[FFmpeg-soc] why it is not possible to overlay with negative y position?

Oleksandr Bondar obondar at gmail.com
Mon Nov 16 23:48:21 CET 2009 

Hello,

Why it is not possible to use overlay filter with negative y
coordinates? It works when x is negative but not y.
How this can be fixed?

stack trace:
ffmpeg -i in3.flv -vfilters
"[in]setpts=PTS-STARTPTS,[T1]overlay=-20+13*atan(N/40):-20+14*atan(N)[out];movie=0:flv:in2.flv,scale=487:365,setpts=PTS-STARTPTS[T1]"
 out.avi
FFmpeg version SVN-r20390, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  built on Nov  3 2009 21:51:11 with gcc 4.4.1
  configuration: --enable-libmp3lame --enable-libvorbis --disable-mmx
--enable-shared --enable-nonfree --enable-libtheora
--enable-avfilter-lavf --enable-avfilter
  libavutil     50. 3. 0 / 50. 3. 0
  libavcodec    52.37. 1 / 52.37. 1
  libavformat   52.39. 2 / 52.39. 2
  libavdevice   52. 2. 0 / 52. 2. 0
  libavfilter    1. 6. 0 /  1. 6. 0
  libswscale     0. 7. 1 /  0. 7. 1

Seems stream 0 codec frame rate differs from container frame rate:
60.00 (60/1) -> 29.97 (30000/1001)
Input #0, flv, from 'in3.flv':
  Duration: 00:00:30.80, start: 0.000000, bitrate: 414 kb/s
    Stream #0.0: Video: h264, yuv420p, 480x360 [PAR 1:1 DAR 4:3], 414
kb/s, 29.97 tbr, 1k tbn, 60 tbc
    Stream #0.1: Audio: aac, 44100 Hz, stereo, s16
  Metadata
    duration        : 31
    starttime       : 0
    totalduration   : 31
    width           : 480
    height          : 360
    videodatarate   : 404
    audiodatarate   : 107
    totaldatarate   : 513
    framerate       : 30
    bytelength      : 2009597
    canseekontime   : true
    sourcedata      : B4A7D0AC6
    purl            :
    pmsg            :
File 'out.avi' already exists. Overwrite ? [y/N] y
x:-20 y:-20
Output #0, avi, to 'out.avi':
    Stream #0.0: Video: mpeg4, yuv420p, 480x360 [PAR 1:1 DAR 4:3],
q=2-31, 200 kb/s, 29.97 tbn, 29.97 tbc
    Stream #0.1: Audio: mp2, 44100 Hz, stereo, s16, 64 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press [q] to stop encoding
*** glibc detected *** ffmpeg: munmap_chunk(): invalid pointer:
0x00000000009e0190 ***
======= Backtrace: =========
/lib/libc.so.6[0x7fefb158ddd6]
/usr/local/lib/libavfilter.so.1(avfilter_default_free_video_buffer+0xc)[0x7fefb2f1bb3c]
/usr/local/lib/libavfilter.so.1(avfilter_unref_pic+0x1a)[0x7fefb2f1a91a]
ffmpeg[0x40893d]
ffmpeg[0x40d094]
ffmpeg[0x40ddb1]
/lib/libc.so.6(__libc_start_main+0xfd)[0x7fefb1536abd]
ffmpeg[0x404859]
======= Memory map: ========
00400000-00415000 r-xp 00000000 08:01 67199
  /usr/local/bin/ffmpeg
00614000-00616000 r--p 00014000 08:01 67199
  /usr/local/bin/ffmpeg
00616000-00617000 rw-p 00016000 08:01 67199
  /usr/local/bin/ffmpeg
00617000-0061c000 rw-p 00000000 00:00 0
006d2000-00a93000 rw-p 00000000 00:00 0                                  [heap]
7fefb03df000-7fefb03f5000 r-xp 00000000 08:01 839
  /lib/libgcc_s.so.1
7fefb03f5000-7fefb05f4000 ---p 00016000 08:01 839
  /lib/libgcc_s.so.1
7fefb05f4000-7fefb05f5000 r--p 00015000 08:01 839
  /lib/libgcc_s.so.1
7fefb05f5000-7fefb05f6000 rw-p 00016000 08:01 839
  /lib/libgcc_s.so.1
7fefb05f6000-7fefb0619000 r-xp 00000000 08:01 63982
  /usr/local/lib/libvorbis.so.0.4.0
7fefb0619000-7fefb0818000 ---p 00023000 08:01 63982
  /usr/local/lib/libvorbis.so.0.4.0
7fefb0818000-7fefb0819000 r--p 00022000 08:01 63982
  /usr/local/lib/libvorbis.so.0.4.0
7fefb0819000-7fefb0827000 rw-p 00023000 08:01 63982
  /usr/local/lib/libvorbis.so.0.4.0
7fefb0827000-7fefb0842000 r-xp 00000000 08:01 64005
  /usr/local/lib/libvorbisenc.so.2.0.3
7fefb0842000-7fefb0a41000 ---p 0001b000 08:01 64005
  /usr/local/lib/libvorbisenc.so.2.0.3
7fefb0a41000-7fefb0a42000 r--p 0001a000 08:01 64005
  /usr/local/lib/libvorbisenc.so.2.0.3
