Segmentation fault when running examples/save_videos.rb #46
Comments
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@fapdash According to the official website, the following dependent libraries are required to build GR. https://gr-framework.org/building.html The libraries related to video output are depends_on "cmake" => :build
depends_on "cairo"
depends_on "glfw"
depends_on "libtiff"
depends_on "qhull"
depends_on "qt@5"
depends_on "zeromq"I guess Linux can't output video for the same reason... |
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Parhaps, you may be able to output video by simply installing the following dependent libraries. Libraries that may be related to video output are: sudo apt install -y libavcodec-dev \
libavdevice-dev \
libavformat-dev \
libavutil-dev |
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What is your distribution? |
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I'm on Ubuntu 20.04 as well. The same error still happens after installing the packages mentioned in #46 (comment). |
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What about libavdevice-dev? |
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Mh, that's also already installed: |
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I confirmed that the same error occurs when I set GKS_WSTYPE=100. |
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There are 2 problems:
diff --git a/lib/gks/plugin/vc.c b/lib/gks/plugin/vc.c
index 6391d651..ccf76cf0 100644
--- a/lib/gks/plugin/vc.c
+++ b/lib/gks/plugin/vc.c
@@ -270,7 +270,10 @@ void vc_movie_finish(movie_t movie)
if (movie->fmt_ctx && movie->cdc_ctx)
{
- av_write_trailer(movie->fmt_ctx);
+ if (movie->fmt_ctx->pb)
+ {
+ av_write_trailer(movie->fmt_ctx);
+ }
avcodec_close(movie->cdc_ctx);
if (!(movie->out_fmt->flags & AVFMT_NOFILE))For example, It can be happen by specifying wrong video size (
diff --git a/examples/save_videos.rb b/examples/save_videos.rb
index d17dbc1..68bf6a3 100644
--- a/examples/save_videos.rb
+++ b/examples/save_videos.rb
@@ -21,6 +21,9 @@ epoch.times do |i|
y << i**2 * Math.cos(i * Math::PI / 10.0) / 100.0
end
+# configure video size
+ENV['GKS_VIDEO_OPTS'] = '360x240@25@2x'
+
# start
GR.beginprint('savefig/video.mov')
@@ -32,9 +35,6 @@ end
# stop
GR.endprint
-# configure video size
-ENV['GKS_VIDEO_OPTS'] = '360x240@25@2x'
-
# You can use block
GR.beginprint('savefig/video.mp4') do
epoch.times do |j|If it's not specified, width and height ( It may set invalid width and/or height (not mod 4). Could you report 1. to GR? |
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@kou |
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Oh, sorry. It's abbreviation of "modulo 4": |
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x264 that is used by ffmpeg requires "mod 4" in this case: https://code.videolan.org/videolan/x264/-/blob/master/encoder/encoder.c#L529 |
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Thank you. |
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Reported to sciapp/gr. |
I understand that the README says that video might not be supported by the versions provided by package managers but a more helpful error message in those cases would be nice.
I followed the instructions to install
libgrm-devthrough apt:And then tried to run the
save_videos.rbexample:The text was updated successfully, but these errors were encountered: