Downloaded .mp4 audio track not working

I'm no newbie, but this one has me stumped. I hope someone smarter than me has encountered this and can offer me a solution.

I downloaded an .mp4 file and then added metadata with Subler, as I always do. After uploading to iTunes, the file played fine, but no audio. So, I went back to Subler and the audio track indicated none, 0ch. So then I played it in VLC just to be sure I didn't miss a .rar archive part and it played and sounded fine.

At this point I assumed its a Subler thing, so I took the next step and converted it to an .m4v using iFlicks2; iTunes compatible preset. It converted without a hitch, but still no audio during playback. Subler says there is now a nice AAC 3ch audio track residing in the file.

Before I go to DefCon 5 and create an .mkv and then convert that, are there any tricks or tips you may have to fix the audio glitch?

Thanks.

If VLC played it, then the audio is there. VLC plays damn near everything, go to. Go to the "Codec Information" menu and see what it says. What edit is this anyway?

TM2YC said:

If VLC played it, then the audio is there. VLC plays damn near everything, go to. Go to the "Codec Information" menu and see what it says. What edit is this anyway?

Click to expand...

It says "mp1" in the MP4Tools error log for the original .mp4 downloaded file:

"index": 1,
"codec_name": "mp1",
"codec_long_name": "MP1 (MPEG audio layer 1)",
"codec_type": "audio",
"codec_time_base": "1/48000",
"codec_tag_string": "mp4a",
"codec_tag": "0x6134706d",
"sample_fmt": "s16p",
"sample_rate": "48000",
"channels": 2,
"bits_per_sample": 0,
"r_frame_rate": "0/0",
"avg_frame_rate": "0/0",
"time_base": "1/48000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 344747904,
"duration": "7182.248000",
"bit_rate": "383999",
"nb_frames": "897781",
"disposition": {
"default": 0,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0
},
"tags": {
"creation_time": "2014-07-21 08:19:20",
"language": "eng",
"handler_name": "Alias Data Handler"
}
}
]
}

Problem Codec: mp1"

I can see the .mp4 audio file there, its just not being picked up by iTunes.

When I converted it to an .m4v with iFilcks2, the resultant file still throws off an error, but it did encode to an .mp4 audio file:

"index": 1,
"codec_type": "audio",
"codec_time_base": "0/1",
"codec_tag_string": "mp4a",
"codec_tag": "0x6134706d",
"sample_rate": "14811212",
"channels": 32767,
"bits_per_sample": 0,
"r_frame_rate": "0/0",
"avg_frame_rate": "0/0",
"time_base": "1/48000",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 344747904,
"duration": "7182.248000",
"bit_rate": "383999",
"nb_frames": "897781",
"disposition": {
"default": 0,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0
},
"tags": {
"creation_time": "2014-08-09 13:26:41",
"language": "eng"
}"

What do think? Any tips?

So my fall-back is to wring it through Handbrake, since it is the only tool I have which converts audio as well as video. I've selected the AAC (CoreAudio) 2 ch stereo mixdown encoder. It has been cooking for over an hour now, another 3.5 to go. We'll see if that fixes the problem. Otherwise, I'm going to create an .mkv container and comvert that to .m4v.

It's RangerKris' "The Shining: REDRUM edit".

Thanks.

I meant this menu on VLC

George Jetson said:

It's RangerKris' "The Shining: REDRUM edit".

Click to expand...

Thanks that's helpful as we know at least one person has watched that edit, with no problem, so the issue must be on your end. Try downloading it all again?

TM2YC said:

Thanks that's helpful as we know at least one person has watched that edit, with no problem, so the issue must be on your end. Try downloading it all again?

Click to expand...

For the record, I watched on VLC, not through iTunes.

Neglify said:

For the record, I watched on VLC, not through iTunes.

Click to expand...

Thanks Neg. Any chance you could drop it into WMP or iTunes or something else just to see what happens?

I can't get it to play at all through iTunes and it's a stuck video in WMP.

I'm going to convert the MPEG audio to AAC and remux the MP4 and see what happens.

EDIT: The converted AAC file, muxed into a new MP4 with the AVC video stream, works perfectly fine in both WMP and iTunes.

[MENTION=29468]George Jetson[/MENTION] if you want, I can PM you the AAC file and you can remux the files. I use a program called Yamb to extract/create MP4s, but it's a Windows program.

Hi guys. Thanks for all of the tips. I finally did get it to work by using the AppleTV3 preset on Handbrake. It took an eternity to run, but it worked and I'm watching it now. Some of the synchrony is pretty spooky.