Hi Folks,
This is my first posting on the forum, and I’d like firstly to congratulate the devs on a really wonderful piece of software, and a good looking site too!
However, I’m having problems editing a file that I recently digitised from a VHS tape, using VLC. The capture device is a cheap VCAP303 transmitting from composite A/V to usb. I have used VLCs defaults during the capture (H.264 and MP3 I think) except that I set the video resolution to 720p. I do seem to have successfully digitised the tape, and when I play the resulting file through VLC I get both video and audio. The video is very poor, coming as it does from a 30+ year old VHS tape, and I want to improve the quality somewhat.
The problem that I have is when I load it into Shotcut. The video is there as expected, and I can make some improvements using white balance, contrast, brightness, etc. However, there seems to be no audio coming through, no audio showing on the timeline, and whatever I do I can’t get any to show up.
After some research on this forum, I tried toggling the volume button just to bottom-right of the video window, and made sure that the mute filter is not active, and that the audio button to the left of the timeline is not toggled off. However, there is no audio on the timeline, and no signs of audio on the spectrum box when activated.
Doing a little experimentation, I tried capturing short clips of other tapes using different codecs, notably vorbis, since Shotcut is also open source, but the results with audio were either no solution or didn’t even capture the video either.
Using Mediainfo, I obtained the following results from the original capture, most of which make little sense to me. I’m hoping that someone on this forum can help me solve the problem.
General
Complete name : C:\Users\User\Documents\Old_Video.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (mp41/avc1)
File size : 2.35 GiB
Duration : 3 h 17 min
Overall bit rate mode : Variable
Overall bit rate : 1 706 kb/s
Encoded date : UTC 2018-02-04 18:27:37
Tagged date : UTC 2018-02-04 18:27:37
Writing application : vlc 2.2.8 stream output
Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, RefFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 3 h 17 min
Bit rate : 1 573 kb/s
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 4:3
Frame rate mode : Variable
Frame rate : 24.971 FPS
Minimum frame rate : 1.894 FPS
Maximum frame rate : 1000 000.000 FPS
Original frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.068
Stream size : 2.17 GiB (92%)
Language : English
Encoded date : UTC 2018-02-04 18:27:37
Tagged date : UTC 2018-02-04 18:27:37
mdhd_Duration : 3266071
Audio
ID : 1
Format : mp3
Codec ID : mp3 -00
Duration : 3 h 17 min
Bit rate mode : Variable
Bit rate : 128 kb/s
Maximum bit rate : 3 344 Mb/s
Channel(s) : 2 channels
Sampling rate : 44.1 kHz
Bit depth : 16 bits
Stream size : 181 MiB (8%)
Language : English
Encoded date : UTC 2018-02-04 18:27:37
Tagged date : UTC 2018-02-04 18:27:37