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

[Andrey Goreev]

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 <aegoreev at 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 <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 Use -pix_fmt yuv420p for compatibility with outdated media players.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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>
>