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15th February 2019, 14:03 | #1 | Link |
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1080i50 to 1080p25
Hello everybody,
I have ripped a BluRay (TV-production) which is 1080i50 and I want it to be 1080p25. It was MBAFF encoded. Is this losslessly possible? And can someone please confirm that it is actually interlaced? Example: https://ufile.io/fkphs Code:
Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High@L4.1 Format settings : CABAC / 4 Ref Frames Format settings, CABAC : Yes Format settings, RefFrames : 4 frames Codec ID : V_MPEG4/ISO/AVC Duration : 1 min 0 s Bit rate mode : Variable Maximum bit rate : 33.0 Mb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 25.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : MBAFF Scan type, store method : Interleaved fields Scan order : Top Field First Default : Yes Forced : No Best Felix Last edited by FLX90; 15th February 2019 at 14:11. |
15th February 2019, 14:10 | #2 | Link |
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Why do you have to get rid half of the frames?
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15th February 2019, 14:18 | #4 | Link |
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Indeed. Both fields refer to the same frame. No idea why they keep doing this. After all 1920x1080@25 is blu-ray compatible.
https://en.wikipedia.org/wiki/Blu-ray
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15th February 2019, 14:26 | #5 | Link |
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"Real" 1080p25 encoding is only allowed on UltraHD Blu-Ray with HEVC codec. On "normal" Blu-Ray only 1080i25 is allowed but you can e.g. encode all frames/blocks as progressive (x264 has "fake interlaced" mode for that).
https://forum.doom9.org/showthread.php?t=154533 |
15th February 2019, 14:29 | #6 | Link | ||
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Quote:
Quote:
But maybe because it is originally a TV production. Is it possible to get 1080p25 without the need of a re-encode? |
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15th February 2019, 14:45 | #7 | Link | |
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Quote:
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15th February 2019, 15:49 | #9 | Link | |
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Quote:
Okay thanks, so I will re-encode with x264. |
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15th February 2019, 17:13 | #10 | Link |
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I get this warning
Code:
x264 [warning]: input appears to be interlaced, enabling tff interlaced mode. If you want otherwise, use --no-interlaced or --bff x264 [warning]: interlace + weightp is not implemented Code:
x264-r2935-545de2f.exe --fps 25 --force-cfr --bitrate 22956 --preset veryslow --tune film --bluray-compat --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1 --keyint 25 --open-gop --slices 4 --fake-interlaced --no-interlaced --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1 --pass 1 -o temp.mkv output.mkv x264-r2935-545de2f.exe --fps 25 --force-cfr --bitrate 22956 --preset veryslow --tune film --bluray-compat --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1 --keyint 25 --open-gop --slices 4 --fake-interlaced --no-interlaced --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1 --pass 2 -o temp.mkv output.mkv |
15th February 2019, 18:33 | #11 | Link |
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If you wanted to author a "professional" Blu-Ray (and used .264 output) that would be the correct way.
Will this solve the problem with your picky player? I don't know. The source was probably already Blu-Ray compliant (since it was a commercial Blu-Ray, right?) so maybe your player has a different problem. E.g. the sound or something with the muxing. |
15th February 2019, 23:14 | #12 | Link |
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I suspect that an adequately bored and knowledgeable engineer could do this as a sort of low-level remux. Using MBAFF, each frame should be fully progressive macroblocks. All the predictions will also be progressive. If the data got copied over, leaving out all the "this could be interlaced" flags, I think it would work. CABAC would need to be regenerated. I've not heard of any tools like this, however.
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17th February 2019, 11:38 | #13 | Link | |
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It's not very likely to find official releases encoded that way, but it can happen... |
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14th March 2019, 21:17 | #15 | Link |
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I seem to remember that the early Panasonic (1920x)1080p50 AVCHD camcorders generated encoded 'repeat' (or duplicate) frames instead of actual unique frames. Other manufacturers created p50 encodes using repeat flags...
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15th March 2019, 10:45 | #17 | Link |
Life's clearer in 4K UHD
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This is why it was better to buy a Blu-ray player that supported AVCHD media as well...
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15th March 2019, 13:47 | #18 | Link |
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But even in this case, encoding like --face-interlaced (i.e. not to set the frame_mbs_only and mb_adaptive_frame_field_flag flags in the SPS and to encode every picture as a frame) would be the better option. But probably there was no software to do this and/or the people authoring the Blurays didn't know about this.
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16th March 2019, 17:53 | #20 | Link | |
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Quote:
Last edited by kolak; 17th March 2019 at 12:34. |
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