diff --git a/vrecord b/vrecord
index fa261f70..5ac5d248 100755
--- a/vrecord
+++ b/vrecord
@@ -2003,10 +2003,12 @@ _lookup_choice(){
 
         # audio codec
         "24-bit PCM")
+            _add_mediaconch_rule_set "${AUDIO_CODEC_PCM_TEST}"
             MIDDLEOPTIONS_PRES+=(-c:a pcm_s24le)
             MIDDLEOPTIONS_PRES+=(-rf64 auto)
             AUDIO_EXT='wav' ;;
         "24-bit FLAC")
+            _add_mediaconch_rule_set "${AUDIO_CODEC_FLAC_TEST}"
             MIDDLEOPTIONS_PRES+=(-c:a flac)
             MIDDLEOPTIONS_PRES+=(-sample_fmt s32)
             MIDDLEOPTIONS_PRES+=(-bits_per_raw_sample:a 24)
@@ -2808,7 +2810,6 @@ CONTAINER_MATROSKA_TEST='
 '
 
 CODEC_GENERAL_TEST='
-    <rule name="Is the video format YUV?" value="ColorSpace" tracktype="Video" operator="=">YUV</rule>
     <rule name="Is the frame rate mode constant?" value="FrameRate_Mode" tracktype="Video" operator="=">CFR</rule>
     <rule name="Is the color space YUV?" value="ColorSpace" tracktype="Video" operator="=">YUV</rule>
     <policy type="or" name="Is the video bit depth 8 or 10?">
@@ -2895,6 +2896,52 @@ AUDIO_CODEC_FLAC_TEST='
         <rule name="Bit Depth is 24?" value="BitDepth" tracktype="Audio" operator="=">24</rule>
     </policy>
 '
+
+CONTAINER_MP4_TEST='
+    <rule name="Is the file extension mp4?" value="FileExtension" tracktype="General" operator="=">mp4</rule>
+    <rule name="Is the format MPEG-4?" value="Format" tracktype="General" operator="=">MPEG-4</rule>
+    <rule name="Is the format profile Base Media?" value="Format_Profile" tracktype="General" operator="=">Base Media</rule>
+'
+
+CODEC_H264_TEST='
+    <rule name="Is the video format H.264?" value="Format" tracktype="Video" operator="=">AVC</rule>
+    <rule name="Is the pixel format yuv420p?" value="ChromaSubsampling" tracktype="Video" operator="=">4:2:0</rule>
+    <rule name="Is the scan type progressive?" value="ScanType" tracktype="Video" operator="=">Progressive</rule>
+    <rule name="Is the frame rate mode constant?" value="FrameRate_Mode" tracktype="Video" operator="=">CFR</rule>
+'
+
+STANDARD_NTSC_ACCESS_DEINTERLACED_TEST='
+    <policy type="and" name="Is it NTSC?">
+        <rule name="Is the height 480?" value="Height" tracktype="Video" operator="=">480</rule>
+        <rule name="Is the width 720?" value="Width" tracktype="Video" operator="=">720</rule>
+        <rule name="Is the frame rate 29.970?" value="FrameRate" tracktype="Video" operator="=">29.970</rule>
+        <rule name="Is the scan type progressive?" value="ScanType" tracktype="Video" operator="=">Progressive</rule>
+        <rule name="Are the colour primaries BT.601 NTSC?" value="colour_primaries" tracktype="Video" operator="=">BT.601 NTSC</rule>
+        <rule name="Are the matrix coefficients BT.601?" value="matrix_coefficients" tracktype="Video" operator="=">BT.601</rule>
+    </policy>
+'
+
+STANDARD_PAL_ACCESS_DEINTERLACED_TEST='
+    <policy type="and" name="Is it PAL?">
+        <rule name="Is the height 576?" value="Height" tracktype="Video" operator="=">576</rule>
+        <rule name="Is the width 720?" value="Width" tracktype="Video" operator="=">720</rule>
+        <rule name="Is the frame rate 25.000?" value="FrameRate" tracktype="Video" operator="=">25.000</rule>
+        <rule name="Is the scan type progressive?" value="ScanType" tracktype="Video" operator="=">Progressive</rule>
+        <rule name="Are the colour primaries BT.601 PAL?" value="colour_primaries" tracktype="Video" operator="=">BT.601 PAL</rule>
+        <rule name="Are the matrix coefficients BT.601?" value="matrix_coefficients" tracktype="Video" operator="=">BT.601</rule>
+    </policy>
+'
+
+AUDIO_CODEC_AAC_TEST='
+    <rule name="Is the audio AAC?" value="Format" tracktype="Audio" operator="=">AAC</rule>
+    <policy type="or" name="1 or 2 channels of audio?">
+        <rule name="1 channel of audio?" value="Channels" tracktype="Audio" operator="=">1</rule>
+        <rule name="2 channels of audio?" value="Channels" tracktype="Audio" operator="=">2</rule>
+    </policy>
+    <rule name="Is the sample rate 48kHz?" value="SamplingRate" tracktype="Audio" operator="=">48000</rule>
+'
+
+
 # define mediaconch test fragment -end
 
