Help me to join two mp4 files into one with mp4box, plz

alexVS · 3rd December 2015, 15:40

I've got 2 files from the same hockey game from youtube. And I want to join them. Originally the game was divided into 4 big parts (30 min each), and I guess they were encoded with a slightly different parameters.

But they look VERY similar.

https://drive.google.com/folderview?...U0&usp=sharing

files: 02.mp4 and 03.mp4

I tried yamb, no success (audio joined, video - only first file)
I tried use command line
"d:\yamb\mp4box.exe" -force-cat -add "d:\02.mp4#1:fps=29.970" -cat "d:\02.mp4#2:lang=en" -cat "d:\03.mp4#1:fps=29.970" -cat "d:\03.mp4#2:lang=en" -new "d:\new2.mp4"
Second part full of green arfifacts.

Help, please!

I uploaded short samples to google drive

sneaker_ger · 3rd December 2015, 17:40

One of the files uses weighted prediction and the other one does not. Such a change of encoding parameters is not allowed to happen in mp4 or mkv containers and that's why the video can get messed up if you try to append them losslessly using mp4box.

Possible solutions:
- re-encode one of them to match the encoding parameters of the other one (or if you don't know how to do that:)
- splice them in e.g. AviSynth and re-encode the complete file
- try downloading a different version from YouTube and see if it can be appended (WebM/VP9 in mkvtoolnix?)

(May work for some players but not really recommended:
- make sure all h.264 headers are repeated throughout the stream and then append losslessly.)

Soulvomit · 3rd December 2015, 18:33

I was able to losslessly join your samples with none of the playback artifacts, at least not with the latest VLC or QuickTime, but it wasn't easy. But before getting into that, can you post the YouTube links to all the parts? I would like to know whether or not the sources behave the same.

http://sendspace.com/file/ufuomw

alexVS · 4th December 2015, 16:16

Four parts of the game on youtube
https://www.youtube.com/watch?v=z0xDQ8apgVA
https://www.youtube.com/watch?v=PJknSsVdEm8
https://www.youtube.com/watch?v=e59mefFUl0I
https://www.youtube.com/watch?v=l-qZ846aOvU
Downloaded with YouTubeDownloaderHD (portable in ZIP) ver. 2.9.9.25 (saved as 480p)
02.mp4 is extraction from first, 03.mp4 is from second.

BTW I managed to join them. 02, 03 and other extractions with the help of batch file I found in the net. Just changed paths, names and it worked.

Code:

ffmpeg -y -i "01.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts "source01.ts"
ffmpeg -y -i "02.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts "source02.ts"
ffmpeg -y -i "03.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts "source03.ts"
ffmpeg -y -i "04.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts "source04.ts"
ffmpeg -y -i "05.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts "source05.ts"

ffmpeg -y -i concat:"source01.ts|source02.ts|source03.ts|source04.ts|source05.ts" -absf aac_adtstoasc -c copy -f mov "destination.mp4"
pause

I haven't any idea what ffmpeg does here, and what these parameters means, but looks like it works without reencoding the source.

foxyshadis · 5th December 2015, 09:48

The beauty of TS is that you don't need to care how segments were encoded, it doesn't strive for efficiency and just repeats each one's information constantly. MP4 is much stricter, a little unfortunate but it's a bit late to change that. MKV might be able to do it but would need some tweaking. Your solution is probably the simplest solution to keeping them in a single file without re-encoding.

3rd December 2015, 15:40	#1 \| Link
alexVS Registered User Join Date: Sep 2004 Posts: 147	Help me to join two mp4 files into one with mp4box, plz I've got 2 files from the same hockey game from youtube. And I want to join them. Originally the game was divided into 4 big parts (30 min each), and I guess they were encoded with a slightly different parameters. But they look VERY similar. https://drive.google.com/folderview?...U0&usp=sharing files: 02.mp4 and 03.mp4 I tried yamb, no success (audio joined, video - only first file) I tried use command line "d:\yamb\mp4box.exe" -force-cat -add "d:\02.mp4#1:fps=29.970" -cat "d:\02.mp4#2:lang=en" -cat "d:\03.mp4#1:fps=29.970" -cat "d:\03.mp4#2:lang=en" -new "d:\new2.mp4" Second part full of green arfifacts. Help, please! I uploaded short samples to google drive Last edited by alexVS; 3rd December 2015 at 15:44.

4th December 2015, 16:16	#4 \| Link
alexVS Registered User Join Date: Sep 2004 Posts: 147	Four parts of the game on youtube https://www.youtube.com/watch?v=z0xDQ8apgVA https://www.youtube.com/watch?v=PJknSsVdEm8 https://www.youtube.com/watch?v=e59mefFUl0I https://www.youtube.com/watch?v=l-qZ846aOvU Downloaded with YouTubeDownloaderHD (portable in ZIP) ver. 2.9.9.25 (saved as 480p) 02.mp4 is extraction from first, 03.mp4 is from second. BTW I managed to join them. 02, 03 and other extractions with the help of batch file I found in the net. Just changed paths, names and it worked. Code: ffmpeg -y -i "01.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts "source01.ts" ffmpeg -y -i "02.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts "source02.ts" ffmpeg -y -i "03.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts "source03.ts" ffmpeg -y -i "04.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts "source04.ts" ffmpeg -y -i "05.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts "source05.ts" ffmpeg -y -i concat:"source01.ts\|source02.ts\|source03.ts\|source04.ts\|source05.ts" -absf aac_adtstoasc -c copy -f mov "destination.mp4" pause I haven't any idea what ffmpeg does here, and what these parameters means, but looks like it works without reencoding the source.

3rd December 2015, 17:40	#2 \| Link
sneaker_ger Registered User Join Date: Dec 2002 Posts: 5,565	One of the files uses weighted prediction and the other one does not. Such a change of encoding parameters is not allowed to happen in mp4 or mkv containers and that's why the video can get messed up if you try to append them losslessly using mp4box. Possible solutions: - re-encode one of them to match the encoding parameters of the other one (or if you don't know how to do that:) - splice them in e.g. AviSynth and re-encode the complete file - try downloading a different version from YouTube and see if it can be appended (WebM/VP9 in mkvtoolnix?) (May work for some players but not really recommended: - make sure all h.264 headers are repeated throughout the stream and then append losslessly.)

3rd December 2015, 18:33	#3 \| Link
Soulvomit Registered User Join Date: May 2012 Posts: 28	I was able to losslessly join your samples with none of the playback artifacts, at least not with the latest VLC or QuickTime, but it wasn't easy. But before getting into that, can you post the YouTube links to all the parts? I would like to know whether or not the sources behave the same. http://sendspace.com/file/ufuomw

5th December 2015, 09:48	#5 \| Link
foxyshadis Angel of Night Join Date: Nov 2004 Location: Tangled in the silks Posts: 9,559	The beauty of TS is that you don't need to care how segments were encoded, it doesn't strive for efficiency and just repeats each one's information constantly. MP4 is much stricter, a little unfortunate but it's a bit late to change that. MKV might be able to do it but would need some tweaking. Your solution is probably the simplest solution to keeping them in a single file without re-encoding.