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

Gyan Doshi gyandoshi at gmail.com
Thu Oct 19 17:40:49 EEST 2017

On 10/19/2017 8:05 PM, Moritz Barsnick wrote:
>> FFmpeg:
>> "No pixel format specified, yuvj420p for H.264 encoding chosen.
>> Use -pix_fmt yuv420p for compatibility with outdated media players.  "
> 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.

Are there any players unable to decode this stream, as opposed to 
rendering it naively i.e. without rescaling the values? Don't believe so.

> (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.)

The warning was removed quite a while ago.

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