Join two flv files with PHP and ffmpeg

Question

On my website I'm using phpmotion to convert videos into FLV files. What I want to do is that after the successful conversion of any new FLV file add short FLV file at the beginning.

So, I need FFMPEG command in PHP which will join the file 1.flv (intro file) with 2.flv (successful converted file) and as a result create final.flv

I tried with:

ffmpeg -i 1.flv -i 2.flv -vcodec copy -acodec copy final.flv

But without result.

Thanks for any suggestion.

What happens or doesn't happen? What error messages do you get? — Pekka, Feb 21 '11 at 16:55
@Pekka - practically nothing, a video that lasts two seconds and a black display — Sergio, Feb 21 '11 at 17:04
And 1.flv and 2.flv are both valid movie files? You are 100% sure? — Pekka, Feb 21 '11 at 17:11
maybe the two flv files are not compatible... @Sergio can you post the output of mediainfo for both files ? — SirDarius, Feb 25 '11 at 11:12

score 1 · Answer 1 · answered Feb 10 '12 at 13:18

Here is the code, you have to seperate audio and video to raw files at first, join them then again convert back to flv

mkfifo temp1.a
mkfifo temp1.v
mkfifo temp2.a
mkfifo temp2.v
mkfifo all.a
mkfifo all.v
ffmpeg -i 1.flv -vn -f u16le -acodec pcm_s16le -ac 2 -ar 44100 - > temp1.a < /dev/null &
ffmpeg -i 2.flv -vn -f u16le -acodec pcm_s16le -ac 2 -ar 44100 - > temp2.a < /dev/null &
ffmpeg -i 1.flv -an -f yuv4mpegpipe - > temp1.v < /dev/null &
{ ffmpeg -i 2.flv -an -f yuv4mpegpipe - < /dev/null | tail -n +2 > temp2.v ; } &
cat temp1.a temp2.a > all.a &
cat temp1.v temp2.v > all.v &
ffmpeg -f u16le -acodec pcm_s16le -ac 2 -ar 44100 -i all.a \
       -f yuv4mpegpipe -i all.v \
       -sameq -y output.flv
rm temp[12].[av] all.[av]

This one is working for me and, as I can see, is taken from [FFmpeg FAQ](http://ffmpeg.org/faq.html#How-can-I-join-video-files_003f) — weekens, Apr 22 '12 at 13:57

score 0 · Answer 2 · answered Feb 25 '11 at 11:06

0

I guess you can use mencoder to merge two files.

mencoder -oac copy -ovc copy -o c:\video.flv c:\a.flv c:\b.flv

answered Feb 25 '11 at 11:06

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Join two flv files with PHP and ffmpeg

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