Fix ffmpeg compilation for rtd1296 architecture

[m4tt075]

Motivation: ffmpeg compilation has been broken for rtd1296 platform and all packages depending on ffmpeg. This PR fixes those issue. x264 has been upgraded to the most recent stable snapshot in the process as well. Untested so far, as I do not own a rtd1296 device.

Checklist

• Build rule completed successfully for rtd1296 architecture
• Build rule all-supported completed successfully
• Package upgrade completed successfully
• New installation of package completed successfully

[m4tt075]

@ymartin59 Gave it another try and got it working, but please review...

[Safihre]

Is the disable-nepn required? Because Neon can make a huge performance impact, as far as I know from general programming. It's like SSE2/3 of ARM, so it seems very important on low power devices and I'm pretty sure this platform should support it.

[ymartin59]

According to https://developer.arm.com/technologies/neon we should consider NEON is available for both ARMv7 and ARMv8.
I propose to give a try to remove --disable-neon flag for these two architecture.
May you please build for rtd1297 this PR and submit to requester for "beta" testing ?

[ymartin59]

Reference to requesters: #2997 #3083 #2886 #2981 #3079

[ymartin59]

I have built and submitted package for testing

[m4tt075]

Yes, makes sense. Just pushed the changes. Building here.

[Idree]

Hello, i am betatesting your package :)

I just installed it on my DS216play which is packed with an rtd1296 and video's with DTS seems to be working.

Amazing work 👍

[Safihre]

@m4tt075 any idea why all the x86/64 toolchains fail? Can't really read the log well here on mobile.

[m4tt075]

@Safihre Yes, found it. Working on it. Pushing update soon...

[m4tt075]

Next build attempts here

[ymartin59]

Already one user reported rtd1296 package works well

[ymartin59]

I have to review my pending branches with some updates related to ffmpeg, mediainfo and chromaprint

[m4tt075]

OK, all 6.1 builds are green. Test packages are here.

@ymartin59 Feel free to cherry-pick my commits into a bigger ffmpeg update PR if you like to. I will be AFK for most of next week. And I know there is more we could do (update to 3.4.1, hw acceleration support for transcoding, specific patches which are only applied when it is compiled as part of TVH).

[ymartin59]

@m4tt075 Thanks a lot. That is my idea. I take opportunity to update as much as possible because of publication process cost...

[Safihre]

@ymartin59 why not use the (Docker based) Travis image to do the publishing? You can add your SynoCommunity login details as a Travis secret/encrypted environment variable.
This is also how we do it for the SABnzbd releases.

[ymartin59]

Replaced by #3136. Unfortunately no longer builds for DSM 5.2