Google's live photos unplayable

[thermatk]

I have a mix of Samsung and Pixel photos in the library and while Samsung live photos get played, the exported and/or transcoded motion photo from the Pixel ones is not being played. Console shows that MP4 gets sent from the server, but it's unplayable.

Typical message in browser console:
Media resource https://XXX.YYY.com/apps/memories/api/video/livephoto/433833?etag=8763cdd03c06868753f43a1412ebee76&liveid=self__trailer&transcode=hhm65bcf9cs0 could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006) Details: static MP4Metadata::ResultAndByteBuffer mozilla::MP4Metadata::Metadata(mozilla::ByteStream *): Cannot parse metadata

Memories version 4.10.1

Example file attached

https://user-images.githubusercontent.com/2287483/214258202-a9512dcf-0d6f-4717-8e13-e73bba5fb95b.jpg

Locally I can successfully extract the Pixel Motion Video with:

for i in PXL*.jpg; do \
  ofs=$(grep -F --byte-offset --only-matching --text ftypisom "$i"); \
  ofs=${ofs%:*}; \
  [[ $ofs ]] && dd "if=$i" "of=${i%.jpg}.mp4" bs=$((ofs-4)) skip=1; \
done