Hi folks,
I'm trying to extract frames from various videos using ffmpeg. I need 18 frames from each videos and I determine at which place to take frames using the -ss option.
The problem is the more -ss is far from the beginning, the more time it takes to grab the frame. Check this log:
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ffmpeg -i "myvideo.avi" -vframes 1 -an -ss 3600 -f image2 myframe-%05d.jpeg
FFmpeg version SVN-r15815, Copyright (c) 2000-2008 Fabrice Bellard, et al.
configuration: --enable-memalign-hack --enable-postproc --enable-swscale --ena
ble-gpl --enable-libfaac --enable-libfaad --enable-libgsm --enable-libmp3lame --
enable-libvorbis --enable-libtheora --enable-libx264 --enable-libxvid --disable-
ffserver --disable-vhook --enable-avisynth --enable-pthreads
libavutil 49.12. 0 / 49.12. 0
libavcodec 52. 3. 0 / 52. 3. 0
libavformat 52.23. 1 / 52.23. 1
libavdevice 52. 1. 0 / 52. 1. 0
libswscale 0. 6. 1 / 0. 6. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on Nov 13 2008 10:28:29, gcc: 4.2.4 (TDM-1 for MinGW)
Input #0, avi, from 'myvideo.avi':
Duration: 01:46:43.00, start: 0.000000, bitrate: 913 kb/s
Stream #0.0: Video: mpeg4, yuv420p, 688x288 [PAR 1:1 DAR 43:18], 25.00 tb(r)
Stream #0.1: Audio: mp3, 48000 Hz, stereo, s16, 128 kb/s
Output #0, image2, to 'myframe-%05d.jpeg':
Stream #0.0: Video: mjpeg, yuvj420p, 688x288 [PAR 1:1 DAR 43:18], q=2-31, 20
0 kb/s, 25.00 tb(c)
Stream mapping:
Stream #0.0 -> #0.0
Press [q] to stop encoding
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frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 0 fps= 0 q=0.0 size= -0.kB time=10000000000.00 bitrate= -0.0kbi
frame= 1 fps= 0 q=4.6 Lsize= -0.kB time=0.04 bitrate= -4.4kbits/s
video:21kB audio:0kB global headers:0kB muxing overhead -100.104458%
-------------------------------------------------------------------------------------------------
Each 'frame=0' line takes about 0.5 to 1 second to be processed. Extracting a frame at 3600 secondes takes about 2 minutes. Capturing 18 frames at this rate becomes ridiculous. Is there something to do to speed this up?
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