<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-size:small">VERY LIMITED hardware acceleration for rendering has been checked into GIT and a description is included below that will eventually make it into the manual. Limitations are described there and why, but here is a one line summary.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small"><b>If you have an Intel computer with Intel graphics board and render to mp4, you can take advantage of this.</b> <br></div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">We have no hardware to test Intel computer with Nvidia graphics board but are assuming that it will not work. An AMD computer with the Nvidia graphics board installed does not work (not implemented). If you can prove me wrong, I would really like to hear that!</div><div class="gmail_default" style="font-size:small"></div><div class="gmail_default" style="font-size:small"><span></span>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font size="2">The following URL, although
not generic for all operating systems, does provide a Comparison
tables for ascertaining whether or not the VA-API will work for your
specific hardware. <i> Do not be fooled by the GE Force listed in the Decoding section </i>-- it does not appear in the Encoding section. The table is about
2/3 of the way down the article.<br></font></p><font size="2">
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<font size="2"><a href="https://wiki.archlinux.org/index.php/Hardware_video_acceleration" style="color:rgb(0,0,128);text-decoration:underline">https://wiki.archlinux.org/index.php/Hardware_video_acceleration</a></font>
</p><font size="2">
</font><p style="font-weight:normal;margin-bottom:0.1in;line-height:115%;background:transparent none repeat scroll 0% 0%">@Ubuntu16 users: there is a test build at:</p><p style="font-weight:normal;margin-bottom:0.1in;line-height:115%;background:transparent none repeat scroll 0% 0%"> <a href="https://www.cinelerra-gg.org/download/testing/cinelerra-5.1-ub16-x86_64-static.txz">https://www.cinelerra-gg.org/download/testing/cinelerra-5.1-ub16-x86_64-static.txz</a></p><p style="font-weight:normal;margin-bottom:0.1in;line-height:115%;background:transparent none repeat scroll 0% 0%">@Pierre: if someone lets us know that it works on an Intel computer with Nvidia graphics, gg will make a Mint18 build but otherwise prepare to be disappointed. :)<br></p><p style="font-weight:normal;margin-bottom:0.1in;line-height:115%;background:transparent none repeat scroll 0% 0%">@Andrea: we did look a little bit at OpenCL but got the impression that the overhead may be too much and that it it seems to only help with filters.</p><p style="font-weight:normal;margin-bottom:0.1in;line-height:115%;background:transparent none repeat scroll 0% 0%">@Andrew: thanks for your last email on this subject as it provided the useful vdpauinfo amongst other things.</p><p style="font-weight:normal;margin-bottom:0.1in;line-height:115%;background:transparent none repeat scroll 0% 0%">-----------------------------------------------------------</p><p style="font-weight:normal;margin-bottom:0.1in;line-height:115%;background:transparent none repeat scroll 0% 0%">
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<font style="font-size:14pt" size="4"><b>Rendering with Hardware
Acceleration / Encoding using VA-API</b></font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3">Encoding using hardware
acceleration of your graphics board GPU is included in CinelerraGG
but it is of limited availability and may be exclusive to only a
particular set of hardware graphics boards and only with certain
ffmpeg formats. The encoding is done via vaapi (libva installed),
which is known to work with Intel HD graphics board and some others.
Usage of encoding as developed by Nvidia is not included with CinGG
because ffmpeg has to be compiled with the <i>non-free </i>option and
that goes against GPL. In addition the Nvidia encoding, referred to
as <i>nvenc, </i>requires proprietary libraries to be installed.</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<br>
</p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3">To use hardware acceleration
for rendering (that is, encoding) you do not have to set a preference
or an environment variable, as used by decoding. To use this feature
you must use an ffmpeg render options file which specifies a vaapi
codec, such as h264_vaapi. You must also include the line in the
file to trigger the hardware probe: cin_hw_dev=vaapi</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<br>
</p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3">There are currently 4 options
files available in the Render menu already set up for you that you see
when you select the Video wrench and use the down arrow on the first
line in the menu. These are:</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<br>
</p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3"> h264_vaapi.mp4 # known to
work on Intel computer with Intel Broadwell graphics driver</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3"> mpeg2_vaapi.mp4 # known to
work on Intel computer with Intel Broadwell graphics driver</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3"> mjpeg_vaapi.mp4 # error
message of “open failed with mjpeg_vaapi...” on above computer</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3"> hevc_vaapi.mp4 # error
message of “open failed with hevc_vaapi...” on above computer</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<br>
</p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3">Other option files can be
added as needed for your specific hardware if it is known to work for
you, such as VP8 and VP9. The contents of the included cinelerra’s
ffmpeg/video/h264_vaapi.mp4 file:</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<br>
</p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3"> mp4 h264_vaapi</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3"> cin_hw_dev=vaapi</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3"> profile=high</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<br>
</p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3">According to an online wiki,
hardware encoders usually create output of lower quality than some
software encoders like x264, but are much faster and use less CPU.
Keep this in mind as you might want to set a higher bitrate to get
output of similar visual quality.</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<br>
</p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3">Results of a particular test
case performed on a Intel, 4-core computer, with Broadwell Graphics
using an mp4 input video/audio file with dimensions of 1440x1080 /
29.97fps is shown next (note, tutorial.mp4). This may very well be a
“best case” scenario! But clearly, at least on this computer
with only 4 cores, the hardware acceleration seems to be
advantageous. A comparison of the 2 output files using ydiff (as
described in Appendix C in the manual) shows no obvious defects.</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<br>
</p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3"> <u>CPU usage</u> <u>Render
Time</u> <u>Output File Size</u> <u>Options File</u></font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3">Without Hardware Acceleration
388% 100 secs. 36,862,542 h264.mp4</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
</p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<font style="font-size:12pt" size="3">With vaapi Harware
Acceleration 150% 19 secs. 74,522,736
h264_vaapi.mp4</font></p>
<p style="margin-bottom:0in;font-weight:normal;line-height:100%;background:transparent none repeat scroll 0% 0%">
<br>
</p>
<p style="font-weight:normal;margin-bottom:0.1in;line-height:115%;background:transparent none repeat scroll 0% 0%"><br></p><p style="font-weight:normal;margin-bottom:0.1in;line-height:115%;background:transparent none repeat scroll 0% 0%">
<br>
</p>
</div><div class="gmail_default" style="font-size:small"><br></div></div></div>