Set NextPVR to auto transcode to hevc instead of h264

[Jean0987654321]

I know it's been a year @sub, but any updates on this?

Sorry, I've intentionally not done anything on this front.

For the most part the transcoding functionality in NextPVR is about getting content into a format that can be easily consumed by web clients. Unfortunately HEVC support is still not universal in web browsers, so I've just stuck with H264 at this stage (which is universally available).

I can see the rationale even if I disagree. It's not a deal breaker for me since I can just use Fileflows or a Postprocessing script to handle that

Cheers

[frutiloop]

I've also been curious about HEVC encoding for low bandwidth streaming to my cell phone.  I started by extracting from the nrecord.log file what the current ffmpeg parameters are which are being used for transcoding using an NVIDIA GPU.  These parameters are as follows:

-y [ANALYZE_DURATION] [SEEK] -i [SOURCE] -map_metadata -1 -threads 0 -ignore_unknown -map 0:v:0? -map 0:a:[AUDIO_STREAM] -map -0:s -codec:v:0 h264_nvenc [DEINTERLACING] -look_ahead 0 -pix_fmt nv12 -b:v [BITRATE] -maxrate [BITRATE] -bufsize [BUFSIZE] -vsync vfr -profile:v high -level 41  -s [RESOLUTION] [SUBTITLES] -flags -global_header -sc_threshold 0 -codec:a:0 [AUDIO_CODEC] -strict experimental -ac [AUDIO_CHANNELS] -ab [AUDIO_BITRATE] -af "adelay=1,aresample=async=1" -hls_time [SEGMENT_DURATION] -start_number 0 -hls_list_size [SEGMENT_COUNT] -y [TARGET]

The modifications to get it to transcode to HEVC are as follows:
Change "-codec:v:0 h264_nvenc"  ..TO..  "-codec:v:0 hevc_nvenc"
Change "-profile:v high -level 41"  ..TO..  "-profile:v main -level 4.1"
Add "-g 75" so the stream doesn't take 10 or more seconds to start.

In config.xml change
<TranscodeHLS>default</TranscodeHLS>

..TO..

<TranscodeHLS>-y [ANALYZE_DURATION] [SEEK] -i [SOURCE] -map_metadata -1 -threads 0 -ignore_unknown -map 0:v:0? -map 0:a:[AUDIO_STREAM] -map -0:s -codec:v:0 hevc_nvenc [DEINTERLACING] -g 75 -preset fast -look_ahead 0 -pix_fmt nv12 -b:v [BITRATE] -maxrate [BITRATE] -bufsize [BUFSIZE] -vsync vfr -profile:v main -level 4.1  -s [RESOLUTION] [SUBTITLES] -flags -global_header -sc_threshold 0 -codec:a:0 [AUDIO_CODEC] -strict experimental -ac [AUDIO_CHANNELS] -ab [AUDIO_BITRATE] -af "adelay=1,aresample=async=1" -hls_time [SEGMENT_DURATION] -start_number 0 -hls_list_size [SEGMENT_COUNT] -y [TARGET]</TranscodeHLS>

This change seems to work with the android app but not through any of the browsers I've tried. 
Using the android app, it is able to successfully stream transcoded recordings but had trouble streaming transcoded live TV.  With live TV, the TV tuner sometimes shuts down as it is attempting to stream.

Any suggestions on other ffmpeg parameters that may be adjusted or added to optimize the above?

[mvallevand]

I think the only browser that support hevc is Safari which is way h264 is standard.