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Sur d’autres sites (9125)

  • FFMPEG MP4 from a m3u8 stream results in a few black frames

    14 avril 2020, par roosevelt

    I'm noticing an odd behavior and not sure how to tackle it through FFMPEG. Basically, I'm downloading some ts files from a stream and making an MP4 out of them. I don't need to encode them since they are already encoded.

    



    Here's the command :

    



    ffmpeg -nostdin -y -ss 3 -i https://d2nvs31859zcd8.cloudfront.net/d33af82762361135e8ba_yassuo_37349116016_1403122741/chunked/index-muted-EIVFBWYS1V.m3u8 -t 50 -c copy Test.mp4


    



    If I run the MP4 file in Quicktime player, it seems like there are one or two black frames in the beginning. How do I get rid of that using the above command ?

    



    I also tried downloading the .ts files and concat them via FFMPEG. But the result is the same. First few frames are black.

    



    ffmpeg -nostdin -y -i "concat:0.ts|1.ts|2.ts|3.ts|4.ts|5.ts|6.ts" -c copy Test2.mp4


    



    Seems like VLC doesn't show the black frame but it's apparent on the Quicktime player.

    



    Thanks

    


  • How to automatically remove black bars using ffmpeg from a Powershell script ?

    27 avril 2021, par timlwsk

    Thanks to the help of the user mklement0 I got this script to automatically convert all files in the folder "video_old" and move them into "video_new", all while keeping the original filename. Original Post.

    



    Now I want to remove the black bars in the container. I know that there is "cropdetect" but AFAIK you have to manually parse the the value into the script. What parameter should I add to bellow's ffmpeg execution ?

    



    Get-ChildItem .\video_old -Filter *.mkv | ForEach-Object {
  .\ffmpeg.exe -i $_.FullName -c:v libx265 -crf 18 ".\video_new\$($_.Name)"
}


    



    Parameters used to remove the bars

    



    ffmpeg -ss 90 -i input.mkv -vframes 10 -vf cropdetect -f null -
...
[Parsed_cropdetect_0 @ 0x220cdc0] x1:0 x2:1279 y1:0 y2:719 w:1280 h:720 x:0 y:0 pts:215 t:0.215000 crop=1280:720:0:0
[Parsed_cropdetect_0 @ 0x220cdc0] x1:0 x2:1279 y1:0 y2:719 w:1280 h:720 x:0 y:0 pts:257 t:0.257000 crop=1280:720:0:0
[Parsed_cropdetect_0 @ 0x220cdc0] x1:0 x2:1279 y1:0 y2:719 w:1280 h:720 x:0 y:0 pts:299 t:0.299000 crop=1280:720:0:0


    



    In this example, we can apply the filter like this :

    



    ffmpeg -i input.mkv -vf crop=1280:720:0:0 -c:a copy output.mkv


    



    OriginalPost

    



    Screenshot

    



    Example screenshot from one of the files

    


  • How to automatically remove black bars using ffmpeg and powershell ?

    7 avril 2020, par timlwsk

    Thanks to the help of the user mklement0 I got this script to automatically convert all files in the folder "video_old" and move them into "video_new", all while keeping the original filename. Original Post.

    



    Now I want to remove the black bars in the container. I know that there is "cropdetect" but AFAIK you have to manually parse the the value into the script manually. How can I automate this process using PowerShell ?

    



    Get-ChildItem .\video_old -Filter *.mkv | ForEach-Object {
  .\ffmpeg.exe -i $_.FullName -c:v libx265 -crf 18 ".\video_new\$($_.Name)"
}


    


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