ffmpeg for EL7

[Ralf Corsepius]

On 08/25/2016 09:10 AM, Nicolas Chauvet wrote:
> 2016-08-25 7:13 GMT+02:00 Ralf Corsepius <rc040203 at freenet.de>:
>> On 08/24/2016 08:19 PM, Orion Poplawski wrote:
>>>
>>>
>>> One suggestion that's been getting more traction on the EPEL side of
>>> things is
>>> to just start with versioned packages that can co-exist.  So start with
>>> ffmpeg2.8 and ffmpeg3.0 from the start.
>>
>>
>> I would suggest to extend this approach to Fedora-24, to make packaging a
>> vlc-2.x possible, because vlc-3.0 in fc24 is "just plain unusable" for me
>> and vlc-2.x doesn't seem to support ffmpeg-3.0.
> Care to explain what's the issue ? works for me here.

Where shall I start? I am having such an amount of, partially serious 
partially less serious problems with it, I am having difficulties in not 
ranting ;)

So, let me just mention 3 most nagging ones:

1. vlc-3 very frequently (almost each time) eats up all memory (incl. 
swap) until the machine runs OOM and starts killing other programs rsp. 
other programs crash and even lockup machine entirely.

2. vlc-3 doesn't scale many videos correctly, which fc23's vlc-2.x had 
displayed correctly.

3. vlc-3 opens a dialog popup for streams it can't handle. vlc-2.x 
simply ignored them.


#1 is the real killer. It happens such kind of frequently I would 
estimate vlc-3.0's MTBF to ~2 minutes.

That said, I have no real idea about the causes, but am pretty sure 
there several causes interacting.

- From having monitored upstream activities, I know upstream vlc is 
struggling with concurrency and deadlock issues.
- From other display/graphics related issues I am having[1], I am also 
pretty sure some low level intel-GPU related stuff is bugged (kernel, 
libvdpau-intel, xorg-x11-*, ...)
- I am observing vlc issuing qt-warnings complaining about "Timers can 
not be stopped from another thread"

> (Gnome3, NVIDIA)

xfce4, Intel IGP (i5-4570)

I haven't seen these issues with xfce4/NVidia, yet.

Ralf

[1]
https://bugzilla.redhat.com/show_bug.cgi?id=1365062
https://bugzilla.redhat.com/show_bug.cgi?id=1366824