Preset with codec h264_nvenc/VBR used to work, now produces only audio, no video

[GreyFerret]

Hello.

I’m using latest Shotcut 19.07.15, latest NVIDIA Drivers version 436.10, Win 10.

About 4 months ago, I’ve found my perfect Preset for Youtube videos. It was working great for some time, but around 2-3 weeks ago, the very same preset started to produce only audio, ignoring video track at all. Changing codec to libx264 does the trick, but I want to get to the bottom of it and find out, why my preset suddenly stopped working. I’ve read Google and this forum about similar problems, but none of the info I’ve found was helpful.

I’m attaching screenshot of my preset. The only filter that I’m using for this project is audio “Gain/Volume”, applied to the entire Audio Track. Video for this project was encoded by Shotcut itself, “Good/Medium” option and produced by NVIDIA Expirience Instant Replay feature.

Any ideas?

[GreyFerret]

Bump.

[shotcut]

Turn on hardware encoder, and try export again. After the job is started a few %, right-click it and choose View Log… The early part of the log might have some messages that reveal the problem. You can save it and upload it here as well.

[GreyFerret]

Sorry for the late reply! Your tip was very helpful.

Here is my log.

plugin_mgr_get_object_file_plugins: error opening shared object file 'D:\Programs\Shotcut\lib\ladspa/AUTHORS': "D:\Programs\Shotcut\lib\ladspa\AUTHORS": The specified module could not be found.
plugin_mgr_get_object_file_plugins: error opening shared object file 'D:\Programs\Shotcut\lib\ladspa/COPYING': "D:\Programs\Shotcut\lib\ladspa\COPYING": The specified module could not be found.
plugin_mgr_get_object_file_plugins: error opening shared object file 'D:\Programs\Shotcut\lib\ladspa/readme.txt': "D:\Programs\Shotcut\lib\ladspa\readme.txt":
[h264 @ 00000000054d4f00] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 00000000054c4e80] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 00000000054cc6c0] Reinit context to 1920x1088, pix_fmt: yuv420p
[producer avformat] audio: total_streams 2 max_stream 2 total_channels 4 max_channels 2
[AVIOContext @ 000000000540a6c0] Statistics: 2504445 bytes read, 2 seeks
[AVIOContext @ 000000000978ee00] Statistics: 2504445 bytes read, 2 seeks
[AVIOContext @ 0000000004aece80] Statistics: 2504445 bytes read, 2 seeks
[h264 @ 00000000054f8180] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 00000000054f6ac0] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 00000000054d80c0] Reinit context to 1920x1088, pix_fmt: yuv420p
[producer avformat] audio: total_streams 2 max_stream 2 total_channels 4 max_channels 2
[AVIOContext @ 00000000054c3c80] Statistics: 2504445 bytes read, 2 seeks
[AVIOContext @ 0000000009ccae00] Statistics: 2504445 bytes read, 2 seeks
[AVIOContext @ 0000000004aeca80] Statistics: 2504445 bytes read, 2 seeks
[h264 @ 00000000054f8640] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 00000000054f5400] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 000000000979ac40] Reinit context to 1920x1088, pix_fmt: yuv420p
[producer avformat] audio: total_streams 2 max_stream 2 total_channels 4 max_channels 2
[AVIOContext @ 00000000054c3c80] Statistics: 2504445 bytes read, 2 seeks
[AVIOContext @ 00000000097aeec0] Statistics: 2504445 bytes read, 2 seeks
[AVIOContext @ 0000000004aeca80] Statistics: 2504445 bytes read, 2 seeks
[h264_nvenc @ 00000000054f5d00] Loaded Nvenc version 9.0
[h264_nvenc @ 00000000054f5d00] Nvenc initialized successfully
[h264_nvenc @ 00000000054f5d00] 1 CUDA capable devices found
[h264_nvenc @ 00000000054f5d00] [ GPU #0 - < GeForce RTX 2080 Ti > has Compute SM 7.5 ]
[h264_nvenc @ 00000000054f5d00] OpenEncodeSessionEx failed: out of memory (10)
[h264_nvenc @ 00000000054f5d00] No NVENC capable devices found
[h264_nvenc @ 00000000054f5d00] Nvenc unloaded
[h264 @ 00000000054f61c0] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 00000000054f7400] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 0000000005544c40] Reinit context to 1920x1088, pix_fmt: yuv420p
[producer avformat] audio: total_streams 2 max_stream 2 total_channels 4 max_channels 2
[AVIOContext @ 00000000054c3c80] Statistics: 2504445 bytes read, 2 seeks
[mp3 @ 000000000b007040] Skipping 0 bytes of junk at 1003.
[mp3 @ 000000000a0a5980] Skipping 0 bytes of junk at 1003.
[producer avformat] audio: total_streams 1 max_stream 0 total_channels 2 max_channels 2
[AVIOContext @ 00000000093b0500] Statistics: 98304 bytes read, 1 seeks
[filter swresample] 2(stereo) f32le 48000Hz -> 6(5.1) f32le 96000Hz
[producer avformat] D:/Videos/Shotcut/Close_Ending/Apex Legends 2019.mp4
checking VFR: pkt.duration 256
[filter swresample] 2(stereo) f32le 48000Hz -> 6(5.1) f32le 96000Hz
[h264 @ 00000000055470c0] Reinit context to 1920x1088, pix_fmt: yuv420p
[mp4 @ 00000000054c7e40] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
[mp4 @ 00000000054c7e40] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
[h264 @ 00000000055470c0] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 00000000055470c0] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 00000000055470c0] Reinit context to 1920x1088, pix_fmt: yuv420p

The important lines are the following:

[h264_nvenc @ 00000000054f5d00] Loaded Nvenc version 9.0
[h264_nvenc @ 00000000054f5d00] Nvenc initialized successfully
[h264_nvenc @ 00000000054f5d00] 1 CUDA capable devices found
[h264_nvenc @ 00000000054f5d00] [ GPU #0 - < GeForce RTX 2080 Ti > has Compute SM 7.5 ]
[h264_nvenc @ 00000000054f5d00] OpenEncodeSessionEx failed: out of memory (10)
[h264_nvenc @ 00000000054f5d00] No NVENC capable devices found
[h264_nvenc @ 00000000054f5d00] Nvenc unloaded

And as I found out, for some reason or another, you need to disable NVIDIA Expirience Instant Replay before starting encoding the video. It seems to block access to NVENC device for the Shotcut’s encoding.

With that trick, encoding would work fine, as it did before.

[shotcut]

@GreyFerret

you need to disable NVIDIA Expirience Instant Replay

Thanks for tracking that down to help others solve this problem.