Help No Audio on Some MP4 Videos

[Scary]

I use a little application on my computer called iPlayer Downloader. Basically it lets me download BBC iPlayer programmes as either mp3 or mp4 files.

However when I copy one of the mp4 files to my Desire it plays but without audio. I've tried other mp4 files - one downloaded direct from YouTube and another via ZamZar and they work (as do the mp3's it produces of radio shows)

Looking at the details of the files on Quicktime it gives me these details:


Clip that doesn't work:
H.264, 483 x 272, Millions
AAC, Stereo, 48,000 kHz
FPS: 25.00

Clip that works:
AAC, Stereo (L R), 41.100 kHz
H.264, 352 x 264, Millions
FPS: 24.94

Another:
MPEG-4 video 640 x 360, millions
AAC, Stereo 9L R), 48000 kHz

I assume it's something to do with the audio format, but on the above the only difference on the non-working one is the Stereo format

Any ideas anyone?

 

[SUroot]

Do you use the rockplayerbase from the the thread about divx support? If not try that:

http://androidforums.com/htc-desire/102360-divx-support-here-rockplayerbase.html



Also, may be worth re-encoding the videos on your pc that fail using an application called handbrake:

http://handbrake.fr/


Theres no great way to get information about how aac was encoded but if you open it in foobar, there are some better details than what you can get from quickcrap

http://www.foobar2000.org/

 

[Scary]

I will try Handbrake after seeing it recommended elsewhere on this forum. I'm wondering if it can take a mp4 file and output a different type of mp4 file though?

 

[SUroot]

I will try Handbrake after seeing it recommended elsewhere on this forum. I'm wondering if it can take a mp4 file and output a different type of mp4 file though?

The h.264 is the video format and the audio format can be whatever you want and it will still be an .mp4 extension. You don't need to fix the video in the file, just the audio which is encoded separately within the same file.

EDIT>

Outputs:

• File format: MP4 and MKV
• Video: MPEG-4, H.264, or Theora
• Audio: AAC, CoreAudio AAC (OS X Only), MP3, or Vorbis. AC-3 pass-through, DTS pass-thorugh (MKV only)

 

[Scary]

Looking on the website of the software it seems I wasn't the only person having this problem (po-ru.com: iPlayer Downloader and search for 'HTC')

Apparently it can be converted with VLC amongst others but someone recommended using RockPlayer (www.diffthink.com • View topic - RockPlayer 1.0 release) and this works fine. It's a much better solution than having to convert all the files.

 

[SUroot]

Yes, that was me earlier in this thread :$

 

[Scary]

Yes, that was me earlier in this thread :$

What was?

 

[SUroot]

What was?

.......

Do you use the rockplayerbase from the the thread about divx support? If not try that:

http://androidforums.com/htc-desire/102360-divx-support-here-rockplayerbase.html

 

[Scary]

Ooops, I think I brushed over that originally because of the mention of DIVX

Thanks for you help

 

[Kryten2k35]

I've been using the handbreak program flawlessly. It's the best imho.

 

[jbhq]

any Win user with a prob playing IPlayer mp4 on Android can ...
download/install MP4Box to <x>
create bat file below in folder <x>
move downloaded mp4s to <x>
run bat file
copy to phone

involves no transcoding

batch file - lists mp4s and then processes by splitting/joining video/audio)

copy from next line >>>
dir *.mp4 /b > mp4list.txt

for /f "delims=." %%a in (mp4list.txt) do (

MP4Box -raw 1 "%%a.mp4" -out "%%a.h264"
MP4Box -raw 2 "%%a.mp4" -out "%%a.aac"
MP4Box -fps 25 -add "%%a.h264" -add "%%a.aac" -new "%%a.mp4"

del "%%a.h264"
del "%%a.aac"
)

 

[Brucew0617]

I think you can try to convert those videos to MP4 again, maybe the code of your video and audio is not susported your mobile Phone. Recently I'm using Leawo Free MP4 Converter (Free MP4 Video Converter: convert video to MP4 with video to MP4 converter for iPod, iPhone, PSP, etc! ) to convert my video to watch in my incredible S, maybe you can also try it. BTW, what's the type of your mobile phone?

 

[SUroot]

This issue is old and resolved. We are in the HTC desire forum.