Und von meinem Macbook aus senden Sie das Video im avi-Format:
$ ffmpeg -f <input> -i "1" -f avi udp://192.168.1.3:8080
Die obigen Befehle funktionieren, aber ich hoffe, dass einige ffmpeg-Gurus einige Optimierungs-Tipps und Tricks anbieten können, um die CPU-Last auf meinem Macbook zu minimieren und gleichzeitig die Videoausgabequalität zu erhalten.
Alle Optimierungsargumente wie Bitrate (ich weiß nicht wirklich was das ist), Dateiformat-Alternativen (etwas besser als AVI?), Auflösung, Protokoll (UDP-Alternativen?) - alles, was die CPU-Auslastung auf ein absolutes Minimum hält Minimum, ohne die Qualität der Videoausgabe vollständig zu beeinträchtigen.
Für eine klare Frage:
Wie kann ich die CPU / MEM-Nutzung auf dem Macbook minimieren, ohne die Videoausgabequalität zu beeinträchtigen?
Hier habe ich versucht, das -threadsArgument mit dem -f mpegtsFormat zu verwenden, aber die CPU-Auslastung lag immer noch bei etwa 45%.
$ cat ffmpeg-20180529-103103.log ffmpeg started on 2018-05-29 at 10:31:03 Report written to "ffmpeg-20180529-103103.log" Command line: ./ffmpeg -threads 1 -f avfoundation -i 1 -f mpegts -report udp://192.168.1.33:8080 ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers built with Apple LLVM version 9.1.0 (clang-902.0.39.1) configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-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-appkit --enable-avfoundation --enable-coreimage --enable-audiotoolbox libavutil 56. 14.100 / 56. 14.100 libavcodec 58. 18.100 / 58. 18.100 libavformat 58. 12.100 / 58. 12.100 libavdevice 58. 3.100 / 58. 3.100 libavfilter 7. 16.100 / 7. 16.100 libswscale 5. 1.100 / 5. 1.100 libswresample 3. 1.100 / 3. 1.100 libpostproc 55. 1.100 / 55. 1.100 Splitting the commandline. Reading option '-threads' ... matched as AVOption 'threads' with argument '1'. Reading option '-f' ... matched as option 'f' (force format) with argument 'avfoundation'. Reading option '-i' ... matched as input url with argument '1'. Reading option '-f' ... matched as option 'f' (force format) with argument 'mpegts'. Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'. Reading option 'udp://192.168.1.33:8080' ... matched as output url. Finished splitting the commandline. Parsing a group of options: global . Applying option report (generate a report) with argument 1. Successfully parsed a group of options. Parsing a group of options: input url 1. Applying option f (force format) with argument avfoundation. Successfully parsed a group of options. Opening an input file: 1. [avfoundation @ 0x7f9f56800000] '<AVCaptureScreenInput: 0x7f9f55532240>' opened [avfoundation @ 0x7f9f56800000] Selected pixel format (yuv420p) is not supported by the input device. [avfoundation @ 0x7f9f56800000] Supported pixel formats: [avfoundation @ 0x7f9f56800000] uyvy422 [avfoundation @ 0x7f9f56800000] yuyv422 [avfoundation @ 0x7f9f56800000] nv12 [avfoundation @ 0x7f9f56800000] 0rgb [avfoundation @ 0x7f9f56800000] bgr0 [avfoundation @ 0x7f9f56800000] Overriding selected pixel format to use uyvy422 instead. [avfoundation @ 0x7f9f56800000] Probe buffer size limit of 5000000 bytes reached [avfoundation @ 0x7f9f56800000] Stream #0: not enough frames to estimate rate; consider increasing probesize Input #0, avfoundation, from '1': Duration: N/A, start: 11870.909500, bitrate: N/A Stream #0:0, 2, 1/1000000: Video: rawvideo (UYVY / 0x59565955), uyvy422, 1440x900, 1000k tbr, 1000k tbn, 1000k tbc Successfully opened the file. Parsing a group of options: output url udp://192.168.1.33:8080. Applying option f (force format) with argument mpegts. Successfully parsed a group of options. Opening an output file: udp://192.168.1.33:8080. [udp @ 0x7f9f55551c80] No default whitelist set Successfully opened the file. Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg2video (native)) Press [q] to stop, [?] for help cur_dts is invalid (this is harmless if it occurs once at the start per stream) [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 detected 4 logical cores [graph 0 input from stream 0:0 @ 0x7f9f55551d00] Setting 'video_size' to value '1440x900' [graph 0 input from stream 0:0 @ 0x7f9f55551d00] Setting 'pix_fmt' to value '15' [graph 0 input from stream 0:0 @ 0x7f9f55551d00] Setting 'time_base' to value '1/1000000' [graph 0 input from stream 0:0 @ 0x7f9f55551d00] Setting 'pixel_aspect' to value '0/1' [graph 0 input from stream 0:0 @ 0x7f9f55551d00] Setting 'sws_param' to value 'flags=2' [graph 0 input from stream 0:0 @ 0x7f9f55551d00] Setting 'frame_rate' to value '1000000/1' [graph 0 input from stream 0:0 @ 0x7f9f55551d00] w:1440 h:900 pixfmt:uyvy422 tb:1/1000000 fr:1000000/1 sar:0/1 sws_param:flags=2 [format @ 0x7f9f555522c0] Setting 'pix_fmts' to value 'yuv420p|yuv422p' [auto_scaler_0 @ 0x7f9f55552a80] Setting 'flags' to value 'bicubic' [auto_scaler_0 @ 0x7f9f55552a80] w:iw h:ih flags:'bicubic' interl:0 [format @ 0x7f9f555522c0] auto-inserting filter 'auto_scaler_0' between the filter 'Parsed_null_0' and the filter 'format' [AVFilterGraph @ 0x7f9f55729240] query_formats: 4 queried, 2 merged, 1 already done, 0 delayed [auto_scaler_0 @ 0x7f9f55552a80] picking yuv422p out of 2 ref:uyvy422 alpha:0 [auto_scaler_0 @ 0x7f9f55552a80] w:1440 h:900 fmt:uyvy422 sar:0/1 -> w:1440 h:900 fmt:yuv422p sar:0/1 flags:0x4 [mpeg2video @ 0x7f9f56071a00] intra_quant_bias = 96 inter_quant_bias = 0 [mpegts @ 0x7f9f5606f600] muxrate VBR, pcr every 24 pkts, sdt every 200, pat/pmt every 40 pkts Output #0, mpegts, to 'udp://192.168.1.33:8080': Metadata: encoder : Lavf58.12.100 Stream #0:0, 0, 1/90000: Video: mpeg2video (4:2:2), yuv422p, 1440x900, q=2-31, 200 kb/s, 240 fps, 90k tbn, 240 tbc Metadata: encoder : Lavc58.18.100 mpeg2video Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1 Clipping frame in rate conversion by 0.000008 cur_dts is invalid (this is harmless if it occurs once at the start per stream) [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918trate=8818.0kbits/s speed=1.01x [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918trate=5789.9kbits/s speed=0.996x [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 ---[ a lot of these rawvideo lines; omitted for superuser ]--- [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918trate=3320.8kbits/s speed=0.999x [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7f9f5606f000] PACKET SIZE: 2626592, STRIDE: 2918 frame= 744 fps= 30 q=31.0 Lsize= 9909kB time=00:00:24.73 bitrate=3282.0kbits/s speed=0.999x video:9113kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 8.732401% Input file #0 (1): Input stream #0:0 (video): 744 packets read (1954184448 bytes); 744 frames decoded; Total: 744 packets (1954184448 bytes) demuxed Output file #0 (udp://192.168.1.33:8080): Output stream #0:0 (video): 744 frames encoded; 744 packets muxed (9332015 bytes); Total: 744 packets (9332015 bytes) muxed 744 frames successfully decoded, 0 decoding errors [AVIOContext @ 0x7f9f5543ef80] Statistics: 0 seeks, 7244 writeouts
Durch die -f avierneute Verwendung des Formats und das Entfernen des Befehls -threads wurde die CPU-Auslastung mit 45% nicht beeinträchtigt.
