System: i5 6600K, 1050TI, Ubuntu 18.04, Kernel 4.16
I have successfully compiled mlt and ffmpeg with nvenc support using the official nvenc headers stripped from the Nvidia SDK.
Rendering the first minute of the 1080p Sintel version, with 4 threads specified and my nvenc profile, finishes in 10 seconds.
Sintel can be downloaded here: https://durian.blender.org/download/
Nvenc Profile: (compatible with recent mlt versions who are nvenc enabled by deafult)

Code: Select all

f=mp4 vcodec=nvenc_h264 global_quality=21 vq=21 preset=slow bf=2 ab=384k

If you do not wish to compile mlt by yourself, you can also use the melt binary from the latest Shotcut version, intructions here: https://www.youtube.com/watch?v=X14GvmBpq08

Now here is the problem that I do not understand:
Using the latest version of kdenlive from the kdenlive-master ppa combined with the newly compiled versions of ffmpeg and mlt works perfectly, but only under very specific circumstances.

I have only been able to get rendering with nvenc to work properly when I use and open this specific kdenlive save file which I made of the first minute of the Sintel short film with the Appimage Version of Kdenlive. After launching the ppa/installed version of kdenlive and opening this save file, rendering with nvenc works flawlessly.

If I simply start a new project, adding the whole Sintel short film to the project bin, cutting the first minute and render it, nvenc simply does not work and the render time is tripled, despite having changed nothing else, including the nvenc render profile.

If I create a save file of the first minute of Sintel with the installed version and open it on the Appimage version, nvenc does not work again.

Conclusion: There must be something in this save file, maybe a parameter, additonal settings or any type of code not present in the default kdenlive project profiles, which enables NVENC.

I would greatly appreciate it if we could find out the source of this problem together.

Kdenlive Appimage Save File with which NVENC work:
Download:https://www.file-upload.net/download-13231504/sintel-save.kdenlive.html

Code: Select all

<?xml version='1.0' encoding='utf-8'?>
<mlt title="Anonymous Submission" version="6.7.0" root="/home/name/Documents" producer="main bin" LC_NUMERIC="en_US.UTF-8">
 <profile width="1920" frame_rate_den="1" height="1080" display_aspect_num="16" display_aspect_den="9" frame_rate_num="60" colorspace="709" sample_aspect_den="1" description="HD 1080p 60 fps" progressive="1" sample_aspect_num="1"/>
 <producer id="1" title="Anonymous Submission" out="53281" in="0">
  <property name="length">53282</property>
  <property name="eof">pause</property>
  <property name="resource">/home/name/Downloads/Sintel.2010.1080p.mkv</property>
  <property name="meta.media.nb_streams">12</property>
  <property name="meta.media.0.stream.type">video</property>
  <property name="meta.media.0.stream.frame_rate">24</property>
  <property name="meta.media.0.stream.sample_aspect_ratio">1</property>
  <property name="meta.media.0.codec.width">1920</property>
  <property name="meta.media.0.codec.height">818</property>
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  <property name="mlt_service">avformat-novalidate</property>
  <property name="meta.media.frame_rate_num">24</property>
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  <property name="meta.media.colorspace">709</property>
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  <property name="kdenlive:docproperties.renderurl">untitled.mp4</property>
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  <entry out="53281" producer="1" in="0"/>
 </playlist>
 <producer id="black" out="53302" in="0">
  <property name="length">53303</property>
  <property name="eof">pause</property>
  <property name="resource">black</property>
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  <property name="mlt_service">colour</property>
  <property name="set.test_audio">0</property>
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  <property name="kdenlive:track_name">Video 3</property>
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 <producer id="1_playlist7" title="Anonymous Submission" out="53281" in="0">
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  <property name="eof">pause</property>
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  <property name="meta.media.0.codec.frame_rate">24</property>
  <property name="meta.media.0.codec.pix_fmt">yuv420p</property>
  <property name="meta.media.0.codec.sample_aspect_ratio">0</property>
  <property name="meta.media.0.codec.colorspace">709</property>
  <property name="meta.media.0.codec.name">h264</property>
  <property name="meta.media.0.codec.long_name">H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10</property>
  <property name="meta.media.0.codec.bit_rate">0</property>
  <property name="meta.attr.0.stream.language.markup">eng</property>
  <property name="meta.media.1.stream.type">audio</property>
  <property name="meta.media.1.codec.sample_fmt">fltp</property>
  <property name="meta.media.1.codec.sample_rate">48000</property>
  <property name="meta.media.1.codec.channels">6</property>
  <property name="meta.media.1.codec.name">ac3</property>
  <property name="meta.media.1.codec.long_name">ATSC A/52A (AC-3)</property>
  <property name="meta.media.1.codec.bit_rate">640000</property>
  <property name="meta.attr.1.stream.language.markup">eng</property>
  <property name="meta.attr.1.stream.title.markup">AC3 5.1 @ 640 Kbps</property>
  <property name="meta.media.2.codec.name">srt</property>
  <property name="meta.media.2.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.2.codec.bit_rate">0</property>
  <property name="meta.attr.2.stream.language.markup">ger</property>
  <property name="meta.media.3.codec.name">srt</property>
  <property name="meta.media.3.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.3.codec.bit_rate">0</property>
  <property name="meta.attr.3.stream.language.markup">eng</property>
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  <property name="meta.media.4.codec.long_name">SubRip subtitle</property>
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  <property name="meta.attr.4.stream.language.markup">spa</property>
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  <property name="meta.attr.9.stream.language.markup">por</property>
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  <property name="meta.media.10.codec.long_name">SubRip subtitle</property>
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  <property name="meta.attr.11.stream.language.markup">vie</property>
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  <transition id="transition12">
   <property name="a_track">0</property>
   <property name="b_track">8</property>
   <property name="compositing">0</property>
   <property name="distort">0</property>
   <property name="rotate_center">0</property>
   <property name="mlt_service">qtblend</property>
   <property name="internal_added">237</property>
  </transition>
 </tractor>
</mlt>


