How to determine video stream size
Perform a null mux.
ffmpeg -i input -map 0:a:0 -c copy -f null -
The final readout will have that info:
video:0kB audio:2684kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
For a simple and immediate way of obtaining detailed info about a media file, try mediainfo utility. It will specify the video/audio stream sizes too.
mediainfo MyFilename.mp4 for basic info
mediainfo --fullscan MyFilename.mp4 for more detailed info
Output example:
~> mediainfo MyFilename.mp4 General Complete name : ~/MyFilename.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2) File size : 1.03 GiB Duration : 3 h 9 min Overall bit rate mode : Variable Overall bit rate : 781 kb/s Encoded date : UTC 2021-10-08 21:36:28 Tagged date : UTC 2021-10-08 21:36:28 Video ID : 2 Format : AVC Format/Info : Advanced Video Codec Format profile : Baseline@L4 Format settings : 1 Ref Frames Format settings, CABAC : No Format settings, Reference frames : 1 frame Format settings, GOP : M=1, N=48 Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 3 h 9 min Duration_LastFrame : -48 ms Bit rate : 712 kb/s Nominal bit rate : 1 000 kb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 8.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.043 Stream size : 963 MiB (91%) Writing library : x264 core 148 r2M 3713d6c Encoding settings : cabac=0 / ref=1 / deblock=0:0:0 / analyse=0:0 / me=dia / subme=0 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=48 / keyint_min=4 / scenecut=0 / intra_refresh=0 / rc=abr / mbtree=0 / bitrate=1000 / ratetol=1.0 / qcomp=0.60 / qpmin=20 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=0 Language : English Encoded date : UTC 2021-10-08 21:36:28 Tagged date : UTC 2021-10-08 21:36:28 Codec configuration box : avcC Audio ID : 1 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 3 h 9 min Bit rate mode : Variable Bit rate : 68.3 kb/s Maximum bit rate : 89.1 kb/s Channel(s) : 1 channel Channel layout : C Sampling rate : 16.0 kHz Frame rate : 15.625 FPS (1024 SPF) Compression mode : Lossy Stream size : 92.5 MiB (9%) Language : English Encoded date : UTC 2021-10-08 21:36:28 Tagged date : UTC 2021-10-08 21:36:28
See original post and other tools here.