How to improve HD TV and video?

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Thanks for your reply. I stripped from the output what looks irrelevant to my question. Let me know if more information is needed.

Code:

System:    Kernel: 3.19.0-33-generic x86_64 (64 bit, gcc: 4.8.2)
           Desktop: Xfce 4.11.8 (Gtk 2.24.23) info: xfce4-panel dm: lightdm Distro: Ubuntu 14.04 trusty
CPU:       Dual core Intel Core2 CPU 6300 (-MCP-) cache: 2048 KB flags: (lm nx sse sse2 sse3 ssse3 vmx) bmips: 7466.38
           Clock Speeds: 1: 1600.00 MHz 2: 1600.00 MHz
Graphics:  Card: Advanced Micro Devices [AMD/ATI] RV730 PRO [Radeon HD 4650] bus-ID: 01:00.0 chip-ID: 1002:9498
           X.Org: 1.17.1 drivers: ati,radeon (unloaded: fbdev,vesa) Resolution: [email protected]
           GLX Renderer: Gallium 0.4 on AMD RV730 GLX Version: 3.0 Mesa 10.5.9 Direct Rendering: Yes
Audio:     Card-1: Intel 82801H (ICH8 Family) HD Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0 chip-ID: 8086:284b
           Card-2: Advanced Micro Devices [AMD/ATI] RV710/730 HDMI Audio [Radeon HD 4000 series]
           driver: snd_hda_intel bus-ID: 01:00.1 chip-ID: 1002:aa38
           Sound: Advanced Linux Sound Architecture ver: k3.19.0-33-generic
Info:      Processes: 221 Uptime: 10:14 Memory: 1585.5/7983.2MB Runlevel: 2 Gcc sys: 4.8.4 alt: 4.4/4.6/4.7/4.9
           Client: Shell (bash 4.3.11 running in x-terminal-emul) inxi: 1.9.17

In addition to that, I also have a DVB-T card:

Code:

Multimedia controller: Philips Semiconductors SAA7131/SAA7133/SAA7135 Video Broadcast Decoder (rev d1)

I'm using VLC as offline video player.

Code:

VLC media player 2.1.6 Rincewind (revision 2.1.6-0-gea01d28)
VLC version 2.1.6 Rincewind (2.1.6-0-gea01d28)
Compiled by buildd on lcy01-24.buildd (Aug 11 2017 14:21:28)
Compiler: gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3)

And, for Web content:

Code:

Chromium    61.0.3163.79 (Built on Ubuntu , running on Ubuntu 14.04)
Flash plugin    27.0.0.130 /usr/lib/adobe-flashplugin/libpepflashplayer.so
--- GPU driver, more information ---
Vendor Id    0x1002
Device Id    0x9498
Driver vendor    Google Inc.
Driver version    3.3.0.2
Driver date    2017/04/07
Pixel shader version    3.0
Vertex shader version    3.0
GL_VENDOR    Google Inc.
GL_RENDERER    Google SwiftShader
GL_VERSION    OpenGL ES 2.0 SwiftShader
GL_EXTENSIONS