我尝试使用ffmpeg从水下测量视频中提取帧。 提取的帧应在该过程的稍后阶段根据时间戳与 GPS 位置合并。 我用来提取帧的代码是：
ffmpeg -i GOPR0173.MP4 -qscale:v 2 -r 1 frames/%4d.jpg.
我需要一个解决方案来根据调查日期时间获取帧的真实时间戳，以便帧的时间戳等于创建视频时的实时时间。理想情况下，时间戳保存在图像exif中，或者如果无法将其保存在单独的文本文件中，并且时间戳用作2020_01_01_HH_MM_SS.jpg等文件的名称。
我的想法是使用视频的creation_time将帧的时间戳添加到此帧中，并将结果存储在提取帧的 exif 中，或者如果这不可能在 txt 文件中存储。
我是 ffmpeg 的新手，真的很迷路，希望能帮助解决这项任务！ 如果有人能为我提供必要的代码，那就太棒了！
C:Unterwasserfotos>ffmpeg -i GOPR0173.MP4 -vstats -qscale:v 2 -r 0.1 frames/%4d.jpg
ffmpeg version git-2020-01-21-fc6fde2 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.2.1 (GCC) 20200122
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls
--enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enabl
e-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-
libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwol
ame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enab
le-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-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enabl
e-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 38.100 / 56. 38.100
libavcodec 58. 66.100 / 58. 66.100
libavformat 58. 35.104 / 58. 35.104
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 71.100 / 7. 71.100
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'GOPR0173.MP4':
Metadata:
major_brand : mp41
minor_version : 538120216
compatible_brands: mp41
creation_time : 2020-01-21T12:33:10.000000Z
firmware : HD4.02.05.00.00
Duration: 00:02:21.85, start: 0.000000, bitrate: 30152 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1920x1080 [SAR
1:1 DAR 16:9], 30000 kb/s, 50 fps, 50 tbr, 90k tbn, 100 tbc (default)
Metadata:
creation_time : 2020-01-21T12:33:10.000000Z
handler_name : GoPro AVC
encoder : GoPro AVC encoder
timecode : 12:33:11:16
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (defa
ult)
Metadata:
creation_time : 2020-01-21T12:33:10.000000Z
handler_name : GoPro AAC
timecode : 12:33:11:16
Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
Metadata:
creation_time : 2020-01-21T12:33:10.000000Z
handler_name : GoPro TCD
timecode : 12:33:11:16
Stream #0:3(eng): Data: none (fdsc / 0x63736466), 12 kb/s (default)
Metadata:
creation_time : 2020-01-21T12:33:10.000000Z
handler_name : GoPro SOS
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'frames/%4d.jpg':
Metadata:
major_brand : mp41
minor_version : 538120216
compatible_brands: mp41
firmware : HD4.02.05.00.00
encoder : Lavf58.35.104
Stream #0:0(eng): Video: mjpeg, yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s,
0.10 fps, 0.10 tbn, 0.10 tbc (default)
Metadata:
creation_time : 2020-01-21T12:33:10.000000Z
handler_name : GoPro AVC
timecode : 12:33:11:16
encoder : Lavc58.66.100 mjpeg
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame= 16 fps=0.3 q=2.0 Lsize=N/A time=00:02:40.00 bitrate=N/A dup=0 drop=7076 speed=3.26x
video:1938kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown´´´
这是我任务的解决方案。核心组件是我发现并采用的很好的批处理脚本(见下文(。
- 将程序exiftool，ffmpeg，Namexif，GeoSetter，批处理脚本和视频文件放在一个文件夹中。
- 使用Mediainfo从 gopro 视频文件中读取时间戳。
- 在批处理脚本中插入视频文件名和时间戳(第 34 和 63 行(
- 运行批处理脚本以每秒提取一帧(时间戳放置在exif中(
- 使用GeoSetter将帧与.gpx文件合并(坐标放置在 exif 中(
- 使用Namexif将帧的文件名替换为基于其 exif 的日期和时间
批处理脚本：
@echo off
rem Ksheesh Geotag Video Frames 0.0.1
rem
rem Extract frames from video every X seconds and geotag them using GPS data file.
rem Requires exiftool and ffmpeg.
rem Copyright (c) 2017 krzysiu.net
rem
rem Permission is hereby granted, free of charge, to any person obtaining a copy
rem of this software and associated documentation files (the "Software"), to deal
rem in the Software without restriction, including without limitation the rights
rem to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
rem copies of the Software, and to permit persons to whom the Software is
rem furnished to do so, subject to the following conditions:
rem
rem The above copyright notice and this permission notice shall be included in all
rem copies or substantial portions of the Software.
