<TranscodeExe> in config.xml ignored?

[aderlopas]

Hello,

I have set the below tags in config.xml:

<TranscodeExe>.\other\startffmpeg.cmd</TranscodeExe>

<TranscodeHLS>-y [SEEK] -hwaccel:v:0 d3d11va -hwaccel_device:v:0 0 -bsf:v h264_mp4toannexb -i [SOURCE] -omit_video_pes_length 1 -map_metadata -1 -threads 0 -ignore_unknown -map 0:v:0 -map 0:a:[AUDIO_STREAM] -map -0  -c:v h264_qsv -pix_fmt yuv420p -preset veryfast  -global_quality 25 -b:v [BITRATE] -maxrate [BITRATE] -bufsize [BUFSIZE] -fps_mode passthrough -profile:v high -level 4.0 -force_key_frames "expr:gte(t,n_forced*1)" -s [RESOLUTION] [SUBTITLES] -flags -global_header -sc_threshold 0 -codec:a:0 aac -strict experimental -ac 2 -ab 128000 -af "adelay=1,aresample=async=1" -hls_time [SEGMENT_DURATION] -start_number 0 -hls_list_size [SEGMENT_COUNT] -y [TARGET]</TranscodeHLS>   

Where startffmpeg.cmd is a script with the following command: 

start /b /high .\other\ffmpeg.exe

But I don't see this command line being used in the logs:

2024-09-01 23:08:07.685 [DEBUG][17] Executing: C:\Program Files\NextPVR\Other\ffmpeg.exe -y  -hwaccel:v:0 d3d11va -hwaccel_device:v:0 0 -bsf:v h264_mp4toannexb -i http://127.0.0.1:8866/live?channeloid=71...249157f851 -omit_video_pes_length 1 -map_metadata -1 -threads 0 -ignore_unknown -map 0:v:0 -map 0:a:0 -map -0  -c:v h264_qsv -pix_fmt yuv420p -preset veryfast  -global_quality 25 -b:v 4000000 -maxrate 4000000 -bufsize 8000000 -fps_mode passthrough -profile:v high -level 4.0 -force_key_frames "expr:gte(t,n_forced*1)" -s 1280x720 -c dvbsub -flags -global_header -sc_threshold 0 -codec:a:0 aac -strict experimental -ac 2 -ab 128000 -af "adelay=1,aresample=async=1" -hls_time 5 -start_number 0 -hls_list_size 243 -y "C:\Users\Public\NPVR-data\web\temp\ANT1-00b7218a0947418fa5113745e3427b31.m3u8"

is there something I am doing wrong?

Thanks and regards

[mvallevand]

What are you trying to do?

Martin

[sub]

That <TranscodeExe> setting is not used.

[aderlopas]

What are you trying to do?

Martin

Hi Martin,

I am trying to raise ffmpeg process priority

[mvallevand]

What are you trying to do?

Hi Martin,

I am trying to raise ffmpeg process priority

I thought so but if your system isn't busy that won't make much difference in producing data and may impact NextPVR's ability to deliver it.   There are two config.xml settings for NextPVR that would be better to experiment with.

<UseHigherPriority>false</UseHigherPriority>
<HigherPriorityLevel>AboveNormal</HigherPriorityLevel>

However Windows doesn't do that bad a job with resources and for a slow PC that is not able to keep up that is already using GPU I would focus on a simpler command line and lower some quality rather than impacting the system.   From the command line also try and see if using different values here -threads 0 since your system might use threads differently and a theoretical optimal may not be best.  Turning off things like antivirus are your best bet.

If bandwidth and mobile use is your real concern (seems to be since you could be using a direct play client) 4MB bit rate is pretty high.

Martin

[aderlopas]

What are you trying to do?

Hi Martin,

I am trying to raise ffmpeg process priority

I thought so but if your system isn't busy that won't make much difference in producing data and may impact NextPVR's ability to deliver it.   There are two config.xml settings for NextPVR that would be better to experiment with.

