to read lines on a per-frame basis (?).
Wolfgang Hugemann
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via
text=%{eif\:whatever\:d}
but this is restricted to integer results.
Wolfgang Hugemann
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"readvitc,drawtext=fontfile=FreeMono.ttf:fontcolor=white:text=%{metadata\\:lavfi.readvitc.tc_str}:x=(w-tw)/2:y=400-ascent"
-f avi -codec:v huffyuv test.avi
(Code by Tobias Rapp)
Any help would be appreciated.
Wolfgang Hugemann
Am 23.01.2017 um 16:13 schrieb Wolfgang Hugemann:
H
I would like to superimpose the audiograph of the video's audio on the
video itself using 'blend'. I sucseeded in doing so with the line:
c:\programme\ffmpeg\bin\ffmpeg -y -i test.avi -filter_complex
> This works for me in the cmd shell on Win7:
> type *.jpg | ffmpeg -f image2pipe -i - {encoding options) output.ext
> In any case, dir /b produces a listing. cat/type emit the data of the
> operands.
Thanks. This command line does the job. My problem was that I did not really
know what
is obviously
not supported by the Windows version. How about piping?
Wolfgang Hugemann
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W=%%~i
c:\Programme\ffmpeg\bin\ffmpeg -i %1 -y -filter:v
"drawtext=fontfile=/Windows/Fonts/arial.ttf:fontcolor=yellow:fontsize=42:text=%%{eif\\:n/!W!\\:d}"."%%{eif\\:n/!W!*100\\:d\\:2}:x=15:y=50"
-q 8 -vcodec libxvid %~dpn1_sw%~x1
Wolfgang Hugemann
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age myself
(http://www.imagemagick.org/Usage/windows).
Wolfgang Hugemann
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ffprobe can be used to get width and height for the showwaves size
option.
This set me on the rigth track!
This is what my Windows batch file now looks like:
SET FFM="c:\programme\ffmpeg\bin\ffmpeg.exe"
SET FFP="C:\programme\ffmpeg\bin\ffprobe.exe"
for /f "tokens=5 delims==_" %%i in ('%FFP%
ly ffmpeg's timecode stems from. It
doesn't seem to be a simple frame count (?).
Wolfgang Hugemann
P.S.:
The Exif timestamp's accuracy is only integer seconds. A more accurate
timestamp could only be written into the JPEG comment or into the XP
comment Exif tag, I guess. By default ff
that the SMPTE is that of the original video (?). Is it
embedded in the original video and read from there? I can't rather be
kind of a frame count. BTW: If I display the frame number, the
equivalent thing happens: n is repeated every about five frames.
How does thi swork internally?
Wolfgang Hugemann
the video timing at the spot
(using a turntable or alike as a target), but rather often, the cameras
are already dismounted when I come into play, thus this is a question
that matters when settling litigation issues ...
BTW: What are those frames that are neither I- nor P-frames?
Wolfgan
> (Assuming the camera does not use FFmpeg as firmware
> which is very unlikely.)
> You have a problem here.
> The input you are analyzing is not the stream that was
> created by the traffic camera but a file created with FFmpeg.
> So while there may absolutely be an issue (that we may or
> may
one.
The variations in the vehicle movement seem to have to be blamed on the
supervision cam.
Thank you for your support!
Wolfgang Hugemann
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To unsubscr
of AVIsynth in the mid?
Wolfgang Hugemann
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tEvery(5)" is bullet-proof:
It takes every 5th frame (in presentation order), no matter what.
...
I take from your answer that this approach is just impossible with
FFmpeg at the moment.
Wolfgang Hugemann
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interval. However this approach
may help to control rounding errors when using the fps filter.
Wolfgang Hugemann
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ff
dumping the frames as JPEGs.
Your suggested code does the trick.
Wolfgang Hugemann
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> LOL
I did not want to provoke anyone. Sorry that you took it wrong.
