mkvmerge - AAC found, but decoder config data has length 0. Skipping this track.
Working on a few downloaded MPEG-4/AAC-LTP files and mkvtoolnix/mkvmerge is throwing warnings. A file will be created without an audio stream, or if I add a separate version of that audio file, no output will be created at all.
Any ideas on how I might work around this? Interesting, handbrake crashing on reading these files. However, no player I have appears to have trouble in playback. Something I haven't come across before.
Commands
$ apt version mkvtoolnix-gui
20.0.0-0~bunkus01
$ mkvtoolnix-gui /media/file.mp4
Tab::addOrAppendFiles: TID 0x7fc4b5771900
FileIdentificationWorker::addFilesToIdentify: adding ("/media/file.mp4")
FileIdentificationWorker::identifyFiles: starting loop
FileIdentificationWorker::identifyThisFile: starting for "/media/file.mp4"
FileIdentificationWorker::identifyThisFile: thread ID: 0x7fc49a42a700
Cache::fetch: conditions OK, returning cached content
FileIdentifier::retrievePositiveResultFromCache: cached content fetched, loading settings from it
FileIdentifier::retrievePositiveResultFromCache: loaded
FileIdentificationWorker::identifyFiles: pack finished, notifying
FileIdentificationWorker::identifyFiles: exiting loop (nothing left to do)
updateProgress: total 0 numDone 0 numRunning 0 numPendingAuto 1 runningProgress 0
updateProgress: total 0 numDone 0 numRunning 1 numPendingAuto 0 runningProgress 0
updateProgress: total 36 numDone 0 numRunning 1 numPendingAuto 0 runningProgress 36
updateProgress: total 71 numDone 0 numRunning 1 numPendingAuto 0 runningProgress 71
updateProgress: total 100 numDone 0 numRunning 1 numPendingAuto 0 runningProgress 100
updateProgress: total 100 numDone 1 numRunning 0 numPendingAuto 0 runningProgress 0
Tab::addOrAppendFiles: TID 0x7fc4b5771900
Error from mkvtoolnix-gui/mkvmerge
Track 1: AAC found, but decoder config data has length 0.
Quicktime/MP4 reader: The AAC track 1 is missing the esds atom/the decoder config. Skipping this track.
MediaInfo of one of these MPEG-4/AAC-LTP files.
General
Complete name : /media/file.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/iso6/mp41)
File size : 348 MiB
Duration : 10mn 14s
Overall bit rate : 4 743 Kbps
Writing application : Lavf58.7.100
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 10mn 14s
Bit rate : 4 610 Kbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 23.976 (24000/1001) fps
Minimum frame rate : 23.810 fps
Maximum frame rate : 24.390 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.093
Stream size : 338 MiB (97%)
Writing library : x264 core 138
Encoding settings : cabac=1 / ref=4 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=10 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=32 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-3 / threads=32 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=0 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=0 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=48 / keyint_min=23 / scenecut=0 / intra_refresh=0 / rc_lookahead=48 / rc=crf / mbtree=1 / crf=19.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / vbv_maxrate=5000 / vbv_bufsize=10000 / crf_max=0.0 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:0.80
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LTP
Codec ID : 40
Duration : 10mn 14s
Bit rate : 128 Kbps
Channel(s) : 2 channels
Channel(s)_Original : 1 channel
Channel positions : Front: C
Sampling rate : 64.0 KHz
Frame rate : 62.500 fps (1024 spf)
Compression mode : Lossy
Stream size : 9.39 MiB (3%)
Default : Yes
Alternate group : 1
Edited by Moritz Bunkus