Recording with ffmpeg: 24bit FLAC

[Drexel2k]

Hey!

I am currently preparing a 4k recording setup. I record a facecam beside the game video, so I set up a video width of 4920x2160 which isn't supprted by NVENC/h264. So I setup NVENC/HEVC (h265) recording with ffmpeg which works fine. I also took the chance to switch the audio recording to flac, and I want to record 24 bits depth FLAC, as the microphone supports 24bits, but OBS always records FLAC with 16 bits depth.

If I encode an audio on the command line to flac, I can set it with the paramter -sample_fmt s32 to 24 bits depth, but when I set this in the audio encoder settings, the log says: Failed to set sample_fmt=s32

I attached a screenshot with the settings, here is the log file: https://obsproject.com/logs/gJ0S9WuC2vBOYugJ

Any ideas?

Best regards
Matthias

 

[rockbottom]

I've been trying to figure it out myself.

Worst case, record PCM, then convert the PCM to FLAC & replace the PCM & mux it all with mkvmerge..

 

[Drexel2k]

Thank you for your commitment. It is not super important to be lossless for, I can still go with aac 320KBit/s which is nearly lossless for a stereo track. I think PCM then is a little bit overdone.

 

[rockbottom]

OK but if you're not going to use FLAC or PCM, I highly suggest that you get Core Audio installed on your system.
10:08:11.964: [CoreAudio encoder]: CoreAudio AAC encoder not installed on the system or couldn't be loaded

 

[Drexel2k]

Ah nice, thank you for the hint, I wasn't aware of this. Tested it today and works fine. :)

 

[DayGeckoArt]

I've recently switched to Mov files with PCM audio for compatibility with Premiere, but FLAC 24 bit would be great! It's so efficient and if a track has no sound, it has zero bitrate!