Revert "使用mov容器替换mp4容器，支持音频编码格式为g711的视频录制"

This reverts commit 68691c0.

Author: SundoggyNew

ijkmedia/ijkplayer/ff_ffplay.c

@@ -5399,7 +5399,7 @@ int ffp_start_record(FFPlayer *ffp, const char *file_name)
                 goto end;
             }
             // 初始化一个用于输出的AVFormatContext结构体
-            avformat_alloc_output_context2(&ffp->m_ofmt_ctx, NULL, "mov", file_name);
+            avformat_alloc_output_context2(&ffp->m_ofmt_ctx, NULL, "mp4", file_name);
             if (!ffp->m_ofmt_ctx) {
                 av_log(ffp, AV_LOG_ERROR, "===Could not create output context filename is %s\n", file_name);
                 goto end;