问题描述
ffmpeg -ss 60 -i video.mov -vframes 1 a.jpg
产生以下内容:
我尝试操纵pix_fmt
和q:v 2
的质量无济于事。请注意,视频中的其他位置(即不是60秒,而是之前或之后),看不到任何此类伪像。
有所帮助的一件事是平均多个帧(从here改用15帧):
-vf tmix=frames=15:weights="1 1 1 1 1 1 1 1 1 1 1 1 1 1 1",select='not(mod(n\,15))'
看起来更好: 但是仍然需要花费整整15帧的时间,您仍然可以看到这些工件。
是否有更好的方法来处理这种噪音?
提前谢谢!
这是该视频的统计信息:
ffmpeg version n4.3.1 copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10.1.0 (GCC)
configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
Input #0,mov,mp4,m4a,3gp,3g2,mj2,from 'Downloads/20191130_1h_ICE_2.6m_B9.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2020-03-29T09:24:30.000000Z
Duration: 00:07:04.83,start: 0.000000,bitrate: 9891 kb/s
Stream #0:0(und): Audio: aac (mp4a / 0x6134706D),48000 Hz,5.1,fltp,260 kb/s (default)
Metadata:
creation_time : 2020-03-29T09:24:30.000000Z
handler_name : Core Media Audio
Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661),yuv420p(tv,bt709),1920x1080 [SAR 1:1 DAR 16:9],9632 kb/s,24.38 fps,25 tbr,90k tbn,180k tbc (default)
Metadata:
creation_time : 2020-03-29T09:24:30.000000Z
handler_name : Core Media Video
encoder : H.264
File 'a.jpg' already exists. Overwrite? [y/N] y
Stream mapping:
Stream #0:1 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop,[?] for help
[swscaler @ 0x55a5393a9a40] deprecated pixel format used,make sure you did set range correctly
Output #0,image2,to 'a.jpg':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
encoder : Lavf58.45.100
Stream #0:0(und): Video: mjpeg,yuvj420p(pc),q=2-31,200 kb/s,25 fps,25 tbn,25 tbc (default)
Metadata:
creation_time : 2020-03-29T09:24:30.000000Z
handler_name : Core Media Video
encoder : Lavc58.91.100 mjpeg
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame= 1 fps=0.0 q=9.3 Lsize=N/A time=00:00:00.04 bitrate=N/A dup=1 drop=1 speed=0.0984x
video:207kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unkNown
解决方法
暂无找到可以解决该程序问题的有效方法,小编努力寻找整理中!
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