我一直试图弄清楚如何旋转视频与FFmpeg。我正在处理以竖屏模式拍摄的iPhone视频。我知道如何使用MediaInfo(优秀的库,顺便说一下)确定当前的旋转程度,但我现在卡住了FFmpeg。

从我所读到的,你需要使用的是一个vfilter选项。根据我看到的,它应该是这样的:

ffmpeg -vfilters "rotate=90" -i input.mp4 output.mp4

然而,我不能让它工作。首先,-vfilters已经不存在了,现在只有-vf。其次,我得到这个错误:

No such filter: 'rotate'
Error opening filters!

据我所知,我有一个全选项的FFmpeg构建。运行ffmpeg -filters显示:

Filters:
anull            Pass the source unchanged to the output.
aspect           Set the frame aspect ratio.
crop             Crop the input video to x:y:width:height.
fifo             Buffer input images and send them when they are requested.
format           Convert the input video to one of the specified pixel formats.
hflip            Horizontally flip the input video.
noformat         Force libavfilter not to use any of the specified pixel formats
 for the input to the next filter.
null             Pass the source unchanged to the output.
pad              Pad input image to width:height[:x:y[:color]] (default x and y:
 0, default color: black).
pixdesctest      Test pixel format definitions.
pixelaspect      Set the pixel aspect ratio.
scale            Scale the input video to width:height size and/or convert the i
mage format.
slicify          Pass the images of input video on to next video filter as multi
ple slices.
unsharp          Sharpen or blur the input video.
vflip            Flip the input video vertically.
buffer           Buffer video frames, and make them accessible to the filterchai
n.
color            Provide an uniformly colored input, syntax is: [color[:size[:ra
te]]]
nullsrc          Null video source, never return images.
nullsink         Do absolutely nothing with the input video.

拥有vflip和hflip的选项很棒,但它们不能让我去我需要去的地方。我需要至少能够将视频旋转90度。270度也是个不错的选择。旋转选项去哪儿了?


当前回答

如果你不想重新编码你的视频,你的播放器可以处理旋转元数据,你可以使用ffmpeg改变元数据中的旋转:

ffmpeg -i input.m4v -map_metadata 0 -metadata:s:v rotate="90" -codec copy output.m4v

其他回答

这个脚本将输出目录结构在“fixedFiles”下的文件。目前被固定到MOV文件,并将根据视频的原始“旋转”执行一些转换。适用于运行Mavericks的Mac上的iOS捕获的视频,但应该很容易导出。依赖于同时安装exiftool和ffmpeg。

#!/bin/bash

# rotation of 90 degrees. Will have to concatenate.
#ffmpeg -i <originalfile> -metadata:s:v:0 rotate=0 -vf "transpose=1" <destinationfile>
#/VLC -I dummy -vvv <originalfile> --sout='#transcode{width=1280,vcodec=mp4v,vb=16384,vfilter={canvas{width=1280,height=1280}:rotate{angle=-90}}}:std{access=file,mux=mp4,dst=<outputfile>}\' vlc://quit

#Allowing blanks in file names
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")

#Bit Rate
BR=16384

#where to store fixed files
FIXED_FILES_DIR="fixedFiles"
#rm -rf $FIXED_FILES_DIR
mkdir $FIXED_FILES_DIR

# VLC
VLC_START="/Applications/VLC.app/Contents/MacOS/VLC -I dummy -vvv"
VLC_END="vlc://quit"


#############################################
# Processing of MOV in the wrong orientation
for f in `find . -regex '\./.*\.MOV'` 
do
  ROTATION=`exiftool "$f" |grep Rotation|cut -c 35-38`
  SHORT_DIMENSION=`exiftool "$f" |grep "Image Size"|cut -c 39-43|sed 's/x//'`
  BITRATE_INT=`exiftool "$f" |grep "Avg Bitrate"|cut -c 35-38|sed 's/\..*//'`
  echo Short dimension [$SHORT_DIMENSION] $BITRATE_INT

  if test "$ROTATION" != ""; then
    DEST=$(dirname ${f})
    echo "Processing $f with rotation $ROTATION in directory $DEST"
    mkdir -p $FIXED_FILES_DIR/"$DEST"

    if test "$ROTATION" == "0"; then
      cp "$f" "$FIXED_FILES_DIR/$f"

    elif test "$ROTATION" == "180"; then
#      $(eval $VLC_START \"$f\" "--sout="\'"#transcode{vfilter={rotate{angle=-"$ROTATION"}},vcodec=mp4v,vb=$BR}:std{access=file,mux=mp4,dst=\""$FIXED_FILES_DIR/$f"\"}'" $VLC_END )
      $(eval ffmpeg -i \"$f\" -vf hflip,vflip -r 30 -metadata:s:v:0 rotate=0 -b:v "$BITRATE_INT"M -vcodec libx264 -acodec copy \"$FIXED_FILES_DIR/$f\")