 _start_mediaconch_policy(){
@@ -2903,6 +2950,7 @@ cat <<MC_START > "${MEDIACONCH_POLICY_TMP}"
 <?xml version="1.0"?>
 <policy type="and" name="Check validity of a vrecord output">
     <description>This policy tests FFV1 Matroska and Quicktime files made using vrecord and checks their validity</description>
+    <description>This policy tests video files made using vrecord and checks their validity against vrecord's specifications</description>
 MC_START
 }
 
@@ -2920,6 +2968,65 @@ _add_mediaconch_rule_set(){
     fi
 }
 
+_check_access_mp4_mediaconch() {
+    if [[ "${MP4_CHOICE}" = "true" ]] && [[ -f "${MP4NAME}" ]] && "${MEDIACONCH_INSTALLED}" ; then
+        _report -d "Checking access MP4 conformance against a mediaconch policy..."
+        MP4_POLICY_TMP="$(_maketemp .mediaconch_mp4.xml)"
+        cat <<MC_MP4_START > "${MP4_POLICY_TMP}"
+<?xml version="1.0"?>
+<policy type="and" name="Check validity of a vrecord Access MP4 output">
+    <description>This policy tests the access MP4 file made using vrecord and checks its validity against vrecord's access specifications</description>
+MC_MP4_START
+        echo "${CONTAINER_GENERAL_TEST}" >> "${MP4_POLICY_TMP}"
+        echo "${CONTAINER_MP4_TEST}" >> "${MP4_POLICY_TMP}"
+        echo "${CODEC_H264_TEST}" >> "${MP4_POLICY_TMP}"
+        if [[ "${STANDARD}" = "ntsc" ]] ; then
+            echo "${STANDARD_NTSC_ACCESS_DEINTERLACED_TEST}" >> "${MP4_POLICY_TMP}"
+        elif [[ "${STANDARD}" = "pal" ]] ; then
+            echo "${STANDARD_PAL_ACCESS_DEINTERLACED_TEST}" >> "${MP4_POLICY_TMP}"
+        fi
+        echo "${AUDIO_CODEC_AAC_TEST}" >> "${MP4_POLICY_TMP}"
+        cat <<MC_MP4_END >> "${MP4_POLICY_TMP}"
+</policy>
+<!-- ;) -->
+MC_MP4_END
+        MP4_REPORT_TMP="$(_maketemp _mediaconch_mp4report.xml)"
+        MP4_REPORT="${DIR}/${FULL_OUTPUT_ID}_mp4_mediaconch_report.xml"
+        MP4_POLICY="${DIR}/${FULL_OUTPUT_ID}_mp4_mediaconch_policy.xml"
+        mediaconch -fx -p "${MP4_POLICY_TMP}" "${MP4NAME}" | xmlstarlet fo > "${MP4_REPORT_TMP}"
+        MP4_STATUS="$(xmlstarlet sel -N mc="https://mediaarea.net/mediaconch" -t -v mc:MediaConch/mc:media/mc:policy/@outcome -n "${MP4_REPORT_TMP}")"
+        if [[ "${MP4_STATUS}" = "pass" ]] ; then
+            _report -dt "Access MP4 passed policy check."
+            _writeingestlog "mediaconch_mp4_outcome" "passed"
+        elif [[ "${MP4_STATUS}" = "fail" ]] ; then
+            _report -wt "The access MP4 file did not pass vrecord policy check."
+            _mv_tmp_file "${MP4_REPORT_TMP}" "${MP4_REPORT}"
+            _mv_tmp_file "${MP4_POLICY_TMP}" "${MP4_POLICY}"
+            _writeingestlog "mediaconch_mp4_outcome" "failed ${MP4_POLICY}"
+            _report -wt "See ${MP4_REPORT} for a full MediaConch policy report."
+            _report -wt "Or review this attempt to summarize the issue:"
+            xmlstarlet edit -N "mc=https://mediaarea.net/mediaconch" -d "//*[@outcome='pass']" "${MP4_REPORT}" | xmlstarlet fo
+        else
+            _report -wt "Mediaconch ended in an unexpected way for the access MP4 (status: ${MP4_STATUS})."
+            _report -wt "${MP4_REPORT_TMP}:"
+            cat "${MP4_REPORT_TMP}"
+            _writeingestlog "mediaconch_mp4_outcome" "error ${MP4_STATUS}"
+        fi
+    fi
+}
+
+_check_file_truncation() {
+    TEST_FILE="${1}"
+    TEST_LABEL="${2}"
+    if [[ -f "${TEST_FILE}" ]] ; then
+        IS_TRUNCATED=$(mediainfo --Output=XML "${TEST_FILE}" | xmlstarlet sel -t -v "//*[local-name()='IsTruncated']" -n 2>/dev/null || echo "")
+        if [[ "${IS_TRUNCATED}" = "Yes" ]] ; then
+            cowsay "$(_report -w "WARNING: MediaInfo reports that the ${TEST_LABEL} file (${TEST_FILE}) may be truncated or incomplete.")"
+        fi
+        _writeingestlog "${TEST_LABEL}_truncated" "${IS_TRUNCATED}"
+    fi
+}
+
 _add_fadgi_header2vtt(){
     VTT_FILE="${1}"
     VTT_TYPE="${2}"
@@ -3144,11 +3251,6 @@ if [[ ! "${VIDEO_CODEC_CHOICE}" = "h264" ]] ; then
     _add_mediaconch_rule_set "${CODEC_GENERAL_TEST}"
 fi
 _add_mediaconch_rule_set "${AUDIO_CODEC_GENERAL_TEST}"
-if [[ "${AUDIO_CODEC_CHOICE}" = "24-bit PCM" ]] ; then
-    _add_mediaconch_rule_set "${AUDIO_CODEC_PCM_TEST}"
-elif [[ "${AUDIO_CODEC_CHOICE}" = "24-bit FLAC" ]] ; then
-    _add_mediaconch_rule_set "${AUDIO_CODEC_FLAC_TEST}"
-fi
 
