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• Transcoding/ Converting mpeg to h264 using ffmpeg h264_nvenc

  15 septembre 2024, par Mustafa

  I'm trying to transcode a video rendered by Davinci Resolve, using ffmpeg from mpeg4 to h264, on Ubuntu, using the following command.

  


  ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i input.mov -c:a copy -c:v h264_nvenc -b:v 8M -preset 7 output-h264_nvenc-p7.mp4 -v verbose


  


  And my Nvidia card is NVIDIA GeForce GTX 1650.

  


  I'm gettting the following error :

  


  [mpeg4 @ 0x55a893ed3200] Video width 3840 not within range from 48 to 2032
[mpeg4 @ 0x55a893ed3200] Failed setup for format cuda: hwaccel initialisation returned error.


  


  And here's the complete output. The command produces an output but its quality is significantly less than the original.

  


    built with gcc 13 (Ubuntu 13.2.0-23ubuntu4)
  configuration: --enable-nonfree --enable-cuda-nvcc --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 --disable-static --enable-shared --enable-gpl --enable-libx264
  libavutil      59. 36.100 / 59. 36.100
  libavcodec     61. 13.100 / 61. 13.100
  libavformat    61.  5.101 / 61.  5.101
  libavdevice    61.  2.101 / 61.  2.101
  libavfilter    10.  2.102 / 10.  2.102
  libswscale      8.  2.100 /  8.  2.100
  libswresample   5.  2.100 /  5.  2.100
  libpostproc    58.  2.100 / 58.  2.100
-vsync is deprecated. Use -fps_mode
Passing a number to -vsync is deprecated, use a string argument as described in the manual.
Selecting decoder 'mpeg4' because of requested hwaccel method cuda
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 512
    compatible_brands: qt  
    creation_time   : 2024-09-15T04:25:29.000000Z
    encoder         : Blackmagic Design DaVinci Resolve
  Duration: 00:20:34.87, start: 0.000000, bitrate: 347243 kb/s
  Stream #0:0[0x1]: Video: mpeg4 (Simple Profile), 1 reference frame (mp4v / 0x7634706D), yuv420p(bt709/bt709/unknown, left), 3840x2160 [SAR 1:1 DAR 16:9], 345703 kb/s, 60 fps, 60 tbr, 15360 tbn (default)
      Metadata:
        creation_time   : 2024-09-15T04:25:29.000000Z
        handler_name    : VideoHandler
        vendor_id       :     
        encoder         : MPEG4 Video
        timecode        : 01:00:00:00
  Stream #0:1[0x2]: Audio: pcm_s16le (lpcm / 0x6D63706C), 48000 Hz, stereo, s16, 1536 kb/s (default)
      Metadata:
        creation_time   : 2024-09-15T04:25:29.000000Z
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](eng): Data: none (tmcd / 0x64636D74) (default)
      Metadata:
        creation_time   : 2024-09-15T04:25:29.000000Z
        handler_name    : TimeCodeHandler
        timecode        : 01:00:00:00
[out#0/mp4 @ 0x55a8929e8d80] No explicit maps, mapping streams automatically...
[vost#0:0/h264_nvenc @ 0x55a8929f5880] Created video stream from input stream 0:0
[aost#0:1/copy @ 0x55a893867080] Created audio stream from input stream 0:1
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (h264_nvenc))
  Stream #0:1 -> #0:1 (copy)
[vost#0:0/h264_nvenc @ 0x55a8929f5880] Starting thread...
[vf#0:0 @ 0x55a8929f17c0] Starting thread...
[vist#0:0/mpeg4 @ 0x55a89293a100] [dec:mpeg4 @ 0x55a8929f4440] Starting thread...
[in#0/mov,mp4,m4a,3gp,3g2,mj2 @ 0x55a8929e0600] Starting thread...
Press [q] to stop, [?] for help
[mpeg4 @ 0x55a893ed3200] NVDEC capabilities:
[mpeg4 @ 0x55a893ed3200] format supported: yes, max_mb_count: 8192
[mpeg4 @ 0x55a893ed3200] min_width: 48, max_width: 2032
[mpeg4 @ 0x55a893ed3200] min_height: 16, max_height: 2032
[mpeg4 @ 0x55a893ed3200] Video width 3840 not within range from 48 to 2032
[mpeg4 @ 0x55a893ed3200] Failed setup for format cuda: hwaccel initialisation returned error.
[graph -1 input from stream 0:0 @ 0x75c970002e40] w:3840 h:2160 pixfmt:yuv420p tb:1/15360 fr:60/1 sar:1/1 csp:bt709 range:unknown
[graph -1 input from stream 0:0 @ 0x75c970002e40] video frame properties congruent with link at pts_time: 0
[h264_nvenc @ 0x55a8929e62c0] Using device cuda0 (type cuda) with h264_nvenc encoder.
[h264_nvenc @ 0x55a8929e62c0] Loaded Nvenc version 12.2
[h264_nvenc @ 0x55a8929e62c0] Nvenc initialized successfully
[h264_nvenc @ 0x55a8929e62c0] The selected preset is deprecated. Use p1 to p7 + -tune or fast/medium/slow.
Output #0, mp4, to 'output-h264_nvenc-p7.mp4':
  Metadata:
    major_brand     : qt  
    minor_version   : 512
    compatible_brands: qt  
    encoder         : Lavf61.5.101
  Stream #0:0: Video: h264 (Main), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/unknown, progressive, left), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 8000 kb/s, 60 fps, 15360 tbn (default)
      Metadata:
        creation_time   : 2024-09-15T04:25:29.000000Z
        handler_name    : VideoHandler
        vendor_id       :     
        timecode        : 01:00:00:00
        encoder         : Lavc61.13.100 h264_nvenc
      Side data:
        cpb: bitrate max/min/avg: 0/0/8000000 buffer size: 16000000 vbv_delay: N/A
  Stream #0:1: Audio: pcm_s16le (ipcm / 0x6D637069), 48000 Hz, stereo, s16, 1536 kb/s (default)
      Metadata:
        creation_time   : 2024-09-15T04:25:29.000000Z
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]


