: Represents Level 5.1 . In HEVC level notation, the value is Level 5.1 supports resolutions up to (4K) at 60 fps .
153 in decimal is 99 in hex, or could be part of a base64 string. But without context, this remains speculative.
Some media players or file analyzers (MediaInfo, FFprobe) output raw fields from unknown atoms. The string might be a concatenation of independent values: hvc1.1.6.l153.b0
Native players like Apple QuickTime and Safari strictly require the hvc1 tag for hardware-accelerated playback. Alternative tools like HandBrake frequently default to hev1 , which packages parameter sets inside the elementary stream (in-band). 2. 1 — Profile Indication
The string hvc1.1.6.L153.B0 is a specific ISO Base Media File Format (ISOBMFF) codec string : Represents Level 5
Each part of the string defines a specific technical constraint for the video stream:
In HEVC muxing, hvc1 indicates that the video parameter sets (VPS, SPS, PPS) are stored out-of-band within the sample description configuration record (the container header). But without context, this remains speculative
ffmpeg -i input_file.mp4 -c:v libx265 -tag:v hvc1 -profile:v main -level:v 5.1 -pix_fmt yuv420p -b:v 15M output_4k.mp4 Use code with caution. Copied to clipboard
It does not correspond to:
: Indicates the HEVC codec where parameter sets (VPS, SPS, PPS) are stored in the sample entry (standard for MP4 containers). : Represents the Profile ID Main Profile (8-bit color depth). : Indicates the Profile Compatibility Flags : Represents the corresponds to