Re: For the pros: Different length in audio- and file of the same stream

svnpenn · #11 04-15-2012, 12:32 PM

Ok this is what I did

PAGE
be-at.tv/brands/wmc/surfcomber/waveform-with-victor-calderone-guests/ida-engberg

GET AUDIO

Code:

rtmpdump \
-r rtmp://media.cdn.be-at.tv \
-a cfx/st \
-W http://www.be-at.tv/v2/2/7/HostMovie.swf \
-y Session001216/Audio001284/128 \
-o Audio001284.flv

GET VIDEO
DownThemAll, Batch Download

Code:

video.cdn.be-at.tv/Session001216/Video002677/1000.[000:100].flv

MERGE
Merge videos with Avidemux, then combine with audio

Code:

ffmpeg -i 1000.000-100.flv -i Audio001284.flv -c copy video-audio.flv

sebastian · #12 04-22-2012, 10:31 AM

Thanks a lot guys, am going to try this!

sebastian · #13 06-05-2012, 01:54 PM

One other question: How can I append multiple files in AviDemux? Append 100 files one after one is very difficult. ;-)

svnpenn · #14 06-06-2012, 12:13 AM

Quote:

Originally Posted by sebastian

One other question: How can I append multiple files in AviDemux? Append 100 files one after one is very difficult. ;-)

Just highlight all of them and drag to the program; thats what I did.

sebastian · #15 06-06-2012, 11:12 AM

That works, thanks! And I can be sure, that AviDemux will add it in the right order (alphabetically)?

svnpenn · #16 06-06-2012, 01:58 PM

Quote:

Originally Posted by sebastian

That works, thanks! And I can be sure, that AviDemux will add it in the right order (alphabetically)?

Should do

sebastian · #17 06-07-2012, 11:02 AM

Okay I see the problem of be-at.tv now:

The videostream is missing frames every now and then. So if I use a constant frame rate, the video will always be shorter than the audiostream. I figured it out when I saw, that sometimes my downloaded video is getting slower and faster.

When watching the video via the website, the video get's resynced to the audio every few seconds.

So, right now it's turning out into the pro-question

: How can I merge the video-chunks AND have it synced to the audio?

sebastian · #18 06-08-2012, 06:42 AM

Alternatively, is there a way to stretch the video via its framerate, so that it fits the audio length?

sebastian · #19 06-08-2012, 02:35 PM

My 2nd question is answered with the following string, which syncs the video to the audiostream:

Code:

ffmpeg -i video.flv -vsync drop -i audio.flv -c copy video-audio.flv -map 1:1

If anyone does have a better solution, please help me. :-)

EDIT: That didn't help. It only changed the length of the videoindex, not the framerate. :-(