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feat: Implement hardware-accelerated HLS transcoding with granular controls, smart stereo downmixing, and robust support for MKV and 10-bit HEVC playback.

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This commit is contained in:
Trevor Mears
2026-01-17 03:07:16 -08:00
parent efcf14a545
commit 2c34359b2c
11 changed files with 472 additions and 97 deletions
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server/services/transcodeSession.js
+31 -9
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@@ -165,8 +165,9 @@ class TranscodeSession extends EventEmitter {
* Build FFmpeg arguments for HLS output with optional GPU encoding
*/
buildFFmpegArgs() {
const segmentPattern = path.join(this.dir, 'seg%04d.ts');
const segmentPattern = path.join(this.dir, 'seg%04d.m4s');
const encoder = this.options.hwEncoder || 'software';
const videoMode = this.options.videoMode || 'encode';
const args = [
'-hide_banner',
@@ -174,8 +175,10 @@ class TranscodeSession extends EventEmitter {
'-user_agent', this.options.userAgent,
];
// Add hardware acceleration input options based on encoder
this.addHwAccelInputArgs(args, encoder);
// Add hardware acceleration input options based on encoder (only if encoding)
if (videoMode === 'encode') {
this.addHwAccelInputArgs(args, encoder);
}
// Input options (common)
args.push(
@@ -186,7 +189,9 @@ class TranscodeSession extends EventEmitter {
'-reconnect', '1',
'-reconnect_streamed', '1',
'-reconnect_delay_max', '3',
'-seekable', '0'
'-seekable', '0',
// Critical for syncing copied video with transcoded audio if source has non-zero start time
'-copyts'
);
// Add seek offset if specified
@@ -200,14 +205,30 @@ class TranscodeSession extends EventEmitter {
args.push('-map', '0:v:0');
args.push('-map', '0:a:0?');
// Add video encoder and filters based on selected encoder
this.addVideoEncoderArgs(args, encoder);
// Add video encoder and filters based on selected encoder OR copy
if (videoMode === 'copy') {
args.push('-c:v', 'copy');
// Critical for MKV/MP4 -> TS copy: Convert bitstream from AVCC/HVCC to Annex B
if (this.options.videoCodec === 'hevc' || this.options.videoCodec === 'h265') {
args.push('-bsf:v', 'hevc_mp4toannexb');
} else if (this.options.videoCodec === 'h264' || this.options.videoCodec === 'avc') {
args.push('-bsf:v', 'h264_mp4toannexb');
} else {
// Fallback (e.g. unknown codec), try strict extraction
args.push('-bsf:v', 'dump_extra');
}
} else {
this.addVideoEncoderArgs(args, encoder);
}
// Audio: Transcode to AAC
args.push(
'-c:a', 'aac',
'-ar', '48000',
'-b:a', '192k'
'-b:a', '192k',
// Smart Stereo Downmix (NetV Style): Boosts dialogue (FC) and preserves LFE
'-af', 'pan=stereo|FL=FC+0.30*FL+0.30*BL|FR=FC+0.30*FR+0.30*BR,aresample=async=1'
);
// HLS output options
@@ -217,7 +238,7 @@ class TranscodeSession extends EventEmitter {
'-hls_list_size', '0', // Keep all segments in playlist
'-hls_flags', 'independent_segments+append_list',
'-hls_segment_type', 'mpegts',
'-hls_segment_filename', segmentPattern,
'-hls_segment_filename', path.join(this.dir, 'seg%04d.ts'),
this.playlistPath
);
@@ -393,7 +414,8 @@ class TranscodeSession extends EventEmitter {
'-preset', 'veryfast', // Fast for real-time
'-crf', String(crf),
'-profile:v', 'high',
'-level', '4.1'
'-level', '4.1',
'-pix_fmt', 'yuv420p' // Force 8-bit output for compatibility (fixes 10-bit input errors)
);
}