[FFmpeg-user] Tips on compressing videos created by GoPro

[Andrey Goreev]

Moritz,

Thanks a lot for the explanation. I think I did post the full console
output.
As for the yuvj420p, does it reduce the quality?
Broader compatibility is one of the things on my priorities list for sure.


Best regards,

On Thu, Oct 19, 2017 at 8:35 AM, Moritz Barsnick <barsnick at gmx.net> wrote:

> (Kieran's mail passed mine. :-))
>
> On Thu, Oct 19, 2017 at 07:33:34 -0600, Andrey Goreev wrote:
> > I have noticed that I get a bunch of warnings when compressing videos
> made
> > by a GoPro camera.
>
> > "Unsupported codec with id 0 for input stream 2"
>
> Let me guess: The files may hold something like geo-positions encoded
> as subtitles, or a timecode track, or something similarly strange or
> proprietary, which ffmpeg cannot handle. This stream is dropped (but
> probably useless to you, unless you miss something in the resulting
> file).
>
> > FFmpeg:
> > "No pixel format specified, yuvj420p for H.264 encoding chosen.
> > Use -pix_fmt yuv420p for compatibility with outdated media players.  "
>
> It means exactly that. Probably (we'll know when we see your complete
> console output) your input was using colorspace yuvj420p, and ffmpeg
> doesn't change this unless you tell it to. This resulting file may be
> fine in VLC, as you point out, but perhaps some fool is using Windows
> Media Player, or some hardware "media player" which doesn't support
> this. For broader compatibility, follow the recommended hint. If you
> don't care, because VLC is fine, then just don't bother. (Some
> developers are in favor of removing this warning. It's reason is that
> there have been many "bug" reports of ffmpeg creating files which had
> "only black output" or the likes, while it was just a compatibility
> problem of the players.)
>
> Cheers,
> Moritz
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