Use -vf=scale=trunc(iw/2)*2:trunc(ih/2)*2 fix division by 2 error.

src/record_process.cpp

@@ -155,18 +155,6 @@ void RecordProcess::recordVideo()
         arguments << QString("ultrafast");
         arguments << savePath;
     } else {
-        // NOTE: yuv420p can make mp4 file play on mobile phone,
-        // but yuv420p will make ffmpeg got error "width/height not divisible by 2".
-        // It's welcome patch to me, to make mp4 file can play on mobile phone and fix ffmpeg error.
-
-        // Mp4 need size dvisible by 2.
-        // if (recordWidth % 2 != 0) {
-        //     recordWidth -= 1;
-        // }
-        // if (recordHeight % 2 != 0) {
-        //     recordHeight -= 1;
-        // }
-
         arguments << QString("-video_size");
         arguments << QString("%1x%2").arg(recordWidth).arg(recordHeight);
         arguments << QString("-framerate");
@@ -176,13 +164,12 @@ void RecordProcess::recordVideo()
         arguments << QString("-i");
         arguments << QString(":0.0+%1,%2").arg(recordX).arg(recordY);
 
-        // NOTE: yuv420p can make mp4 file play on mobile phone,
-        // but yuv420p will make ffmpeg got error "width/height not divisible by 2".
-        // It's welcome patch to me, to make mp4 file can play on mobile phone and fix ffmpeg error.
-
         // Most mobile mplayer can't decode yuv444p (ffempg default format) video, yuv420p looks good.
-        // arguments << QString("-pix_fmt"); 
-        // arguments << QString("yuv420p"); 
+        arguments << QString("-pix_fmt"); 
+        arguments << QString("yuv420p"); 
+
+        arguments << QString("-vf");
+        arguments << QString("scale=trunc(iw/2)*2:trunc(ih/2)*2");
 
         arguments << savePath;
     }