PhilipsOdPieca
Junior Member
When I try to export a video from the RoadRunner 505 camera:
Video: MJPG 1920x1080 25fps 18958 kbit/s [Video 0 (MJPG, 1920x1080, 25.000 fps, 18958 kbit/s)]
Audio: PCM 32000Hz 1.0 ch 512 kbit/s [Audio 1 (PCM, 32.0 kHz, 1.0 ch, 16 bit, 512 kbit/s)]
General:
Format: AVI
Format Info: Audio Video Interleave
Format Settings: BitmapInfoHeader / PcmWaveFormat
Overall Bitrate: 24.3 Mb/s
Frame Rate: 25.000 fps
Video Stream (ID 0):
Format: JPEG
Codec ID: MJPG
Bitrate: 19.0 Mb/s
Width: 1920 pixels
Height: 1080 pixels
Display Aspect Ratio: 16:9
Frame Rate: 25.000 fps
Color Space: YUV
Chroma Subsampling: 4:2:0
Bit Depth: 8 bits
Compression Mode: Lossy
Bits/(Pixel*Frame): 0.366
Audio Stream (ID 1):
Format: PCM
Format Settings: Little / Signed
Codec ID: 1
Bitstream Type: Constant
Bitrate: 512 kb/s
Channels: 1 channel
Sampling Rate: 32.0 kHz
Bit Depth: 16 bits
Alignment: Interleaved
Interleave Duration: 1000 ms (25 video frames)
This camera also creates a new file every 10 minutes. When I merge these files without decoding, keeping the original streams, in the resulting merged video the audio at the end of the video is about 1 second ahead of the video, even though at the start everything is perfectly synced.
The original 10-minute RoadRunner 505 videos have perfect audio-video synchronization at both the start and end, but after merging them in LosslessCut, the audio gradually drifts ahead of the video.
It’s not straightforward to speed up the video relative to the audio because in the merged video:
At the beginning, the video is perfectly in sync with the audio
Toward the end, the audio gradually leads the video
If I try to sync the end of the video to the audio, then at the beginning the video would lead the audio
In LosslessCut, the only merge options are:
Keep original metadata when merging (slow)
Keep all MP4/MOV metadata
Create chapters from merged segments (slow)
Always open this dialog when opening multiple files
No matter which option I select, the result is the same.
My goal: Merge these videos without decoding, copying only the streams, while keeping the entire video perfectly synchronized with the audio.
Video: MJPG 1920x1080 25fps 18958 kbit/s [Video 0 (MJPG, 1920x1080, 25.000 fps, 18958 kbit/s)]
Audio: PCM 32000Hz 1.0 ch 512 kbit/s [Audio 1 (PCM, 32.0 kHz, 1.0 ch, 16 bit, 512 kbit/s)]
General:
Format: AVI
Format Info: Audio Video Interleave
Format Settings: BitmapInfoHeader / PcmWaveFormat
Overall Bitrate: 24.3 Mb/s
Frame Rate: 25.000 fps
Video Stream (ID 0):
Format: JPEG
Codec ID: MJPG
Bitrate: 19.0 Mb/s
Width: 1920 pixels
Height: 1080 pixels
Display Aspect Ratio: 16:9
Frame Rate: 25.000 fps
Color Space: YUV
Chroma Subsampling: 4:2:0
Bit Depth: 8 bits
Compression Mode: Lossy
Bits/(Pixel*Frame): 0.366
Audio Stream (ID 1):
Format: PCM
Format Settings: Little / Signed
Codec ID: 1
Bitstream Type: Constant
Bitrate: 512 kb/s
Channels: 1 channel
Sampling Rate: 32.0 kHz
Bit Depth: 16 bits
Alignment: Interleaved
Interleave Duration: 1000 ms (25 video frames)
This camera also creates a new file every 10 minutes. When I merge these files without decoding, keeping the original streams, in the resulting merged video the audio at the end of the video is about 1 second ahead of the video, even though at the start everything is perfectly synced.
The original 10-minute RoadRunner 505 videos have perfect audio-video synchronization at both the start and end, but after merging them in LosslessCut, the audio gradually drifts ahead of the video.
It’s not straightforward to speed up the video relative to the audio because in the merged video:
At the beginning, the video is perfectly in sync with the audio
Toward the end, the audio gradually leads the video
If I try to sync the end of the video to the audio, then at the beginning the video would lead the audio
In LosslessCut, the only merge options are:
Keep original metadata when merging (slow)
Keep all MP4/MOV metadata
Create chapters from merged segments (slow)
Always open this dialog when opening multiple files
No matter which option I select, the result is the same.
My goal: Merge these videos without decoding, copying only the streams, while keeping the entire video perfectly synchronized with the audio.
