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• FFmpeg only reading one channel

  29 août 2017, par AbstractDissonance

  Trying to read a stereo wav file and ffmpeg is only reading one channel. ffprobe returns 2 channels.

  I have used -ac 2 and then added -channel_layout stereo but all return 1 channel(or basically filling half the buffer I created).

  Basically the output size of ffmpeg is about half the wav file size.

  What I would like is for it to return every channel in

  Channel1_sample1, channel2_sample1, ..., ChannelN_sample1, channel1_sample2, etc...

  But, in reality, I’d rather just have it work with stereo ;) I’m giving it plenty large enough buffer to read to, so that isn’t the problem either.

  Here is the output

  ffprobe.exe -hide_banner -v quiet -print_format flat -show_streams -i temp.wav
  
  streams.stream.0.index=0
  
  streams.stream.0.codec_name="pcm_s16le"
  
  streams.stream.0.codec_long_name="PCM signed 16-bit little-endian"
  
  streams.stream.0.profile="unknown"
  
  streams.stream.0.codec_type="audio"
  
  streams.stream.0.codec_time_base="1/44100"
  
  streams.stream.0.codec_tag_string="[1][0][0][0]"
  
  streams.stream.0.codec_tag="0x0001"
  
  streams.stream.0.sample_fmt="s16"
  
  streams.stream.0.sample_rate="44100"
  
  streams.stream.0.channels=2
  
  streams.stream.0.channel_layout="unknown"
  
  streams.stream.0.bits_per_sample=16
  
  streams.stream.0.id="N/A"
  
  streams.stream.0.r_frame_rate="0/0"
  
  streams.stream.0.avg_frame_rate="0/0"
  
  streams.stream.0.time_base="1/44100"
  
  streams.stream.0.start_pts="N/A"
  
  streams.stream.0.start_time="N/A"
  
  streams.stream.0.duration_ts=14200200
  
  streams.stream.0.duration="322.000000"
  
  streams.stream.0.bit_rate="1411200"
  
  streams.stream.0.max_bit_rate="N/A"
  
  streams.stream.0.bits_per_raw_sample="N/A"
  
  streams.stream.0.nb_frames="N/A"
  
  streams.stream.0.nb_read_frames="N/A"
  
  streams.stream.0.nb_read_packets="N/A"
  
  streams.stream.0.disposition.default=0
  
  streams.stream.0.disposition.dub=0
  
  streams.stream.0.disposition.original=0
  
  streams.stream.0.disposition.comment=0
  
  streams.stream.0.disposition.lyrics=0
  
  streams.stream.0.disposition.karaoke=0
  
  streams.stream.0.disposition.forced=0
  
  streams.stream.0.disposition.hearing_impaired=0
  
  streams.stream.0.disposition.visual_impaired=0
  
  streams.stream.0.disposition.clean_effects=0
  
  streams.stream.0.disposition.attached_pic=0
  
  streams.stream.0.disposition.timed_thumbnails=0
  
  ffmpeg.exe -i temp.wav -loglevel quiet -f s16le -ac 2 -channel_layout stereo -

  temp.wav is just a standard stereo wav file.

• Extract frame timecodes from DV AVI

  21 juillet 2020, par Davor Josipovic

  I have some ancient DV AVI files (Type 1) from my camcorder.

  


  I would like to export the timecode of each frame to a seperate file. Here I read that ffprobe supports timecode extraction, but it is confusing since it mentions -show_format. As far as I know, DV AVI format encodes timecodes per frame.

  


  Anyway here is what I get for ffprobe -show_format testcc.avi :

  


  ffprobe version 4.3 Copyright (c) 2007-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200621
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[avi @ 0000025da5e55bc0] Switching to NI mode, due to poor interleaving
Input #0, avi, from 'testcc.avi':
  Duration: 00:06:16.68, start: 0.000000, bitrate: 28882 kb/s
    Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR 4:3], 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[FORMAT]
filename=testcc.avi
nb_streams=2
nb_programs=0
format_name=avi
format_long_name=AVI (Audio Video Interleaved)
start_time=0.000000
duration=376.680000
size=1359912960
bit_rate=28882084
probe_score=100
[/FORMAT]


  


  And for ffprobe -show_frames testcc.avi :

  


  ...
[FRAME]
media_type=video
stream_index=0
key_frame=1
pkt_pts=0
pkt_pts_time=0.000000
pkt_dts=0
pkt_dts_time=0.000000
best_effort_timestamp=0
best_effort_timestamp_time=0.000000
pkt_duration=1
pkt_duration_time=0.040000
pkt_pos=65032
pkt_size=144000
width=720
height=576
pix_fmt=yuv420p
sample_aspect_ratio=16:15
pict_type=I
coded_picture_number=0
display_picture_number=0
interlaced_frame=1
top_field_first=1
repeat_pict=0
color_range=unknown
color_space=unknown
color_primaries=unknown
color_transfer=unknown
chroma_location=topleft
[/FRAME]
[FRAME]
...


