在 Python 中提取视频帧

这篇文章 表明这将是使用 ffmpeg 提取单帧的更好方法ffmpeg -i n.wmv -ss 00:00:20 -t 00:00:1 -s 320×240 -r 1 -f singlejpeg myframe.jpg[编辑]稍后更多研究，这是一个可以输出单个 png 帧的命令行ffmpeg -i test.avi -vcodec png -ss 10 -vframes 1 -an -f rawvideo test.png在我的 ubuntu 12.04 笔记本电脑上测试I want to extract video frames and save them as image.import os, sysfrom PIL import Imagea, b, c = os.popen3("ffmpeg -i test.avi")out = c.read()dp = out.index("Duration: ")duration = out[dp+10:dp+out[dp:].index(",")]hh, mm, ss = map(float, duration.split(":"))total = (hh*60 + mm)*60 + ssfor i in xrange(9): t = (i + 1) * total / 10 os.system("ffmpeg -i test.avi -ss %0.3fs frame%i.png" % (t, i))But I have this error:FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice BellardMac OSX universal build for ffmpegX configuration: --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook --disable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264 libavutil version: 49.0.0 libavcodec version: 51.9.0 libavformat version: 50.4.0 built on Apr 15 2006 04:58:19, gcc: 4.0.1 (Apple Computer, Inc. build 5250)Input #0, avi, from 'test.avi': Duration: 00:00:30.5, start: 0.000000, bitrate: 465 kb/s Stream #0.0, 25.00 fps(r): Video: mpeg4, yuv420p, 640x480 Stream #0.1: Audio: mp3, 32000 Hz, mono, 32 kb/sUnable for find a suitable output format for 'frame0.png'Edit: ffmpeg -formatsFFmpeg version CVS, Copyright (c) 2000-2004 Fabrice BellardMac OSX universal build for ffmpegX configuration: --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook --disable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264 libavutil version: 49.0.0 libavcodec version: 51.9.0 libavformat version: 50.4.0 built on Apr 15 2006 04:58:19, gcc: 4.0.1 (Apple Computer, Inc. build 5250)File formats: E 3g2 3gp2 format E 3gp 3gp format D 4xm 4X Technologies format D RoQ Id RoQ format D aac ADTS AAC DE ac3 raw ac3 E adts ADTS AAC DE aiff Audio IFF DE alaw pcm A law format DE amr 3gpp amr file format DE asf asf format E asf_stream asf format DE au SUN AU Format DE avi avi format D avs avs format E crc crc testing format D daud D-Cinema audio format D dts raw dts DE dv DV video format E dvd MPEG2 PS format (DVD VOB) D ea Electronic Arts Multimedia Format DE ffm ffm format D film_cpk Sega FILM/CPK format D flic FLI/FLC/FLX animation format DE flv flv format E framecrc framecrc testing format DE gif GIF Animation DE h261 raw h261 DE h263 raw h263 DE h264 raw H264 video format D idcin Id CIN format DE image image sequence DE image2 image2 sequence DE image2pipe piped image2 sequence DE imagepipe piped image sequence D ingenient Ingenient MJPEG D ipmovie Interplay MVE format DE m4v raw MPEG4 video format D matroska Matroska file format DE mjpeg MJPEG video D mm American Laser Games MM format DE mmf mmf format E mov mov format D mov,mp4,m4a,3gp,3g2,mj2 QuickTime/MPEG4/Motion JPEG 2000 format E mp2 MPEG audio layer 2 DE mp3 MPEG audio layer 3 E mp4 mp4 format DE mpeg MPEG1 System format E mpeg1video MPEG video E mpeg2video MPEG2 video DE mpegts MPEG2 transport stream format D mpegvideo MPEG video E mpjpeg Mime multipart JPEG format DE mulaw pcm mu law format D nsv NullSoft Video format E null null video format DE nut nut format D nuv NuppelVideo format D ogg Ogg E psp psp mp4 format D psxstr Sony Playstation STR format DE rawvideo raw video format D redir Redirector format DE rm rm format E rtp RTP output format D rtsp RTSP input format DE s16be pcm signed 16 bit big endian format DE s16le pcm signed 16 bit little endian format DE s8 pcm signed 8 bit format D sdp SDP D shn raw shorten D smk Smacker Video D sol Sierra SOL Format E svcd MPEG2 