#2526: ffmpeg on windows crashes when using Avisynth 2.5.8
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Reporter: Zarxrax | Owner:
Type: defect | Status: open
Priority: important | Component:
Version: unspecified | undetermined
Keywords: regression | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Comment (by Trigunflame):
Replying to [comment:8 qyot27]:
> I found out something new during some testing just now. The issue with
2.5.8 is very specifically isolated to the loading of '''video''' streams.
If the script is loading audio only, then it doesn't cause 2.5.8 to crash
and FFmpeg can deal with it correctly.
>
> As was noted in the thread Zarx linked to, but curiously never got
brought up here (I'm partially to blame, I take responsibility for failing
to mention it also), the Version() function works with 2.5.8 and FFmpeg
doesn't have an issue with it. It's when external files - and due to the
new information, it's actually external '''video''' - are loaded that
problems start.
>
> To illustrate, scripts like the following:
> >Version()
> works with 2.5.8
> >AVISource("test.avi")
> fails with 2.5.8
> >AVISource("test.avi",audio=false)
> fails with 2.5.8
> >AVISource("test.avi").KillVideo()
> works with 2.5.8
> >WAVSource("test.wav")
> works with 2.5.8
> >FFAudioSource("test.mp4")
> works with 2.5.8
>
> and so on. With any of the arbitrary source filters, so long as the
only thing that's received by FFmpeg is audio, there's no problem. But
the instant that video is served through the script, there's the segfault
that this ticket centers around. This applies to audio-only files opened
with the script, or video+audio files, in which the latter case only works
if the video stream is disabled (or just simply ignored) within the
script, since if that happens it won't pass the video stream to FFmpeg and
the segfault will then be averted.
Wanted to mention that I have this issue as well on Win 7 x64.
Though, not specific to just FFMPEG, the freeze happens with MPC-
HC/VirtualDub as well in combination with AVISynth (2.5.x, 2.6.x, 2.6.x
MT) under the following conditions:
1) using AVISource (DirectshowSource seems to work fine)
2) loading a file with both video & audio streams. video only works just
fine.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2526#comment:13>
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