Encrypted segment using MPEG-CENC method is not playable

[diogoazevedos]

I’m trying to encrypt the attached segment using mp4encrypt using MPEG-CENC method, but the resulting segment becomes unplayable:

mp4encrypt --method MPEG-CENC \
  --key 1:4a13a4c5449b903ca558716341531799:random \
  --property 1:KID:a167ef50633c27f314f36a038ef20d6e  \
  clear/154023527127780.mp4 cenc/154023527127780.mp4

Shaka Player throws MediaError(3,,CHUNK_DEMUXER_ERROR_APPEND_FAILED: Incorrect CENC subsample size.).
Decrypting the encrypted segment using mp4decrypt and checking the integrity using FFmpeg, results into:

mp4decrypt --key a167ef50633c27f314f36a038ef20d6e:4a13a4c5449b903ca558716341531799 \
  cenc/154023527127780.mp4 clear/154023527127780.mp4

ffmpeg -v error -i clear/154023527127780.mp4 -f null -

[h264 @ 0x14263a4c0] Invalid NAL unit size (337906356 > 1).
[h264 @ 0x14263a4c0] Error splitting the input into NAL units.
[vist#0:0/h264 @ 0x142612c60] Error submitting packet to decoder: Invalid data found when processing input
[h264 @ 0x14260a400] Invalid NAL unit size (1672766743 > 1).
[h264 @ 0x14260a400] Error splitting the input into NAL units.
[vist#0:0/h264 @ 0x142612c60] Error submitting packet to decoder: Invalid data found when processing input
[h264 @ 0x1426438d0] Invalid NAL unit size (-334245472 > 1).
[h264 @ 0x1426438d0] Error splitting the input into NAL units.
[vist#0:0/h264 @ 0x142612c60] Decoding error: Invalid data found when processing input

154023527127780.mp4

[barbibulle]

When encrypting a segment by itself, you need to pass in a reference to the unit segment, where some of the encryption parameters are stored (that info is only in the init segment and not repeated in each individual segment).

[diogoazevedos]

@barbibulle Yup, the attached file above is the concat of the init and fragment.