On Fri, Mar 26, 2010 at 1:04 AM, Bobby Bingham <[email protected]> wrote: > On Fri, 26 Mar 2010 00:14:12 -0400 > Brandon Mintern <[email protected]> wrote: > >> On Thu, Mar 25, 2010 at 9:25 PM, Stefano Sabatini >> <[email protected]> wrote: >> > On date Thursday 2010-03-25 20:15:27 -0400, Brandon Mintern encoded: >> >> I am trying to overlay a transparent PNG (using alpha blending) of size >> >> 800x600 >> >> on an 11-second wmv file of size 800x600. In doing so, I get a >> >> Segmentation >> >> Fault immediately after the "Press [q] to stop encoding" message comes up. >> >> >> >> I already filed a bug at https://roundup.ffmpeg.org/issue1841 but >> >> cehoyos (the only responder thus far) said, "Imo, problems with a >> >> patch from the soc repository should be reported to the ffmpeg-soc >> >> mailing list." >> >> >> >> I'll provide here all of the information that I have provided so far >> >> in my bug report. >> >> >> >> The command I executed: >> >> >> >> ffmpeg -y -i intro-base.wmv -vfilters "movie=0:png:title-overlay.png >> >> [title]; >> >> [in][title] overlay=0:0:1 [out]" -vcodec wmv2 intro-title.wmv >> >> >> >> I have tried it both with and without the "[out]", with no change. When I >> >> omit >> >> all -vfilters stuff, the command works fine, so I'm quite sure the >> >> segfault is >> >> happening as a result of the libavfilter operations. >> >> >> >> My libavfilter info: >> >> >> >> $ svn info libavfilter >> >> Path: libavfilter >> >> URL: svn://svn.ffmpeg.org/soc/libavfilter >> >> Repository Root: svn://svn.ffmpeg.org/soc >> >> Repository UUID: 66570020-b32e-0410-962d-e44e8f9afd43 >> >> Revision: 5717 >> >> Node Kind: directory >> >> Schedule: normal >> >> Last Changed Author: stefano >> >> Last Changed Rev: 5717 >> >> Last Changed Date: 2010-03-24 19:25:00 -0400 (Wed, 24 Mar 2010) >> >> >> >> To build ffmpeg with libavfilter, I followed this process: >> >> http://ubuntuforums.org/showthread.php?t=1438052 (skip down to "Updating >> >> to >> >> latest..." for a quick look at how I'm doing it). I wrote that guide >> >> yesterday; >> >> it's quite possible I'm making a mistake in the build process. >> > [...] >> >> If there's anything else I can provide to help this along, I'd be happy >> >> to do >> >> so. I can upload the 2 sample files somewhere if that will be of >> >> assistance. >> > >> > Can you reproduce the same crash also with ffplay -vfilters "..." (I >> > cannot). Did you tried with other files or the crash only happens with >> > that particular file? >> > >> > In the last case yes, uploading the files somewhere may be of help. >> > >> > Regards. >> > _______________________________________________ >> > FFmpeg-soc mailing list >> > [email protected] >> > https://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-soc >> > >> >> Here's what ffplay gives me: >> >> $ ffplay -vfilters "movie=0:png:title-overlay.png [title]; [in][title] >> overlay=0:0:1" intro-base.wmv >> FFplay version SVN-r22626, Copyright (c) 2003-2010 the FFmpeg developers >> built on Mar 25 2010 02:46:11 with gcc 4.4.1 >> configuration: --enable-gpl --enable-version3 --enable-nonfree >> --enable-postproc --enable-pthreads --enable-libfaac --enable-libfaad >> --enable-libmp3lame --enable-libopencore-amrnb >> --enable-libopencore-amrwb --enable-libx264 --enable-libxvid >> --enable-x11grab --enable-avfilter --enable-avfilter-lavf >> --enable-debug >> libavutil 50.12. 0 / 50.12. 0 >> libavcodec 52.59. 0 / 52.59. 0 >> libavformat 52.56. 1 / 52.56. 1 >> libavdevice 52. 2. 0 / 52. 2. 0 >> libavfilter 1.18. 0 / 1.18. 0 >> libswscale 0.10. 0 / 0.10. 0 >> libpostproc 51. 2. 0 / 51. 2. 0 >> [wmv3 @ 0xa3f9150]Extra data: 8 bits left, value: 0 >> Input #0, asf, from 'intro-base.wmv': >> Metadata: >> title : GS-IntroV2 >> author : >> copyright : >> comment : >> WMFSDKVersion : 11.0.5721.5145 >> WMFSDKNeeded : 0.0.0.0000 >> IsVBR : 1 >> VBR Peak : 240 >> Buffer Average : 716 >> Duration: 00:00:11.33, start: 5.000000, bitrate: 409 kb/s >> Stream #0.0(eng): Audio: wmav2, 44100 Hz, 1 channels, s16, 48 kb/s >> Stream #0.1(eng): Video: wmv3, yuv420p, 800x600, 343 kb/s, 15 tbr, >> 1k tbn, 1k tbc >> [wmv3 @ 0xa3f9150]Extra data: 8 bits left, value: 0 >> [overlay @ 0xa538810]auto-inserting filter 'auto-inserted scaler 0' >> between the filter 'Parsed filter 0' and the filter 'Parsed filter 1' >> [scale @ 0xa53b9a0]w:800 h:600 fmt:yuva420p >> 16.33 A-V:-1269576481.385 s:0.0 aq= 0KB vq= 4657KB sq= 0B f=0/0 >> >> It just seems to run indefinitely without ever playing anything. The >> bottom line is displaying what it showed when I suspended it after it >> ran for about 10 minutes or so. The number after A-V continues to >> constantly grow (get more negative?) and vq constantly grows as well. >> >> The files (title-overlay.png and intro-base.wmv) are now hosted at >> http://bmintern.homeunix.com/~brandon/samples/ >> > > An immediate solution to your problem is to resave the PNG image with 8 > bits per color channel instead of 16. It looks like our PNG decoder > doesn't support 16 bits per channel. This means the movie filter > doesn't output a single frame, so the overlay filter doesn't either, > and ffmpeg doesn't handle it gracefully. > > I won't have time to dig into it in more depth until next week > sometime. Looks like this will hold up me applying the ffplay DR patch > as well, as this works in ffplay after converting to 8 bits/channel, > but not with that patch. Valgrind reports a bunch of accesses by MMX > code in the vc1 decoder to memory within 8 bytes or so after the end of > space allocated for a frame, so I'm guessing it has to with insufficient > linesize alignment in the allocated frame. > > -- > Bobby Bingham > このメールは再利用されたバイトでできている。 > _______________________________________________ > FFmpeg-soc mailing list > [email protected] > https://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-soc
Thanks a lot, I really appreciate you guys looking into this for me. I'm not sure why ImageMagick's default was to save a black/gray image as 16-bit PNG. I'm going to take those files down now. Brandon _______________________________________________ FFmpeg-soc mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-soc
