Recherche avancée

Sur d’autres sites (5443)

• ffmpeg ignores set bitrate

  13 mars 2023, par col__panic

  I have a folder of h264 files I am trying to convert to hevc with a lower bitrate set with -b:v flag. For context I am using python running in a Docker container. The issue is that when ffmpeg completes, the output bitrate is extremely low.

  


  As you can see from the ffmpeg command below, I am expecting around 900k bitrate. But as the command runs, it shows around 18k bitrate.

  


  ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i /tmp/input.ts -an -c:v hevc_nvenc -b:v 914k -b_ref_mode 0 -tag:v hvc1 /tmp/output.mp4 
ffmpeg version N-109685-gac37b2c2b1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: --enable-nonfree --enable-cuda-nvcc --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64
  libavutil      57. 44.100 / 57. 44.100
  libavcodec     59. 58.100 / 59. 58.100
  libavformat    59. 36.100 / 59. 36.100
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 54.100 /  8. 54.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
-vsync is deprecated. Use -fps_mode
Passing a number to -vsync is deprecated, use a string argument as described in the manual.
Input #0, mpegts, from '/tmp/input.ts':
  Duration: 01:04:53.85, start: 85937.219044, bitrate: 2613 kb/s
  Program 1 
  Stream #0:0[0x101]: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720, 90k tbr, 90k tbn
  Stream #0:1[0x202]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 130 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> hevc (hevc_nvenc))
Press [q] to stop, [?] for help
Output #0, mp4, to '/tmp/output.mp4':
  Metadata:
    encoder         : Lavf59.36.100
  Stream #0:0: Video: hevc (Main) (hvc1 / 0x31637668), cuda(progressive), 1280x720, q=2-31, 914 kb/s, 90k fps, 90k tbn
    Metadata:
      encoder         : Lavc59.58.100 hevc_nvenc
    Side data:
      cpb: bitrate max/min/avg: 0/0/914000 buffer size: 1828000 vbv_delay: N/A
frame=113118 fps=412 q=49.0 Lsize=    8925kB time=01:04:53.82 bitrate=  18.8kbits/s speed=14.2x    
video:8215kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 8.636624%


  


  And then checking the output shows that it is around 18kb/s.

  


  ffmpeg -i /tmp/output.mp4 
...
  Duration: 01:04:53.82, start: 0.000000, bitrate: 18 kb/s


  


  For reference the input file is 2600kb/s.

  


  ffmpeg -i /tmp/input.ts 
...
  Duration: 01:04:53.85, start: 85937.219044, bitrate: 2613 kb/s



  


  This seems like an issue with the file itself, given that I have run the same command and had it work. Also note that even when I leave out the -b:v flag, the output is about the same.

  


  I have tried setting -minrate:v -maxrate:v -bufsize:v and -ss 00:00:00 flags as well and they did not help.

  


  Also there was another post that mentioned the audio track being an issue and to rule that out, I tried using -an and that didn't help either.

  


  I saw another post that mentioned the order of the parameters being an issue but I don't think that's the issue because this same command has run successfully on other input files.

  


  Any ideas ?

  


  EDIT :
nvm fixed it

  


• avutil : remove deprecated FF_API_INTERLACED_FRAME

  19 février, par James Almer

  avutil : remove deprecated FF_API_INTERLACED_FRAME
  Deprecated since 2023-05-04.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/decode.c
  • [DH] libavcodec/encode.c
  • [DH] libavfilter/buffersrc.c
  • [DH] libavfilter/qsvvpp.c
  • [DH] libavfilter/vf_coreimage.m
  • [DH] libavfilter/vf_deinterlace_vaapi.c
  • [DH] libavfilter/vf_estdif.c
  • [DH] libavfilter/vf_field.c
  • [DH] libavfilter/vf_fieldhint.c
  • [DH] libavfilter/vf_fieldmatch.c
  • [DH] libavfilter/vf_fieldorder.c
  • [DH] libavfilter/vf_idet.c
  • [DH] libavfilter/vf_kerndeint.c
  • [DH] libavfilter/vf_nnedi.c
  • [DH] libavfilter/vf_separatefields.c
  • [DH] libavfilter/vf_setparams.c
  • [DH] libavfilter/vf_telecine.c
  • [DH] libavfilter/vf_tinterlace.c
  • [DH] libavfilter/vf_w3fdif.c
  • [DH] libavfilter/vf_weave.c
  • [DH] libavfilter/vsrc_gradients.c
  • [DH] libavfilter/vsrc_testsrc.c
  • [DH] libavfilter/yadif_common.c
  • [DH] libavutil/frame.c
  • [DH] libavutil/frame.h
  • [DH] libavutil/version.h

• avutil : remove deprecated FF_API_PALETTE_HAS_CHANGED

  19 février, par James Almer

  avutil : remove deprecated FF_API_PALETTE_HAS_CHANGED
  Deprecated since 2023-05-18.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/8bps.c
  • [DH] libavcodec/ansi.c
  • [DH] libavcodec/bethsoftvideo.c
  • [DH] libavcodec/bfi.c
  • [DH] libavcodec/bintext.c
  • [DH] libavcodec/bmvvideo.c
  • [DH] libavcodec/brenderpix.c
  • [DH] libavcodec/c93.c
  • [DH] libavcodec/cdgraphics.c
  • [DH] libavcodec/cdtoons.c
  • [DH] libavcodec/cinepak.c
  • [DH] libavcodec/dds.c
  • [DH] libavcodec/dfa.c
  • [DH] libavcodec/dsicinvideo.c
  • [DH] libavcodec/dxa.c
  • [DH] libavcodec/flicvideo.c
  • [DH] libavcodec/gemdec.c
  • [DH] libavcodec/idcinvideo.c
  • [DH] libavcodec/imx.c
  • [DH] libavcodec/interplayvideo.c
  • [DH] libavcodec/jvdec.c
  • [DH] libavcodec/kmvc.c
  • [DH] libavcodec/mscc.c
  • [DH] libavcodec/msrle.c
  • [DH] libavcodec/mss1.c
  • [DH] libavcodec/msvideo1.c
  • [DH] libavcodec/pafvideo.c
  • [DH] libavcodec/pictordec.c
  • [DH] libavcodec/psd.c
  • [DH] libavcodec/qdrw.c
  • [DH] libavcodec/qpeg.c
  • [DH] libavcodec/qtrle.c
  • [DH] libavcodec/rawdec.c
  • [DH] libavcodec/rscc.c
  • [DH] libavcodec/sga.c
  • [DH] libavcodec/smacker.c
  • [DH] libavcodec/smc.c
  • [DH] libavcodec/targa.c
  • [DH] libavcodec/tiertexseqv.c
  • [DH] libavcodec/tmv.c
  • [DH] libavcodec/tscc.c
  • [DH] libavcodec/vb.c
  • [DH] libavcodec/vqavideo.c
  • [DH] libavcodec/yop.c
  • [DH] libavutil/frame.c
  • [DH] libavutil/frame.h
  • [DH] libavutil/version.h