Sur d’autres sites (6521)

• FFMPEG Generate video clips and concatenate them all

  8 février 2020, par lms702

  I have a bunch of images (.png) and audio files (.wav) that I want to combine and concatenate. For example, if I have a1.wav, i1.png, a2.wav, and i2.png, I want to output a video that is a1.wav overlayed onto i1.png, then (concatenated to a2.wav overlayed onto i2.png.

  Currently, my approach is to save each individual clip and then concatenate them all at the end.

  To save each clip, I use this command (in a loop for all of my clips) :

  ffmpeg -i {imageFile} -i {audioFile} -nostdin -qscale:v 1 -vcodec libx264 -pix_fmt yuv420p {outputFile.mp4}``

  It outputs an mp4 that kind of works - the playback is really buggy but works in full screen.

  My current approach to concatenating has not been at all successful. I create a list of the clip names and put it into filename then call this command :

  ffmpeg -f concat -i {filename} -c copy clips/finalOutput.mp4

  This outputs a pretty jumbled video and this error repeated :

  [mp4 @ 000001cdec110740] Non-monotonous DTS in output stream 0:1; previous: 1045041, current: 604571; changing to 1045042. This may result in incorrect timestamps in the output file.

  So, a few questions.

  What is the best way to go about this process ?

  Should I be saving each clip or is there a better way to do it all in one command ?

  If I do save each clip, is there a better file format I should use ?

  Plz help with the concatenation command.

  Also note that because I am automating this with python I can build arbitrarily large commands, though that might not be ideal.

  I am very new to this and I would really appreciate any help !

• Metadata disappears when hevc_nvenc is used in ffmpeg (Estimated to be overwrite with null value.)

  30 janvier 2020, par Dashhh

  disappear metadata using at heve_nvenc

  • When using h264_cuvid and hevc_nvenc through ffmpeg on my server, the metadata of the files that come out of the encoding output is lost.
    There was no such thing in h264_nvenc. Also, the libx265 encoding result has metadata.

  • The ffmpeg command I used is as follows.

  ffmpeg -v debug -vsync 0 -hwaccel cuvid -hwaccel_device 2 -c:v h264_cuvid \
  
  -i ./intputfile.mp4 -map_metadata 0 -map_metadata 0:s:0 -map_metadata:s:v 0:s:v -map_metadata:s:a 0:s:a \
  
  -map 0:v -vf hwdownload,format=nv12,format=yuv420p,scale=iw*2:ih*2 \
  
  -c:v nvenc_hevc -preset slow -rc vbr_hq -pix_fmt yuv420p -b:v 5M -maxrate:v 8M -gpu 2 \
  
  -map 0:a -c:a copy \
  
  -color_range tv -colorspace bt709 -color_trc bt709 -color_primaries bt709 \
  
  hevc_output_test.mp4

  ---

  • Refer to the image below for property information on the generated file.

  

  • In the image in the link, the left pane is a playable h264_nvenc encoding deliverable file.
  • In the image in the link, the right pane is a non-replayable hevc_nvenc encoding deliverable
    file.
    • Program available for play : VLC
    • Unable to play : Ubuntu 18.04 Base Video Player, Samsung Smart TV (h264_nvenc and libx265 encoded deliverables files can be played).
  • Please refer to the image below for an error message displayed in the Player when it is not possible to play. (This is the default video player for ubuntu 18.04.)

  

  • I added ‘-f matroska’ option to the command written above and made a result.(The result file extension has also been changed to "mkv")
    Unusually, metadata exists in the process in which images are made as follows :
    

  • However, at the end of encoding, this metadata disappears again. (It looks exactly like the first image in the right pane.)

  • The path to which this information was obtained was identified by right-clicking the file in Ubuntu (18.04) to the category "Properties" - "video/audio".
    Can you tell me why this is happening ?
    If not, please advise me where I should look.

  CUDA : 10.2

  Video SDK Version (Nvenc version) : 9.1

  GPU : GeForce GTX 1080 Ti

  Driver Version : 440.33.01

• FFmpeg, MPEG4 video rotate and Windows

  25 décembre 2017, par user3768884

  I have this kind of video recorded in some Samsung Galaxy phone (info from : "ffprobe -v error -show_format -show_streams filename.mp4")

  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=High
  
  codec_type=video
  
  codec_time_base=7048499/423000000
  
  codec_tag_string=avc1
  
  codec_tag=0x31637661
  
  width=1920
  
  height=1080
  
  coded_width=1920
  
  coded_height=1080
  
  has_b_frames=0
  
  sample_aspect_ratio=0:1
  
  display_aspect_ratio=0:1
  
  pix_fmt=yuv420p
  
  level=40
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=unknown
  
  timecode=N/A
  
  refs=1
  
  is_avc=true
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=30/1
  
  avg_frame_rate=211500000/7048499
  
  time_base=1/90000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=7048499
  
  duration=78.316656
  
  bit_rate=17010472
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=2350
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:rotate=90
  
