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From: Paul <nospam@needed.invalid>
Newsgroups: alt.comp.os.windows-10,rec.photo.digital
Subject: Re: stabilize jumpy video
Date: Sat, 19 Oct 2024 15:16:54 -0400
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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