Re: "package video is empty"

[Andreas Weber]

Am 02.08.2013 21:13, schrieb Cameron MacArthur:
> I am needing to use octave to create a .avi file, but it doesn't have
> the avifile command.  I downloaded the video package from Octave Forge
> (which has the command).  When i navigate to it and type "pkg install
> video-1.0.2.tar.gz" the prompt returns:
>  
> warning: package video is empty

Dear Cameron,
the 1.0.2 package was released 2009 and I doubt it will compile on any
recent distribution. You may try the hg repo:

http://sourceforge.net/p/octave/video/ci/default/tree/

I tried it today on debian stable with
ffmpeg and libavformat-dev 8:1.0.7-dmo2

Basically you have to install ffmpeg, libavformat-dev, libswscale-dev,
liboctave-dev (for mkoctfile) and then

hg clone http://hg.code.sf.net/p/octave/video octave-video
cd  octave-video/src
./bootstrap
./configure
apply my patch for ffmpeg>0.8:

diff -r 02f3aacc2f71 src/AVHandler.cc
--- a/src/AVHandler.cc  Mon Jun 17 23:26:31 2013 +0100
+++ b/src/AVHandler.cc  Mon Aug 05 10:54:39 2013 +0200
@@ -120,19 +120,12 @@
         if (add_video_stream() != 0) return -1;
     }

-    /* av_set_parameters is mandatory */
-    // FIXME: deprecated, but there's no replacement yet
-    if (av_set_parameters(av_output, NULL) < 0) {
-        (*out) << "AVHandler: Error setting output format parameters"
<< std::endl;
-        return -1;
-    }
-
     snprintf(av_output->filename, sizeof(av_output->filename), "%s",
filename.c_str());
 // FIXME:    snprintf(av_output->title, sizeof(av_output->title), "%s",
title.c_str());
 // FIXME:    snprintf(av_output->author, sizeof(av_output->author),
"%s", author.c_str());
 // FIXME:    snprintf(av_output->comment, sizeof(av_output->comment),
"%s", comment.c_str());

-    if (avio_open(&av_output->pb, filename.c_str(), URL_WRONLY) < 0) {
+    if (avio_open(&av_output->pb, filename.c_str(), AVIO_FLAG_WRITE) < 0) {
         (*out) << "AVHandler: Could not open \"" << filename << "\" for
output" << std::endl;
         return -1;
     }
@@ -383,7 +376,7 @@
     AVCodec *codec;
     for (codec = av_codec_next(0); codec != NULL; codec =
av_codec_next(codec)) {
         if ((codec->type == AVMEDIA_TYPE_VIDEO) &&
-            (codec->encode)) {
+            (av_codec_is_encoder (codec))) {
             (*out) << codec->name << " ";
         }
     }

and then make. You may the run the tests in octave

octave:1> test avifile.cc
PASSES 1 out of 1 tests
octave:2> test aviread.cc
AVHandler: Error reading packet after timestamp 0
  ***** xtest
 fn = tmpnam;
 x = avifile(fn);
 I = ones(256,256);
 addframe(x, I);
 clear x
 #FIXME: This fails if there is only 1 frame
 I = aviread(fn, 1);
!!!!! known failure
aviread: cannot read frame 1
PASSES 2 out of 2 tests (1 expected failures)
octave:3> test addframe.cc
PASSES 1 out of 1 tests

HTH, Andy