Hello
I would like to know if is there any yt-dlp command to extract a video (say from youtube) and convert it into slowmotion.
Thank you very much in advance for any help!
Pib
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QUick search says no. WHich I expected, I'd be very surprised if any streaming downloader did this.
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I would like to know if is there any yt-dlp command to extract a video (say from youtube) and convert it into slowmotion.
read here
https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video -
Thank you guys for the prompt reply!
I managed to do a version for windows system but using temporary files.
I would like to do it via web with no temp files. I guess i will have to use pipes stdin and stdout and multiple/sequential commands.
It won't be easy that's why i would like some help. -
The basic format for piping yt-dlp to ffplay is:
Code:yt-dlp "https://path/to/video" -o - | "x:\path\to\ffplay.exe" -
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Thank you jagabo for the help!
I managed to get the solution in linux bash command like this:
yt-dlp -i "https://www.youtube.com/watch?v=UT5F9AXjwhg" -f 22 -o - | ffmpeg -i - -vsync 0 -filter_complex "[0:v]setpts=2.0*PTS[v];[0:a]atempo=(1/2.0)[a]" -map "[v]" -map "[a]" "slow.mp4"
I also went further and managed to get the slowmotion of a partial video extracted like this:
yt-dlp -i "https://www.youtube.com/watch?v=UT5F9AXjwhg" --download-sections "*30-45" -f 22 -o - | ffmpeg -i - -vsync 0 -filter_complex "[0:v]setpts=2.0*PTS[v];[0:a]atempo=(1/2.0)[a]" -map "[v]" -map "[a]" "slow.mp4"
Now i will use the passthru command of PHP to output the result to the browser
Finally, I will have to extract a part of the video and then concatenate with the slowmotion of that part (using only pipes, without temporary files). Any ideias? -
Hello again
To convert to slow motion in bash shell I managed like this
yt-dlp -f 22 -i "https://www.youtube.com/watch?v=SIX4-JQkLEU" --download-sections "*1:30-2:00" -o - | ffmpeg -i pipe:0 -vsync 0 -filter_complex "[0:v]setpts=2.0*PTS[v];[0:a]atempo=(1/2.0)[a]" -map "[v]" -map "[a]" "slow.mp4"
Somehow, the pipe to ffmpeg does not seem to be working in the web server
I already tried many ways but so far no luck :\The last was was like this:
$cmd="yt-dlp -f 22 -i \"https://www.youtube.com/watch?v=SIX4-JQkLEU\" --download-sections \"*1:30-2:00\" -o - | ffmpeg -i pipe:0 -vsync 0 -filter_complex \"[0:v]setpts=2.0*PTS[v];[0:a]atempo=(1/2.0)[a]\" -map \"[v]\" -map \"[a]\" -f mp4 pipe:1";
and then with PHP passtru command i would do the follwing:
$get_video=passthru($cmd);
I always get a corrupt file with 16bytes :\
I looked at the server logs and I didn't find anything :\
What might be wrong above?
I would appreciate any single help
Thank you in advance
pib -
I managed to find out!
I just had to replace mp4 by mpgets at the end of the command.Last edited by pib; 11th May 2023 at 21:57.
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Another question please. I want to duplicate mp4 video.
In command line I issue the following command:
ffmpeg -i input.mp4 -i input.mp4 -filter_complex "[0:v][0:a][1:v][1:a]concat=n=2:v=1:a=1" -vsync vfr output.mp4
I was trying the following in web environment:
... -o - | ffmpeg -i pipe:0 -i pipe:0 -filter_complex \"[0:v][0:a][1:v][1:a]concat=n=2:v=1:a=1\" -vsync vfr -f mpgets pipe:1";
It does not give any error but it does not duplicate video. What might be wrong?
Can anybody give me an hint? -
Hello
Before I could use YT-dlp to download facebook reels but since the biginning of this month I can't download facebook reels using Yt-dlp.
Anyone knows what has changed? Maybe in facebook video format, no?
I would appreciate any help
Thank you very much in advance.
Pib
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