PPA/Installed Version of Kdenlive which breaks NVENC:

Code: Select all

<?xml version='1.0' encoding='utf-8'?>
<mlt title="Anonymous Submission" version="6.10.0" root="/home/name/Documents" producer="main bin" LC_NUMERIC="en_US.UTF-8">
 <profile width="1920" frame_rate_den="1001" height="1080" display_aspect_num="16" display_aspect_den="9" frame_rate_num="30000" colorspace="709" sample_aspect_den="1" description="HD 1080p 29.97 fps" progressive="1" sample_aspect_num="1"/>
 <producer id="1" title="Anonymous Submission" out="26613" in="0">
  <property name="length">00:14:48;00</property>
  <property name="eof">pause</property>
  <property name="resource">/home/name/Downloads/Sintel.2010.1080p.mkv</property>
  <property name="meta.media.nb_streams">12</property>
  <property name="meta.media.0.stream.type">video</property>
  <property name="meta.media.0.stream.frame_rate">24</property>
  <property name="meta.media.0.stream.sample_aspect_ratio">1</property>
  <property name="meta.media.0.codec.width">1920</property>
  <property name="meta.media.0.codec.height">818</property>
  <property name="meta.media.0.codec.rotate">0</property>
  <property name="meta.media.0.codec.frame_rate">24</property>
  <property name="meta.media.0.codec.pix_fmt">yuv420p</property>
  <property name="meta.media.0.codec.sample_aspect_ratio">0</property>
  <property name="meta.media.0.codec.colorspace">709</property>
  <property name="meta.media.0.codec.name">h264</property>
  <property name="meta.media.0.codec.long_name">H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10</property>
  <property name="meta.media.0.codec.bit_rate">0</property>
  <property name="meta.attr.0.stream.language.markup">eng</property>
  <property name="meta.media.1.stream.type">audio</property>
  <property name="meta.media.1.codec.sample_fmt">fltp</property>
  <property name="meta.media.1.codec.sample_rate">48000</property>
  <property name="meta.media.1.codec.channels">6</property>
  <property name="meta.media.1.codec.name">ac3</property>
  <property name="meta.media.1.codec.long_name">ATSC A/52A (AC-3)</property>
  <property name="meta.media.1.codec.bit_rate">640000</property>
  <property name="meta.attr.1.stream.language.markup">eng</property>
  <property name="meta.attr.1.stream.title.markup">AC3 5.1 @ 640 Kbps</property>
  <property name="meta.media.2.codec.name">srt</property>
  <property name="meta.media.2.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.2.codec.bit_rate">0</property>
  <property name="meta.attr.2.stream.language.markup">ger</property>
  <property name="meta.media.3.codec.name">srt</property>
  <property name="meta.media.3.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.3.codec.bit_rate">0</property>
  <property name="meta.attr.3.stream.language.markup">eng</property>
  <property name="meta.media.4.codec.name">srt</property>
  <property name="meta.media.4.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.4.codec.bit_rate">0</property>
  <property name="meta.attr.4.stream.language.markup">spa</property>
  <property name="meta.media.5.codec.name">srt</property>
  <property name="meta.media.5.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.5.codec.bit_rate">0</property>
  <property name="meta.attr.5.stream.language.markup">fre</property>
  <property name="meta.media.6.codec.name">srt</property>
  <property name="meta.media.6.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.6.codec.bit_rate">0</property>
  <property name="meta.attr.6.stream.language.markup">ita</property>
  <property name="meta.media.7.codec.name">srt</property>
  <property name="meta.media.7.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.7.codec.bit_rate">0</property>
  <property name="meta.attr.7.stream.language.markup">dut</property>
  <property name="meta.media.8.codec.name">srt</property>
  <property name="meta.media.8.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.8.codec.bit_rate">0</property>
  <property name="meta.attr.8.stream.language.markup">pol</property>
  <property name="meta.media.9.codec.name">srt</property>
  <property name="meta.media.9.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.9.codec.bit_rate">0</property>
  <property name="meta.attr.9.stream.language.markup">por</property>
  <property name="meta.media.10.codec.name">srt</property>
