Thanks!

If I use the parameters you mention below, rendering is stuck right at the beginning. The error message reads

[mp4 @ 0x7f526c000f00] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead. [mp4 @ 0x7f526c000f00] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead. [mp4 @ 0x7f526c000f00] Could not find tag for codec pcm_s16be in stream #1, codec not currently supported in container [consumer avformat] Could not write header '/home/jogchum/Videodata/Videocamera/Taalfilmkes/Waldreis/Wâldreis-3.mp4'

I tried to switch the codec to pcm_s16le, one that is mentioned in one of the mlt-6 consumer profiles, but that made no difference.

Btw, where can I get info about the parameter values? E.g., what does "g=12" mean?

Op 25-04-18 om 22:49 schreef Massimo Stella:
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You can try to do this by using this parameters:

f=mp4 vcodec=mpeg2video g=12 vb=35M acodec=pcm_s16be ar=48000

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