mov

问题 I'm looking Intel datasheet: Intel® 64 and IA-32 Architectures Software Developer’s Manual and I can't find the difference between MOVDQA : Move Aligned Double Quadword MOVAPS : Move Aligned Packed Single-Precision In Intel datasheet I can find for both instructions: This instruction can be used to load an XMM register from a 128-bit memory location, to store the contents of an XMM register into a 128-bit memory location, or to move data between two XMM registers. The only difference is: To

问题 I am using ffmpeg to convert videos to mp4 format. Everything works fine except with MOV format. The command I use for everything is: ffmpeg -i input.mov -strict experimental -sameq -s vga -aspect 1.7777 -vcodec libx264 -preset fast -crf 22 -y output.mp4 but the output I keep getting is: ffmpeg version 0.9, Copyright (c) 2000-2011 the FFmpeg developers built on Mar 12 2012 11:01:05 with gcc 4.4.5 configuration: --enable-libx264 --enable-gpl --disable-yasm libavutil 51. 32. 0 / 51. 32. 0

问题 What does this instruction do? mov (%r11,%r12,1), %edx 回答1: Look here. It says In the AT&T Syntax, memory is referenced in the following way, segment-override:signed-offset(base,index,scale) Down on the page there are some examples. I find this the best: GAS memory operand NASM memory operand ------------------ ------------------- (%ecx,%ebx,2) [ecx+ebx*2] mov source, destination in AT&T syntax copies the value from source to destination. Also consider the size of edx. How many bytes (4) do

问题 I want to get a frame sample (jpeg) from a video file (mov) with java. Is there an easy way to do this. When I search in google all I can find is to make mov from multiple jpgs. I dont know maybe I cannot find the right keywords. 回答1: I know that the original question is solved, nevertheless, I am posting this answer in case anyone else got stuck like I did. Since yesterday, I have tried everything, and I mean everything to do this. All available Java libraries are either out of date, not