  <property name="meta.media.10.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.10.codec.bit_rate">0</property>
  <property name="meta.attr.10.stream.language.markup">rus</property>
  <property name="meta.media.11.codec.name">srt</property>
  <property name="meta.media.11.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.11.codec.bit_rate">0</property>
  <property name="meta.attr.11.stream.language.markup">vie</property>
  <property name="meta.attr.encoder.markup">libebml v1.0.0 + libmatroska v1.0.0</property>
  <property name="meta.attr.creation_time.markup">2011-04-25T12:57:46.000000Z</property>
  <property name="seekable">1</property>
  <property name="meta.media.sample_aspect_num">1</property>
  <property name="meta.media.sample_aspect_den">1</property>
  <property name="aspect_ratio">1</property>
  <property name="audio_index">1</property>
  <property name="video_index">0</property>
  <property name="mute_on_pause">1</property>
  <property name="mlt_service">avformat-novalidate</property>
  <property name="meta.media.frame_rate_num">24</property>
  <property name="meta.media.frame_rate_den">1</property>
  <property name="meta.media.colorspace">709</property>
  <property name="meta.media.color_trc">2</property>
  <property name="meta.media.width">1920</property>
  <property name="meta.media.height">818</property>
  <property name="meta.media.top_field_first">0</property>
  <property name="meta.media.progressive">1</property>
  <property name="kdenlive:file_size">1172428172</property>
  <property name="kdenlive:file_size">1172428172</property>
  <property name="kdenlive:file_hash">611d01670021640fc377b35f918a467b</property>
  <property name="global_feed">1</property>
 </producer>
 <playlist id="main bin">
  <property name="kdenlive:docproperties.audiotargettrack">2</property>
  <property name="kdenlive:docproperties.decimalPoint">.</property>
  <property name="kdenlive:docproperties.dirtypreviewchunks"/>
  <property name="kdenlive:docproperties.disablepreview">0</property>
  <property name="kdenlive:docproperties.documentid">1531690579296</property>
  <property name="kdenlive:docproperties.enableproxy">0</property>
  <property name="kdenlive:docproperties.generateimageproxy">0</property>
  <property name="kdenlive:docproperties.generateproxy">0</property>
  <property name="kdenlive:docproperties.kdenliveversion">18.07.70</property>
  <property name="kdenlive:docproperties.position">1888</property>
  <property name="kdenlive:docproperties.previewchunks"/>
  <property name="kdenlive:docproperties.previewextension"/>
  <property name="kdenlive:docproperties.previewparameters"/>
  <property name="kdenlive:docproperties.profile">atsc_1080p_2997</property>
  <property name="kdenlive:docproperties.proxyextension">mkv</property>
  <property name="kdenlive:docproperties.proxyimageminsize">2000</property>
  <property name="kdenlive:docproperties.proxyminsize">1000</property>
  <property name="kdenlive:docproperties.proxyparams">-vf yadif,scale=960:-2 -qscale 3 -vcodec mjpeg -acodec pcm_s16le</property>
  <property name="kdenlive:docproperties.version">0.96</property>
  <property name="kdenlive:docproperties.verticalzoom">1</property>
  <property name="kdenlive:docproperties.videotargettrack">3</property>
  <property name="kdenlive:docproperties.zonein">0</property>
  <property name="kdenlive:docproperties.zoneout">100</property>
  <property name="kdenlive:docproperties.zoom">7</property>
  <property name="kdenlive:documentnotes"/>
  <property name="kdenlive:clipgroups"/>
  <property name="xml_retain">1</property>
  <entry out="26613" producer="1" in="0"/>
 </playlist>
 <producer id="black" out="26613" in="0">
  <property name="length">26614</property>
  <property name="eof">pause</property>
  <property name="resource">black</property>
  <property name="aspect_ratio">0</property>
  <property name="mlt_service">colour</property>
  <property name="set.test_audio">0</property>
 </producer>
 <playlist id="black_track">
  <entry out="1888" producer="black" in="0"/>
 </playlist>
 <playlist id="playlist1">
  <property name="kdenlive:track_name">Audio 2</property>
  <property name="kdenlive:audio_track">1</property>
 </playlist>
 <playlist id="playlist2">
  <property name="kdenlive:track_name">Audio 1</property>
  <property name="kdenlive:audio_track">1</property>
