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• ffmpeg ignores -metadata option when video is encoded

  30 octobre 2018, par Rafael Lima

  I have a video with the following metadata:

  rotate : 90
  

  I'm using ffmpeg (4.0 binaries from windows downloaded from official website) to encode it and I want to delete this metadata information.

  If I do:
  ffmpeg -i input.mp4 -c copy -metadata:s:v:0 rotate= output.mp4
  the output will have removed the metadata.

  But if I do:
  ffmpeg -i input.mp4 -c:v libx264 -metadata:s:v:0 rotate= output.mp4
  then I still have the undesired metadata.

  Is there a way to remove metadata while encoding?

• ffpmeg drops last frame when compressing from MP4 to MP4 (libx264)

  28 octobre 2018, par Usoboi

  So, I'm using this code to compress my *mp4 file. I need to get lower quality and decrease bitrate:

  ffmpeg -i input.mp4 -c:v libx264 output.mp4
  

  The problem is: the last frame of footage is dropped after ffmpeg compression. Screenshot is here: screenshot_ffmpeg_drop frame

  I tried to use full preferences I need, but the problem is the same.

  ffmpeg -i input.mp4 -c:v libx264 -vf scale=1280:720 -preset fast -crf 29 -r 25 -c:a copy output.mp4
  

  logfile during ffmpeg encoding:

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '\input.mp4': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42mp41 creation_time : 2018-10-28T11:06:03.000000Z Duration: 00:00:12.76, start: 0.000000, bitrate: 5374 kb/s Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 5368 kb/s, 25 fps, 25 tbr, 50k tbn, 50 tbc (default) Metadata: creation_time : 2018-10-28T11:06:03.000000Z handler_name : Alias Data Handler encoder : AVC Coding

  Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264)) Press [q] to stop, [?] for help [libx264 @ 000002fae8b50780] using SAR=1/1 [libx264 @ 000002fae8b50780] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 [libx264 @ 000002fae8b50780] profile High, level 3.1 [libx264 @ 000002fae8b50780] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=crf mbtree=1 crf=29.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to '\output.mp4': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42mp41 encoder : Lavf58.17.100 Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default) Metadata: creation_time : 2018-10-28T11:06:03.000000Z handler_name : Alias Data Handler encoder : Lavc58.19.104 libx264 Side data: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1

  frame= 318 fps=127 q=-1.0 Lsize= 855kB time=00:00:12.60 bitrate= 556.0kbits/s speed=5.05x video:851kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.534683% [libx264 @ 0000015d5cef0500] frame I:2 Avg QP:26.18 size: 67800 [libx264 @ 0000015d5cef0500] frame P:80 Avg QP:27.93 size: 5439 [libx264 @ 0000015d5cef0500] frame B:236 Avg QP:32.44 size: 1269 [libx264 @ 0000015d5cef0500] consecutive B-frames: 0.9% 0.0% 0.9% 98.1% [libx264 @ 0000015d5cef0500] mb I I16..4: 10.6% 62.5% 26.8% [libx264 @ 0000015d5cef0500] mb P I16..4: 0.5% 1.0% 0.2% P16..4: 36.1% 5.1% 3.6% 0.0% 0.0% skip:53.6% [libx264 @ 0000015d5cef0500] mb B I16..4: 0.6% 0.5% 0.0% B16..8: 22.2% 0.6% 0.0% direct: 2.0% skip:74.2% L0:44.9% L1:54.5% BI: 0.6% [libx264 @ 0000015d5cef0500] 8x8 transform intra:55.0% inter:86.2% [libx264 @ 0000015d5cef0500] coded y,uvDC,uvAC intra: 48.1% 54.9% 27.0% inter: 3.2% 5.2% 0.2% [libx264 @ 0000015d5cef0500] i16 v,h,dc,p: 19% 56% 10% 15% [libx264 @ 0000015d5cef0500] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 25% 18% 5% 6% 5% 8% 5% 8% [libx264 @ 0000015d5cef0500] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 24% 9% 5% 8% 7% 9% 5% 7% [libx264 @ 0000015d5cef0500] i8c dc,h,v,p: 60% 20% 15% 4% [libx264 @ 0000015d5cef0500] Weighted P-Frames: Y:0.0% UV:0.0% [libx264 @ 0000015d5cef0500] ref P L0: 67.7% 32.3% [libx264 @ 0000015d5cef0500] ref B L0: 80.4% 19.6% [libx264 @ 0000015d5cef0500] ref B L1: 92.1% 7.9% [libx264 @ 0000015d5cef0500] kb/s:547.35

• How to use commercial libx264 with GStreamer ? [closed]

  23 octobre 2018, par Vlad.Z

  I need to produce an x264 video stream with my product using GStreamer framework, and I am going to get a commercial x264 license for that. But now the question is how to actually plug the commercial x264 into GStreamer, because the x264enc element is under GPL. Anyone has experience with this? Thanks.

• How can I set x.264 lambda parameter ? [closed]

  5 octobre 2018, par Atrin

  I'm wondering how I can change lambda parameter in x.264? that would be great if I can have a sample command to do that.

• x264 options for colorprim

  25 septembre 2018, par Kumar Swaminathan

  I have a source with the following color characteristics (as determined by ffprobe using "ffprobe -v error -show_format -show_streams source") colormatrix=smpte170m:colorprim=reserved:transfer=reserved.

  I would like to preserve this and so I encoded with ffmpeg with libx264 by specifying the following x264 specific options:

  "-vcodec libx264 -profile:v baseline -level 3.1 -b:v 2400k -preset medium -x264opts ref=3:keyint=90:colormatrix=smpte170m:colorprim=reserved:transfer=reserved -r 30000/1001"

  But now I get an error =>

  [libx264 @ 0x2234820] bad value for 'colorprim': 'reserved'

  Error initializing output stream 0:1 -- Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  What should the ideal mapping here be to preserve the input color characteristics ?