 # CLI passthrough and audiopassthrough modes
 if [[ "${RUNTYPE}" = "passthrough" ]] ; then
@@ -3247,7 +3349,7 @@ if [[ "${DEVICE_INPUT_CHOICE}" = "0" ]] ; then
             AUDIOMAP=$(sed "s/0:a:0/1:a:0/g" <<< "$AUDIOMAP")
     fi
     if [[ "${MP4_CHOICE}" = "true" ]] ; then
-        RECORDINGFILTER_MP4+=",bwdif,format=yuv420p"
+        RECORDINGFILTER_MP4+=",bwdif=send_frame,format=yuv420p"
         RECORD_COMMAND_MP4+=(-filter_complex "[0:v:0]${RECORDINGFILTER_MP4#,*}[mp4_v_out];${AUDIOMAP_MP4}")
         MP4NAME="${DIR}/${FULL_OUTPUT_ID}.mp4"
         EXTRAOUTPUTS+=("${MIDDLEOPTIONS_ALL[@]}" -movflags write_colr+faststart "${RECORD_COMMAND_MP4[@]}" -c:v h264 -g 12 -profile:v main -level "${ACCESS_MP4_LEVEL}" -b:v "${ACCESS_MP4_BITRATE}" -c:a aac -map "[mp4_v_out]" "${AUDIO_CHANNEL_MAP[@]:2}" "${MP4NAME}")
@@ -3564,26 +3666,40 @@ if [[ "${DEVICE_INPUT_CHOICE}" = 0 ]] ; then
         _writeingestlog "Decklink input buffer overrun" "Yes"
     fi
 
