- Implemented.
Safari/iPhone recording now uses MP4/AAC when WebM is unavailable. WebM remains the default when supported and FFmpeg is disabled. Added optional FFmpeg profiles: recommended M4A/AAC-LC or requested MP4/H.264 + AAC. Added MIME-aware, playsinline audio playback. Added dashboard controls under Plans & Platform → Voice Transcoding / FFmpeg. Added Apache/Nginx media MIME configuration and documentation. Core implementation: voice_transcoder.php (line 72), messages.php (line 86), and cyberchat-app.js (line 635).
This commit is contained in:
Ty Clifford
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<?php
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function voiceTranscodingProfile(): string {
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$profile = (string)getConfigVal('voice.transcoding.profile', 'm4a_aac');
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return in_array($profile, ['m4a_aac', 'mp4_h264_aac'], true) ? $profile : 'm4a_aac';
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}
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function voiceFfmpegBinary(): string {
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$binary = trim((string)getConfigVal('voice.transcoding.ffmpeg_path', 'ffmpeg'));
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if ($binary === '' || preg_match('/[\x00-\x1F\x7F]/', $binary)) {
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throw new RuntimeException('The FFmpeg binary path is invalid.');
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}
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return $binary;
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}
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function runVoiceTranscodeCommand(array $command, int $timeoutSeconds): array {
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if (!function_exists('proc_open')) {
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return ['exit_code' => 127, 'stderr' => 'PHP proc_open is unavailable.'];
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}
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$process = @proc_open($command, [
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0 => ['pipe', 'r'],
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1 => ['pipe', 'w'],
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2 => ['pipe', 'w'],
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], $pipes, null, null, ['bypass_shell' => true]);
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if (!is_resource($process)) {
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return ['exit_code' => 127, 'stderr' => 'FFmpeg could not be started.'];
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}
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fclose($pipes[0]);
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stream_set_blocking($pipes[1], false);
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stream_set_blocking($pipes[2], false);
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$stdout = '';
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$stderr = '';
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$started = microtime(true);
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$exitCode = -1;
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while (true) {
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$stdout .= (string)stream_get_contents($pipes[1]);
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$stderr .= (string)stream_get_contents($pipes[2]);
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$status = proc_get_status($process);
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if (!$status['running']) {
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$exitCode = (int)$status['exitcode'];
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break;
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}
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if ((microtime(true) - $started) >= $timeoutSeconds) {
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proc_terminate($process);
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usleep(100000);
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$status = proc_get_status($process);
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if ($status['running']) proc_terminate($process, 9);
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$exitCode = 124;
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$stderr .= "\nFFmpeg timed out.";
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break;
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}
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usleep(50000);
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}
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$stdout .= (string)stream_get_contents($pipes[1]);
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$stderr .= (string)stream_get_contents($pipes[2]);
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fclose($pipes[1]);
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fclose($pipes[2]);
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$closeCode = proc_close($process);
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if ($exitCode < 0) $exitCode = $closeCode;
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return [
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'exit_code' => $exitCode,
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'stdout' => substr($stdout, -4000),
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'stderr' => substr($stderr, -4000),
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];
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}
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function transcodeVoiceRecording(
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string $sourcePath,
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string $sourceFilename,
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string $sourceMime
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): array {
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if (!getConfigVal('voice.transcoding.enabled', false)) {
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return ['filename' => $sourceFilename, 'mime' => $sourceMime, 'transcoded' => false];
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}
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$profile = voiceTranscodingProfile();
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$bitrate = max(48, min(320, (int)getConfigVal('voice.transcoding.audio_bitrate_kbps', 128)));
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$timeout = max(5, min(300, (int)getConfigVal('voice.transcoding.timeout_seconds', 45)));
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$fallback = (bool)getConfigVal('voice.transcoding.fallback_to_source', true);
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$token = pathinfo($sourceFilename, PATHINFO_FILENAME);
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if (!preg_match('/^[a-f0-9]{40}$/', $token)) {
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throw new RuntimeException('Voice recording filename is invalid.');
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}
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$extension = $profile === 'mp4_h264_aac' ? 'mp4' : 'm4a';
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$outputMime = $profile === 'mp4_h264_aac' ? 'video/mp4' : 'audio/mp4';
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$outputFilename = $token . '.' . $extension;
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$outputPath = dirname($sourcePath) . '/' . $outputFilename;
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$temporaryPath = dirname($sourcePath) . '/.' . $token . '.tmp.' . $extension;
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$binary = voiceFfmpegBinary();
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if ($profile === 'mp4_h264_aac') {
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$command = [
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$binary, '-nostdin', '-hide_banner', '-loglevel', 'error', '-y',
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'-f', 'lavfi', '-i', 'color=c=black:s=16x16:r=1',
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'-i', $sourcePath,
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'-map', '0:v:0', '-map', '1:a:0', '-shortest',
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'-c:v', 'libx264', '-preset', 'veryfast', '-tune', 'stillimage',
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'-profile:v', 'baseline', '-level', '3.0', '-pix_fmt', 'yuv420p',
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'-c:a', 'aac', '-profile:a', 'aac_low', '-b:a', $bitrate . 'k',
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'-map_metadata', '-1', '-movflags', '+faststart', $temporaryPath,
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];
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} else {
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$command = [
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$binary, '-nostdin', '-hide_banner', '-loglevel', 'error', '-y',
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'-i', $sourcePath, '-vn',
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'-c:a', 'aac', '-profile:a', 'aac_low', '-b:a', $bitrate . 'k',
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'-map_metadata', '-1', '-movflags', '+faststart', $temporaryPath,
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];
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}
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$result = runVoiceTranscodeCommand($command, $timeout);
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$validOutput = $result['exit_code'] === 0
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&& is_file($temporaryPath)
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&& filesize($temporaryPath) > 0;
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if (!$validOutput) {
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if (is_file($temporaryPath)) @unlink($temporaryPath);
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$detail = trim((string)($result['stderr'] ?? ''));
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error_log('Voice transcoding failed: ' . ($detail !== '' ? $detail : 'unknown FFmpeg error'));
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if ($fallback) {
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return ['filename' => $sourceFilename, 'mime' => $sourceMime, 'transcoded' => false];
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}
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throw new RuntimeException('Voice transcoding failed. Check the FFmpeg dashboard settings.');
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}
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$sourceBackupPath = null;
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if ($outputPath === $sourcePath) {
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$sourceBackupPath = dirname($sourcePath) . '/.' . $token . '.source.' . $extension;
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if (!@rename($sourcePath, $sourceBackupPath)) {
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@unlink($temporaryPath);
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if ($fallback) {
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return ['filename' => $sourceFilename, 'mime' => $sourceMime, 'transcoded' => false];
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}
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throw new RuntimeException('The original voice clip could not be prepared for replacement.');
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}
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}
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if (!@rename($temporaryPath, $outputPath)) {
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@unlink($temporaryPath);
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if ($sourceBackupPath !== null && is_file($sourceBackupPath)) {
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@rename($sourceBackupPath, $sourcePath);
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}
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if ($fallback && is_file($sourcePath)) {
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return ['filename' => $sourceFilename, 'mime' => $sourceMime, 'transcoded' => false];
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}
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throw new RuntimeException('The transcoded voice clip could not be stored.');
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}
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if ($sourceBackupPath !== null) {
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@unlink($sourceBackupPath);
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} else {
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@unlink($sourcePath);
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}
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return ['filename' => $outputFilename, 'mime' => $outputMime, 'transcoded' => true];
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}
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