[transcode-users] rc buffer underflow with ffmpeg

["Chris McBride" <chrismcbride555@xxxxxxxxxxx>]

I was trying to use ffmpeg (instead of mpeg2enc) to encode some clips of 
stuff I captured & have been getting rc buffer underflow message(s).  When 
encoding the same clip with mpeg2enc I do not get any errors but it is 
slowwwww......

transcode --export_asr 2 -w 7000 -i movie.avi -y ffmpeg,mp2enc -F mpeg2video 
-M 2 --print_status 20 -F '8,-B 348 -d -z t -n n' --encode_fields t 
--a52_drc_off -x mplayer="-contrast -10 -vf hqdn3d" -x mplayer -K -a 0 -H 10 
--export_prof dvd-ntsc -j -12,-4,-12,-4 --pre_clip 12,4,12,4 -E 48000,16,2 
-b 224 -m audio-ffmpeg -o video-ffmpeg -c 5000-7000

--output--
tc_memcpy: using mmxext for memcpy
skipping frames [000000-004980],  33.51 fps, EMT: 0:02:46, ( 0| 0| 0)
[mpeg2video @ 0x558150]rc buffer underflow
encoding frame [6980],  10.93 fps, 99.0%, ETA: 0:00:01, ( 0| 0| 0)
-----------

I have tried some different options in ffmpeg.cfg - here is my basic file:

[mpeg2video]
vhq = 1
vqsquish = 0
vqcomp = 0.7
vqblur = 0.3
vrc_minrate=0
vrc_maxrate=9800
# vrc_buf_size=1792 # suggestion online
vrc_buf_size=1835 # DVD setting in man page

Any suggestions  would be greatly appreciated.

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