正確轉義文本過濾文本中的文本

Question

根據文檔%{}:,應該用斜槓轉義。但是當我逃離%的文字不會被添加。有錯誤消息說Stray % near ')'。但是這意味着什麼，我該如何解決它？命令和輸出：

$ /usr/bin/ffmpeg -y -i /home/www/255871.mov -af 'aresample=async=1:min_hard_comp=0.100000' -vf 'scale=480:trunc(ow/a/2)*2,transpose=1 [in];movie=watermarks/text-box440.mov,scale=320:55 [bg];[in][bg] overlay=x=20:y=main_h-80,drawtext=fontsize=20:fix_bounds=1:fontfile=Helvetica\\:Style=bold:fontcolor=0xe6b300:text=small kitten \%\):x=30:y=h-80+ascent/2:draw=gte(t\,0)\;lt(t\,5) [out]' -pix_fmt yuv420p -r 24.39 -map_metadata -1 -movflags +faststart -f mp4 -vcodec libx264 -b:v 800k -maxrate 1100k -bufsize 2M -bt 256k -profile:vbaseline -acodec libfdk_aac -ab 64k -ar 44100 -ac 1 /tmp/kitten.mp4 
ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers 
    built on Mar 15 2013 18:40:14 with gcc 4.4.6 (GCC) 20120305 (Red Hat 4.4.6-4) 
    configuration: --enable-gpl --enable-libmp3lame --enable-libvo-aacenc --enable-libx264 --enable-version3 --enable-pthreads --enable-libfaac --enable-nonfree --enable-libfdk_a 
ac --enable-fontconfig --enable-libfreetype 
    libavutil  52. 18.100/52. 18.100 
    libavcodec  54. 92.100/54. 92.100 
    libavformat 54. 63.104/54. 63.104 
    libavdevice 54. 3.103/54. 3.103 
    libavfilter  3. 42.103/3. 42.103 
    libswscale  2. 2.100/2. 2.100 
    libswresample 0. 17.102/0. 17.102 
    libpostproc 52. 2.100/52. 2.100 
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/www/255871.mov': 
    Metadata: 
    major_brand  : qt 
    minor_version : 0 
    compatible_brands: qt 
    creation_time : 2012-07-17 07:42:35 
    model   : iPhone 3GS 
    model-rus  : iPhone 3GS 
    encoder   : 4.2.1 
    encoder-rus  : 4.2.1 
    date   : 2012-07-17T10:42:35+0300 
    date-rus  : 2012-07-17T10:42:35+0300 
    make   : Apple 
    make-rus  : Apple 
    Duration: 00:00:09.38, start: 0.000000, bitrate: 790 kb/s 
    Stream #0:0(und): Video: h264 (Baseline) (avc1/0x31637661), yuv420p, 480x360, 720 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc 
    Metadata: 
     rotate   : 90 
     creation_time : 2012-07-17 07:42:35 
     handler_name : Core Media Data Handler 
    Stream #0:1(und): Audio: aac (mp4a/0x6134706D), 44100 Hz, mono, fltp, 63 kb/s 
    Metadata: 
     creation_time : 2012-07-17 07:42:35 
     handler_name : Core Media Data Handler 
[Parsed_drawtext_5 @ 0x2ae9b00] Using "/usr/share/fonts/default/Type1/n019003l.pfb" 
[libx264 @ 0x2ae7d40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX 
[libx264 @ 0x2ae7d40] profile Constrained Baseline, level 2.1 
[libx264 @ 0x2ae7d40] 264 - core 130 r2274 c832fe9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=0 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=800 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=1100 vbv_bufsize=2000 nal_hrd=none ip_ratio=1.40 aq=1:1.00 
Output #0, mp4, to '/tmp/kitten.mp4': 
    Metadata: 
    encoder   : Lavf54.63.104 
    Stream #0:0: Video: h264 ([33][0][0][0]/0x0021), yuv420p, 360x480, q=-1--1, 800 kb/s, 19512 tbn, 24.39 tbc 
    Stream #0:1: Audio: aac ([64][0][0][0]/0x0040), 44100 Hz, mono, s16, 64 kb/s 
Stream mapping: 
    Stream #0:0 -> #0:0 (h264 -> libx264) 
    Stream #0:1 -> #0:1 (aac -> libfdk_aac) 
Press [q] to stop, [?] for help 
[Parsed_drawtext_5 @ 0x2ae9b00] Stray % near ')' 
    Last message repeated 201 times 
Stray % near ')'0.0 q=27.0 size=  480kB time=00:00:07.96 bitrate= 493.4kbits/s dup=0 drop=35 
[Parsed_drawtext_5 @ 0x2ae9b00] Stray % near ')' 
    Last message repeated 77 times 
Starting second pass: moving header on top of the file 
frame= 231 fps=0.0 q=-1.0 Lsize= 1002kB time=00:00:09.47 bitrate= 866.6kbits/s dup=0 drop=50 
video:921kB audio:74kB subtitle:0 global headers:0kB muxing overhead 0.680957% 
[libx264 @ 0x2ae7d40] frame I:1  Avg QP:24.43 size: 13264 
[libx264 @ 0x2ae7d40] frame P:230 Avg QP:23.72 size: 4041 
[libx264 @ 0x2ae7d40] mb I I16..4: 24.8% 0.0% 75.2% 
[libx264 @ 0x2ae7d40] mb P I16..4: 2.3% 0.0% 4.8% P16..4: 34.4% 28.8% 9.4% 0.0% 0.0% skip:20.3% 
[libx264 @ 0x2ae7d40] coded y,uvDC,uvAC intra: 62.5% 54.2% 4.4% inter: 19.6% 20.3% 0.1% 
[libx264 @ 0x2ae7d40] i16 v,h,dc,p: 36% 29% 19% 16% 
[libx264 @ 0x2ae7d40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 21% 20% 6% 8% 7% 7% 6% 6% 
[libx264 @ 0x2ae7d40] i8c dc,h,v,p: 65% 15% 17% 3% 
[libx264 @ 0x2ae7d40] ref P L0: 93.4% 4.3% 2.3% 
[libx264 @ 0x2ae7d40] kb/s:796.32 

Answer 1

找到解決方案。此錯誤的原因是ffmpeg嘗試使用％來擴展文本，如documentation中所述：

擴展形式爲％{...}的序列。大括號 之間的文本是一個函數名稱，可能後跟以'：'分隔的參數。 如果參數包含特殊字符或分隔符（'：'或 '}'），則應將其轉義。

因此，只需將expansion=none添加到過濾器配置即可解決問題。