On 9/30/18 2:58 PM, Carl Eugen Hoyos wrote:
2018-09-30 17:21 GMT+02:00, sean darcy <[email protected]>:
On 9/30/18 10:45 AM, sean darcy wrote:
On 9/29/18 5:15 PM, Carl Eugen Hoyos wrote:
2018-09-29 22:46 GMT+02:00, sean darcy <[email protected]>:
On 9/28/18 7:29 PM, Carl Eugen Hoyos wrote:
2018-09-28 20:58 GMT+02:00, sean darcy <[email protected]>:
Also, I used ffprobe:
ffprobe -show_frames -select_streams v -i in.mpg 2>&1 | grep -c
interlaced_frame=1
2052
ffprobe -show_frames -select_streams v -i in.mpg 2>&1 | grep -c
interlaced_frame=0
30347
This means there are at least some interlaced frames
No, unfortunately ffprobe cannot tell you (the information above
is mostly unrelated to the question if the content is interlaced,
telecined or progressive).
Either use the idet filter or do a visual inspection.
Carl Eugen
_______________________________________________
Never used idet filter before, so don't know how to make use of the
info.
ffmpeg -vf idet -frames:v 5000 -an -f rawvideo -y /dev/null -i in.mpg
ffmpeg version git-snapshot-20180928-RPMFusion Copyright (c) 2000-2018
the FFmpeg developers
built with gcc 8 (GCC)
configuration: --prefix=/usr --bindir=/usr/bin
--datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg
--libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64
--optflags='-O2 -ffast-math -march=native -ftree-vectorize
-fomit-frame-pointer -pipe -fPIC' --enable-bzlib --disable-crystalhd
--enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls
--enable-ladspa --enable-libass --enable-libbluray --enable-libcdio
--enable-libfdk-aac --enable-nonfree --enable-indev=jack
--enable-libfreetype --enable-libfribidi --enable-libgsm
--enable-libmp3lame --enable-openal --enable-opencl --disable-libopencv
--enable-opengl --enable-libopenjpeg --enable-libopus --enable-libpulse
--enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis
--enable-libv4l2 --enable-libvpx --enable-libwebp --enable-libx264
--enable-libx265 --enable-avfilter --enable-postproc --enable-pthreads
--disable-static --enable-shared --enable-gpl --enable-version3
--enable-nonfree --disable-debug --enable-stripping
--shlibdir=/usr/lib64 --enable-runtime-cpudetect
libavutil 56. 19.101 / 56. 19.101
libavcodec 58. 31.101 / 58. 31.101
libavformat 58. 18.103 / 58. 18.103
libavdevice 58. 4.104 / 58. 4.104
libavfilter 7. 33.100 / 7. 33.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100
[mpeg2video @ 0x1eef200] Invalid frame dimensions 0x0.
Last message repeated 10 times
Input #0, mpeg, from 'in.mpg':
Duration: 26:09:34.50, start: 1305.384367, bitrate: 91 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv,
progressive), 720x480 [SAR 8:9 DAR 4:3], Closed Captions, 29.97 fps,
59.94 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x81]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
Stream #0:2[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
Stream #0:3[0x1bf]: Data: dvd_nav_packet
Stream #0:4[0x22]: Subtitle: dvd_subtitle
Stream #0:5[0x21]: Subtitle: dvd_subtitle
Stream #0:6[0x20]: Subtitle: dvd_subtitle
Stream mapping:
Stream #0:0 -> #0:0 (mpeg2video (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, rawvideo, to '/dev/null':
Metadata:
encoder : Lavf58.18.103
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 720x480
[SAR 8:9 DAR 4:3], q=2-31, 124291 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc
Metadata:
encoder : Lavc58.31.101 rawvideo
More than 1000 frames duplicated= 2191360kB time=00:02:24.44
bitrate=124280.6kbits/s dup=867 drop=0 speed=72.2x
frame= 5000 fps=2162 q=-0.0 Lsize= 2531250kB time=00:02:46.83
bitrate=124291.7kbits/s dup=1001 drop=0 speed=72.1x
video:2531250kB audio:0kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.000000%
[Parsed_idet_0 @ 0x21f7dc0] Repeated Fields: Neither: 4000 Top: 0
Bottom: 0
[Parsed_idet_0 @ 0x21f7dc0] Single frame detection: TFF: 0 BFF:
0 Progressive: 3894 Undetermined: 106
[Parsed_idet_0 @ 0x21f7dc0] Multi frame detection: TFF: 0 BFF: 0
Progressive: 4000 Undetermined: 0
As I read this, the idet filter only saw 4000 out of the 5000 frames, of
which 106 couldn't be classified. What about the 1001 duplicated
frames ?
This indicates soft-telecine of progressive original.
Please test with output option "-r 24000/1001". If that
leads to (many) duplicated and dropped frames, there
are ways to work-around iirc.
Carl Eugen
You are the man !
Ran the entire clip at 24000/1001, only 11 duplicated frames.
This imo indicates that the command line is correct.
What did you see in the idet output that told you that the progressive
original (~24fps, correct ? ) had been telecined ?
I saw that it was not telecined (since all frames are progressive).
Therefore the only explanation that made sense was soft-telecine:
The actual framerate was always 24000/1001 but since old American
televisions required 30000/1001, the stream contains information
that frames have to be duplicated (what FFmpeg did originally).
Maybe unrelated:
Note that FFmpeg's mpeg-ps muxer is unable to add this information
to its output streams, MEncoder can do it.
Thanks. Very helpful.
I've been googling soft telecine. Some have suggested using "-re"
as the frame rate. Why would 24000/1001 be preferred ?
That does not sound correct, "-re" allows FFmpeg to encode in
real-time (instead of faster), it should not change the output frame
rate. Does it?
Carl Eugen
From 12 years ago:
https://lists.libav.org/pipermail/ffmpeg-user/2006-February/002349.html
make an decoding/encoding with
framerate " -re" (instead of "-r pal" or -r ntsc" or "-r 25" or "-r
30000:1001", ...) the "-re" parameter for framerate will just
decode/encode your input without forcing framerate (read your input at
its own framerate and write it "the same")
You'll will see (even if your input was a ntsc-film with pulldown)
that your output will be 24000:1001 too.
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