Frontend: removed the forced MIME type from the Video.js sources object so it can correctly handle non-mp4 “regular” streams.

File: video-remote/src/components/VideoModal.tsx
Backend: updated /videos/{file_id}/stream-transcoded so that when a Range request is present, it computes an approximate duration_sec from the requested byte length and bitrate, and passes that to ffmpeg (so the response length aligns with Content-Length).

File: media-api/main.py

media-api/main.py

@@ -746,18 +746,21 @@ def stream_transcoded(request: Request, file_id: str, start_time: float = 0.0):
                 time_start_sec = (byte_start / estimated_total_bytes) * video_duration
                 time_start_sec = max(0.0, min(time_start_sec, video_duration - 0.5))
                 
-                # For seeking, don't limit duration - stream to end
-                # The browser will handle buffering
-                duration_sec = None  # None means stream to end
-                
                 # Update headers for range response
                 # For seeking, we typically don't know the exact end, so estimate
                 actual_byte_end = min(byte_end or estimated_total_bytes - 1, estimated_total_bytes - 1)
                 headers["Content-Range"] = f"bytes {byte_start}-{actual_byte_end}/{estimated_total_bytes}"
                 headers["Content-Length"] = str(actual_byte_end - byte_start + 1)
 
+                # Honor the requested range: approximate duration based on bitrate so the
+                # transcoded response length matches the declared Content-Length.
+                requested_bytes = actual_byte_end - byte_start + 1
+                duration_sec = requested_bytes * 8 / transcoded_bitrate if transcoded_bitrate else None
+                if duration_sec is not None:
+                    # Clamp to remaining duration.
+                    duration_sec = max(0.0, min(duration_sec, video_duration - time_start_sec))
+                
                 # Stream from the calculated time position using FFmpeg's -ss flag
-                # Duration is None, so it will stream to the end
                 return StreamingResponse(
                     generate_transcoded_stream(p, time_start_sec, duration_sec),
                     media_type=content_type,

video-remote/src/components/VideoModal.tsx

@@ -52,7 +52,10 @@ export const VideoModal: React.FC<Props> = ({ fileId, onClose }) => {
       sources: [
         {
           src: src,
-          type: 'video/mp4'
+          // Do not hardcode the MIME type: the "regular" endpoint may serve
+          // non-mp4 containers (avi/mkv/etc), and forcing mp4 can trigger
+          // MEDIA_ERR_SRC_NOT_SUPPORTED in Video.js/browser.
+          // Let Video.js/browser sniff based on the actual response.
         }
       ]
     })