<UseHigherPriority>false</UseHigherPriority>
<HigherPriorityLevel>AboveNormal</HigherPriorityLevel>

However Windows doesn't do that bad a job with resources and for a slow PC that is not able to keep up that is already using GPU I would focus on a simpler command line and lower some quality rather than impacting the system.   From the command line also try and see if using different values here -threads 0 since your system might use threads differently and a theoretical optimal may not be best.  Turning off things like antivirus are your best bet.

If bandwidth and mobile use is your real concern (seems to be since you could be using a direct play client) 4MB bit rate is pretty high.

Martin

Hi Martin, 

Thank you for your reply. 
The PC is a fairly enough to handle 2 DVB-T2 streams with some hw accelaration.
what I'm trying to avoid is random freezes that are done from time to time. 
Bandwidth in my LAN this PC has 300Mbit  ethernet and for Internet I have 10Mbit DSL upload until I manage to upgrade it.
This PC only runs Apache 2.0 and Nextpvr, Apache handling the security and being the reverse proxy to nextpvr. 
I hope it makes sense.
Right now the priority of ffmpeg is below normal, and streaming is affectred for example when I do remote RDS connection to the box.  I'll try and use the two settings you suggested to increase the priority and see what happens.

Kind regards

[aderlopas]

What are you trying to do?

Hi Martin,

I am trying to raise ffmpeg process priority

I thought so but if your system isn't busy that won't make much difference in producing data and may impact NextPVR's ability to deliver it.   There are two config.xml settings for NextPVR that would be better to experiment with.

<UseHigherPriority>false</UseHigherPriority>
<HigherPriorityLevel>AboveNormal</HigherPriorityLevel>

However Windows doesn't do that bad a job with resources and for a slow PC that is not able to keep up that is already using GPU I would focus on a simpler command line and lower some quality rather than impacting the system.   From the command line also try and see if using different values here -threads 0 since your system might use threads differently and a theoretical optimal may not be best.  Turning off things like antivirus are your best bet.

If bandwidth and mobile use is your real concern (seems to be since you could be using a direct play client) 4MB bit rate is pretty high.

Martin

Hi Martin, 

Thank you for your reply. 
The PC is a fairly enough to handle 2 DVB-T2 streams with some hw accelaration.
what I'm trying to avoid is random freezes that are done from time to time. 
Bandwidth in my LAN this PC has 300Mbit  ethernet and for Internet I have 10Mbit DSL upload until I manage to upgrade it.
This PC only runs Apache 2.0 and Nextpvr, Apache handling the security and being the reverse proxy to nextpvr. 
I hope it makes sense.
Right now the priority of ffmpeg is below normal, and streaming is affectred for example when I do remote RDS connection to the box.  I'll try and use the two settings you suggested to increase the priority and see what happens.

Kind regards

Which also seems not to be working as I checked after I changed the two settings as follows:

<UseHigherPriority>true</UseHigherPriority>
    <HigherPriorityLevel>AboveNormal</HigherPriorityLevel>

And the priority I see in task manager for the ffmpeg process is still BelowNormal (I restarted nextpvr service after making the change).

Kind regards

[mvallevand]

I know sub drops priority for ffmpeg for thumbnail and timing extraction perhaps that inadvertently was added for streaming.

I wouldn't use your settings with 10Mb upload. Maybe try and reduce RDP use to when you aren't streaming Live TV remotely.

Martin

[aderlopas]

I know sub drops priority for ffmpeg for thumbnail and timing extraction perhaps that inadvertently was added for streaming.

I wouldn't use your settings with 10Mb upload.  Maybe try and reduce RDP use to when you aren't streaming Live TV remotely.

Martin

Hi Martin, RDP I just brought up as an example. I am not using RDP that often only to administer the PC. 
The problem is that from time to time the streaming freezes shortly, either from the Android App or from Kodi.

[sub]

When you're using Kodi, it shouldn't be using using ffmpeg, except if thumbnails/timing is still on, but these are run at below normal priority to minimize any interference. So no need to try running ffmpeg at high priority.