[GTALUG] Last Ubuntu OS Update Breaks ffmpeg

[D. Hugh Redelmeier]

I have no particular knowledge of this, but I'll take a whack at it.

What is libGL?  Read this: <https://dri.freedesktop.org/wiki/libGL/>

It looks as if ffmpeg is trying to use your graphics card to help with
the conversion.

libGL is unable to load a driver.  Since one of the later choices
appears to be a pure-software driver "swrast_dri", your problem isn't
missing hardware.

I'd guess the libgl used by ffmpeg is obsolete and out of sync with
/usr/lib64/dri/.  Or perhaps you are using a 32-bit ffmpeg on a 64-bit
system, or vice versa.

Have a look in /usr/lib64/dri/ and /usr/lib/dri/.  Are both populated?
For example, on my system, I have:
	/usr/lib64/dri/swrast_dri.so

Did you install ffmpeg from the ubuntu repositories?  If not, it might
be out of sync with the other components (like libGL) which do get
updates from the ubuntu repositories.

How did you update ubuntu?  Sometimes you need to use "apt-get dist-upgrade",
not just "upgrade".  (I'm not a Ubuntu expert.)

| From: Stephen via talk <talk at gtalug.org>
| To: GTALUG Talk <talk at gtalug.org>
| 
| And help and/or advise appreciated.
| 
| I am using 18.4 and apply all updates.
| 
| I have been using ffmpeg for many years to convert file formats. I am now
| getting errors that have me confused. Here is the command line:
| 
| ffmpeg -i 101.Cat.avi -c:v libx264 -c:a copy 101.Cat.mp4
| 
| I now get many errors:
| 
| libGL error: unable to load driver: i965_dri.so
| libGL error: driver pointer missing
| libGL error: failed to load driver: i965
| libGL error: unable to load driver: i965_dri.so
| libGL error: driver pointer missing
| libGL error: failed to load driver: i965
| libGL error: unable to load driver: swrast_dri.so
| libGL error: failed to load driver: swrast
| X Error: GLXBadContext
| Request Major code 155 (GLX)
| Request Minor code 6 ()
| Error Serial #55
| Current Serial #54
| 
| I Google the errors and everything seems to focus on bugs in Android Studio
| which I don't use.
| 
| So I am at a loss for how to fix this.