[FFmpeg-user] buffer underflow (?)

Carl Zwanzig cpz at tuunq.com
Sat Sep 30 01:34:53 EEST 2023

On 9/29/2023 2:25 PM, Mark Filipak wrote:

> On Fri, Sep 29, 2023 at 12:59 PM Carl Zwanzig<cpz at tuunq.com>  wrote:
>> -bsf[:stream_specifier] bitstream_filters (output,per-stream)
>> :a will do the audio, :s for subtitles, etc
>> (that's in the doc)

> No, it's not in the doc. 

It surely is, that's where I quoted it from-
https://ffmpeg.org/ffmpeg-all.html#Advanced-options and about 300 lines down 
(or search for "-bsf"). It's around line 1760 of doc/ffmpeg.texi in the 
source tree. (You could also look at 

Those are documentation for ffmpeg, pretty much the reference set unless you 
read the source code.

> And the 'doc' are programmer documentations, not user documentation.
Where did you get -that- idea? (User doc has been a thing for at least 50 
years, I still have some of those books, and probably a lot longer.)

BTW, the text "underflow" only appears maybe 20 times in the copy of the 
source I have handy (I'm not going to update just for this).

Possibly the most relevant ones are-
libavformat/mpegenc.c:                       "buffer underflow st=%d bufi=%d 
libavcodec/ratecontrol.c:            av_log(s->avctx, AV_LOG_ERROR, "rc 
buffer underflow\n");

but we don't know _because_we_don't_have_the_console_output_.


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