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mr98978428
Participant
March 25, 2015
Answered

Converting Downloaded FLV Recording to MP4 using FFMPEG

  • March 25, 2015
  • 3 replies
  • 1991 views

We have been creating MP4s of our downloaded webinar FLVs from AdobeConnect but since February, we have been unable to generate good MP4 files.  The audio/video are not synced properly.

The FFMPEG log shows thousands of "DTS - Invalid timestamp" errors indicating the FLV files being generated are not quite the same as they were a few months ago.

Can anyone share the FFMPEG command you use to convert your AdobeConnect videos to MP4?

Thank you.

This topic has been closed for replies.
Correct answer forresttw97892848

Okay, nevermind, I got on the Adobe Connect Support Chat and they provided these settings to use:

Format – H.264

Dimensions – 880x586 [you may alter this if required]

TV Standards – NTSC or PAL

Frame Rate – 29.97fps

Pixel Aspect Ratio – Square Pixels

Bitrate Encoding ~ 500kbps [0.5Mbps]

Audio Aspects:

Format – AAC/MP3

Bit Rate – 128 kbps

Frequency ~ 48 kHz

Channel – Stereo

Encoding – 2 Pass Encode for better quality


I put that into Handbrake and it worked like a charm, no more audio sync issues.


I hope that helps

3 replies

forresttw97892848
forresttw97892848Correct answer
Participant
July 31, 2015

Okay, nevermind, I got on the Adobe Connect Support Chat and they provided these settings to use:

Format – H.264

Dimensions – 880x586 [you may alter this if required]

TV Standards – NTSC or PAL

Frame Rate – 29.97fps

Pixel Aspect Ratio – Square Pixels

Bitrate Encoding ~ 500kbps [0.5Mbps]

Audio Aspects:

Format – AAC/MP3

Bit Rate – 128 kbps

Frequency ~ 48 kHz

Channel – Stereo

Encoding – 2 Pass Encode for better quality


I put that into Handbrake and it worked like a charm, no more audio sync issues.


I hope that helps

forresttw97892848
forresttw97892848
Participant
July 31, 2015

I did find this just now, I'm going to try using these settings:

http://blogs.adobe.com/connectsupport/the-specifications-for-mp4-conversion/

forresttw97892848
forresttw97892848
Participant
July 31, 2015

I am having similar issues, our mp4 files have serious audio sync issues. The audio sync 'drifts' - in a 1 hour video the audio can be off by up to 15 seconds of more, and around 30 minutes it syncs up correctly.

I have tried Handbrake, multiple different settings, same results.

I have tried Adobe Media Encoder, multiple different settings, same results.

I must be missing something, I cannot find the optimal settings for converting flv to mp4 anywhere online to prevent this issue.

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