  


  How can I find the cause of the error and resolve it ?

  


  Also is there a way to improve the quality of the output video as it's much lower than the original ? I tried doing the same conversion using libxh264 (using the CPU) and that produced a far better video.

  


• HLS playback stopped with Player error : mediaError - bufferAppendError

  23 janvier, par Sumoanand

  I am trying to merge two videos together in the m3u8 manifest file.
However, exactly at the point to HLS stream discontinuity, video playback stops with following error :
Player error : mediaError - bufferAppendError

  


  Here is the sample m3u8 snippet :

  


  #EXT-X-PROGRAM-DATE-TIME:2025-01-23T01:23:10.200-06:00
#EXTINF:6.000
17.ts
#EXT-X-PROGRAM-DATE-TIME:2025-01-23T01:23:16.200-06:00
#EXTINF:6.000
18.ts
#EXT-X-DISCONTINUITY
#EXT-X-KEY:METHOD=NONE
#EXT-X-PROGRAM-DATE-TIME:2025-01-23T01:23:21.700-06:00
#EXTINF:6.000
10ak171685189367-007cb1c1a5398250e495vHD.20.ts
#EXT-X-PROGRAM-DATE-TIME:2025-01-23T01:23:27.700-06:00
#EXTINF:6.000
10ak171685189367-007cb1c1a5398250e495vHD.21.ts


  


  FFprobe output of 18.ts :

  


    Duration: 00:00:06.01, start: 1692.774667, bitrate: 3440 kb/s
  Program 1 
  Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 90k tbn
  Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 159 kb/s


  


  FFprobe output of 10ak171685189367-007cb1c1a5398250e495vHD.20.ts :

  


    Duration: 00:00:06.02, start: 1.443444, bitrate: 744 kb/s
  Program 1 
    Metadata:
  Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 90k tbn
  Stream #0:1[0x101](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 65 kb/s


  


  I would greatly appreciate any inputs.

