can sound be enabled in this mp4?

[Anonymous]

i got an mp4 which says the audio is disabled. Here is the mediainfo. Can the audio be enabled?
________________


General
Complete name : C:\Users\sounds\film.mp4



Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 29.6 MiB
Duration : 11 min 7 s
Overall bit rate : 373 kb/s
Writing application : Lavf57.11.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L1.3
Format settings, CABAC : Yes
Format settings, ReFrames : 3 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 11 min 7 s
Bit rate : 243 kb/s
Width : 320 pixels
Height : 240 pixels
Display aspect ratio : 4:3
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) : 0.126
Stream size : 19.3 MiB (65%)

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 11 min 7 s
Bit rate mode : Constant
Bit rate : 125 kb/s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 spf)
Compression mode : Lossy
Stream size : 9.98 MiB (34%)
Default : Yes
Alternate group : 1

[sneaker]

Try:
ffmpeg -i "C:\Users\sounds\film.mp4" -map 0 -c copy "C:\Users\sounds\film_enabled.mp4"

[Anonymous]

Try:
ffmpeg -i "C:\Users\sounds\film.mp4" -map 0 -c copy "C:\Users\sounds\film_enabled.mp4"

Thanks for the suggestion but did not work. Got the second mp4 i.e enabled but no sound

[sneaker]

It worked on a sample I tested. You said "i got an mp4 which says the audio is disabled" but which program is showing you exactly what error message? Sample file?

[Anonymous]

It worked on a sample I tested. You said "i got an mp4 which says the audio is disabled" but which program is showing you exactly what error message? Sample file?

The person who gave it to me said the audio was disabled. VLC pays the video but no sound, no message just no sound.

[poisondeathray]

Maybe the person meant that the audio was disabled during recording or production ? ie. it's blank audio . In that case, you can't "enable" it because it's silent audio

Check with the person

[sneaker]

Yes, VLC respects the disabled flag. For me the command in #2 works.

Looking again at the MediaInfo log it says "Default : Yes" which I believe is MediaInfo's way of showing the disabled flag's absence in mp4 container. So there should be nothing to change. Maybe the person testing is just confusing different files. Or like poisondeathray said.

[Anonymous]

Yes, VLC respects the disabled flag. For me the command in #2 works.

Looking again at the MediaInfo log it says "Default : Yes" which I believe is MediaInfo's way of showing the disabled flag's absence in mp4 container. So there should be nothing to change. Maybe the person testing is just confusing different files. Or like poisondeathray said.

Does that mean the disabled flag is absent so there should be sound?

[sneaker]

That's what it means, yes.

[netmask56]

Extract the audio from the MP4 file as a separated audio track and examine it in an audio editor like Audacity etc. It might be a silent track...

[VideoGuruDude]

Maybe the person meant that the audio was disabled during recording or production ? ie. it's blank audio . In that case, you can't "enable" it because it's silent audio

Check with the person

^this^

You cannot "disable" a stream in a container, their are no (AFAIK) provisions for that. It would have to be done in software or hardware, but the file.. is the file.

Andrew

[sneaker]

You cannot "disable" a stream in a container, their are no (AFAIK) provisions for that.

MP4 and MKV do have flags to disable tracks. But most players will simply ignore them. As you imply, the underlying data is still there.

[VideoGuruDude]

Thanks sneaker, I learned something... now I need to google the flags, its something I have yet to encounter.

Thanks!
Andrew