$ cat ffmpeg-20180529-105147.log ffmpeg started on 2018-05-29 at 10:51:47 Report written to "ffmpeg-20180529-105147.log" Command line: ./ffmpeg -f avfoundation -i 1 -f avi -report udp://192.168.1.33:8080 ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers built with Apple LLVM version 9.1.0 (clang-902.0.39.1) configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-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-appkit --enable-avfoundation --enable-coreimage --enable-audiotoolbox libavutil 56. 14.100 / 56. 14.100 libavcodec 58. 18.100 / 58. 18.100 libavformat 58. 12.100 / 58. 12.100 libavdevice 58. 3.100 / 58. 3.100 libavfilter 7. 16.100 / 7. 16.100 libswscale 5. 1.100 / 5. 1.100 libswresample 3. 1.100 / 3. 1.100 libpostproc 55. 1.100 / 55. 1.100 Splitting the commandline. Reading option '-f' ... matched as option 'f' (force format) with argument 'avfoundation'. Reading option '-i' ... matched as input url with argument '1'. Reading option '-f' ... matched as option 'f' (force format) with argument 'avi'. Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'. Reading option 'udp://192.168.1.33:8080' ... matched as output url. Finished splitting the commandline. Parsing a group of options: global . Applying option report (generate a report) with argument 1. Successfully parsed a group of options. Parsing a group of options: input url 1. Applying option f (force format) with argument avfoundation. Successfully parsed a group of options. Opening an input file: 1. [avfoundation @ 0x7fd46a80fe00] '<AVCaptureScreenInput: 0x7fd46a52e640>' opened [avfoundation @ 0x7fd46a80fe00] Selected pixel format (yuv420p) is not supported by the input device. [avfoundation @ 0x7fd46a80fe00] Supported pixel formats: [avfoundation @ 0x7fd46a80fe00] uyvy422 [avfoundation @ 0x7fd46a80fe00] yuyv422 [avfoundation @ 0x7fd46a80fe00] nv12 [avfoundation @ 0x7fd46a80fe00] 0rgb [avfoundation @ 0x7fd46a80fe00] bgr0 [avfoundation @ 0x7fd46a80fe00] Overriding selected pixel format to use uyvy422 instead. [avfoundation @ 0x7fd46a80fe00] Probe buffer size limit of 5000000 bytes reached [avfoundation @ 0x7fd46a80fe00] Stream #0: not enough frames to estimate rate; consider increasing probesize Input #0, avfoundation, from '1': Duration: N/A, start: 13115.322833, bitrate: N/A Stream #0:0, 2, 1/1000000: Video: rawvideo (UYVY / 0x59565955), uyvy422, 1440x900, 1000k tbr, 1000k tbn, 1000k tbc Successfully opened the file. Parsing a group of options: output url udp://192.168.1.33:8080. Applying option f (force format) with argument avi. Successfully parsed a group of options. Opening an output file: udp://192.168.1.33:8080. [udp @ 0x7fd46a4319c0] No default whitelist set Successfully opened the file. Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native)) Press [q] to stop, [?] for help cur_dts is invalid (this is harmless if it occurs once at the start per stream) [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 detected 4 logical cores [graph 0 input from stream 0:0 @ 0x7fd46a463080] Setting 'video_size' to value '1440x900' [graph 0 input from stream 0:0 @ 0x7fd46a463080] Setting 'pix_fmt' to value '15' [graph 0 input from stream 0:0 @ 0x7fd46a463080] Setting 'time_base' to value '1/1000000' [graph 0 input from stream 0:0 @ 0x7fd46a463080] Setting 'pixel_aspect' to value '0/1' [graph 0 input from stream 0:0 @ 0x7fd46a463080] Setting 'sws_param' to value 'flags=2' [graph 0 input from stream 0:0 @ 0x7fd46a463080] Setting 'frame_rate' to value '1000000/1' [graph 0 input from stream 0:0 @ 0x7fd46a463080] w:1440 h:900 pixfmt:uyvy422 tb:1/1000000 fr:1000000/1 sar:0/1 sws_param:flags=2 [format @ 0x7fd46a4645c0] Setting 'pix_fmts' to value 'yuv420p' [auto_scaler_0 @ 0x7fd46a464c00] Setting 'flags' to value 'bicubic' [auto_scaler_0 @ 