I wrote a script to compress all my videos (posted here: https://github.com/AndriusWild/dam_scripts look for compress2mp4.sh) I guess I will have to invest more time in it and make it use different FFmpeg commands depending on the input...
Best regards, On Thu, Oct 19, 2017 at 9:33 AM, Andrey Goreev <aegor...@gmail.com> wrote: > 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 <barsn...@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 Use -pix_fmt yuv420p for compatibility with outdated media players.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 >> _______________________________________________ >> ffmpeg-user mailing list >> ffmpeg-user@ffmpeg.org >> http://ffmpeg.org/mailman/listinfo/ffmpeg-user >> >> To unsubscribe, visit link above, or email >> ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > > > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
