您好我最近开始使用ffmpeg，我在视频上叠加了图片以及gif文件。来到swf文件的地方ffmpeg无法识别该格式。
我尝试了下面的覆盖命令：
ffmpeg -i vid.mp4 -i swf.swf -filter_co
mplex overlay=x=100:y=100:shortest=1 -q 15 -vcodec libx264 out.mp4
ffmpeg version N-76822-g12a419d Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 5.2.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --
enable-lzma --enable-decklink --enable-zlib
libavutil 55. 9.100 / 55. 9.100
libavcodec 57. 16.100 / 57. 16.100
libavformat 57. 19.100 / 57. 19.100
libavdevice 57. 0.100 / 57. 0.100
libavfilter 6. 15.100 / 6. 15.100
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid.mp4':
Metadata:
major_brand : mp42
minor_version : 1
compatible_brands: mp42avc1
creation_time : 2009-03-02 14:42:39
Duration: 00:00:10.56, start: 0.000000, bitrate: 663 kb/s
Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, flt
p, 125 kb/s (default)
Metadata:
creation_time : 2009-03-02 14:42:39
handler_name : Apple Sound Media Handler
Stream #0:1(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yu
v420p(tv, smpte170m/smpte170m/bt709), 480x360, 196 kb/s, 24 fps, 24 tbr, 600 tbn
, 1200 tbc (default)
Metadata:
creation_time : 2009-03-02 14:42:40
handler_name : Apple Video Media Handler
Stream #0:2(eng): Data: none (rtp / 0x20707472), 202 kb/s
Metadata:
creation_time : 2009-03-02 14:42:40
handler_name : hint media handler
Stream #0:3(eng): Data: none (rtp / 0x20707472), 129 kb/s
Metadata:
creation_time : 2009-03-02 14:42:40
handler_name : hint media handler
[swf @ 00000098cdb9e000] Could not find codec parameters for stream 0 (Audio: pc
m_u8, 5512 Hz, mono, 44 kb/s): unspecified sample format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #1, swf, from 'swf.swf':
Duration: 00:00:04.90, bitrate: 196 kb/s
Stream #1:0: Audio: pcm_u8, 5512 Hz, mono, 44 kb/s
Stream #1:1: Audio: mp3, 11025 Hz, mono, s16p, 16 kb/s
Stream #1:2: Audio: mp3, 11025 Hz, mono, s16p, 16 kb/s
Stream #1:3: Audio: mp3, 11025 Hz, mono, s16p, 16 kb/s
Stream #1:4: Audio: mp3, 11025 Hz, mono, s16p, 16 kb/s
Stream #1:5: Audio: mp3, 11025 Hz, mono, s16p, 16 kb/s
Stream #1:6: Audio: mp3, 11025 Hz, mono, s16p, 16 kb/s
Stream #1:7: Audio: mp3, 11025 Hz, mono, s16p, 16 kb/s
Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_overlay
_0
任何人请建议我，如何解决此问题，甚至使用ffmpeg或任何其他类似工具从swf格式文件中获取帧。