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ffmpeg entropy/bitplanenoise/freezedetect 过滤器正确使用

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ffmpeg entropy/bitplanenoise/freezedetect 过滤器正确使用

我正在编写一个用于测试视频流的 node js 包。

我想要实现诸如测量熵、位平面噪声和冻结检测等功能，并包装相应的 ffmpeg 过滤器。

目前我在执行此操作时遇到了问题（我认为这是语法使用不正确的问题）：

  1. 似乎我当前的 ffmpeg 版本（4.1.3）不支持冻结检测过滤器：

    ffmpeg -filters | grep freeze ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers built with Apple LLVM version 10.0.1 (clang-1001.0.46.3) configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat 58. 20.100 / 58. 20.100 libavdevice 58. 5.100 / 58. 5.100 libavfilter 7. 40.101 / 7. 40.101 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 3.100 / 5. 3.100 libswresample 3. 3.100 / 3. 3.100 libpostproc 55. 3.100 / 55. 3.100

    ffmpeg -i simps_mpeg.mp4 -vf freezedetect -f null - ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers built with Apple LLVM version 10.0.1 (clang-1001.0.46.3) configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat 58. 20.100 / 58. 20.100 libavdevice 58. 5.100 / 58. 5.100 libavfilter 7. 40.101 / 7. 40.101 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 3.100 / 5. 3.100 libswresample 3. 3.100 / 3. 3.100 libpostproc 55. 3.100 / 55. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'simps_mpeg.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2mp41 encoder : Lavf58.20.100 Duration: 00:00:09.72, start: 0.000000, bitrate: 1129 kb/s Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1128 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default) Metadata: handler_name : Core Media Video Stream mapping: Stream #0:0 -> #0:0 (mpeg4 (native) -> wrapped_avframe (native)) Press [q] to stop, [?] for help [AVFilterGraph @ 0x7fb1a1d13ec0] No such filter: 'freezedetect' Error reinitializing filters! Failed to inject frame into filter network: Invalid argument Error while processing the decoded data for stream #0:0 Conversion failed!

  2. 熵过滤器不输出任何与熵测量相关的内容

    ffmpeg -i simps_mpeg.mp4 -vf entropy -f null - ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers built with Apple LLVM version 10.0.1 (clang-1001.0.46.3) configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat 58. 20.100 / 58. 20.100 libavdevice 58. 5.100 / 58. 5.100 libavfilter 7. 40.101 / 7. 40.101 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 3.100 / 5. 3.100 libswresample 3. 3.100 / 3. 3.100 libpostproc 55. 3.100 / 55. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'simps_mpeg.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2mp41 encoder : Lavf58.20.100 Duration: 00:00:09.72, start: 0.000000, bitrate: 1129 kb/s Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1128 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default) Metadata: handler_name : Core Media Video Stream mapping: Stream #0:0 -> #0:0 (mpeg4 (native) -> wrapped_avframe (native)) Press [q] to stop, [?] for help Output #0, null, to 'pipe:': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2mp41 encoder : Lavf58.20.100 Stream #0:0(und): Video: wrapped_avframe, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 23.98 fps, 23.98 tbn, 23.98 tbc (default) Metadata: handler_name : Core Media Video encoder : Lavc58.35.100 wrapped_avframe frame= 233 fps=0.0 q=-0.0 Lsize=N/A time=00:00:09.71 bitrate=N/A speed=25.7x video:122kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  3. 与位平面噪声过滤器存在同样的问题 - 位平面噪声测量无输出：

    ffmpeg -i simps_mpeg.mp4 -vf bitplanenoise -f null - ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers built with Apple LLVM version 10.0.1 (clang-1001.0.46.3) configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/openjdk-12.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr libavutil 56. 22.100 / 56. 22.100 libavcodec 58. 35.100 / 58. 35.100 libavformat 58. 20.100 / 58. 20.100 libavdevice 58. 5.100 / 58. 5.100 libavfilter 7. 40.101 / 7. 40.101 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 3.100 / 5. 3.100 libswresample 3. 3.100 / 3. 3.100 libpostproc 55. 3.100 / 55. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'simps_mpeg.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2mp41 encoder : Lavf58.20.100 Duration: 00:00:09.72, start: 0.000000, bitrate: 1129 kb/s Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1128 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default) Metadata: handler_name : Core Media Video Stream mapping: Stream #0:0 -> #0:0 (mpeg4 (native) -> wrapped_avframe (native)) Press [q] to stop, [?] for help Output #0, null, to 'pipe:': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2mp41 encoder : Lavf58.20.100 Stream #0:0(und): Video: wrapped_avframe, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 23.98 fps, 23.98 tbn, 23.98 tbc (default) Metadata: handler_name : Core Media Video encoder : Lavc58.35.100 wrapped_avframe frame= 233 fps=0.0 q=-0.0 Lsize=N/A time=00:00:09.71 bitrate=N/A speed=12.2x video:122kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

关于 freezedetect：这个过滤器是否过时了？

ffpmeg 版本 4.1.3，操作系统：MacOS Mojave 10.14.5

答案1

您需要一个最新的 git 构建版本才能包含 freezedetect - 从以下位置获取https://ffmpeg.zeranoe.com/builds/。

就 bitplanenoise 和 entropy 而言，它们将其数据打印为元数据条目。因此，您需要添加元数据过滤器并将其模式设置为打印以获取该数据。

例如

ffmpeg -i simps_mpeg.mp4 -vf bitplanenoise,metadata=mode=print:file=- -f null -

这会将数据打印到控制台。

要转储到文件，

ffmpeg -i simps_mpeg.mp4 -vf bitplanenoise,metadata=mode=print:file=simps_mpeg_bpn.log -f null -

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