On Wed, Jul 20, 2016 at 03:59:39PM +0000, code bythepound wrote: > My app seems to hit the av_assert0(len >= s->orig_buffer_size) (line 535 in > my sources) in aviobuf.c::fill_buffer. FWIW I have registered a custom > AVIOContext that will consistently not fill the entire buffer when the read > callback is called. > > The outcome is that 'len' in fill_buffer is decremented with each call > until it is less than s->orig_buffer_size and will assert fail. It seems > that instead of the assertion failure, the method should be: > > if( len >= s->orig_buffer_size ) > len = s->orig_buffer_size > // otherwise, len is < than orig_buffer_size, but is sized correctly to > fill remainder of buffer. > > On the next iteration, the previous clause (dst == s->buffer) is executed > and the buffer is reset. After that, this block is never executed again. > > With the above fix in, my app seems to work fine. > > Since the fill_buffer code has been the same for many releases of ffmpeg, > I'm wondering how I could be the first to notice it, and if there is > something else I could be doing wrong to cause this?
is there some easy way to reproduce this ?
i tried
diff --git a/libavformat/file.c b/libavformat/file.c
index 264542a..529a975 100644
--- a/libavformat/file.c
+++ b/libavformat/file.c
@@ -108,6 +108,7 @@ static int file_read(URLContext *h, unsigned char *buf, int
size)
{
FileContext *c = h->priv_data;
int ret;
+ size = FFMIN(size, size/5 + 1);
size = FFMIN(size, c->blocksize);
ret = read(c->fd, buf, size);
if (ret == 0 && c->follow)
but it doesnt trigger the assert
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Modern terrorism, a quick summary: Need oil, start war with country that
has oil, kill hundread thousand in war. Let country fall into chaos,
be surprised about raise of fundamantalists. Drop more bombs, kill more
people, be surprised about them taking revenge and drop even more bombs
and strip your own citizens of their rights and freedoms. to be continued
signature.asc
Description: Digital signature
_______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
