Loper · Broadcast, IPTV & streaming
Open .ism files on your Mac.
.ism .ismc
Microsoft Smooth Streaming client manifests: quality levels, bitrates and chunk timing.
Loper is a free, minimal editor for macOS that opens Smooth Streaming manifest (.ism, .ismc) instantly and colors every part of the file, so you find the value you need at a glance and can fix it right there. No IDE, no project to load, no gray wall of text.
Show the file as text
<SmoothStreamingMedia MajorVersion="2" MinorVersion="2" Duration="9000000000" TimeScale="10000000"> <StreamIndex Type="video" Chunks="450" QualityLevels="3" Url="QualityLevels({bitrate})/Fragments(video={start time})"> <QualityLevel Index="0" Bitrate="6000000" FourCC="H264" MaxWidth="1920" MaxHeight="1080"/> <QualityLevel Index="1" Bitrate="3000000" FourCC="H264" MaxWidth="1280" MaxHeight="720"/> <QualityLevel Index="2" Bitrate="1200000" FourCC="H264" MaxWidth="854" MaxHeight="480"/> <c t="0" d="20000000"/> </StreamIndex></SmoothStreamingMedia>How to open .ism files
- Download Loper (free, Apple silicon, signed and notarized) and move it to Applications.
- Double-click your .ism file, drag it onto the Loper window, or right-click it and choose Open With › Loper.
- Want every .ism file to open in Loper? Choose Loper › Make Loper the Default Editor….