#4028 closed defect (invalid)
Videofilter "fps" to extract images each minute starts at 30 seconds offset
Reported by: | Peter B. | Owned by: | |
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Priority: | normal | Component: | avfilter |
Version: | git-master | Keywords: | fps |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Summary of the bug:
I wanted to extract an image at exactly every minute from a video, as described in the wiki article "Create a thumbnail image every X seconds of the video".
I expected to get images for positions 0s, 60s, 120s, etc.
But the result is: 0s, 30s, 90s, 150s, etc.
How to reproduce:
1) Generate a testvideo with time-information (seconds) in the image:
ffmpeg -t 300 -f lavfi -i testsrc -an -y -c:v ffv1 test.avi
2) Extract images using the "fps" video filter:
ffmpeg_git -i test.avi -vf fps=fps=1/60 -f image2 image%03d.jpg
Complete, uncut console output:
ffmpeg version N-66851-gd58fa94 Copyright (c) 2000-2014 the FFmpeg developers built on Oct 14 2014 11:43:57 with gcc 4.4.5 (Debian 4.4.5-8) configuration: --prefix=/usr/local --enable-gpl --enable-nonfree --enable-version3 --enable-postproc --enable-swscale --enable-avfilter --enable-pthreads --enable-bzlib --enable-zlib --enable-libvorbis --enable-libopenjpeg --enable-decoder=png --enable-encoder=png --disable-decoder=jpeg2000 --enable-libfreetype --enable-libschroedinger --enable-libx264 --enable-libfaac --enable-libmp3lame libavutil 54. 10.100 / 54. 10.100 libavcodec 56. 5.100 / 56. 5.100 libavformat 56. 9.100 / 56. 9.100 libavdevice 56. 1.100 / 56. 1.100 libavfilter 5. 1.105 / 5. 1.105 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 3.100 / 53. 3.100 Input #0, avi, from 'test.avi': Metadata: encoder : Lavf56.9.100 Duration: 00:05:00.00, start: 0.000000, bitrate: 886 kb/s Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), bgr0, 320x240, 881 kb/s, SAR 1:1 DAR 4:3, 25 fps, 25 tbr, 25 tbn, 25 tbc [swscaler @ 0x9abf040] deprecated pixel format used, make sure you did set range correctly [mjpeg @ 0x9ad5180] bitrate tolerance 4000000 too small for bitrate 200000, overriding Output #0, image2, to 'image%03d.jpg': Metadata: encoder : Lavf56.9.100 Stream #0:0: Video: mjpeg, yuvj444p(pc), 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 0.02 fps, 0.02 tbn, 0.02 tbc Metadata: encoder : Lavc56.5.100 mjpeg Stream mapping: Stream #0:0 -> #0:0 (ffv1 (native) -> mjpeg (native)) Press [q] to stop, [?] for help frame= 6 fps=0.3 q=1.6 Lsize=N/A time=00:06:00.00 bitrate=N/A video:84kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
The images are taken from the following positions (in seconds):
0, 30, 90, 150, 210, 270
It should be:
0, 60, 120, 180, 240, 300
Change History (6)
comment:1 by , 10 years ago
comment:3 by , 10 years ago
Using "-vf fps=fps=1/60:round=down" worked:
The images exported are now from the expected seconds: 0, 60, 120, 180, 240, etc.
Thanks :)
comment:4 by , 10 years ago
Resolution: | → invalid |
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Status: | new → closed |
comment:5 by , 10 years ago
Keywords: | fps added; thumbnail images removed |
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Look at the
round
option tofps
. Ifdown
fixes your problem, please close this bug as “invalid”.