I used ffmpeg to convert bbb.mp4 to dash stream. I used the ffprobe to get the bitrates of input and output (shown below) For the same resolution video 1920x1080 input has bit rate 2998 kb/s where as output has bitate of 20 kb/s. My profile is set to "-b:v:0 200K -s:v:0 640x360 -b:v:1 600K -s:v:1 852x480 -b:v:2 4000K -s:v:2 1920x1080". I am trying to understand what determines the output bit rate for the dash stream? Why does my output different from the input profile set in ffmpeg command
Input video stream - bbb.mp4
''' Duration: 00:10:34.53, start: 0.000000, bitrate: 3481 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 2998 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)'''
Output:
''' Duration: 00:10:34.60, start: 630.000000, bitrate: 20 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 20 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
major_brand : iso5
minor_version : 512
compatible_brands: iso5iso6mp41
encoder : Lavf58.42.100
Duration: 00:10:34.60, start: 630.000000, bitrate: 4 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 852x480 [SAR 640:639 DAR 16:9], 4 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
major_brand : iso5
minor_version : 512
compatible_brands: iso5iso6mp41
encoder : Lavf58.42.100
Duration: 00:10:34.60, start: 630.000000, bitrate: 1 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 640x360 [SAR 1:1 DAR 16:9], 1 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
'''
I tried to look in ffprobe documentation I could not find the definition of the bit_rate field output in ffprobe.
Can you please help me to understand this?
