrate: 381 kb/s
   Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
788x444, 313 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
   Metadata:
     handler_name    : VideoHandler
   Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono,
fltp, 61 kb/s (default)
   Metadata:
     handler_name    : SoundHandler
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
 Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0000023bbadce0c0] using cpu capabilities: MMX2 SSE2Fast LZCNT
[libx264 @ 0000023bbadce0c0] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 0000023bbadce0c0] 264 - core 160 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1
ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00
mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11
fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1
sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0
constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1
weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40
intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0
qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4':
 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
   encoder         : Lavf58.29.100
   Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p,
788x444, q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
   Metadata:
     handler_name    : VideoHandler
     encoder         : Lavc58.54.100 libx264
   Side data:
     cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
   Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono,
fltp, 69 kb/s (default)
   Metadata:
     handler_name    : SoundHandler
     encoder         : Lavc58.54.100 aac
frame=142105 fps= 25 q=-1.0 Lsize=  339348kB time=01:34:44.22 bitrate=
489.1kbits/s speed=1.02x
video:288672kB audio:46031kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 1.387617%
[libx264 @ 0000023bbadce0c0] frame I:904   Avg QP:18.54  size: 15601
[libx264 @ 0000023bbadce0c0] frame P:49446 Avg QP:20.64  size:  3873
[libx264 @ 0000023bbadce0c0] frame B:91755 Avg QP:25.71  size:   981
[libx264 @ 0000023bbadce0c0] consecutive B-frames:  1.5% 36.5%  2.5% 59.6%
[libx264 @ 0000023bbadce0c0] mb I  I16..4: 18.8% 70.8% 10.3%
[libx264 @ 0000023bbadce0c0] mb P  I16..4:  3.4%  6.8%  0.4%  P16..4: 39.9%
10.1%  3.7%  0.0%  0.0%    skip:35.7%
[libx264 @ 0000023bbadce0c0] mb B  I16..4:  0.3%  0.5%  0.0%  B16..8: 29.7%
2.3%  0.2%  direct: 0.6%  skip:66.4%  L0:39.2% L1:58.6% BI: 2.2%
[libx264 @ 0000023bbadce0c0] 8x8 transform intra:64.2% inter:83.1%
[libx264 @ 0000023bbadce0c0] coded y,uvDC,uvAC intra: 35.0% 60.9% 13.1%
inter: 5.7% 12.1% 0.1%
[libx264 @ 0000023bbadce0c0] i16 v,h,dc,p: 23% 25%  8% 43%
[libx264 @ 0000023bbadce0c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 20% 25%  4%
6%  6%  6%  6%  5%
[libx264 @ 0000023bbadce0c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 27% 15%  4%
8%  7%  8%  5%  4%
[libx264 @ 0000023bbadce0c0] i8c dc,h,v,p: 54% 21% 18%  7%
[libx264 @ 0000023bbadce0c0] Weighted P-Frames: Y:2.3% UV:0.4%
[libx264 @ 0000023bbadce0c0] ref P L0: 70.1% 10.3% 14.7%  4.8%  0.1%
[libx264 @ 0000023bbadce0c0] ref B L0: 91.9%  6.8%  1.3%
[libx264 @ 0000023bbadce0c0] ref B L1: 97.6%  2.4%
[libx264 @ 0000023bbadce0c0] kb/s:416.03
[aac @ 0000023bbadcfc00] Qavg: 3536.932

You may have to inspect individual frames from each video,
to see why the output video is less compressible.

See if the sharpness is visibly different.

   Paul