我正在尝试将透明的mov或flv覆盖在图像上。
我对使用ffmpeg或avconv的两个选项持开放态度。
这是我的cmd：
ffmpeg -i bg.png -i input.mov -vf \
'[0:v]setpts=PTS-STARTPTS, pad=iw*2:ih[bg]; \
[1:v]setpts=PTS-STARTPTS,scale=720:400[fg]; [bg][fg]overlay=w' -vf yadif -pix_fmt rgba -y -vcodec qtrle -an output.mov
我明白了：
ffmpeg version 0.8.9-4:0.8.9-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
built on Nov 9 2013 19:08:00 with gcc 4.6.3
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
Input #0, image2, from '/home/socialvideos/public_html/public/images/blue_bg.png':
Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
Stream #0.0: Video: png, rgb24, 720x400, 25 tbr, 25 tbn, 25 tbc
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/home/socialvideos/public_html/actor/opening/1.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2014-01-22 18:12:38
Duration: 00:00:09.28, start: 0.000000, bitrate: 119710 kb/s
Stream #1.0(eng): Video: qtrle, bgra, 1280x720, 120236 kb/s, PAR 1280:1280 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc
Metadata:
creation_time : 2014-01-22 18:12:38
Stream #1.1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Metadata:
creation_time : 2014-01-22 18:12:38
Stream #1.2(eng): Data: tmcd / 0x64636D74, 0 kb/s
Metadata:
creation_time : 2014-01-22 18:12:47
Incompatible pixel format 'rgba' for codec 'qtrle', auto-selecting format 'rgb24'
[buffer @ 0x10cf8c0] w:1280 h:720 pixfmt:bgra
[yadif @ 0x10c8980] mode:0 parity:-1 auto_enable:0
[avsink @ 0x10c8400] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed filter 0 yadif' and the filter 'out'
[yadif @ 0x10c8980] auto-inserting filter 'auto-inserted scaler 1' between the filter 'src' and the filter 'Parsed filter 0 yadif'
[scale @ 0x10cc9a0] w:1280 h:720 fmt:bgra -> w:1280 h:720 fmt:yuv420p flags:0x4
[scale @ 0x10cbdc0] w:1280 h:720 fmt:yuv420p -> w:1280 h:720 fmt:rgb24 flags:0x4
Output #0, mov, to 'out.mov':
Metadata:
encoder : Lavf53.21.1
Stream #0.0(eng): Video: qtrle, rgb24, 1280x720 [PAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Metadata:
creation_time : 2014-01-22 18:12:38
Stream mapping:
Stream #1.0 -> #0.0
Press ctrl-c to stop encoding
frame= 2 fps= 0 q=0.0 size= 654kB time=0.08 bitrate=66996.3kbits/s
frame= 5 fps= 4 q=0.0 size= 1213kB time=0.20 bitrate=49692.2kbits/s
frame= 8 fps= 4 q=0.0 size= 2068kB time=0.32 bitrate=52952.9kbits/s
frame= 10 fps= 4 q=0.0 size= 2826kB time=0.40 bitrate=57880.0kbits/s
frame= 12 fps= 4 q=0.0 size= 3621kB time=0.48 bitrate=61805.2kbits/s
