Record MP4 video files with multiple audio tracks
Professional broadcast cameras generally support multi-track recording to provide clearer recording effects. Sony EX280 cameras are very common models. If this kind of MP4 video file is damaged, after power failure or data loss recovery, you may encounter abnormal sound restoration, often only one audio track is repaired, and other sounds are lost, especially those with internal recording. , although there is sound and picture after the video is repaired, the sound effect is not clear. The question is, can the internal recording track be restored?
Video restoration technology to restore internally recorded sound
By manually analyzing the data structure of the sample video, and then analyzing the damaged video file, it is not difficult to find that the original data of all audio tracks is still not lost, but if you want to restore the sound you usually hear, the answer obtained through multiple repair experiences is It can be done, but has to be fixed by human intervention programmatically, because of the specificity of multi-track. The current automatic repair program does not handle multi-track data correctly. The following is the multi-track MP4 video file information for reference.
| Format | MPEG-4 |
| Commercial name | XDCAM EX 35 |
| Format profile | Base Media / Version 2 |
| Codec ID | mp42 (mp42) |
| File size | 321 MiB |
| Video | |
| ID | 1 |
| Format | MPEG Video |
| Commercial name | XDCAM EX 35 |
| Format version | Version 2 |
| Format profile | Main@High |
| Format settings | CustomMatrix / BVOP |
| Format settings, BVOP | Yes |
| Format settings, Matrix | Custom |
| Format settings, GOP | M=3, N=12 |
| Format settings, picture structure | Frame |
| Codec ID | mp4v-61 |
| Audio #1 | |
| ID | 2 |
| Format | PCM |
| Format settings | Big / Signed |
| Codec ID | twos |
| Duration | 1 min 10 s |
| Bit rate mode | Constant |
| Bit rate | 768 kb/s |
| Channel(s) | 1 channel |
| Audio #2 | |
| ID | 3 |
| Format | PCM |
| Format settings | Big / Signed |
| Codec ID | twos |
| Duration | 1 min 10 s |
| Bit rate mode | Constant |
| Bit rate | 768 kb/s |
| Channel(s) | 1 channel |
| Audio #3 | |
| ID | 4 |
| Format | PCM |
| Format settings | Big / Signed |
| Codec ID | twos |
| Duration | 1 min 10 s |
| Bit rate mode | Constant |
| Bit rate | 768 kb/s |
| Channel(s) | 1 channel |
| Audio #4 | |
| ID | 5 |
| Format | PCM |
| Format settings | Big / Signed |
| Codec ID | twos |
| Duration | 1 min 10 s |
| Bit rate mode | Constant |
| Bit rate | 768 kb/s |
| Channel(s) | 1 channel |
