主页 / user-1182869

Faisal's questions

Martin Hope
Faisal
Asked: 2020-06-02 06:21:35 +0800 CST
  • 58

FFmpeg wiki说最好的压缩率是预设的“veryslow” 。

但是当我用我的视频尝试它时，预设veryfast在我的情况下提供了最好的压缩。

以下是我的样本的输出：

预设ultrafast

ffmpeg -y -threads 1 -i "D:\Video\PresentTest\Safari_Dolby_Digital_Plus.m2ts.mp4" -c:v libx264 -preset ultrafast -c:a aac  -max_muxing_queue_size 1024 "D:\Video\PresentTest\Safari_Dolby_Digital_Plus-ultrafast.mp4"

frame= 2822
fps= 65
q=-1.0
Lsize=
239118kB
time=00:01:34.18
bitrate=20797.6kbits/s
speed=2.16x

预设superfast

ffmpeg -y -threads 1 -i "D:\Video\PresentTest\Safari_Dolby_Digital_Plus.m2ts.mp4" -c:v libx264 -preset superfast -c:a aac  -max_muxing_queue_size 1024 "D:\Video\PresentTest\Safari_Dolby_Digital_Plus-superfast.mp4"

frame= 2822
fps= 63
q=-1.0
Lsize=  150252kB
time=00:01:34.18
bitrate=13068.3kbits/s
speed=2.09x

预设veryfast

ffmpeg -y -threads 1 -i "D:\Video\PresentTest\Safari_Dolby_Digital_Plus.m2ts.mp4" -c:v libx264 -preset veryfast -c:a aac  -max_muxing_queue_size 1024 "D:\Video\PresentTest\Safari_Dolby_Digital_Plus-veryfast.mp4"

frame= 2822
fps= 62
q=-1.0
Lsize=
115997kB
time=00:01:34.18
bitrate=10089.0kbits/s
speed=2.08x

预设fast

ffmpeg -y -threads 1 -i "D:\Video\PresentTest\Safari_Dolby_Digital_Plus.m2ts.mp4" -c:v libx264 -preset fast -c:a aac  -max_muxing_queue_size 1024 "D:\Video\PresentTest\Safari_Dolby_Digital_Plus-fast.mp4"

frame= 2822
fps= 52
q=-1.0
Lsize=
133773kB
time=00:01:34.18
bitrate=11635.1kbits/s
speed=1.72x

预设medium

ffmpeg -y -threads 1 -i "D:\Video\PresentTest\Safari_Dolby_Digital_Plus.m2ts.mp4" -c:v libx264 -preset medium -c:a aac  -max_muxing_queue_size 1024 "D:\Video\PresentTest\Safari_Dolby_Digital_Plus-medium.mp4"

frame= 2822
fps= 43
q=-1.0
Lsize=
124154kB
time=00:01:34.18
bitrate=10798.4kbits/s
speed=1.42x

预设slow

ffmpeg -y -threads 1 -i "D:\Video\PresentTest\Safari_Dolby_Digital_Plus.m2ts.mp4" -c:v libx264 -preset slow -c:a aac  -max_muxing_queue_size 1024 "D:\Video\PresentTest\Safari_Dolby_Digital_Plus-slow.mp4"

frame= 2822
fps= 27
q=-1.0
Lsize=  125262kB
time=00:01:34.18
bitrate=10894.8kbits/s
speed=0.886x

预设slower

ffmpeg -y -threads 1 -i "D:\Video\PresentTest\Safari_Dolby_Digital_Plus.m2ts.mp4" -c:v libx264 -preset slower -c:a aac  -max_muxing_queue_size 1024 "D:\Video\PresentTest\Safari_Dolby_Digital_Plus-slower.mp4"

frame= 2822
fps= 14
q=-1.0
Lsize=  125061kB
time=00:01:34.18
bitrate=10877.3kbits/s
speed=0.465x

预设veryslow

ffmpeg -y -threads 1 -i "D:\Video\PresentTest\Safari_Dolby_Digital_Plus.m2ts.mp4" -c:v libx264 -preset veryslow -c:a aac  -max_muxing_queue_size 1024 "D:\Video\PresentTest\Safari_Dolby_Digital_Plus-veryslow.mp4"

frame= 2822
fps=6.6
q=-1.0
Lsize=  118149kB
time=00:01:34.18
bitrate=10276.2kbits/s
speed=0.221x

veryfast与其他预设相比，为什么预设生成的压缩文件最多？

视频丢失是预设的veryfast吗？

video ffmpeg