 </playlist>
 <playlist id="playlist3">
  <property name="kdenlive:track_name">Video 1</property>
 </playlist>
 <producer id="1_playlist4" title="Anonymous Submission" out="26612" in="0">
  <property name="length">00:14:48;00</property>
  <property name="eof">pause</property>
  <property name="resource">/home/name/Downloads/Sintel.2010.1080p.mkv</property>
  <property name="audio_index">1</property>
  <property name="video_index">0</property>
  <property name="mute_on_pause">1</property>
  <property name="mlt_service">avformat-novalidate</property>
  <property name="seekable">1</property>
  <property name="aspect_ratio">1</property>
  <property name="kdenlive:file_size">1172428172</property>
  <property name="kdenlive:file_hash">611d01670021640fc377b35f918a467b</property>
  <property name="global_feed">1</property>
  <property name="xml">was here</property>
  <property name="meta.media.nb_streams">12</property>
  <property name="meta.media.0.stream.type">video</property>
  <property name="meta.media.0.stream.frame_rate">24</property>
  <property name="meta.media.0.stream.sample_aspect_ratio">1</property>
  <property name="meta.media.0.codec.width">1920</property>
  <property name="meta.media.0.codec.height">818</property>
  <property name="meta.media.0.codec.rotate">0</property>
  <property name="meta.media.0.codec.frame_rate">24</property>
  <property name="meta.media.0.codec.pix_fmt">yuv420p</property>
  <property name="meta.media.0.codec.sample_aspect_ratio">0</property>
  <property name="meta.media.0.codec.colorspace">709</property>
  <property name="meta.media.0.codec.name">h264</property>
  <property name="meta.media.0.codec.long_name">H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10</property>
  <property name="meta.media.0.codec.bit_rate">0</property>
  <property name="meta.attr.0.stream.language.markup">eng</property>
  <property name="meta.media.1.stream.type">audio</property>
  <property name="meta.media.1.codec.sample_fmt">fltp</property>
  <property name="meta.media.1.codec.sample_rate">48000</property>
  <property name="meta.media.1.codec.channels">6</property>
  <property name="meta.media.1.codec.name">ac3</property>
  <property name="meta.media.1.codec.long_name">ATSC A/52A (AC-3)</property>
  <property name="meta.media.1.codec.bit_rate">640000</property>
  <property name="meta.attr.1.stream.language.markup">eng</property>
  <property name="meta.attr.1.stream.title.markup">AC3 5.1 @ 640 Kbps</property>
  <property name="meta.media.2.codec.name">srt</property>
  <property name="meta.media.2.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.2.codec.bit_rate">0</property>
  <property name="meta.attr.2.stream.language.markup">ger</property>
  <property name="meta.media.3.codec.name">srt</property>
  <property name="meta.media.3.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.3.codec.bit_rate">0</property>
  <property name="meta.attr.3.stream.language.markup">eng</property>
  <property name="meta.media.4.codec.name">srt</property>
  <property name="meta.media.4.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.4.codec.bit_rate">0</property>
  <property name="meta.attr.4.stream.language.markup">spa</property>
  <property name="meta.media.5.codec.name">srt</property>
  <property name="meta.media.5.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.5.codec.bit_rate">0</property>
  <property name="meta.attr.5.stream.language.markup">fre</property>
  <property name="meta.media.6.codec.name">srt</property>
  <property name="meta.media.6.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.6.codec.bit_rate">0</property>
  <property name="meta.attr.6.stream.language.markup">ita</property>
  <property name="meta.media.7.codec.name">srt</property>
  <property name="meta.media.7.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.7.codec.bit_rate">0</property>
  <property name="meta.attr.7.stream.language.markup">dut</property>
  <property name="meta.media.8.codec.name">srt</property>
  <property name="meta.media.8.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.8.codec.bit_rate">0</property>
  <property name="meta.attr.8.stream.language.markup">pol</property>
  <property name="meta.media.9.codec.name">srt</property>
  <property name="meta.media.9.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.9.codec.bit_rate">0</property>
