um dos truques que se usa é este
mas é martelenço quase todos os mkv que tenho são com o profile l5.1
This thread is a spin-off of
some posts regarding how to get MKV files encoded with x264 to work with hardware acceleration (a/k/a DirectX Video Acceleration, or DXVA) on ATI HD2000, HD3000 and NVIDIA 8000 video cards.
The following settings will ensure hardware compatibility with players like the PS3, and also allow smooth DXVA playback on ATI and NVIDIA graphics cards when using the Cyberlink H.264 decoder included with PowerDVD 7.
The settings have been tested to work with PowerDVD, ZoomPlayer, Media Player Classic - Home Cinema, using the Haali Splitter or the Nero Digital Parser, and using the Overlay Mixer, VMR7, and VMR9 Windowless/Renderless video renderers.
The Bottom Line
Everybody should be encoding HD content (1080p, 720p) to Profile High @ Level 4.1. For smooth playback, "--level 4.1" should be used to mark the file as compatible when encoding. The best x264 profile is the MeGUI PD-PS3 profile, with B-pyramid disabled.
The PS3 profile options, sans B-Pyramid:
--level 4.1 --ref 3 --mixed-refs --bframes 3 --b-rdo --bime --weightb --direct auto --subme 6 --trellis 1 --analyse p8x8,b8x8,i4x4,i8x8 --8x8dct --vbv-maxrate 25000 --me umh --merange 12
Everybody should be encoding SD content (576p, 480p, or less) to Profile High @ Level 3.1 For smooth playback, "--level 3.1" should be used to mark the file as compatible when encoding. The best x264 profile is the MeGUI PD-PS3 profile, with B-pyramid disabled, and the level set to 3.1.
The PS3 profile options, sans B-Pyramid with L3.1:
--level 3.1 --ref 3 --mixed-refs --bframes 3 --b-rdo --bime --weightb --direct auto --subme 6 --trellis 1 --analyse p8x8,b8x8,i4x4,i8x8 --8x8dct --vbv-maxrate 25000 --me umh --merange 12
The Details
The associations responsible for the HD DVD and Blu-ray Disc standards decided the approved H.264 profile/level would be
[email protected] for HD content, and so the hardware decoder manufacturers have built to that specification. The hardware decoder manufacturers have also decided the approved H.264 profile/level would be
[email protected] for SD content.
That has resulted in two implications:
1. H.264 video must comply with the L4.1 and L3.1 limitations for the Decoded Picture Buffer (DPB) size, which limits the video resolution and number of reference frames.
2. H.264 streams must declare L4.1 or L3.1 in the "level_idc" flag (set by --level with x264) in order to achieve smooth DXVA playback.
The Settings
Keep in mind that, no matter the resolution, it is still generally recommended to only use between 1-5 reference frames, usually centering on 3.
A patch was added in
x264 revision 721 that changes the way --ref works, allowing it to specify the total Decoded Picture Buffer (DPB) size. Now, B-frames and B-Pyramids can be used without the DPB size exceeding the --ref value, though B-Pyramids still cause corruption with DXVA.
The DPB size is the max at the given resolution, so if your resolution is between the resolutions given, use the lower DPB size (i.e., 1920x816 is between 1920x720 and 1920x864, so you can have a max DPB of 5).
