I have a 720p m4v file that looks quite good and plays smoothly. However, seeking is sluggish and I cannot make frame accurate cuts using VideoReDo TVSuite V5. Normally I have no problem using VideoReDo with h.264 video. AviDemux gives similar issues. It will only cut a certain points which I assume are at GOP boundaries and from the look of things given the way those boundaries jump in AVIDemux the boundaries are far apart. As best I understand VideoReDo should be able to cut at any point by re-encoding frames up to the boundary and then copying without encoding the remainder. This appears to be happening but the resultant file will not play smoothly at all. Sometimes frames are skipped at the beginning or end of cuts.
I don't know what it is about the encoding of this file that is giving this problem. I would like to re-encode this file so that cutting will be accurate. I would be grateful for any setting in either VideoReDo or AVIDemux to facilitate this.
Thanks!
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Unfortunately we cannot see all the the details in your screenshot. It's better to set MediaInfo to "View"->"Text" and copy&paste everything here. In the "Encoding settings" look if it shows "open_gop=1". Many softwares do not properly support OpenGOP. That might include the mp4(m4v) muxer you have been using. So demuxing and muxing again with a good muxer might fix issues. Maybe VideoReDo doesn't support this properly either (I do not know).
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sneaker, Thanks for your assistance! I see open_gop=0 Is your recommendation the same (try remuxing)? Thanks!
General
Complete name : F:\RT.m4v
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (isom/iso2/avc1/mp41)
File size : 9.40 GiB
Duration : 6 h 59 min
Overall bit rate mode : Variable
Overall bit rate : 3 203 kb/s
Encoded date : UTC 2018-01-08 07:59:49
Tagged date : UTC 2018-01-08 07:59:49
Writing application : HandBrake 0.10.5 2016021100
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings, CABAC : Yes
Format settings, ReFrames : 9 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 6 h 59 min
Source duration : 6 h 59 min
Bit rate : 3 071 kb/s
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.111
Stream size : 9.01 GiB (96%)
Source stream size : 9.01 GiB (96%)
Writing library : x264 core 142 r2479 dd79a61
Encoding settings : cabac=1 / ref=9 / deblock=1:-3:-3 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=6 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=300 / keyint_min=30 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=crf / mbtree=1 / crf=19.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Encoded date : UTC 2018-01-08 07:59:49
Tagged date : UTC 2018-01-08 07:59:49
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Menus : 3 -
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My goal is not to edit this large file. I want to cut out about 45 min, then cut into smaller sections. It is the smaller cuts that are inaccurate and that will play choppy after cutting with VRD. I suspect that the I frames are too far apart.
I did remux the file with mp4muxer but this made no change at all. I should probably re-encode the file but I'm unsure what settings to try particularly with respect to GOP size which I am guessing could be made smaller. -
I'm not familiar with that. Try something like:
Code:mp4box -raw 1 "input.mp4" mp4box -raw 2 "input.mp4" mp4box -add "input_track1.h264" -add "input_track2.aac" -new "remux.mp4"
Code:mkvmerge -o "remux.mkv" "input_track1.h264" "input_track2.acc"
Either way this is only a test. I don't know what the problem is in this case. -
Sorry, Sneaker, I didn't see your post. I'll try your suggestion. I did manage a solution through VideoReDo by forcing a GOP size to 32 during a re-encode. I think this original video has a very large GOP though I'm not sure how one finds out this information. Or, maybe the issue is with open Gop as you suggested in your first post.
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