ฉันใช้ ffmpeg เพื่อแยกเฟรมจากวิดีโอ แต่กระบวนการทำงานช้ามาก เมื่อดูการใช้งาน CPU ฉันเห็นว่า ffmpeg ใช้ CPU เพียง 50% ฉันได้พยายามเพิ่มเธรด 4 แต่ดูเหมือนว่าจะไม่มีผลกระทบใด ๆ ฉันต้องการเพิ่มความเร็วของกระบวนการนี้ให้มากที่สุด ฉันจะทำมันได้อย่างไร
อัปเดต: ดังนั้นฉันจึงทำการทดสอบฉันพยายามก่อนที่จะแปลงวิดีโอหนึ่งรายการโดยมีผลดังนี้:
ffmpeg version N-71959-g9253cc4 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.9.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
libavutil 54. 23.101 / 54. 23.101
libavcodec 56. 37.102 / 56. 37.102
libavformat 56. 32.100 / 56. 32.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 16.101 / 5. 16.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\1.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf55.33.100
Duration: 00:30:23.13, start: 0.000000, bitrate: 573 kb/s
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 501 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 59.94 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 32 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream #0:2(und): Data: none (rtp / 0x20707472), 26 kb/s (default)
Metadata:
creation_time : 2014-08-27 16:05:35
handler_name : GPAC ISO Hint Handler
Stream #0:3(und): Data: none (rtp / 0x20707472), 7 kb/s (default)
Metadata:
creation_time : 2014-08-27 16:05:53
handler_name : GPAC ISO Hint Handler
[swscaler @ 0000000002e63360] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'C:\TEMP\1-%d.jpg':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf56.32.100
Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 640x360 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 1 fps, 1 tbn, 1 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc56.37.102 mjpeg
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
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frame= 42 fps= 28 q=1.6 size=N/A time=00:00:42.00 bitrate=N/A dup=0 drop=1172
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frame= 1424 fps= 26 q=1.6 size=N/A time=00:23:44.00 bitrate=N/A dup=0 drop=41202
frame= 1437 fps= 26 q=1.6 size=N/A time=00:23:57.00 bitrate=N/A dup=0 drop=41589
frame= 1451 fps= 26 q=1.6 size=N/A time=00:24:11.00 bitrate=N/A dup=0 drop=41971
frame= 1463 fps= 26 q=1.6 size=N/A time=00:24:23.00 bitrate=N/A dup=0 drop=42340
frame= 1477 fps= 26 q=1.6 size=N/A time=00:24:37.00 bitrate=N/A dup=0 drop=42724
frame= 1490 fps= 26 q=1.6 size=N/A time=00:24:50.00 bitrate=N/A dup=0 drop=43129
frame= 1503 fps= 26 q=1.6 size=N/A time=00:25:03.00 bitrate=N/A dup=0 drop=43500
frame= 1516 fps= 26 q=1.6 size=N/A time=00:25:16.00 bitrate=N/A dup=0 drop=43869
frame= 1530 fps= 26 q=1.6 size=N/A time=00:25:30.00 bitrate=N/A dup=0 drop=44260
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frame= 1556 fps= 26 q=1.6 size=N/A time=00:25:56.00 bitrate=N/A dup=0 drop=45033
frame= 1569 fps= 26 q=1.6 size=N/A time=00:26:09.00 bitrate=N/A dup=0 drop=45393
frame= 1582 fps= 26 q=1.6 size=N/A time=00:26:22.00 bitrate=N/A dup=0 drop=45766
frame= 1594 fps= 26 q=1.6 size=N/A time=00:26:34.00 bitrate=N/A dup=0 drop=46139
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frame= 1645 fps= 26 q=1.6 size=N/A time=00:27:25.00 bitrate=N/A dup=0 drop=47609
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frame= 1710 fps= 26 q=1.6 size=N/A time=00:28:30.00 bitrate=N/A dup=0 drop=49474
frame= 1723 fps= 26 q=1.6 size=N/A time=00:28:43.00 bitrate=N/A dup=0 drop=49858
frame= 1736 fps= 26 q=1.6 size=N/A time=00:28:56.00 bitrate=N/A dup=0 drop=50249
frame= 1749 fps= 26 q=1.6 size=N/A time=00:29:09.00 bitrate=N/A dup=0 drop=50612
frame= 1762 fps= 26 q=1.6 size=N/A time=00:29:22.00 bitrate=N/A dup=0 drop=50981
frame= 1774 fps= 26 q=1.6 size=N/A time=00:29:34.00 bitrate=N/A dup=0 drop=51349
frame= 1787 fps= 26 q=1.6 size=N/A time=00:29:47.00 bitrate=N/A dup=0 drop=51727
frame= 1800 fps= 26 q=1.6 size=N/A time=00:30:00.00 bitrate=N/A dup=0 drop=52098
frame= 1813 fps= 26 q=1.6 size=N/A time=00:30:13.00 bitrate=N/A dup=0 drop=52486
frame= 1824 fps= 26 q=1.6 Lsize=N/A time=00:30:24.00 bitrate=N/A dup=0 drop=52798
video:40987kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
กระบวนการทั้งหมดใช้เวลา 71 วินาทีด้วยอัตราเฟรม 26 การใช้งาน CPU 50%
จากนั้นฉันพยายามเรียกใช้การแปลงเดียวกันโดยใช้วิดีโอเดียวกัน แต่ใช้ 2 ขนาน (โดยทั่วไปแล้วจะแปลง 2 ครั้งและบันทึกภาพด้วยชื่อต่างกัน 2 ชื่อ) อัตราเฟรมของวิดีโอแต่ละรายการมีความเสถียรประมาณ 17 วิดีโอสำหรับแต่ละวิดีโอการใช้งาน CPU 45 สำหรับแต่ละกระบวนการและเวลาทั้งหมดคือ 105 วินาทีสำหรับครั้งแรกและ 104 วินาทีสำหรับอีกวิดีโอหนึ่ง ดังนั้นการเรียกใช้พวกเขาทีละคนจะใช้เวลา 70 + 70 = 140 วินาทีในขณะที่รัน 2 istances ในเวลาเดียวกันบังคับให้ CPU ทำงานที่ 100% ใช้เวลา 105 วินาทีในการแปลงวิดีโอทั้งสองประหยัด 35 วินาทีซึ่งมีขนาดใหญ่ เป็นผู้นำเข้า