rem
rem THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
rem IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
rem FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
rem AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
rem LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
rem OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
rem SOFTWARE.
setlocal EnableDelayedExpansion
rem Config starts here. Remember:
rem * Paths and names: don't use quotes, even if it has spaces in the string.
rem * Binaries: if they are in shared path, you may set just the binary name,
rem i.e. "ffmpeg" (without quotes) for ffmpegBin variable.
rem Input video file
set videoFile=GOPR0173.MP4
rem Prefix which will be added to image file names
set framePrefix=frame_
rem Output directory for frame images (must exist; without trailing slash)
set outputDirectory=%cd%
rem Path to ffmpeg binary.
set ffmpegBin=ffmpeg.exe
rem Path to exiftool binary.
set exiftoolBin=exiftool.exe
rem Padding digit count (1-9) in frame file names (i.e. 3 will make 001.jpg and 2 will make 01.jpg)
set paddingDigits=4
rem Get frame every X seconds.
set getFrameEvery=1
rem Date and time of the start of the video. You may use:
rem * DateTimeOriginal - if the file has DateTimeOriginal tag
rem * FileCreateDate - set timestamp to file creation date
rem * FileModifyDate - set timestamp to file modify date
rem * 0 - own timestamp (see videoTimestamp variable)
set dateSource=0
rem If dateSource is set to 0, set here date and time of the start of the video.
rem The format is yyyy:mm:dd hh:mm:ss
set videoTimestamp=2020:01:21 13:28:33
rem The source of GPS data, i.e. GPX or other supported file. Wildcards are also
rem possible, e.g. gpsDataFile=c:gps_data*.gpx
set gpsDataFile=2020-01-21_gps.gpx
rem Config ends here.
set exifDateParam=-tagsFromFile "%videoFile%" "-datetimeoriginal<%dateSource%"
if %dateSource% equ 0 set exifDateParam="-datetimeoriginal=%videoTimestamp%Z"
if not exist "%outputDirectory%" (
set errMsg=Can't access output directory ^(%outputDirectory%^)
goto error
)
if not exist "%videoFile%" (
set errMsg=Can't access video file ^(%videoFile%^)
goto error
)
pushd %outputDirectory%
echo Extracting frames...
%ffmpegBin% -loglevel error -hide_banner -stats -i "%videoFile%" -qscale:v 2 -vf fps=fps=1/%getFrameEvery%:start_time=0:round=zero %framePrefix%%%0%paddingDigits%d.jpg
if %errorlevel% neq 0 (
set errMsg=ffmpeg returned error
goto error
)
echo Done!
echo.
echo Setting base timestamp to files.
set fileNumber=0
%exiftoolBin% %exifDateParam% -overwrite_original -globaltimeshift "+0:0:0 0:0:!timeShift!" "%framePrefix%*.jpg"
echo Done!
echo.
echo Setting timestamp offsets.
for %%f in ("%framePrefix%*.jpg") do (
set /a "timeShift=!fileNumber!*%getFrameEvery%"
if !fileNumber! neq 0 %exiftoolBin% -P -m -overwrite_original "-datetimeoriginal+=0:0:0 0:0:!timeShift!" "%%~nxf"
set /a "fileNumber=!fileNumber!+1"
)
echo Done!
echo.
goto theend
:error
echo %errMsg%. Exitting.
:theend
pause
popd
endlocal
我还修改了上面的代码。 它现在接受命令行参数，这些参数允许通过使用电子表格将命令行拼凑在一起来自动处理多个mp4文件。
针对未压缩的 TIFF(大文件(进行了修改
语法：batchfilename.bat path(with terminating backslash) filename(without extension, currently assumed to be MP4) number_of_seconds_between_frames(numeric) date(xxxx:xx:xx year:month:day) time(xx:xx:xx.x)
xxxx.bat code:
@echo off
rem Ksheesh Geotag Video Frames 0.0.1
rem MODIFIED FOR UNCOMPRESSED TIFF USING COMMAND LINE PARAMETERS
rem SYNTAX: batchfilename.bat path(with terminating backslash) filename(without extension, currently
rem assummed to be MP4) number_of_seconds_between_frames(numeric) date(xxxx:xx:xx year:month
rem :day) time(xx:xx:xx.x)
rem
rem Extract frames from video every X seconds and geotag them using GPS data file.