    elif test "$ROTATION" == "270"; then
      $(eval ffmpeg -i \"$f\" -vf "scale=$SHORT_DIMENSION:-1,transpose=2,pad=$SHORT_DIMENSION:$SHORT_DIMENSION:\(ow-iw\)/2:0" -r 30 -s "$SHORT_DIMENSION"x"$SHORT_DIMENSION" -metadata:s:v:0 rotate=0 -b:v "$BITRATE_INT"M -vcodec libx264 -acodec copy \"$FIXED_FILES_DIR/$f\" )

    else
#      $(eval $VLC_START \"$f\" "--sout="\'"#transcode{scale=1,width=$SHORT_DIMENSION,vcodec=mp4v,vb=$BR,vfilter={canvas{width=$SHORT_DIMENSION,height=$SHORT_DIMENSION}:rotate{angle=-"$ROTATION"}}}:std{access=file,mux=mp4,dst=\""$FIXED_FILES_DIR/$f"\"}'" $VLC_END )
      echo ffmpeg -i \"$f\" -vf "scale=$SHORT_DIMENSION:-1,transpose=1,pad=$SHORT_DIMENSION:$SHORT_DIMENSION:\(ow-iw\)/2:0" -r 30 -s "$SHORT_DIMENSION"x"$SHORT_DIMENSION" -metadata:s:v:0 rotate=0 -b:v "$BITRATE_INT"M -vcodec libx264 -acodec copy \"$FIXED_FILES_DIR/$f\" 
      $(eval ffmpeg -i \"$f\" -vf "scale=$SHORT_DIMENSION:-1,transpose=1,pad=$SHORT_DIMENSION:$SHORT_DIMENSION:\(ow-iw\)/2:0" -r 30 -s "$SHORT_DIMENSION"x"$SHORT_DIMENSION" -metadata:s:v:0 rotate=0 -b:v "$BITRATE_INT"M -vcodec libx264 -acodec copy \"$FIXED_FILES_DIR/$f\" )

    fi

  fi

echo 
echo ==================================================================
sleep 1
done

#############################################
# Processing of AVI files for my Panasonic TV
# Use ffmpegX + QuickBatch. Bitrate at 16384. Camera res 640x424
for f in `find . -regex '\./.*\.AVI'` 
do
  DEST=$(dirname ${f})
  DEST_FILE=`echo "$f" | sed 's/.AVI/.MOV/'`
  mkdir -p $FIXED_FILES_DIR/"$DEST"
  echo "Processing $f in directory $DEST"
  $(eval ffmpeg -i \"$f\" -r 20 -acodec libvo_aacenc -b:a 128k -vcodec mpeg4 -b:v 8M -flags +aic+mv4 \"$FIXED_FILES_DIR/$DEST_FILE\" )
echo 
echo ==================================================================

done

IFS=$SAVEIFS

如果你得到一个“Codec是实验性的,但实验性Codec未启用”的错误,使用这个:

ffmpeg -i inputFile -vf "transpose=1" -c:a copy outputFile

发生在我的一些。mov文件与aac音频。

你试过转置吗?就像(来自另一个答案)

 ffmpeg -i input -vf transpose=2 output

如果您使用的是旧版本,如果您想使用转置特性,则必须更新ffmpeg,因为它是在2011年10月添加的。

FFmpeg下载页面提供了可以直接执行的静态构建,而无需编译它们。

默认情况下,ffmpeg.exe旋转过滤器可能会切割图像。为了保持原来的窗口宽度和高度,逆时针旋转90°,可以使用:


ffmpeg.exe -i infilename -vf rotate=-PI/2:oh=iw:ow=ih outfilename

通过添加:oh=iw:ow=ih,指定[外窗宽]=[输入窗高],[外窗宽]=[输入窗高],这相当于-vf转置=2,旋转而不切割图像。

在这里:

iw: input width
ih: input height
ow: output width
oh: output height

请参阅https://ffmpeg.org/ffmpeg-filters.html#rotate

对我来说是这样的

顺时针旋转

 ffmpeg -i "path_source_video.mp4" -filter:v "transpose=1" "path_output_video.mp4"

逆时针方向旋转

 ffmpeg -i "path_source_video.mp4" -filter:v "transpose=0,transpose=1,transpose=0" -acodec copy "path_output_video.mp4"

我使用zeranoe包