I have an video file containing a "blank" video stream and an audio track.
It plays just fine in Chrome or VLC, but in Quicktime or Safari I get only the "video" playing (as in, the slider moves to show progress, but no sound is produced).
Here's the media-info output for the file. Can someone figure out what's wrong with it and why it'd be an issue for Safari? My understanding is, it's simply AVC + MP3 in an MP4 container:
General
Complete name : 1_11.instrumental.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 10.9 MiB
Duration : 4 min 36 s
Overall bit rate : 330 kb/s
Writing application : Lavf58.64.100
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L1
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 4 min 36 s
Bit rate : 2 936 b/s
Width : 64 pixels
Height : 64 pixels
Display aspect ratio : 1.000
Frame rate mode : Constant
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.029
Stream size : 99.0 KiB (1%)
Writing library : x264 core 161 r3027 4121277
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=2 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Codec configuration box : avcC
Audio
ID : 2
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Format settings : Joint stereo
Codec ID : mp4a-6B
Duration : 4 min 36 s
Bit rate mode : Constant
Bit rate : 320 kb/s
Channel(s) : 2 channels
Sampling rate : 44.1 kHz
Compression mode : Lossy
Stream size : 10.5 MiB (97%)
Writing library : LAME3.100
Default : Yes
Alternate group : 1