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Diffstat (limited to 'doc/faq.texi')
| -rw-r--r-- | doc/faq.texi | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/doc/faq.texi b/doc/faq.texi index 79ef3b5feb..ac06ebffcd 100644 --- a/doc/faq.texi +++ b/doc/faq.texi @@ -216,15 +216,14 @@ equally humble @code{copy} under Windows), and finally transcoding back to your format of choice. @example -avconv -i input1.avi -same_quant intermediate1.mpg -avconv -i input2.avi -same_quant intermediate2.mpg +avconv -i input1.avi intermediate1.mpg +avconv -i input2.avi intermediate2.mpg cat intermediate1.mpg intermediate2.mpg > intermediate_all.mpg -avconv -i intermediate_all.mpg -same_quant output.avi +avconv -i intermediate_all.mpg output.avi @end example -Notice that you should either use @code{-same_quant} or set a reasonably high -bitrate for your intermediate and output files, if you want to preserve -video quality. +Notice that you should set a reasonably high bitrate for your intermediate and +output files, if you want to preserve video quality. Also notice that you may avoid the huge intermediate files by taking advantage of named pipes, should your platform support it: @@ -232,10 +231,10 @@ of named pipes, should your platform support it: @example mkfifo intermediate1.mpg mkfifo intermediate2.mpg -avconv -i input1.avi -same_quant -y intermediate1.mpg < /dev/null & -avconv -i input2.avi -same_quant -y intermediate2.mpg < /dev/null & +avconv -i input1.avi -y intermediate1.mpg < /dev/null & +avconv -i input2.avi -y intermediate2.mpg < /dev/null & cat intermediate1.mpg intermediate2.mpg |\ -avconv -f mpeg -i - -same_quant -c:v mpeg4 -acodec libmp3lame output.avi +avconv -f mpeg -i - -c:v mpeg4 -acodec libmp3lame output.avi @end example Similarly, the yuv4mpegpipe format, and the raw video, raw audio codecs also @@ -262,7 +261,7 @@ cat temp1.a temp2.a > all.a & cat temp1.v temp2.v > all.v & avconv -f u16le -acodec pcm_s16le -ac 2 -ar 44100 -i all.a \ -f yuv4mpegpipe -i all.v \ - -same_quant -y output.flv + -y output.flv rm temp[12].[av] all.[av] @end example |