  


• Correct syntax for using ffmpeg CUDA to crop and scale videos [closed]

  9 septembre 2024, par Stuart

  My NVIDIA and FFMPEG configuration is as follows :

  


  Linux TestBox1 6.8.0-41-generic #41-Ubuntu SMP PREEMPT_DYNAMIC Fri Aug 2 20:41:06 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

  


  NVIDIA-Linux-x86_64-560.31.02

  


  ffmpeg version git-2024-08-19-507c2a577
encoders:
 V....D av1_nvenc            NVIDIA NVENC av1 encoder (codec av1)
 V....D h264_nvenc           NVIDIA NVENC H.264 encoder (codec h264)
 V....D hevc_nvenc           NVIDIA NVENC hevc encoder (codec hevc)
decoders:
 V..... av1_cuvid            Nvidia CUVID AV1 decoder (codec av1)
 V..... h264_cuvid           Nvidia CUVID H264 decoder (codec h264)
 V..... hevc_cuvid           Nvidia CUVID HEVC decoder (codec hevc)
 V..... mjpeg_cuvid          Nvidia CUVID MJPEG decoder (codec mjpeg)
 V..... mpeg1_cuvid          Nvidia CUVID MPEG1VIDEO decoder (codec mpeg1video)
 V..... mpeg2_cuvid          Nvidia CUVID MPEG2VIDEO decoder (codec mpeg2video)
 V..... mpeg4_cuvid          Nvidia CUVID MPEG4 decoder (codec mpeg4)
 V..... vc1_cuvid            Nvidia CUVID VC1 decoder (codec vc1)
 V..... vp8_cuvid            Nvidia CUVID VP8 decoder (codec vp8)
 V..... vp9_cuvid            Nvidia CUVID VP9 decoder (codec vp9)
filters:
 ... bilateral_cuda    V->V       GPU accelerated bilateral filter
 T.. bwdif_cuda        V->V       Deinterlace CUDA frames
 ... chromakey_cuda    V->V       GPU accelerated chromakey filter
 ... colorspace_cuda   V->V       CUDA accelerated video color converter
 ..C crop              V->V       Crop the input video.
 T.C cropdetect        V->V       Auto-detect crop size.
 ... hwupload_cuda     V->V       Upload a system memory frame to a CUDA device.
 ... overlay_cuda      VV->V      Overlay one video on top of another using CUDA
 ... scale_cuda        V->V       GPU accelerated video resizer
 ... scale_npp         V->V       NVIDIA Performance Primitives video scaling and format conversion
 ... scale2ref_npp     VV->VV     NVIDIA Performance Primitives video scaling and format conversion to the given reference.
 ... sharpen_npp       V->V       NVIDIA Performance Primitives video sharpening filter.
 ... thumbnail_cuda    V->V       Select the most representative frame in a given sequence of consecutive frames.
 ... transpose_npp     V->V       NVIDIA Performance Primitives video transpose
 T.. yadif_cuda        V->V       Deinterlace CUDA frames


  


  I would like to be able to use CUDA to crop and scale videos but I cannot find the correct syntax.
My efforts usually work in terms of the scale but not the crop, here is an example of the type of problems I have been having :

  


  The source file in this example is a short mpeg2 video (960x540 with black bars top and bottom). The command is currently run from a bash script.

  


  ffmpeg -y -hwaccel cuda -hwaccel_output_format cuda -c:v mpeg2_cuvid -crop 960x408x0x66 -i $1 -vf scale_npp=1280x544 -c:a copy -c:v h264_nvenc -b:v 2M -preset slow $2


  


  This is throwing the following error :

  


  [mpeg2_cuvid @ 0x5e6d9deb56c0] cuvid decode callback error
[vist#0:0/mpeg2video @ 0x5e6d9de85b40] [dec:mpeg2_cuvid @ 0x5e6d9de7b7c0] Decoding error:        Generic error in an external library


  


  Have I a problem with my ffmpeg build, should the list of filters include something like crop_cuda or crop_npp or have I just got the wrong syntax to perform everything on the GPU (is it even possible).