ffprobe -v error -show_entries stream=index,codec_name,codec_type,width,height,r_frame_rate -of default=noprint_wrappers=1 sample.mjpeg
: Contains mp4-mjpeg examples for web development testing. mjpeg video sample verified
| Symptom | Most Likely Cause | Verification Command | |---------|------------------|----------------------| | First frame OK, rest static | Stream stopped updating; repeated same frame | ffmpeg -i sample.mjpeg -vf "select='eq(n,0)+eq(n,10)',showinfo" | | Green/pink artifacts | Missing or corrupted DHT/DQT markers | ffmpeg -i sample.mjpeg -f null - (look for invalid Huffman code ) | | Video plays fast/slow | Incorrect framerate assumption | Check original source (no fix; re-encode with -r ) | | Frames 1–1000 OK, rest lost | Network truncation | ls -l sample.mjpeg vs expected size | | Player crashes | FF D9 inside compressed data (false EOI) | Script-based parser (Section 4.2) | | | Checksum / Hash | Cryptographic hash
| Verification Aspect | What It Checks | |---------------------|----------------| | | Start-of-Image (SOI - 0xFFD8) and End-of-Image (EOI - 0xFFD9) markers exist for each frame. | | Frame Count Accuracy | The declared number of frames matches the actual parsed frames. | | Checksum / Hash | Cryptographic hash (MD5, SHA-256) matches the original source or a reference. | | Decode-ability | Every JPEG frame can be decoded without fatal errors (e.g., via libjpeg or FFmpeg). | | Color & Artifact Check | No green banding, purple edges, or macro blocking (common corruption signs). | | Timestamp Continuity | For streams: PTS/DTS values are sequential and logical. | | File Format Compliance | If wrapped in AVI, MOV, or MKV – the container metadata is consistent with the MJPEG essence. | | | Timestamp Continuity | For streams: PTS/DTS