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Questions[video](ubuntu)

Martin Hope
user229552
Asked: 2013-12-29 09:04:33 +0800 CST
  • 192

I simply want to convert files, any format to any format (at the moment, I need to convert MKV to MP4-h264), without losing quality. I don't want to resize (scale) the video, I don't want to change its aspect ratio and I don't want it to lose quality (this is very important); all I want is "to change the format", that's all. Reason: my DVD player won't recognize any formats other than AVI or MP4. I don't care about file size, unless the difference between the input and the output files is absurdly huge. So, how do I do that?

I've already tried programs such as WinFF, Arista, Format Junkie, but their presets always change something which I don't want to be changed (size, aspec ratio, etc.). I'm not really sure, but I think the best way to get what I want is to go with the pure ffmpeg commands. But how?

By the way, Ubuntu 13.04 (64-bit), here. Thanks for your time, guys.

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Martin Hope
maniat1k
Asked: 2011-11-30 03:19:03 +0800 CST
  • 150

Is there a way to change the rotation angle of a video file?

I have a couple of videos in the wrong direction so all I wanted is to correct it.

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Martin Hope
drgrog
Asked: 2011-06-01 03:15:58 +0800 CST
  • 74

Is there a way to check the size of the video memory? Specifically, is there one that works accurately for both integrated GPU's as well as PCI/AGP graphics cards?

Many integrated GPU's have dynamically allocated memory, so the solution would hopefully return either the maximum available video memory or the currently allocated amount. For stand-alone NVidia or ATI cards it would obviously return the total amount of physical GPU RAM.

lspci -v does output memory figures, but I do not believe it is the video memory. I suspect the figure reported is some system memory allocation or block or channel size, but I don't know for sure. You can see in these test results that lspci was wrong in 5 of the 6 tests:

** ASUS EN210 PCIe - 1024 Mb *** 

01:00.0 VGA compatible controller: nVidia Corporation GT218 [GeForce 210] (rev a2)
        Subsystem: ASUSTeK Computer Inc. Device 8354
        Memory at e3000000 (32-bit, non-prefetchable) [size=16M]
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at e0000000 (64-bit, prefetchable) [size=32M]

*** Galaxy 8400GS PCIe - 512 Mb *** 

01:00.0 VGA compatible controller: nVidia Corporation G98 [GeForce 8400 GS] (rev a1)
    Subsystem: nVidia Corporation Device 05cc
    Region 0: Memory at e4000000 (32-bit, non-prefetchable) [size=16M]
    Region 1: Memory at d0000000 (64-bit, prefetchable) [size=256M]
    Region 3: Memory at e2000000 (64-bit, non-prefetchable) [size=32M]

*** VirtualBox VM - 10 Mb (headless server) *** 

00:02.0 VGA compatible controller: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter
        Memory at e0000000 (32-bit, prefetchable) [size=16M]

*** VirtualBox VM - 128 Mb *** 

00:02.0 VGA compatible controller: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter (prog-if 00 [VGA Controller])
        Memory at e0000000 (32-bit, prefetchable) [size=128M]

*** S3 Savage 4 AGP - unknown Mb (old lspci log), but I don't think they made these cards with 128Mb memory! *** 

00:01.0 VGA compatible controller: S3 Inc. Savage 4 (rev 06) (prog-if 00 [VGA controller])
    Subsystem: IBM Unknown device 01c5
    Region 0: Memory at feb80000 (32-bit, non-prefetchable) [size=512K]
    Region 1: Memory at f0000000 (32-bit, prefetchable) [size=128M]

*** NVIDIA Quadro FX 1800 integrated - 1024 Mb *** 

01:00.0 VGA compatible controller: nVidia Corporation GT215 [Quadro FX 1800M] (rev a2) (prog-if 00 [VGA controller])
    Subsystem: Dell Device 040c
    Memory at e2000000 (32-bit, non-prefetchable) [size=16M]
    Memory at d0000000 (64-bit, prefetchable) [size=256M]
    Memory at e0000000 (64-bit, prefetchable) [size=32M]
video