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I want to determine stream size(not the video size) and using the following ffprobe command to make this work

ffprobe -v error -count_packets -select_streams a:0 -show_entries stream=size my_input_file_name

But this is not working, and producing no output, Can anybody point the issue with this command

user2528012
  • 417

2 Answers2

14

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
Gyan
  • 36,303
  • Can this not be done only using ffprobe? Like analysing the packets or frames show_frames,show_packets output? – user2528012 Sep 09 '17 at 12:38
  • You want a sum, not individual packet info, so no. – Gyan Sep 09 '17 at 14:20
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    If I sum up the size attribute of -show_packets command then do you think this will work? ffprobe -v error -show_packets -select_streams a -show_entries packet=size -of default=nokey=1:noprint_wrappers=1 video.mp4 – user2528012 Sep 09 '17 at 14:53
  • Ok, that should work. Remove the -show_packets; that's unnecessary clutter. – Gyan Sep 09 '17 at 15:04
2

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.

Murilo Perrone
  • 169
  • 2
    It doesn't show stream size if the file doesn't advertise it in a tag. – André Chalella Sep 08 '22 at 21:07
  • All that's doing is reading tags. If you re-encode the MKV file without clearing out the metadata, you'll receive the wrong information. I've had mediainfo tell me the audio stream was bigger than the entire file bc of that. – Cliff Aug 17 '23 at 01:18