0x7fd46a464c00] w:iw h:ih flags:'bicubic' interl:0 [format @ 0x7fd46a4645c0] auto-inserting filter 'auto_scaler_0' between the filter 'Parsed_null_0' and the filter 'format' [AVFilterGraph @ 0x7fd46a42f2c0] query_formats: 4 queried, 2 merged, 1 already done, 0 delayed [auto_scaler_0 @ 0x7fd46a464c00] w:1440 h:900 fmt:uyvy422 sar:0/1 -> w:1440 h:900 fmt:yuv420p sar:0/1 flags:0x4 [avi @ 0x7fd46b81aa00] Frame rate very high for a muxer not efficiently supporting it. Please consider specifying a lower framerate, a different muxer or -vsync 2 [mpeg4 @ 0x7fd46b977200] intra_quant_bias = 0 inter_quant_bias = -64 [avi @ 0x7fd46b81aa00] reserve_index_space:0 master_index_max_size:256 [avi @ 0x7fd46b81aa00] duration_est:36000.000, filesize_est:0.9GiB, master_index_max_size:256 Output #0, avi, to 'udp://192.168.1.33:8080': Metadata: ISFT : Lavf58.12.100 Stream #0:0, 0, 1/600: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1440x900, q=2-31, 200 kb/s, 65535 fps, 600 tbn, 65535 tbc Metadata: encoder : Lavc58.18.100 mpeg4 Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1 Clipping frame in rate conversion by 0.000008 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918trate=6100.5kbits/s speed=1.16x [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 ---[ a lot of these rawvideo lines; omitted for superuser ]--- [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918trate=2806.4kbits/s speed=1.01x [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 [rawvideo @ 0x7fd46a840800] PACKET SIZE: 2626592, STRIDE: 2918 frame= 340 fps= 30 q=31.0 Lsize= 3879kB time=00:00:11.33 bitrate=2803.6kbits/s speed= 1x video:3825kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.425499% Input file #0 (1): Input stream #0:0 (video): 340 packets read (893041280 bytes); 340 frames decoded; Total: 340 packets (893041280 bytes) demuxed Output file #0 (udp://192.168.1.33:8080): Output stream #0:0 (video): 340 frames encoded; 340 packets muxed (3916524 bytes); Total: 340 packets (3916524 bytes) muxed 340 frames successfully decoded, 0 decoding errors [AVIOContext @ 0x7fd46a56ffc0] Statistics: 0 seeks, 2923 writeouts
Die Verwendung -s 1024x576scheint die CPU-Auslastung zu verringern, aber der Text in der Videoausgabe wird fast unleserlich.
Führen Sie den Mac-Befehl für eine kurze Zeit mit "-report" aus und geben Sie die Protokolldatei frei.
Gyan vor 5 Jahren
0
@Gyan Hey, ich habe die Frage um die Protokolle `-report` erweitert
user909737 vor 5 Jahren
0
Weiter mit `./ffmpeg -f avfoundation -i 1 -pix_fmt yuv420p -c: v libx264 -preset schneller -threads 1 -f mpegts udp: //192.168.1.33: 8080`
Gyan vor 5 Jahren
0
@Gyan Danke, dies hat geholfen, die CPU-Auslastung um 5% bis 15% zu senken. Könnten Sie kurz erklären, was die folgenden Argumente bedeuten: `-pix_fmt yuv420p -c: v libx264 -preset schneller -f mpegts`. Wenn Sie die Erklärung in eine Antwort schreiben, akzeptiere ich sie.
user909737 vor 5 Jahren
0
Ich werde es morgen hinzufügen.
Gyan vor 5 Jahren
0
-f mpegtsLegt das Ausgabedateiformat fest. mpegts akzeptiert viele Videocodecs und ist das De-facto-Format für die Übertragung von digitalen Sendungen.
Bei der Ausgabe an mpegtswählt ffmpeg seinen nativen MPEG-2-Encoder. Der MPEG-2-Videocodec ist 20 Jahre alt. Der heutige Standard-Codec ist H264. Der Standardcodierer in ffmpeg ist libx264. Das muss hier ausdrücklich festgelegt werden -c:v libx264. Es kann übersprungen werden, wenn das Ausgabeformat x264 als Standardcodierer hat. preset fasterist ein Modus von x264, bei dem einige der zeitaufwändigen und ressourcenintensiven Methoden abgerufen werden, die beim Komprimieren verwendet werden.
-pix_fmt yuv420pLegt das Ausgabepixelformat fest. Dies ist das einzige Pixelformat, das von Webplayern und vielen Hardware- / Software-Playern unterstützt wird.