frame= 14 fps= 4 q=0.0 size= 4433kB time=0.56 bitrate=64846.9kbits/s
frame= 17 fps= 4 q=0.0 size= 5598kB time=0.68 bitrate=67435.6kbits/s
frame= 19 fps= 4 q=0.0 size= 6368kB time=0.76 bitrate=68643.7kbits/s
frame= 21 fps= 4 q=0.0 size= 7145kB time=0.84 bitrate=69683.8kbits/s
frame= 23 fps= 4 q=0.0 size= 7901kB time=0.92 bitrate=70352.7kbits/s
frame= 26 fps= 4 q=0.0 size= 9179kB time=1.04 bitrate=72298.4kbits/s
frame= 28 fps= 4 q=0.0 size= 9743kB time=1.12 bitrate=71260.9kbits/s
frame= 30 fps= 4 q=0.0 size= 10562kB time=1.20 bitrate=72100.4kbits/s
frame= 32 fps= 4 q=0.0 size= 11375kB time=1.28 bitrate=72802.4kbits/s
frame= 34 fps= 4 q=0.0 size= 12162kB time=1.36 bitrate=73256.3kbits/s
frame= 37 fps= 4 q=0.0 size= 13404kB time=1.48 bitrate=74190.5kbits/s
frame= 39 fps= 4 q=0.0 size= 14080kB time=1.56 bitrate=73936.2kbits/s
frame= 41 fps= 4 q=0.0 size= 14763kB time=1.64 bitrate=73744.3kbits/s
frame= 44 fps= 4 q=0.0 size= 15690kB time=1.76 bitrate=73030.4kbits/s
frame= 47 fps= 4 q=0.0 size= 16660kB time=1.88 bitrate=72595.6kbits/s
frame= 49 fps= 4 q=0.0 size= 17418kB time=1.96 bitrate=72798.4kbits/s
frame= 51 fps= 4 q=0.0 size= 18060kB time=2.04 bitrate=72524.8kbits/s
frame= 54 fps= 4 q=0.0 size= 18805kB time=2.16 bitrate=71320.3kbits/s
frame= 56 fps= 4 q=0.0 size= 19498kB time=2.24 bitrate=71305.2kbits/s
frame= 58 fps= 4 q=0.0 size= 20178kB time=2.32 bitrate=71247.7kbits/s
frame= 60 fps= 4 q=0.0 size= 20892kB time=2.40 bitrate=71310.3kbits/s
frame= 63 fps= 4 q=0.0 size= 22028kB time=2.52 bitrate=71609.8kbits/s
frame= 65 fps= 4 q=0.0 size= 22729kB time=2.60 bitrate=71613.6kbits/s
frame= 68 fps= 4 q=0.0 size= 23827kB time=2.72 bitrate=71762.8kbits/s
frame= 71 fps= 4 q=0.0 size= 24865kB time=2.84 bitrate=71724.5kbits/s
frame= 74 fps= 4 q=0.0 size= 26029kB time=2.96 bitrate=72035.8kbits/s
frame= 76 fps= 4 q=0.0 size= 26746kB time=3.04 bitrate=72074.2kbits/s
frame= 79 fps= 4 q=0.0 size= 27642kB time=3.16 bitrate=71659.3kbits/s
frame= 82 fps= 4 q=0.0 size= 28743kB time=3.28 bitrate=71787.0kbits/s
frame= 85 fps= 4 q=0.0 size= 29929kB time=3.40 bitrate=72111.4kbits/s
frame= 87 fps= 4 q=0.0 size= 30602kB time=3.48 bitrate=72037.4kbits/s
frame= 89 fps= 4 q=0.0 size= 31242kB time=3.56 bitrate=71892.2kbits/s
frame= 92 fps= 4 q=0.0 size= 32091kB time=3.68 bitrate=71437.1kbits/s
frame= 95 fps= 4 q=0.0 size= 32972kB time=3.80 bitrate=71080.2kbits/s
frame= 98 fps= 4 q=0.0 size= 34038kB time=3.92 bitrate=71132.0kbits/s
frame= 101 fps= 4 q=0.0 size= 35037kB time=4.04 bitrate=71046.2kbits/s
