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MP4 only sound, no video.

Hi

I am having trouble with a mp4 file that has sound, but shows no video.
It is played without problems in VLC player.

Here is the URL:
http://128.140.176.16:38080/vid/jwplayer.html

The MP4 is coverted from AVI file by using following command line:
ffmpeg -i "correct.avi" -strict -2 -acodec aac -ar 22050 -ab 48k -ac 2 -s "1022"x"601" -vcodec libx264 -b 1200k -flags +loop+mv4 -cmp 256 -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -trellis 1 -refs 5 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 1200k -maxrate 1200k -bufsize 1200k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -r 30 -g 90 -async 2 -v 0 "correct.mp4"

The original AVI file is here:
http://128.140.176.16:38080/vid/correct.avi

The mp4 file is here:
http://128.140.176.16:38080/vid/correct.mp4


Thanks,
Kiril

7 Community Answers

Up Down

Ethan Feldman

JW Player Support Agent  
0 rated :

You need to make sure the video encoding is H.264. I would try to re encode using HandBrake.

Up Down

JW Player

User  
0 rated :

Hmm, but the video is encoded with open source H.264 encoder - see the command line -vcodec libx264

Also when opened in VLC the Media information shows "Codec: H264 - MPEG-4 AVC (part 10) (avc1)"

Isn't that the correct H.264?

Please could you provide more information about why it is the wrong codec?

Thanks.

Up Down

Ethan Feldman

JW Player Support Agent  
0 rated :

Download and verify the file in the QuickTime media inspector…

Up Down

JW Player

User  
0 rated :

I verified it with QuickTime Movie inspector:

Format: H.264, 1022 x 601 Millions
Movie FPS: 30.00
Playing FPS: 30.00
Data size: 579 KB
Date rate: 550.22 kbits/sec

Hmm it appears to be a H.264 after all.

Is it possible that the codec uses some features not supported by jwplayer decoder?

Up Down

Ethan Feldman

JW Player Support Agent  
1 rated :

I just downloaded the file correct.mp4, and the file plays back black in Quicktime on my Win7 desktop. It works in VLC though.

Up Down

JW Player

User  
-1 rated :

Super, Is it played in jwplayer too?

Up Down

Ethan Feldman

JW Player Support Agent  
0 rated :

No, it is not. What I am saying is that QuickTime is black, too. So something is not encoded properly.

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