Every second video file has no audio

Is this issue new? Does the Source Recorder write the audio file? Do they still exist in AviRecTGA?
I think the issue has always been there. The source recorder has always written a file. Nothing is ever left in the TGA folder afterwards. I am using 'snd_soundmixer Default_Mix' in the startmovie commands though, could it be that?. I'll do some tests with it off. EDIT: I removed all my startmovie commands and now it works perfectly:
The commands I used were: "host_timescale 0.001; r_cleardecals; snd_soundmixer Default_Mix; demo_resume; gameui_hide"
Ah alright, I guess it was probably host_timescale being very low.
I had doubted it was those commands because I took them from the lawena config, I'm sorry I didn't test it first.