![]() So, what do I have to do to make sure that audio and video are in sync throughout file_1_2_3_4? Should I convert the audio sample rate of file_1 to 48 kHz? What software do I use to do this? I heard of a software tool called MP4 Joiner. Once again, starting with the file_2 portion, the audio and video go out of sync. Once again, I used Avidemux to merge file_1 with file_2_3_4 into file_1_2_3_4. The frame width, frame height, and audio sample rate remained the same. So, I used Avidemux to change the frame rate on file_1 to 30 frames/second. I have some others that have failed with everything I have attempted. Indeed, Boilsoft's video joiner was willing to reassemble some of them perfectly. Click on File>Save>Save Video to save your output file and give it a name and extension of mp4 such as finalfile. Click on File>Open and select 1.mp4 then click on File>Append and select 2.mp4 then 3.mp4 and the rest of your files. As the resolution and encoding is a match a direct stream merge should be possible. In Avidemux select videocopy, audiocopy, formatmp4. However, the audio and video go out of sync in the file_1 portion. How can I join WMV files in Windows I have several. ![]() Repeat this steps until all files are in. When file_2_3_4_1 is played, the file_2_3_4 portion is OK. Append clips with Avidemux Click on File Append (or Ctrl+A) to append a second video at the end of the timeline. However, starting with the file_2 portion, the audio and video go out of sync. When file_1_2_3_4 is played, everything is OK during the file_1 portion. However, the audio and video in file_1_2_3_4 were not in sync. Then, once again using the "append" feature, I merged file_2_3 and file_4 into file_2_3_4, with the audio and video remaining in sync in file_2_3_4. Using the "append" feature in Avidemux v2.5.4, I merged file_2 and file_3 into file_2_3, with the audio and video remaining in sync in file_2_3. I have four MP4 files called "file_1", "file_2", "file_3" and "file_4" and I wish to merge them into one file in the following order: file_1, file_2, file_3 and file_4.įile_1 has the following characteristics: frame width = 640įile_2, file_3, and file_4 each have the following characteristics: frame width = 640
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