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• ffmpeg : is there a simple way to edit the video resolution, but keep all audio and subtitles

  21 avril 2022, par Arkeen

  I would like to lower video resolution - usually from .mkv files - but to keep all possible audio tracks (might be only one, might be several) and subtitles (might be none, might be several) from the original one. I also would like to keep as many encoding parameters as I can from the original video file (especially those I do not understand).

  


  I am still new to ffmpeg : at first the idea seemed simple, but after many attempts, it seems it is more complex than that. Do I have to use the -filter_complex option ? It seems to be an overkill (or overcomplex) for what I thought to be an easy conversion, but I might be wrong.

  


  I tried to combine -vf scale=-1:720 with -c copy -map 0, which gave me an error that I now understand, but I am stuck with the next step.

  


  Any lead on to achieve that ? Could it be done with ffmpeg only or would I need a script ?

  


• Fix flv files that stop early

  19 octobre 2012, par Xonar

  I downloaded some flv videos some time ago and when watching them they stop at a point. If I skip past that point they continue playing fine up until another point which I can then skip past again (and the cycle goes on until the end of the video)

  I already tried

  avconv -i input.flv -acodec copy -vcodec copy -g 1 output.flv

  To my understanding from reading alot of mostly useless posts regarding this issue the there isn't any keyframes in my metadata and then stop when there is a bad frame.

  I tried setting -g higher but output.flv stops at the same point as where the original file stops for the first time. Is there any tool that can fix this.

  I can't remember where the original links are located and re-downloading isn't a option and as you can see my re-encoding attempts has failed.

  I am using Linux Ubuntu, so I can't use the Windows tools that are available.

• Background blur on concat videos make everything more blurry

  7 août 2020, par AlphaDjango

  Hi I have a bunch of temp video files that I want to concat together, some are different aspect ratios and resolutions so I want the end video to be a 1920x1080p with the empty space on the sides to be a box blur.

  


  I have it working how I want but the video clips in the middle become more blurry than the original temp files.
Could someone let me know if I can change the code to keep original quality ? It will also show it's dropping frames a few thousand in a 20 minute video which isn't terrible but I would prefer it to not drop frames.

  


  "ffmpeg -i "concat :" + python script adds all file locations + "" -s 1920x1080 -filter_complex [0:v]scale=ih16/9 :-1,boxblur=luma_radius=min(h,w)/20:luma_power=2:chroma_radius=min(cw,ch)/20:chroma_power=1[bg] ;[bg][0:v]overlay=(W-w)/2 :(H-h)/2,crop=h=iw9/16 -af aselect=concatdec_select,aresample=async=1 Rendered_Videos/output.mp4"