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

[Carl Eugen Hoyos]

2017-10-19 16:40 GMT+02:00 Gyan Doshi <gyandoshi at gmail.com>:
> 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 Use -pix_fmt yuv420p for compatibility with outdated media players.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.

The more useful question is if there are players that respect the
signal...
(At least some versions of QT and WMP show the videos with
incorrect colours.)

>> (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.

You sound as if you are happy with the removal?

Carl Eugen