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mr98978428
Participant
March 25, 2015
Answered

Converting Downloaded FLV Recording to MP4 using FFMPEG

  • March 25, 2015
  • 3 replies
  • 2017 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.

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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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