frame= 104 fps= 4 q=0.0 size= 35901kB time=4.16 bitrate=70697.3kbits/s
frame= 107 fps= 4 q=0.0 size= 36980kB time=4.28 bitrate=70780.7kbits/s
frame= 109 fps= 4 q=0.0 size= 37800kB time=4.36 bitrate=71022.0kbits/s
frame= 111 fps= 4 q=0.0 size= 38488kB time=4.44 bitrate=71011.5kbits/s
frame= 114 fps= 4 q=0.0 size= 39415kB time=4.56 bitrate=70808.9kbits/s
frame= 117 fps= 4 q=0.0 size= 40404kB time=4.68 bitrate=70725.0kbits/s
frame= 119 fps= 4 q=0.0 size= 41076kB time=4.76 bitrate=70691.3kbits/s
frame= 121 fps= 4 q=0.0 size= 41885kB time=4.84 bitrate=70892.5kbits/s
frame= 123 fps= 4 q=0.0 size= 42622kB time=4.92 bitrate=70967.6kbits/s
frame= 125 fps= 4 q=0.0 size= 43368kB time=5.00 bitrate=71054.0kbits/s
frame= 127 fps= 4 q=0.0 size= 44161kB time=5.08 bitrate=71214.6kbits/s
frame= 130 fps= 4 q=0.0 size= 45070kB time=5.20 bitrate=71002.5kbits/s
frame= 132 fps= 4 q=0.0 size= 45782kB time=5.28 bitrate=71032.2kbits/s
frame= 134 fps= 4 q=0.0 size= 46599kB time=5.36 bitrate=71220.3kbits/s
frame= 136 fps= 4 q=0.0 size= 47270kB time=5.44 bitrate=71183.8kbits/s
frame= 138 fps= 4 q=0.0 size= 47865kB time=5.52 bitrate=71034.5kbits/s
frame= 140 fps= 4 q=0.0 size= 48449kB time=5.60 bitrate=70874.3kbits/s
frame= 142 fps= 4 q=0.0 size= 49013kB time=5.68 bitrate=70689.4kbits/s
frame= 144 fps= 4 q=0.0 size= 49613kB time=5.76 bitrate=70560.8kbits/s
frame= 147 fps= 4 q=0.0 size= 50683kB time=5.88 bitrate=70610.9kbits/s
frame= 149 fps= 4 q=0.0 size= 51231kB time=5.96 bitrate=70417.5kbits/s
frame= 151 fps= 4 q=0.0 size= 51734kB time=6.04 bitrate=70166.0kbits/s
frame= 153 fps= 4 q=0.0 size= 52097kB time=6.12 bitrate=69734.9kbits/s
frame= 155 fps= 4 q=0.0 size= 52591kB time=6.20 bitrate=69487.4kbits/s
frame= 157 fps= 4 q=0.0 size= 53374kB time=6.28 bitrate=69624.1kbits/s
frame= 159 fps= 4 q=0.0 size= 54086kB time=6.36 bitrate=69665.9kbits/s
frame= 161 fps= 4 q=0.0 size= 54805kB time=6.44 bitrate=69715.3kbits/s
frame= 163 fps= 4 q=0.0 size= 55574kB time=6.52 bitrate=69826.0kbits/s
frame= 166 fps= 4 q=0.0 size= 56683kB time=6.64 bitrate=69932.4kbits/s
frame= 168 fps= 4 q=0.0 size= 57421kB time=6.72 bitrate=69999.1kbits/s
frame= 170 fps= 4 q=0.0 size= 58230kB time=6.80 bitrate=70150.4kbits/s
frame= 173 fps= 4 q=0.0 size= 59357kB time=6.92 bitrate=70268.0kbits/s
frame= 176 fps= 4 q=0.0 size= 60482kB time=7.04 bitrate=70378.7kbits/s
frame= 179 fps= 4 q=0.0 size= 61346kB time=7.16 bitrate=70187.7kbits/s
frame= 181 fps= 4 q=0.0 size= 62171kB time=7.24 bitrate=70345.9kbits/s
