We recorded a video of a talk and its audio on separate devices (camcorder and phone). Both are relatively new an the camera indeed does nice full HD video. My problem is that they both seem out of sync when seen from within the editing progams.
I post the Mediainfo data of the video and audio below. Basically, when I import both the video and audio into Lightworks (or some other software), I can align the waveforms but they drift from each other. I have wondered whether this is due to different bitrates, but adjusting the speed does not seem to help. Is this our problem, editing program's limitations, the medium, file formats...?
Any hint on improving our workflow would be appreciated. Our recording equipment is a Canon Legria R68 and an Android (Moto G 3rd gen) mobile phone for the video and audio, respectively.
Video info (one chunck out of two) General ID : 0 (0x0) Format : BDAV Format/Info : Blu-ray Video File size : 3.88 GiB Duration : 37 min 59 s Overall bit rate mode : Variable Overall bit rate : 14.6 Mb/s Maximum Overall bit rate : 18.0 Mb/s Video ID : 4113 (0x1011) Menu ID : 1 (0x1) Format : AVC Format/Info : Advanced Video Codec Format profile : High@L4 Format settings, CABAC : Yes Format settings, ReFrames : 2 frames Format settings, GOP : M=3, N=12 Codec ID : 27 Duration : 37 min 59 s Bit rate mode : Variable Bit rate : 13.8 Mb/s Maximum bit rate : 16.0 Mb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate : 25.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Interlaced Scan type, store method : Separated fields Scan order : Top Field First Bits/(Pixel*Frame) : 0.266 Stream size : 3.66 GiB (94%) Audio ID : 4352 (0x1100) Menu ID : 1 (0x1) Format : AC-3 Format/Info : Audio Coding 3 Mode extension : CM (complete main) Format settings, Endianness : Big Codec ID : 129 Duration : 37 min 59 s Bit rate mode : Constant Bit rate : 256 kb/s Channel(s) : 2 channels Channel positions : Front: L R Sampling rate : 48.0 kHz Frame rate : 31.250 FPS (1536 spf) Bit depth : 16 bits Compression mode : Lossy Delay relative to video : -80 ms Stream size : 69.6 MiB (2%) ---- Audio file info (it is longer because it covers the whole session) Format : MPEG-4 Format profile : 3GPP Media Release 4 Codec ID : 3gp4 (isom/3gp4) File size : 61.9 MiB Duration : 1 h 8 min Overall bit rate mode : Constant Overall bit rate : 126 kb/s Encoded date : UTC 2016-11-10 18:27:57 Tagged date : UTC 2016-11-10 18:27:57 Audio ID : 1 Format : AAC Format/Info : Advanced Audio Codec Format profile : LC Codec ID : 40 Duration : 1 h 8 min Bit rate mode : Constant Bit rate : 128 kb/s Channel(s) : 1 channel Channel positions : Front: C Sampling rate : 44.1 kHz Frame rate : 43.066 FPS (1024 spf) Compression mode : Lossy Stream size : 61.2 MiB (99%) Title : SoundHandle Language : English Encoded date : UTC 2016-11-10 18:27:57 Tagged date : UTC 2016-11-10 18:27:57