On 05/12/2011 2:03 AM, Maarten Maathuis wrote:
On Sun, Dec 4, 2011 at 6:11 PM, Donald McLachlan
<donald.mclach...@crc.ca> wrote:
Hi,
I don't know where to start to resolve this problem and guessed maybe this
is a good place to start. If not, please point me in the right direction.
Our ultimate goal is to stream 8k resolution video using sage (see
www.sagecommons.org).
- We first used ffmpeg to convert a 4k resolution video file to yuv format,
and we were able to view it with ffplay, mplayer, and crcview (an in house
program).
- We then used ffmpeg to convert/resample the same 4k resolution video file
to yuv/8k resolution; the conversion completed without error.
- When trying to view the resulting yuv/8k resolution file all three viewer
programs failed with the same X Error. For example, here is the output from
ffplay:
ffplay -i Lupe.8k.yuv -s 8192x4320 -pix_fmt yuv420p -x 1920 -y 1080
ffplay version 0.8, Copyright (c) 2003-2011 the FFmpeg developers
built on Nov 30 2011 13:01:22 with gcc 4.5.1 20101208 [gcc-4_5-branch
revision 167585]
configuration:
libavutil 51. 9. 1 / 51. 9. 1
libavcodec 53. 7. 0 / 53. 7. 0
libavformat 53. 4. 0 / 53. 4. 0
libavdevice 53. 1. 1 / 53. 1. 1
libavfilter 2. 23. 0 / 2. 23. 0
libswscale 2. 0. 0 / 2. 0. 0
[rawvideo @ 0x129d740] Estimating duration from bitrate, this may be
inaccurate
Input #0, rawvideo, from 'Lupe.8k.yuv':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0.0: Video: rawvideo, yuv420p, 8192x4320, 25 tbr, 25 tbn, 25 tbc
X Error of failed request: BadLength (poly request too large or internal
Xlib length error)
Major opcode of failed request: 132 (XVideo)
Minor opcode of failed request: 18 ()
Serial number of failed request: 23
Current serial number in output stream: 24
In case it matters, we are using openSuse 11.4 64 bit linux, on an ASUS P6T7
WS Supercomputer motherboard, with 12 G RAM, and a ASUS GTX590 video card.
My guess is the 8k resolution video format is exceeding a buffer size limit
somewhere, either in software, or maybe on the video card.
Is there a way to find out what buffers are affected and is there a way to
overcome these limits?
Thanks for any assistance you can provide,
Don
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If this is using the nouveau driver (check lsmod or xorg log), i see
that for some reason that it's limited to 4096x4096 for xvideo.
See this line:
http://cgit.freedesktop.org/nouveau/xf86-video-nouveau/tree/src/nouveau_xv.c#n2031
And then check the contents of DummyEncodingTex and you'll find it
refers to the maximum sizes.
The command xvinfo confirms this.
NV50 and higher (everything starting geforce 8) are able to do
8192x8192, it should just be a matter of making a NV50 specific
DummyEncodingTex structure.
Hi Maaten,
I believe we replaced the nouveau driver with the nvidia driver, but I
will double check.
I will run the xvinfo command to see what it says limits are.
- If need be I guess we could revert to the nouveau driver and modify
the DummyEncodingTex structure.
- Does anyone know if there something similar we can do with the nvidia
driver to enable 8k? (I guess maybe Nvidia are the ones to ask. :-) )
Thanks, and I'll let you know how it goes,
Don
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