rem Requires exiftool and ffmpeg.
rem Copyright (c) 2017 krzysiu.net
rem
rem Permission is hereby granted, free of charge, to any person obtaining a copy
rem of this software and associated documentation files (the "Software"), to deal
rem in the Software without restriction, including without limitation the rights
rem to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
rem copies of the Software, and to permit persons to whom the Software is
rem furnished to do so, subject to the following conditions:
rem
rem The above copyright notice and this permission notice shall be included in all
rem copies or substantial portions of the Software.
rem
rem THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
rem IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
rem FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
rem AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
rem LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
rem OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
rem SOFTWARE.
setlocal EnableDelayedExpansion
rem Config starts here. Remember:
rem * Paths and names: don't use quotes, even if it has spaces in the string.
rem * Binaries: if they are in shared path, you may set just the binary name,
rem i.e. "ffmpeg" (without quotes) for ffmpegBin variable.
rem Input video file
set videoFile=%1%2.mp4
rem Prefix which will be added to image file names
set framePrefix=%2GEO_
echo %framePrefix%
rem Output directory for frame images (must exist; without trailing slash)
set outputDirectory=%1GPStiff
md "%outputDirectory%"
rem Path to ffmpeg binary.
set ffmpegBin=q:dronedjimp3tiffffmpeg.exe
rem Path to exiftool binary.
set exiftoolBin=q:dronedjimp3tiffexiftool.exe
rem Padding digit count (1-9) in frame file names (i.e. 3 will make 001.jpg and 2 will make 01.jpg)
set paddingDigits=4
rem Get frame every X seconds.
set getFrameEvery=%3
rem Date and time of the start of the video. You may use:
rem * DateTimeOriginal - if the file has DateTimeOriginal tag
rem * FileCreateDate - set timestamp to file creation date
rem * FileModifyDate - set timestamp to file modify date
rem * 0 - own timestamp (see videoTimestamp variable)
set dateSource=0
rem If dateSource is set to 0, set here date and time of the start of the video.
rem The format is yyyy:mm:dd hh:mm:ss
rem set videoTimestamp=2021:10:21 20:30:26.7
set videoTimestamp=%4 %5
rem The source of GPS data, i.e. GPX or other supported file. Wildcards are also
rem possible, e.g. gpsDataFile=c:gps_data*.gpx
set gpsDataFile=%1%2.gpx
rem Config ends here.
set exifDateParam=-tagsFromFile "%videoFile%" "-datetimeoriginal<%dateSource%"
if %dateSource% equ 0 set exifDateParam="-datetimeoriginal=%videoTimestamp%Z"
if not exist "%outputDirectory%" (
set errMsg=Can't access output directory ^(%outputDirectory%^)
goto error
)
if not exist "%videoFile%" (
set errMsg=Can't access video file ^(%videoFile%^)
goto error
)
pushd %outputDirectory%
echo Extracting frames...
%ffmpegBin% -loglevel error -hide_banner -stats -i "%videoFile%" -vf fps=fps=1/%getFrameEvery%:start_time=0:round=zero -vsync 2 -format rgb -pix_fmt rgba -compression_algo deflate %framePrefix%%%0%paddingDigits%d.tif
if %errorlevel% neq 0 (
set errMsg=ffmpeg returned error
goto error
)
echo Done!
echo.
echo Setting base timestamp to files.
set fileNumber=0
%exiftoolBin% %exifDateParam% -overwrite_original -globaltimeshift "+0:0:0 0:0:!timeShift!" "%outputDirectory%%framePrefix%*.tif"
echo Done!
echo.
echo Setting timestamp offsets.
for %%f in ("%outputDirectory%%framePrefix%*.tif") do (
set /a "timeShift=!fileNumber!*%getFrameEvery%"
if !fileNumber! neq 0 %exiftoolBin% -P -m -overwrite_original "-datetimeoriginal+=0:0:0 0:0:!timeShift!" "%%~nxf"
set /a "fileNumber=!fileNumber!+1"
)
echo Done!
echo.
echo on
echo Geotagging images.
%exiftoolBin% -P -geotag "%gpsDataFile%" "-geotime<${DateTimeOriginal}Z" -overwrite_original "%outputDirectory%%framePrefix%*.tif"
echo Done!
echo.
goto theend
:error
echo %errMsg%. Exiting.
:theend
pause
popd
endlocal
---------------------------------------
I often have multiple video files which are all contained in one gpx file. I'm using the free program GPX editor to find the correct start time for each video.