Wolfgang Hugemann
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nformation.
Any ideas?
Wolfgang Hugemann
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ent.
Wolfgang Hugemann
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bly concatenate two videos with different framerate
into one with VFR? I tried
ffmpeg -y -vsync 2 -i "concat:25.avi|50.avi" test.mp4
with different values for vsync, but it seems that the first input video
settles the (constant) framerate of the output, i.e. 25 fps in the above
e
howing a turntable or alike
(i.e. something moving or turning at constant speed), which will let me
allow to check how correctly ffmpeg deals with VFR video.
These videos can then be easily provided, if necessary. I will inform
you about the results.
Thanks for your help so far!
Wolfgang Hu
ng results, as it not much more than a frame counter, I guess.
So it should probably be something like
"drawtext=%%{metadata\\:???}
but what exactly?
Wolfgang Hugemann
ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 7.3.1 (GCC) 20180722
configuration: --enab
had a quick look at the source code and gained the impression that the
fft windows size is based on the height of video created (?). At least
it cannot by specified in the filter options.
Kind regards
Wolfgang Hugemann
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ffmpeg
s in your
code).
Wolfgang Hugemann
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ght by Ligos.
There are some security issues with this codec, though.
As an alternative, you may use the FFmpegSource2 (or the DirectShow)
input filter with AVIsynth, if you software can be fed by the frame server.
Wolfgang Hugemann
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bly unregister that codec after use:
regvsrv_32 /u ir50_32.dll
So far, I didn't know that it is that easy.
The link to FFmpeg is that I often check the processing chain with
AVIsynth scripting, before I settle on a permanent solution with FFmpeg.
Wolfgang Hugem
results from
lacking environment variables:
LINK : fatal error LNK1104: file "LIBCMT.lib" could not be openedn
What I am getting wrong here?
Wolfgang Hugemann
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additional frames.
What goes wrong over here?
Regards
Wolfgang Hugemann
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> Use -vsync 0. No addiitional frames should be added.
Well, this is true, but the video is switched to cfr. As I said, I tried
this too. And usin mkv or webm instead of mp4 make no difference.
ffmpeg -y -i kollision.mp4 -vf boxblur=10:1 -vsync 0 -copyts blur.mp4
gives the output:
ffmpeg
I did one step backward and tried to construct a vfr video from the
scratch using slides a an input:
ffmpeg -y -f concat -i input.txt colors.mkv
with input.txt as:
ffconcat version 1.0
file 'red.png'
duration 250ms
file 'yellow.png'
duration 500ms
file 'green.png'
duration 500ms
file 'cyan.png'
correctly, but AVidemux
and ffplay do. Plus the vfr is preserved when the slide show is
processed with ffmpeg (using -vsync vfr).
Possibly, the relatively short durations in my original video are the
reason for the problems with the original video, as there seem to be
rounding errors.
Wolfgang
vfr (as in his example).
Wolfgang Hugemann
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me issues with
variable frame rate.
At last, I ended up with Avidemux, which preserved vfr and provides some
rudimentary filters, comprising a pts burn-in filter.
Wolfgang Hugemann
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he use of ffmpeg is not suitable for the faint of heart ;-)
Wolfgang Hugemann
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executables. I guess this is because of patent issues. (It was
the same with the MP3 encoder lame for years.) This could possibly be
somewhat explained on the ffmpeg website.
Wolfgang Hugemann
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I would rather use FLACs original frontend (than ffmpeg), which also
provides a nice Windows GUI interface. FLAC conversion is also included
in a variety of software products, i.e. Exact Audio Copy, which I used
to rip all my music CDs.
Wolfgang Hugemann
P.S.: Let's see what kind of insults
would rather consider this as an inevitable
consequence of entropy compression: More repetitive sections of the WAV
(say a single note repeated several times) will be compressed more
effectively than more complex parts of the WAV. Nothing to worry about.
Wolfgang Hugemann
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