-    # policy checks with mediaconch
-    if "$MEDIACONCH_INSTALLED" ; then
+    # mediaconch policy check on the preservation output
+    if "${MEDIACONCH_INSTALLED}" ; then
         _report -d "Checking file conformance against a mediaconch policy..."
-        STATUS=$(mediaconch -fx -p "${MEDIACONCH_POLICY_TMP}" "${VRECORD_OUTPUT}" | xmlstarlet sel -N mc="https://mediaarea.net/mediaconch" -t -v mc:MediaConch/mc:media/mc:policy/@outcome -n)
+        MEDIACONCH_REPORT="${DIR}/${FULL_OUTPUT_ID}_mediaconch_report.xml"
+        MEDIACONCH_REPORT_TMP="$(_maketemp _mediaconch_report.xml)"
+        MEDIACONCH_POLICY="${DIR}/${FULL_OUTPUT_ID}_mediaconch_policy.xml"
+        mediaconch -fx -p "${MEDIACONCH_POLICY_TMP}" "${VRECORD_OUTPUT}" | xmlstarlet fo > "${MEDIACONCH_REPORT_TMP}"
+        STATUS="$(xmlstarlet sel -N mc="https://mediaarea.net/mediaconch" -t -v mc:MediaConch/mc:media/mc:policy/@outcome -n "${MEDIACONCH_REPORT_TMP}")"
         if [[ "${STATUS}" = "pass" ]] ; then
             _report -dt "File passed policy check for the video."
             _writeingestlog "mediaconch_outcome" "passed"
         elif [[ "${STATUS}" = "fail" ]] ; then
             _report -wt "File did not pass vrecord policy check and may not conform to digital preservation standards."
-            mediaconch -fx -p "${MEDIACONCH_POLICY_TMP}" "${VRECORD_OUTPUT}" | xmlstarlet fo > "${DIR}/${FULL_OUTPUT_ID}_mediaconchreport.xml"
-            _mv_tmp_file "${MEDIACONCH_POLICY_TMP}" "${DIR}/${FULL_OUTPUT_ID}_mediaconch_policy.xml"
-            _writeingestlog "mediaconch_outcome" "failed ${DIR}/${FULL_OUTPUT_ID}_mediaconch_policy.xml"
-            _report -wt "See ${DIR}/${FULL_OUTPUT_ID}_mediaconchreport.xml for a full MediaConch policy report."
+            _mv_tmp_file "${MEDIACONCH_REPORT_TMP}" "${MEDIACONCH_REPORT}"
+            _mv_tmp_file "${MEDIACONCH_POLICY_TMP}" "${MEDIACONCH_POLICY}"
+            _writeingestlog "mediaconch_outcome" "failed ${MEDIACONCH_POLICY}"
+            _report -wt "See ${MEDIACONCH_REPORT} for a full MediaConch policy report."
             _report -wt "Or review this attempt to summarize the issue:"
-            xmlstarlet edit -N "mc=https://mediaarea.net/mediaconch" -d "//*[@outcome='pass']" "${DIR}/${FULL_OUTPUT_ID}_mediaconchreport.xml"
+            xmlstarlet edit -N "mc=https://mediaarea.net/mediaconch" -d "//*[@outcome='pass']" "${MEDIACONCH_REPORT}" | xmlstarlet fo
         else
-            _report -wt "Mediaconch ended in an unexpected way (${STATUS}). Here is its output."
-            mediaconch -p "${MEDIACONCH_POLICY_TMP}" "${VRECORD_OUTPUT}"
+            _report -wt "Mediaconch ended in an unexpected way (status: ${STATUS}). Here is its output."
+            _report -wt "${MEDIACONCH_REPORT}:"
+            cat "${MEDIACONCH_REPORT}"
+            _writeingestlog "mediaconch_outcome" "error ${STATUS}"
         fi
     fi
+    # mediaconch policy check on the access MP4
+    _check_access_mp4_mediaconch
+
+    # check file truncation
+    _check_file_truncation "${VRECORD_OUTPUT}" "preservation"
+    if [[ "${MP4_CHOICE}" = "true" ]] && [[ -f "${MP4NAME}" ]] ; then
+        _check_file_truncation "${MP4NAME}" "access_mp4"
+    fi
 
     # embed logs in Matroska files
     if "$MKVPROPEDIT_INSTALLED" ; then