I would like to use unity and silence parameters of afade filter as documented here. To achieve partial fade-out, but getting an option not found error.
I am using ffmpeg version 5.1.2.
To reproduce:
ffmpeg -f lavfi -i "sine=frequency=500:duration=5" -filter_complex "afade=start_time=1:type=out:unity=0.1" -y test.wav
Error:
[Parsed_afade_0 # 0x148004c30] Option 'unity' not found
[AVFilterGraph # 0x148004ba0] Error initializing filter 'afade' with args 'start_time=1:type=out:unity=0.1'
Error initializing complex filters.
Option not found
They are currently available in git master builds, and will be available in ffmpeg 5.2 onwards.
Related
my code:
ffmpeg -i "C:\Users\xxxxxxx\Desktop\aaaaaa\a.mp4" -frames 1 -vf "drawtext="fontsize=60:fontcolor=yellow select=not(mod(n,18)),scale=200:100,tile=15x48" "C:\Users\xxxxxxx\Desktop\aaaaaa\a.png"
i got this error:
At least one output file must be specified
where is the problem?
command is get error and i need fix
I'm using FFmpeg to extract frames of a video and therefore I want to print the metadata of the video to a text file first (to get the scene\ value of each frame).
This already works for me with something like:
ffmpeg -i input.mp4 -vf "select='gte(scene,0)',metadata=print:file=scenescores.txt" -an -f null -
Because I'm using all this inside of a Java application I want to pass an absolute path (of an temp directory) to print:file= instead of the currently relative one which will write it to the root directory of the project.
But when I try to specify an absolute path like D:\scenescores.txt I get the following error:
[metadata # 00000203282ff0c0] Unable to parse option value "scenescores.txt" as boolean
[metadata # 00000203282ff0c0] Error setting option direct to value scenescores.txt.
[Parsed_metadata_1 # 00000203269bdf00] Error applying options to the filter.
[AVFilterGraph # 0000020328020840] Error initializing filter 'metadata' with args 'print:file=D:\scenescores.txt'
Is there any way to achieve printing to an absolute path? Am I missing some escape rules or something?
I played a lot with escaping different things and in the end it worked for me like this:
ffmpeg -i input.mp4 -vf "select='gte(scene,0)',metadata=print:file=\'D:\scenescores.txt\'" -an -f null -
The difference is that the path is surrounded by \'.
Also I read that escaping \ to \\ or / can help sometimes.
I'm trying to rotate videos and increase its sound as well as change itsframe rate
ffplay -i C:/Users/thota/OneDrive/Desktop/VET/Input.mp4 -af "volume="10.0",atempo="10.0" -vf "transpose=2,transpose=2,setpts=1/"10.0"*PTS,scale="3840:2160",fps="5.0"
I'm using FFmpeg as I'm trying to build a video editing application hence I need to combine many operations when i try to use above command I'm getting this error(in command im using ffplay as I just want to see output)
error
[atempo # 000001fdd50c7c40] [Eval # 00000047b79fe770] Undefined constant or missing '(' in
'vftranspose=2'
[atempo # 000001fdd50c7c40] Unable to parse option value "10.0 -vf transpose=2"
[atempo # 000001fdd50c7c40] [Eval # 00000047b79fe770] Undefined constant or missing '(' in
'vftranspose=2'
[atempo # 000001fdd50c7c40] Unable to parse option value "10.0 -vf transpose=2"
[atempo # 000001fdd50c7c40] Error setting option tempo to value 10.0 -vf transpose=2.
[Parsed_atempo_1 # 000001fdd50c7b40] Error applying options to the filter.
Error initializing filter 'atempo' with args '10.0 -vf transpose=2'
Pleas help me solve this issue and suggest me a best way to add multiple operations when i try to use , its being tough so is their any other way
If yes please let me know
Thank you
It looks like you are missing quotation marks " character in two places.
The following command works (weird audio, but no errors):
ffplay -i C:/Users/thota/OneDrive/Desktop/VET/Input.mp4 -af "volume="10.0",atempo="10.0"" -vf "transpose=2,transpose=2,setpts=1/"10.0"*PTS,scale="3840:2160",fps="5.0""
You don't need all the quotation marks, and you may improve readability by using '' instead of nested "".
The following command is equivalent:
ffplay -i C:/Users/thota/OneDrive/Desktop/VET/Input.mp4 -af "volume=10.0,atempo=10.0" -vf "transpose=2,transpose=2,setpts=1/10.0*PTS,scale='3840:2160',fps=5.0"
I am trying to extract and parse KLV data from a video stream. I found the following example in a Github repository. I am wondering what does the mapping option data-re do?
$ ffmpeg -i Day\ Flight.mpg -map data-re -codec copy -f data -
I understand the rest of the command, and know that -map is used to choose streams from inputs. But what does data-re mean. I couldn't find any explanation for it (or similar mapping option or stream identifier) in the documentation, e.g. here and here.
It's a typo and incorrect. The only time you use arbitrary label names is when using -filter_complex.
Use:
$ ffmpeg -i Day\ Flight.mpg -map 0:d -c copy -f data -
I could understand a user trying data, but data-re? Might be a double typo for -map data -re, where -re is intended to be the "Read input at native frame rate" input option (-map data is still invalid in this case).
It's not a valid value currently. It could possibly have been a value historically, but I doubt it. Most likely, it "worked" because the map arg parser would ignore additional letters if a lazy evaluation matched a stream and the d in data-re would match data streams. The parser is no longer that clumsy.
I have various MP3 files which I need to process.
The processing includes quite a few steps, but one important one is to remove the Info/Xing tag from the file.
I successfully do so by running lame -t .... However, there are times when I want to run ffmpeg to do a conversion which will happen after the lame -t ... conversion and I see that ffmpeg re-insert an Info/Xing tag in the MP3 file.
Is there a command line option I can use so ffmpeg does not re-insert the Info/Xing tag?
-write_xing 0
See ffmpeg -h muxer=mp3