  TAG:creation_time=2017-12-17T13:42:14.000000Z
  
  TAG:language=eng
  
  TAG:handler_name=VideoHandle
  
  [SIDE_DATA]
  
  side_data_type=Display Matrix
  
  displaymatrix=
  
  00000000:            0       65536           0
  
  00000001:       -65536           0           0
  
  00000002:            0           0  1073741824
  
  
  
  rotation=-90
  
  [/SIDE_DATA]
  
  [/STREAM]
  
  [STREAM]
  
  index=1
  
  codec_name=aac
  
  codec_long_name=AAC (Advanced Audio Coding)
  
  profile=LC
  
  codec_type=audio
  
  codec_time_base=1/48000
  
  codec_tag_string=mp4a
  
  codec_tag=0x6134706d
  
  sample_fmt=fltp
  
  sample_rate=48000
  
  channels=2
  
  channel_layout=stereo
  
  bits_per_sample=0
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/48000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=3772416
  
  duration=78.592000
  
  bit_rate=126154
  
  max_bit_rate=128000
  
  bits_per_raw_sample=N/A
  
  nb_frames=3684
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:creation_time=2017-12-17T13:42:14.000000Z
  
  TAG:language=eng
  
  TAG:handler_name=SoundHandle
  
  [/STREAM]
  
  [FORMAT]
  
  filename=original_galaxy.mp4
  
  nb_streams=2
  
  nb_programs=0
  
  format_name=mov,mp4,m4a,3gp,3g2,mj2
  
  format_long_name=QuickTime / MOV
  
  start_time=0.000000
  
  duration=78.592000
  
  size=167808936
  
  bit_rate=17081528
  
  probe_score=100
  
  TAG:major_brand=isom
  
  TAG:minor_version=0
  
  TAG:compatible_brands=isom3gp4
  
  TAG:creation_time=2017-12-17T13:42:14.000000Z
  
  [/FORMAT]

  Since all my media players does not support rotate-knowledge, I have turned the video over again, and at the same time slightly decreased the resolution of command "ffmpeg -i "input.mp4" -vf "scale=720:1280,transpose=0,transpose=0" -c:a copy "output.mp4""

  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=High
  
  codec_type=video
  
  codec_time_base=1/60
  
  codec_tag_string=avc1
  
  codec_tag=0x31637661
  
  width=720
  
  height=1280
  
  coded_width=720
  
  coded_height=1280
  
  has_b_frames=2
  
  sample_aspect_ratio=0:1
  
  display_aspect_ratio=0:1
  
  pix_fmt=yuv420p
  
  level=31
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=unknown
  
  timecode=N/A
  
  refs=1
  
  is_avc=true
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=30/1
  
  avg_frame_rate=30/1
  
  time_base=1/15360
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=1203717
  
  duration=78.366992
  
  bit_rate=2570692
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=2351
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:language=eng
  
  TAG:handler_name=VideoHandler
  
  [/STREAM]
  
  [STREAM]
  
  index=1
  
  codec_name=aac
  
  codec_long_name=AAC (Advanced Audio Coding)
  
  profile=LC
  
  codec_type=audio
  
  codec_time_base=1/48000
  
  codec_tag_string=mp4a
  
  codec_tag=0x6134706d
  
  sample_fmt=fltp
  
  sample_rate=48000
  
  channels=2
  
  channel_layout=stereo
  
  bits_per_sample=0
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/48000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=3772416
  
  duration=78.592000
  
  bit_rate=126154
  
  max_bit_rate=126154
  
  bits_per_raw_sample=N/A
  
  nb_frames=3684
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:language=eng
  
  TAG:handler_name=SoundHandler
  
  [/STREAM]
  
  [FORMAT]
  
  filename=from_ffmpeg.mp4
  
  nb_streams=2
  
  nb_programs=0
  
  format_name=mov,mp4,m4a,3gp,3g2,mj2
  
  format_long_name=QuickTime / MOV
  
  start_time=0.000000
  
  duration=78.592000
  
  size=26503544
  
  bit_rate=2697836
  
  probe_score=100
  
  TAG:major_brand=isom
  
  TAG:minor_version=512
  
  TAG:compatible_brands=isomiso2avc1mp41
  
  TAG:encoder=Lavf57.41.100
  
  [/FORMAT]

  This works very well in VLC, for example. However, Windows Media Player or Samsung TV does not play it. Windows Explorer does not even show a video thumbnail, so the video file is broken by Windows.

  Is not FFmpeg able to produce a standard MPEG4 file, or what the hell is this about ? I’ve tried all the alternatives presented, such as "-fflags +genpts", "-fflags genpts", "-movflags faststart", "-movflags +faststart", "pix_fmt=yuv420p" etc. but nothing worked.

  The sound I copied directly.