  


  And for ffprobe -show_streams testcc.avi :

  


  [STREAM]
index=0
codec_name=dvvideo
codec_long_name=DV (Digital Video)
profile=unknown
codec_type=video
codec_time_base=1/25
codec_tag_string=[0][0][0][0]
codec_tag=0x0000
width=720
height=576
coded_width=720
coded_height=576
closed_captions=0
has_b_frames=0
sample_aspect_ratio=16:15
display_aspect_ratio=4:3
pix_fmt=yuv420p
level=-99
color_range=unknown
color_space=unknown
color_transfer=unknown
color_primaries=unknown
chroma_location=topleft
field_order=unknown
timecode=N/A
refs=1
id=N/A
r_frame_rate=25/1
avg_frame_rate=25/1
time_base=1/25
start_pts=0
start_time=0.000000
duration_ts=N/A
duration=N/A
bit_rate=25000000
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=N/A
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=0
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
[/STREAM]
[STREAM]
index=1
codec_name=pcm_s16le
codec_long_name=PCM signed 16-bit little-endian
profile=unknown
codec_type=audio
codec_time_base=1/48000
codec_tag_string=[0][0][0][0]
codec_tag=0x0000
sample_fmt=s16
sample_rate=48000
channels=2
channel_layout=stereo
bits_per_sample=16
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/30000
start_pts=0
start_time=0.000000
duration_ts=N/A
duration=N/A
bit_rate=1536000
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=N/A
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=0
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
[/STREAM]


  


  I don't see any timecode. In Movie Maker (yes I know... it's on an old VM) I do see all the correct timecodes per frame. So what am I doing wrong ?

  


• FFmpeg and QuickTime Player dimensions of video do not match [duplicate]

  31 mai 2020, par GRS

  I have a video.mp4, which I scaled using FFmpeg to get out.mp4. The new video has the following probe :

  



  {'streams': [{'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': '1/50',
   'codec_tag_string': 'avc1',
   'codec_tag': '0x31637661',
   'width': 886,
   'height': 1920,
   'coded_width': 896,
   'coded_height': 1920,
   'has_b_frames': 2,
   'sample_aspect_ratio': '5120:1329',
   'display_aspect_ratio': '16:9',
   'pix_fmt': 'yuv420p',
   'level': 40,
   'chroma_location': 'left',
   'refs': 1,
   'is_avc': 'true',
   'nal_length_size': '4',
   'r_frame_rate': '25/1',
   'avg_frame_rate': '25/1',
   'time_base': '1/12800',
   'start_pts': 0,
   'start_time': '0.000000',
   'duration_ts': 384512,
   'duration': '30.040000',
   'bit_rate': '490832',
   'bits_per_raw_sample': '8',
   'nb_frames': '751',
   'disposition': {'default': 1,
    'dub': 0,
    'original': 0,
    'comment': 0,
    'lyrics': 0,
    'karaoke': 0,
    'forced': 0,
    'hearing_impaired': 0,
    'visual_impaired': 0,
    'clean_effects': 0,
    'attached_pic': 0,
    'timed_thumbnails': 0},
   'tags': {'language': 'und', 'handler_name': 'VideoHandler'}}],
 'format': {'filename': 'out.mp4',
  'nb_streams': 1,
  'nb_programs': 0,
  'format_name': 'mov,mp4,m4a,3gp,3g2,mj2',
  'format_long_name': 'QuickTime / MOV',
  'start_time': '0.000000',
  'duration': '30.040000',
  'size': '1852948',
  'bit_rate': '493461',
  'probe_score': 100,
  'tags': {'major_brand': 'isom',
   'minor_version': '512',
   'compatible_brands': 'isomiso2avc1mp41',
   'encoder': 'Lavf58.20.100'}}}


  



  I am expecting my video player to say the video is 886 x 1920, however, it is 3413:1920.


  



  What could be the error ? I am using pix_frmt=yuva420p and codec=libx264 to create the video.

  



  The error is that my ascpect ratio remains 16:9, which is the original input video, when it should automatically change to 9:19. E.g. 3413 = 1920 * 16 / 9. So why isn't the ascpect ratio changed when the video is scaled ?