> On Jun 8, 2016, at 12:30 PM, Michael Niedermayer <mich...@niedermayer.cc> > wrote: > > On Tue, Jun 07, 2016 at 08:06:35PM -0400, Dave Rice wrote: >> >>> On May 31, 2016, at 3:23 PM, Michael Niedermayer <mich...@niedermayer.cc> >>> wrote: >>> >>> adding demuxer and other logs should be easy >>> This forces single threaded decoding for simplicity >>> It also requires pthreads, this could be avoided either with >>> some lockless tricks or simply by assuming av_log would never be called from >>> another thread. >> >> I’ve been testing this patch, but currently the logging does not appear >> within the log node. For instance with a fuzzed mpeg2video in QuickTime when >> I run: >> >> ./ffprobe -i /Users/davidrice/fuzzed_mpeg2video.mov -show_log 1 -show_frames >> -of xml > [...] >> >> When the mpeg2video decoding log appears in sdterr, then the <logs> node is >> written but empty. During a frame when there is no logged message, there is >> no <logs> node. >> >> Also I’m uncertain what the value to use with -show_log means. I’m using >> -show_log 1 for now. Is this for verbosity? > > you need to set the log level in -show_log high enough so the messages > that you are interrested in are included
OK, the value just needs to be higher than I expected.
I created a test file with:
ffmpeg -f lavfi -i testsrc -bsf noise -t 1 -c:v mpeg2video fuzzed_mpeg2video.mov
I don't actually get log info until the -show_log value is up to 16. Then this
works:
ffprobe fuzzed_mpeg2video.mov -show_log 16 -show_frames -of xml
But it outputs invalid xml:
<logs>
<(null) key="context" value="mpeg2video"/>
level="16" category="6" <(null) key="message"
value="[mpeg2video @ 0x7fa4a3800000] skipped MB in I frame at 3 0
"/>
<(null) key="context" value="mpeg2video"/>
level="16" category="6" <(null) key="message"
value="[mpeg2video @ 0x7fa4a3800000] ac-tex damaged at 16 9
"/>
<(null) key="context" value="mpeg2video"/>
level="16" category="6" <(null) key="message"
value="[mpeg2video @ 0x7fa4a3800000] ac-tex damaged at 11 11
"/>
<(null) key="context" value="mpeg2video"/>
level="16" category="6" <(null) key="message"
value="[mpeg2video @ 0x7fa4a3800000] invalid mb type in I Frame at 9 13
"/>
<(null) key="context" value="mpeg2video"/>
level="16" category="6" <(null) key="message"
value="[mpeg2video @ 0x7fa4a3800000] Warning MVs not available
"/>
</logs>
The 'log' node is called '(null)' and the level and category attributes are
outside of a node.
> all messages are still printed to stderr too, maybe that is confusing
> but feels consistent behavior
I agree.
[...]
Dave Rice
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