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• How do I copy ALL metadata from flac/mp3 to alac with ffmpeg ? -movflags isn't working, default just copies basic metadata

  24 juillet 2021, par Architekt

  I've spent 2 days now reasearching this and all the info I've found doesn't work. If I do this simple command :

  


  ffmpeg -i test.mp3 -y -vn -c:a alac /storage/test.m4a


  


  it copies the standard tags. The -vn is to disable copying album art, I've given up on that. It's easier to just separately use AtomicParsley to handle it because some of the album art isn't height divisble by 2.

  


  Problem is, I have extra custom tags that I need as well. Not necessarily for this particular track, but for all the vinyl I spent 2 months archiving. I've tried using the -movflags use_metadata_tags option but that didn't do anything. In fact, it completely prevented the copying of any metadata whatsoever. Here's the command I tried :

  


  ffmpeg -i test.mp3 -y -movflags use_metadata_tags -vn -c:a alac /storage/test.m4a


  


  On my Windows machine, if I use Foobar2000 and convert the same file to m4a, it copies ALL metadata, 100% to the resultant m4a file. Sadly, I need to do this from a linux command line, as part of an automation process. Both commands I've tried show output metadata equivalent to the input (sans cover art), so I'm not sure what that's about. In case it helps, here's the full screen output when I use that latter command with the -movflags tag. I'm going to use a pastebin link so as to not clutter this post with the verbose output.

  


  I've tried -map_metadata 0 as well, same results, but that's to be expected as from what I've read that just copies the global/standard tags. This must be possible, otherwise I have no idea how foobar2000 would be able to do it. I'd love to just use that, but alas, as stated, I have to do this on Linux command line for this particular situation.

  


• Adding a background to an in-video visual progress bar with FFMPEG ?

  22 septembre 2023, par Alexei Dom

  Using the answer to Showing in-video visual progress bar with FFMPEG
  


  


  I'm trying to give the progress bar itself a background, so for e.g. the bar will be white and the red progress bar over time will cover it.

  


  My first decision was to apply a drawbox filter, so for my purposes the video is 1280 pixels wide and the duration is 6.027 seconds. I've tried

  


  ffmpeg -i uuid_nordvpn.mp4 -vf "color=c=red:s=1280x30[bar];[0][bar]overlay=-w+(w/6.072733)*t:H-h:shortest=1, drawbox=x=0:y=720-30:width=1280:height=30:thickness=fill:color=white" out.mp4

  


  But I got just the white drawbox filter that was drawn on top of the color filter.

  


  The obvious solution was to swap the color and drawbox filter, but that returns an error Too many inputs specified for the "color" filter, which I guess means you can only use the color filter at the beginning.

  


  I've also tried applying 2 color filters, the other color filter instead of filling up was going down, but you can't apply 2 color filters, again giving the reason Too many inputs specified for the "color" filter.

  


  I'm completely lost at this point, how would I give a background to this filter ?

  


• ffmpeg-python lib's 'run' function works locally but doesn't work in server

  27 décembre 2023, par Fire Deus

  I am using ffmpeg-python library to process video, specifically I had to add watermark to video. Code is very simple :

  


  def set_watermark_to_video(
    video_url: str,
    directory: str,
    filename: str,
    extension: str,
):
    video_input = ffmpeg.input(video_url)
    output_path: str = f"/tmp/{filename}_watermarked.mp4"
    logo_input = ffmpeg.input(vid_mycar_logo_path)
    video_probe = ffmpeg.probe(video_url)
    video_stream = next(
        (
            stream
            for stream in video_probe["streams"]
            if stream["codec_type"] == "video"
        ),
        None,
    )

    logo_probe = ffmpeg.probe("my_logo_path")
    logo_stream = next(
        (stream for stream in logo_probe["streams"] if stream["codec_type"] == "video"),
        None,
    )
    ffmpeg.filter(
        [video_input, logo_input],
        "overlay",
        10,
        video_stream["height"] - logo_stream["height"] - 10,
    ).output(output_path).run(overwrite_output=True)


  


  Exception occurs when .run(overwrite_output=True) function is called.
  
Exception looks like this : ffmpeg._run.Error : ffmpeg error (see stderr output for detail).

  


  When I print exc.stderr the only warning I can see is "Unknown cover type : 0x1."

  


  But this code works perfectly when I run it locally. I am using docker to build my service, so dependencies, versions, etc all the same in both environments.

  


  The version of ffmpeg I'm using is 5.1.4-0+deb12u1

  


  I tried to run code line by line in server and local machine to compare all parameters and values that have been generated. And still they are the same, so I don't understand why this error happens in server