PS format (VOB) DE swf Flash format D tta true-audio DE u16be pcm unsigned 16 bit big endian format DE u16le pcm unsigned 16 bit little endian format DE u8 pcm unsigned 8 bit format E vcd MPEG1 System format (VCD) D vmd Sierra VMD format E vob MPEG2 PS format (VOB) DE voc Creative Voice File format DE wav wav format D wc3movie Wing Commander III movie format D wsaud Westwood Studios audio format D wsvqa Westwood Studios VQA format DE yuv4mpegpipe YUV4MPEG pipe formatImage formats (filename extensions, if any, follow): DE gif gifCodecs: D V 4xm D V D 8bps DEA aac D V D aasc DEA ac3 DEA adpcm_4xm DEA adpcm_adx DEA adpcm_ct DEA adpcm_ea DEA adpcm_ima_dk3 DEA adpcm_ima_dk4 DEA adpcm_ima_qt DEA adpcm_ima_smjpeg DEA adpcm_ima_wav DEA adpcm_ima_ws DEA adpcm_ms DEA adpcm_sbpro_2 DEA adpcm_sbpro_3 DEA adpcm_sbpro_4 DEA adpcm_swf DEA adpcm_xa DEA adpcm_yamaha D A alac DEA amr_nb DEA amr_wb DEV D asv1 DEV D asv2 D V D avs D V bmp D V D camstudio D V D camtasia D V D cinepak D V D cljr D A cook D V D cyuv DES dvbsub DES dvdsub DEV D dvvideo DEV D ffv1 DEVSD ffvhuff D A flac D V D flic DEVSD flv D V D fraps DEA g726 DEV D h261 DEVSDT h263 D VSD h263i EV h263p DEV DT h264 DEVSD huffyuv D V D idcinvideo D V D indeo2 D V indeo3 D A interplay_dpcm D V D interplayvideo EV jpegls D V kmvc EV ljpeg D V D loco D A mace3 D A mace6 D V D mdec DEV D mjpeg D V D mjpegb D V D mmvideo DEA mp2 DEA mp3 D A mp3adu D A mp3on4 DEVSDT mpeg1video DEVSDT mpeg2video DEVSDT mpeg4 D A mpeg4aac D VSDT mpegvideo DEVSD msmpeg4 DEVSD msmpeg4v1 DEVSD msmpeg4v2 D V D msrle D V D msvideo1 D V D mszh D V D nuv DEV pam DEV pbm DEA pcm_alaw DEA pcm_mulaw DEA pcm_s16be DEA pcm_s16le DEA pcm_s24be DEA pcm_s24daud DEA pcm_s24le DEA pcm_s32be DEA pcm_s32le DEA pcm_s8 DEA pcm_u16be DEA pcm_u16le DEA pcm_u24be DEA pcm_u24le DEA pcm_u32be DEA pcm_u32le DEA pcm_u8 DEV pgm DEV pgmyuv DEV png DEV ppm D A qdm2 D V D qdraw D V D qpeg D V D qtrle DEV rawvideo D A real_144 D A real_288 D A roq_dpcm D V D roqvideo D V D rpza DEV D rv10 DEV D rv20 D A shorten D A smackaud D V smackvid D V D smc DEV snow D A sol_dpcm DEA sonic EA sonicls D V D sp5x DEV D svq1 D VSD svq3 D V theora D V D truemotion1 D V D truemotion2 D A truespeech D A tta D V D ultimotion D V vc9 D V D vcr1 D A vmdaudio D V D vmdvideo D A vorbis D V vp3 D V D vqavideo D A wmav1 D A wmav2 DEVSD wmv1 DEVSD wmv2 D V D wnv1 D A ws_snd1 D A xan_dpcm D V D xan_wc3 D V D xl EV xvid DEV D zlib D V zmbvSupported file protocols: file: pipe: udp: rtp: tcp: http:Frame size, frame rate abbreviations: ntsc pal qntsc qpal sntsc spal film ntsc-film sqcif qcif cif 4cifMotion estimation methods: zero(fastest) full(slowest) log phods epzs(default) x1 hex umh iterNote, the names of encoders and decoders dont always match, so there areseveral cases where the above table shows encoder only or decoder only entrieseven though both encoding and decoding are supported for example, the h263decoder corresponds to the h263 and h263p encoders, for file formats its evenworseWhat is wrong in my code? Thanks in advance 解决方案 ffmpeg is complaining about there being a missing %d in the filename because you've asked it to convert multiple frames.This post suggests this would be a better way of using ffmpeg to extract single framesffmpeg -i n.wmv -ss 00:00:20 -t 00:00:1 -s 320×240 -r 1 -f singlejpeg myframe.jpg[edit]After a bit more research, here is a command line which works outputing single png framesffmpeg -i test.avi -vcodec png -ss 10 -vframes 1 -an -f rawvideo test.pngTested on my ubuntu 12.04 laptop 这篇关于在 Python 中提取视频帧的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！