  <property name="meta.attr.9.stream.language.markup">por</property>
  <property name="meta.media.10.codec.name">srt</property>
  <property name="meta.media.10.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.10.codec.bit_rate">0</property>
  <property name="meta.attr.10.stream.language.markup">rus</property>
  <property name="meta.media.11.codec.name">srt</property>
  <property name="meta.media.11.codec.long_name">SubRip subtitle</property>
  <property name="meta.media.11.codec.bit_rate">0</property>
  <property name="meta.attr.11.stream.language.markup">vie</property>
  <property name="meta.attr.encoder.markup">libebml v1.0.0 + libmatroska v1.0.0</property>
  <property name="meta.attr.creation_time.markup">2011-04-25T12:57:46.000000Z</property>
  <property name="meta.media.sample_aspect_num">1</property>
  <property name="meta.media.sample_aspect_den">1</property>
  <property name="meta.media.frame_rate_num">24</property>
  <property name="meta.media.frame_rate_den">1</property>
  <property name="meta.media.colorspace">709</property>
  <property name="meta.media.color_trc">2</property>
  <property name="meta.media.width">1920</property>
  <property name="meta.media.height">818</property>
  <property name="meta.media.top_field_first">0</property>
  <property name="meta.media.progressive">1</property>
 </producer>
 <playlist id="playlist4">
  <property name="kdenlive:track_name">Video 2</property>
  <entry out="1887" producer="1_playlist4" in="0"/>
 </playlist>
 <playlist id="playlist5">
  <property name="kdenlive:track_name">Video 3</property>
 </playlist>
 <tractor id="maintractor" title="Anonymous Submission" global_feed="1" out="1888" in="0">
  <track producer="black_track"/>
  <track producer="playlist1" hide="video"/>
  <track producer="playlist2" hide="video"/>
  <track producer="playlist3"/>
  <track producer="playlist4"/>
  <track producer="playlist5"/>
  <transition id="transition0">
   <property name="a_track">0</property>
   <property name="b_track">1</property>
   <property name="mlt_service">mix</property>
   <property name="always_active">1</property>
   <property name="sum">1</property>
   <property name="internal_added">237</property>
  </transition>
  <transition id="transition1">
   <property name="a_track">0</property>
   <property name="b_track">2</property>
   <property name="mlt_service">mix</property>
   <property name="always_active">1</property>
   <property name="sum">1</property>
   <property name="internal_added">237</property>
  </transition>
  <transition id="transition2">
   <property name="a_track">0</property>
   <property name="b_track">3</property>
   <property name="mlt_service">mix</property>
   <property name="always_active">1</property>
   <property name="sum">1</property>
   <property name="internal_added">237</property>
  </transition>
  <transition id="transition3">
   <property name="a_track">0</property>
   <property name="b_track">3</property>
   <property name="version">0.9</property>
   <property name="mlt_service">frei0r.cairoblend</property>
   <property name="internal_added">237</property>
  </transition>
  <transition id="transition4">
   <property name="a_track">0</property>
   <property name="b_track">4</property>
   <property name="mlt_service">mix</property>
   <property name="always_active">1</property>
   <property name="sum">1</property>
   <property name="internal_added">237</property>
  </transition>
  <transition id="transition5">
   <property name="a_track">0</property>
   <property name="b_track">4</property>
   <property name="version">0.9</property>
   <property name="mlt_service">frei0r.cairoblend</property>
   <property name="internal_added">237</property>
  </transition>
  <transition id="transition6">
   <property name="a_track">0</property>
   <property name="b_track">5</property>
   <property name="mlt_service">mix</property>
   <property name="always_active">1</property>
   <property name="sum">1</property>
   <property name="internal_added">237</property>
  </transition>
  <transition id="transition7">
   <property name="a_track">0</property>
   <property name="b_track">5</property>
   <property name="version">0.9</property>
   <property name="mlt_service">frei0r.cairoblend</property>
   <property name="internal_added">237</property>
  </transition>
 </tractor>
</mlt>