使用ffmpeg剪切视频时出现空流
当我尝试剪切视频时,它会输出一个空流(262字节的视频,持续时间为0秒)。如果您有任何见解,我将不胜感激,谢谢 使用的命令:使用ffmpeg剪切视频时出现空流,ffmpeg,Ffmpeg,当我尝试剪切视频时,它会输出一个空流(262字节的视频,持续时间为0秒)。如果您有任何见解,我将不胜感激,谢谢 使用的命令: ffmpeg-i/path/to/long/video.mp4-ss37.69-t4.96-c copy/path/to/short/video.mp4 但是,当我执行以下(更不准确的)命令时,它会输出一个视频。此视频也有一些问题,因为最后一帧重复了几次,使视频长了一秒钟(冻结图像长了一秒钟) ffmpeg-ss37.69-i/path/to/long/video.mp4
ffmpeg-i/path/to/long/video.mp4-ss37.69-t4.96-c copy/path/to/short/video.mp4
但是,当我执行以下(更不准确的)命令时,它会输出一个视频。此视频也有一些问题,因为最后一帧重复了几次,使视频长了一秒钟(冻结图像长了一秒钟)
ffmpeg-ss37.69-i/path/to/long/video.mp4-t4.96-c copy/path/to/short/video.mp4
ffmpeg版本:ffmpeg版本3.4.6-0ubuntu0.18.04.1
这两个命令的输出为:
第一命令:
built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/proj/vondrick/datasets/HowTo100M/video/Cars_&_Other_Vehicles/Motorcycles/52907/video_nVbIUDjzWY4.mp4':
Metadata:
major_brand : dash
minor_version : 0
compatible_brands: iso6avc1mp41
creation_time : 2015-06-26T00:39:04.000000Z
Duration: 00:07:14.40, start: 0.000000, bitrate: 244 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 426x240 [SAR 1:1 DAR 71:40], 2 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc (default)
Metadata:
creation_time : 2015-06-26T00:39:04.000000Z
handler_name : VideoHandler
Output #0, mp4, to '/proj/vondrick/datasets/HowTo100M/cropped_video/Cars_&_Other_Vehicles/Motorcycles/52907/nVbIUDjzWY4/video_000000_p.mp4':
Metadata:
major_brand : dash
minor_version : 0
compatible_brands: iso6avc1mp41
encoder : Lavf57.83.100
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 426x240 [SAR 1:1 DAR 71:40], q=2-31, 2 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc (default)
Metadata:
creation_time : 2015-06-26T00:39:04.000000Z
handler_name : VideoHandler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame= 0 fps=0.0 q=-1.0 Lsize= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
第二命令:
ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/proj/vondrick/datasets/HowTo100M/video/Cars_&_Other_Vehicles/Motorcycles/52907/video_nVbIUDjzWY4.mp4':
Metadata:
major_brand : dash
minor_version : 0
compatible_brands: iso6avc1mp41
creation_time : 2015-06-26T00:39:04.000000Z
Duration: 00:07:14.40, start: 0.000000, bitrate: 244 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 426x240 [SAR 1:1 DAR 71:40], 2 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc (default)
Metadata:
creation_time : 2015-06-26T00:39:04.000000Z
handler_name : VideoHandler
Output #0, mp4, to '/proj/vondrick/datasets/HowTo100M/cropped_video/Cars_&_Other_Vehicles/Motorcycles/52907/nVbIUDjzWY4/video_000000_3.mp4':
Metadata:
major_brand : dash
minor_version : 0
compatible_brands: iso6avc1mp41
encoder : Lavf57.83.100
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 426x240 [SAR 1:1 DAR 71:40], q=2-31, 2 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc (default)
Metadata:
creation_time : 2015-06-26T00:39:04.000000Z
handler_name : VideoHandler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame= 159 fps=0.0 q=-1.0 Lsize= 159kB time=00:00:04.95 bitrate= 263.0kbits/s speed=1.89e+03x
video:158kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.909119%
两个问题:
-c copy
)时,不能保证剪切的准确性,因为它需要包括解码段所需的所有其他帧。因此,要么剪切关键帧,要么通过删除-c copy
重新编码将时间转换为时间码时会发生什么?我通常是这样剪的
-ss00:00:37-t00:00:04
。如果您需要剪切到特定帧,ffmpeg还有其他选项,但需要更长时间,因为它逐帧搜索。您也可以尝试使用-to
选项,如果使用您建议的时间码格式时,时间码工作量过大,则我会得到相同的结果,即输出流为空。这是否回答了您的问题?