7fefb0a42000-7fefb0c01000 rw-p 0001b000 08:01 64005
  /usr/local/lib/libvorbisenc.so.2.0.3
7fefb0c01000-7fefb0c06000 r-xp 00000000 08:01 63728
  /usr/local/lib/libogg.so.0.5.3
7fefb0c06000-7fefb0e05000 ---p 00005000 08:01 63728
  /usr/local/lib/libogg.so.0.5.3
7fefb0e05000-7fefb0e06000 r--p 00004000 08:01 63728
  /usr/local/lib/libogg.so.0.5.3
7fefb0e06000-7fefb0e07000 rw-p 00005000 08:01 63728
  /usr/local/lib/libogg.so.0.5.3
7fefb0e07000-7fefb0e56000 r-xp 00000000 08:01 66128
  /usr/local/lib/libtheora.so.0.3.3
7fefb0e56000-7fefb1056000 ---p 0004f000 08:01 66128
  /usr/local/lib/libtheora.so.0.3.3
7fefb1056000-7fefb1057000 r--p 0004f000 08:01 66128
  /usr/local/lib/libtheora.so.0.3.3
7fefb1057000-7fefb1058000 rw-p 00050000 08:01 66128
  /usr/local/lib/libtheora.so.0.3.3
7fefb1058000-7fefb10cf000 r-xp 00000000 08:01 63677
  /usr/local/lib/libmp3lame.so.0.0.0
7fefb10cf000-7fefb12ce000 ---p 00077000 08:01 63677
  /usr/local/lib/libmp3lame.so.0.0.0
7fefb12ce000-7fefb12cf000 r--p 00076000 08:01 63677
  /usr/local/lib/libmp3lame.so.0.0.0
7fefb12cf000-7fefb12d0000 rw-p 00077000 08:01 63677
  /usr/local/lib/libmp3lame.so.0.0.0
7fefb12d0000-7fefb1301000 rw-p 00000000 00:00 0
7fefb1301000-7fefb1317000 r-xp 00000000 08:01 3918
  /lib/libz.so.1.2.3.3
7fefb1317000-7fefb1516000 ---p 00016000 08:01 3918
  /lib/libz.so.1.2.3.3
7fefb1516000-7fefb1517000 r--p 00015000 08:01 3918
  /lib/libz.so.1.2.3.3
7fefb1517000-7fefb1518000 rw-p 00016000 08:01 3918
  /lib/libz.so.1.2.3.3
7fefb1518000-7fefb167e000 r-xp 00000000 08:01 995
  /lib/libc-2.10.1.so
7fefb167e000-7fefb187d000 ---p 00166000 08:01 995
  /lib/libc-2.10.1.so
7fefb187d000-7fefb1881000 r--p 00165000 08:01 995
  /lib/libc-2.10.1.so
7fefb1881000-7fefb1882000 rw-p 00169000 08:01 995
  /lib/libc-2.10.1.so
7fefb1882000-7fefb1887000 rw-p 00000000 00:00 0
7fefb1887000-7fefb1909000 r-xp 00000000 08:01 999
  /lib/libm-2.10.1.so
7fefb1909000-7fefb1b09000 ---p 00082000 08:01 999
  /lib/libm-2.10.1.so
7fefb1b09000-7fefb1b0a000 r--p 00082000 08:01 999
  /lib/libm-2.10.1.so
7fefb1b0a000-7fefb1b0b000 rw-p 00083000 08:01 999
  /lib/libm-2.10.1.so
7fefb1b0b000-7fefb1b2a000 r-xp 00000000 08:01 67276
  /usr/local/lib/libswscale.so.0.7.1
7fefb1b2a000-7fefb1d2a000 ---p 0001f000 08:01 67276
  /usr/local/lib/libswscale.so.0.7.1
7fefb1d2a000-7fefb1d2b000 r--p 0001f000 08:01 67276
  /usr/local/lib/libswscale.so.0.7.1
7fefb1d2b000-7fefb1d2c000 rw-p 00020000 08:01 67276
  /usr/local/lib/libswscale.so.0.7.1
7fefb1d2c000-7fefb1d38000 r-xp 00000000 08:01 67278
  /usr/local/lib/libavutil.so.50.3.0
7fefb1d38000-7fefb1f37000 ---p 0000c000 08:01 67278
  /usr/local/lib/libavutil.so.50.3.0
7fefb1f37000-7fefb1f38000 r--p 0000b000 08:01 67278
  /usr/local/lib/libavutil.so.50.3.0
7fefb1f38000-7fefb1f39000 rw-p 0000c000 08:01 67278
  /usr/local/lib/libavutil.so.50.3.0
7fefb1f39000-7fefb1f3c000 rw-p 00000000 00:00 0
7fefb1f3c000-7fefb23f6000 r-xp 00000000 08:01 67280
  /usr/local/lib/libavcodec.so.52.37.1
7fefb23f6000-7fefb25f6000 ---p 004ba000 08:01 67280
  /usr/local/lib/libavcodec.so.52.37.1
7fefb25f6000-7fefb2601000 r--p 004ba000 08:01 67280
  /usr/local/lib/libavcodec.so.52.37.1
7fefb2601000-7fefb260e000 rw-p 004c5000 08:01 67280
  /usr/local/lib/libavcodec.so.52.37.1
7fefb260e000-7fefb2a57000 rw-p 00000000 00:00 0
7fefb2a57000-7fefb2b02000 r-xp 00000000 08:01 67282
  /usr/local/lib/libavformat.so.52.39.2
7fefb2b02000-7fefb2d02000 ---p 000ab000 08:01 67282
  /usr/local/lib/libavformat.so.52.39.2
7fefb2d02000-7fefb2d06000 r--p 000ab000 08:01 67282
  /usr/local/lib/libavformat.so.52.39.2
7fefb2d06000-7fefb2d0f000 rw-p 000af000 08:01 67282
  /usr/local/lib/libavformat.so.52.39.2Aborted


-- 
Best,
Oleksandr
www.vertaline.com
www.vertaline.com.ua

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