frame= 184 fps= 4 q=0.0 size= 63299kB time=7.36 bitrate=70454.0kbits/s
frame= 186 fps= 4 q=0.0 size= 64031kB time=7.44 bitrate=70502.6kbits/s
frame= 188 fps= 4 q=0.0 size= 64701kB time=7.52 bitrate=70482.4kbits/s
frame= 191 fps= 4 q=0.0 size= 65731kB time=7.64 bitrate=70479.9kbits/s
frame= 194 fps= 4 q=0.0 size= 66823kB time=7.76 bitrate=70543.2kbits/s
frame= 197 fps= 4 q=0.0 size= 67568kB time=7.88 bitrate=70243.5kbits/s
frame= 200 fps= 4 q=0.0 size= 68378kB time=8.00 bitrate=70018.6kbits/s
frame= 203 fps= 4 q=0.0 size= 69112kB time=8.12 bitrate=69724.5kbits/s
frame= 205 fps= 4 q=0.0 size= 69872kB time=8.20 bitrate=69804.1kbits/s
frame= 207 fps= 4 q=0.0 size= 70548kB time=8.28 bitrate=69798.2kbits/s
frame= 210 fps= 4 q=0.0 size= 71469kB time=8.40 bitrate=69699.4kbits/s
frame= 213 fps= 4 q=0.0 size= 72386kB time=8.52 bitrate=69599.5kbits/s
frame= 216 fps= 4 q=0.0 size= 73281kB time=8.64 bitrate=69480.8kbits/s
frame= 219 fps= 4 q=0.0 size= 74241kB time=8.76 bitrate=69427.7kbits/s
frame= 222 fps= 4 q=0.0 size= 75010kB time=8.88 bitrate=69198.2kbits/s
frame= 225 fps= 4 q=0.0 size= 75861kB time=9.00 bitrate=69050.0kbits/s
frame= 227 fps= 4 q=0.0 Lsize= 76442kB time=9.08 bitrate=68966.0kbits/s
video:76439kB audio:0kB global headers:0kB muxing overhead 0.003299%
然而，生成的视频没有背景图像而是具有白色。请帮忙..
答案 0 :(得分：0)
ffmpeg vs“ffmpeg”正如您在控制台输出中看到的那样，从rgba到yuv420p的转换可能会丢失您的Alpha通道。我认为无法使用avconv或存储库中可用的假“ffmpeg”来避免这种情况（这些都来自Libav; FFmpeg的一个分支）。见Who can tell me the difference and relation between ffmpeg, libav, and avconv?
ffmpeg
现在你不应该感到困惑，你应该得到真正的ffmpeg。你可以：
ffmpeg或ffmpeg按照分步指南进行操作如果你懒得做任何事情，那就这样做：
wget http://ffmpeg.gusari.org/static/32bit/ffmpeg.static.32bit.$(date +"%F").tar.gz
tar xzvf ffmpeg.static.32bit.$(date +"%F").tar.gz
注意当你执行刚刚下载的二进制文件时，不要忘记用./作为./ffmpeg的前缀，或者使用完整路径，或者你可以运行假的“{{1 “而不是。
您可以使用overlay video filter中的ffmpeg选项;否则将使用默认值format=rgb：
yuv420p ffmpeg -y -i bg.png -i input.mov -filter_complex \
"[0:v]setpts=PTS-STARTPTS, pad=iw*2:ih[bg]; \
[1:v]yadif,setpts=PTS-STARTPTS,scale=720:-1,crop=iw:400[fg]; \
[bg][fg]overlay=w[out]" \
-map "[out]" -vcodec qtrle output.mov
使用-filter_complex代替-vf。
所有过滤都应在一个complex filtergraphs内进行，因此您应将filtergraph移至其他过滤器。这使您可以准确控制何时应使用yadif。
1280x720将扩展到720x405，同时保持方面。比例示例中的-1自动确定值405。然后，我添加了裁剪以移除额外的5个像素，以避免在您只是缩放到特定大小时会发生轻微的压扁。
您现在也可以删除-pix_fmt rgba，因为所有内容都将保留在RGB中。如果您发现仍然需要它，请使用format视频过滤器，例如format=rgba，以便您可以准确控制过滤器的实施时间。
我更喜欢在filtergraph中明确命名输出链接标签（在此示例中为[out]，但您几乎可以使用任意名称），然后映射它以便默认行为不会给出任何名称惊喜。
-y是一个全局选项，应在输入选项之前声明。