The ffmpeg -headers option was receiving the User-Agent value split across multiple arguments due to spaces not being properly quoted. This caused ffmpeg to interpret "Mozilla/5.0" as an output format, resulting in: [NULL @ ...] Unable to find a suitable output format for 'Mozilla/5.0' Fixed by wrapping the entire headers string in quotes so parseArgsStringToArgv treats it as a single argument. The headers string is now properly passed to ffmpeg as: -headers "User-Agent: ... \r\nConnection: ..." The fix has been applied to vendor/discord-video-stream/src/media/newApi.ts and compiled into dist/media/newApi.js. A patch file and documentation have been added to the patches/ directory for reference. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Patches
This directory contains patches for vendor dependencies that have local modifications.
ffmpeg-headers-fix.patch
Issue: Screen share streaming fails with ffmpeg error:
[NULL @ ...] Unable to find a suitable output format for 'Mozilla/5.0'
Root Cause: The @dank074/discord-video-stream library's prepareStream function passes HTTP headers to ffmpeg without proper quoting. The fluent-ffmpeg-simplified library uses parseArgsStringToArgv to parse command-line arguments, which splits strings by spaces. This causes the User-Agent header value (with spaces) to be split into multiple separate arguments instead of being kept as a single value.
Fix: Wrap the entire headers string in quotes so parseArgsStringToArgv treats it as a single argument:
// Before (broken)
command.inputOptions(
"-headers",
Object.entries(customHeaders)
.map(([k, v]) => `${k}: ${v}`)
.join("\r\n"),
);
// After (fixed)
const headersString = Object.entries(customHeaders)
.map(([k, v]) => `${k}: ${v}`)
.join("\r\n");
command.inputOptions(`-headers "${headersString}"`);
Applied To: vendor/discord-video-stream/src/media/newApi.ts (lines 263-269)
Status: Patch is applied locally. The compiled output in dist/media/newApi.js reflects this fix.
Note: This is a local patch to the vendor submodule. To make this permanent, it should be submitted as a PR to the upstream repository: https://github.com/dank074/discord-video-stream