Resolution: Max DPB Size (x264 revision 721+ encoder settings)
L4.1
1920x1088: 4 (--ref 4)
1920x864: 5 (--ref 5)
1920x720: 6 (--ref 6)
L4.1
1280x720: 9 (--ref 9)
1280x648: 10 (--ref 10)
1280x588: 11 (--ref 11)
1280x540: 12 (--ref 12)
1280x498: 13 (--ref 13)
1280x462: 14 (--ref 14)
1280x432: 15 (--ref 15)
1280x405: 16 (--ref 16)
L3.1
720x(any): 8 (--ref 8)
720x576: 11 (--ref 11)
720x480: 13 (--ref 13)
Resolution: Max DPB Size (x264 revision < 721 encoder settings, bframes+b-pyramid count towards DPB size)
L4.1
1920x1088: 4 (--ref 3 --bframes 3 --no-b-pyramid)
1920x864: 5 (--ref 4 --bframes 3 --no-b-pyramid)
1920x720: 6 (--ref 5 --bframes 3 --no-b-pyramid)
L4.1
1280x720: 9 (--ref 8 --bframes 3 --no-b-pyramid)
1280x648: 10 (--ref 9 --bframes 3 --no-b-pyramid)
1280x588: 11 (--ref 10 --bframes 3 --no-b-pyramid)
1280x540: 12 (--ref 11 --bframes 3 --no-b-pyramid)
1280x498: 13 (--ref 12 --bframes 3 --no-b-pyramid)
1280x462: 14 (--ref 13 --bframes 3 --no-b-pyramid)
1280x432: 15 (--ref 14 --bframes 3 --no-b-pyramid)
1280x405: 16 (--ref 15 --bframes 3 --no-b-pyramid)
L3.1
720x(any): 8 (--ref 10 --bframes 3 --no-b-pyramid)
720x576: 11 (--ref 10 --bframes 3 --no-b-pyramid)
720x480: 13 (--ref 12 --bframes 3 --no-b-pyramid)
Retrofitting MKVs or other H.264 videos
Existing MKV, MP4, TS or AVI files that work with DXVA, but do not play back smoothly, can have their level_idc value changed, if the H.264 video stream
actually complies with Profile
[email protected] (HD) or L3.1 (SD).
Courtesy of DJBlu, you can use
his utility to directly change the level_idc flag for MKV files 720p and less.
To manually change your files, or for files >720p, continue on.
This process is for MKV files and has been adapted from
a process originally described by DJBlu.
Download the following programs:
MKVtoolnix
MKVExtractGUI
H264info
Optional:
AVInaptic
Extract MKVtoolnix into a folder.
Extract MKVExtractGUI into the
same folder.
Extract H264info into another folder (can be the same folder).
Optional: Extract AVInaptic into another folder (can be the same folder).
Open your MKV with MKVExtractGUI. Check Options menu > Tabs > TimeCode. Check the boxes for all the video, audio, and subtitle tracks you want to keep and click Extract.
Once all are extracted, you will have separate files for your video, audio and subtitle tracks, plus TimeCode_TrackX.txt files for each track.
Open H264info.
Set Input = Extracted .h264 file
Set Output = new_file_name.h264
In the "Level (1 - 5.1)" box, enter 4.1 for an HD stream, or 3.1 for an SD stream.
Click Start and wait for the stream to be fixed.
Open the MKVtoolnix mkvmerge GUI (mmg.exe).
Click add and select the new_file_name.h264 file created by H264info.
Click add and select a file for each audio and subtitle track you need to add.
In the Tracks box, click on the "MPEG-4 part 10 ES" video track.
At the far right of the Timecodes box at the bottom of the window, click Browse and select the TimeCode_TrackX.txt file for your video track (probably Track1).
Click the "Format specific options" tab.
In the FPS box, enter the frames per second of your original MKV file. If you don't know the framerate, you can use the AVInaptic tool to open the original MKV file to get all manner of information, including the FPS. If your video is FILM content, the likely choice is "24000/1001". If your video is progressive NTSC VIDEO, the likely choice is "60000/1001". If your video is interlaced NTSC VIDEO, the likely choice is "30000/1001". If your video is PAL VIDEO, the likely choice is "25".
Click on your audio track in the Tracks box.
Click on the "General track options" tab.
At the far right of the Timecodes box at the bottom of the window, click Browse and select the TimeCode_TrackX.txt file for your audio track (probably Track2). Do the same for any subsequent tracks.
Create an "Output filename" in the box at the far bottom of the window and click "Start muxing".
Wait for the new MKV to be remuxed and you should have an MKV file with smooth DXVA playback.
