Can't specify output filename with -x

[jocelynke]

Hi,

I can't specify a static filename when I'm extracting the audio of a video :
./youtube_dl -xcik -f 139 --restrict-filenames --audio-format mp3 -o "download" http://www.youtube.com/XXXXXX

Or maybe I'm missing an option. The error reported is
youtube_dl: error: Cannot download a video and extract audio into the same file! Use "%(ext)s" instead of u'download'

[EveryDirection]

It looks like you're trying to download both a video and an audio stream, and they are both attempting to download to the file "download", so there's a conflict. Try replacing

-o "download"

in your command with

-o "download.%(ext)s"

so that the streams get downloaded to files with different extensions.

[jaimeMF]

@EveryDirection is right, you have to specify the extension, using download.%(ext)s or download.mp4 if that's the video's format, but the first one is safer. I have improved the error message, it will now say Use "download.%(ext)s" instead of "download" as the output template.

[jocelynke]

Thanks guys !

But just to make it clear, with my command, I thought it would download the video with format 139, and then extract the audio as an mp3 file, @EveryDirection said it was going to download video AND audio, could you give me some explanation please ?

[jaimeMF]

You're right, I think that @EveryDirection meant that you were trying to write the extracted audio and the original video to the same file, that's why you saw the error message, because it's not possible.

[jocelynke]

Ok I understand better now. Thank you very much