Hi,
After more testing extracting images from DVD using dvd2concat, it looks like
that when I use the seek option before the input, to have a fast extraction,
only keyframes are extracted instead of the exact frames. I tried also by
putting a second seek option after the input, to go fast near the good frame
then go accurately to the good frame, but I got the same result, only keyframes
are extracted.
I tried also adding the -accurate_seek option (should be the default anyway,
but we never know) without improvement.
Here's the full output :
ffmpeg -f concat -safe 0 -ss 00:02:31.125 -i /tmp/dvd_concat.txt -y -an -f
image2 -vframes 1 -q:v 4 frames1.jpg
ffmpeg version 2.5.4 Copyright (c) 2000-2015 the FFmpeg developers
built on Mar 3 2015 10:53:22 with gcc 4.2.1 (GCC) (Apple Inc. build 5666)
(dot 3)
configuration: --prefix=/usr/local/Cellar/ffmpeg/2.5.4 --enable-shared
--enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables
--enable-avresample --cc=gcc-4.2 --host-cflags= --host-ldflags=
--enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid
--enable-libfaac --enable-libfdk-aac --enable-nonfree --enable-vda
libavutil 54. 15.100 / 54. 15.100
libavcodec 56. 13.100 / 56. 13.100
libavformat 56. 15.102 / 56. 15.102
libavdevice 56. 3.100 / 56. 3.100
libavfilter 5. 2.103 / 5. 2.103
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, concat, from '/tmp/dvd_concat.txt':
Duration: 00:38:16.50, start: 0.000000, bitrate: 0 kb/s
Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, smpte170m), 704x480 [SAR
10:11 DAR 4:3], max. 9558 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
[swscaler @ 0x102800600] deprecated pixel format used, make sure you did set
range correctly
Output #0, image2, to 'frames1.jpg':
Metadata:
encoder : Lavf56.15.102
Stream #0:0: Video: mjpeg, yuvj420p(pc), 704x480 [SAR 10:11 DAR 4:3],
q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc
Metadata:
encoder : Lavc56.13.100 mjpeg
Stream mapping:
Stream #0:0 -> #0:0 (mpeg2video (native) -> mjpeg (native))
Press [q] to stop, [?] for help
frame= 1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.03 bitrate=N/A dup=1 drop=1
video:12kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: unknown
Is this normal? How I can extract frame accurately from DVD in a fast way?
Regards,
Etienne Desautels
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