[FFmpeg-trac] #2846(undetermined:new): Two-pass libx264 -preset veryslow crashes on some MPEG-type inputs
FFmpeg
trac at avcodec.org
Fri Aug 23 09:59:53 CEST 2013
#2846: Two-pass libx264 -preset veryslow crashes on some MPEG-type inputs
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Reporter: | Owner:
francois.visagie@… | Status: new
Type: defect | Component:
Priority: normal | undetermined
Version: unspecified | Resolution:
Keywords: crash | Blocked By:
libx264 | Reproduced by developer: 0
Blocking: |
Analyzed by developer: 0 |
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Comment (by francois.visagie@…):
Replying to [comment:13 cehoyos]:
> It is needed at least for some inputs ... This is related to A/V-sync
... I am not sure if anything can be changed within FFmpeg.
I can understand how having muxers with potentially different capabilities
in the two passes may lead to problems - http://www.ffmpeg.org/ffmpeg-
all.html#Advanced-options:
> ‘-vsync parameter’
...
‘-1, auto’
Chooses between 1 and 2 depending on muxer capabilities. This is
the default method.
However,
Replying to [comment:1 francois.visagie@…]:
> In summary:
> With this input, ffmpeg crashes when:
>
> * content is demuxed from an MPEG-type format, and
> * 2-pass encoding is used, and
> * '-c:v libx264 -preset veryslow' is used
the fact remains that at least '-c:v libx264 -preset ultrafast' handles
this particular scenario correctly, while '-c:v libx264 -preset veryslow'
doesn't?
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2846#comment:15>
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