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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.

  • merging Multi-Track MP4 Files with ffmpeg show error time porgress bar

    9 juillet 2024, par EasonWaii

    I need to merge two videos into one using ffmpeg. The resulting video should have two video tracks and one audio track, with the audio track taken from the longer video.

    


    When playing the merged video in a player like PotPlayer or VLC, it should default to playing the shorter video track. However, users should be able to switch to the other video track if they want.

    


    The problem I am facing :
Everything is working fine, except when the player defaults to the shorter video track, it shows the timeline of the longer video track.

    


     built with Apple clang version 15.0.0 (clang-1500.3.9.4)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/7.0.1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox
  libavutil      59.  8.100 / 59.  8.100
  libavcodec     61.  3.100 / 61.  3.100
  libavformat    61.  1.100 / 61.  1.100
  libavdevice    61.  1.100 / 61.  1.100
  libavfilter    10.  1.100 / 10.  1.100
  libswscale      8.  1.100 /  8.  1.100
  libswresample   5.  1.100 /  5.  1.100
  libpostproc    58.  1.100 / 58.  1.100
{
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output21.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.16.100
  Duration: 00:00:12.84, start: 0.000000, bitrate: 2207 kb/s
  Stream #0:0[0x1](und): Video: hevc (Main) (hev1 / 0x31766568), yuv420p(tv, progressive), 720x1280 [SAR 1:1 DAR 9:16], 1052 kb/s, 30 fps, 30 tbr, 15360 tbn
      Metadata:
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 720x1280, 1293 kb/s, 29.83 fps, 29.83 tbr, 11456 tbn (default)
      Metadata:
        handler_name    : ?Mainconcept Video Media Handler
        vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]
    "streams": [
        {
            "index": 0,
            "codec_name": "hevc",
            "codec_long_name": "H.265 / HEVC (High Efficiency Video Coding)",
            "profile": "Main",
            "codec_type": "video",
            "codec_tag_string": "hev1",
            "codec_tag": "0x31766568",
            "width": 720,
            "height": 1280,
            "coded_width": 720,
            "coded_height": 1280,
            "closed_captions": 0,
            "film_grain": 0,
            "has_b_frames": 2,
            "sample_aspect_ratio": "1:1",
            "display_aspect_ratio": "9:16",
            "pix_fmt": "yuv420p",
            "level": 93,
            "color_range": "tv",
            "chroma_location": "left",
            "field_order": "progressive",
            "refs": 1,
            "id": "0x1",
            "r_frame_rate": "30/1",
            "avg_frame_rate": "30/1",
            "time_base": "1/15360",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 196096,
            "duration": "12.766667",
            "bit_rate": "1052926",
            "nb_frames": "383",
            "extradata_size": 2480,
            "disposition": {
                "default": 0,
                "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,
                "non_diegetic": 0,
                "captions": 0,
                "descriptions": 0,
                "metadata": 0,
                "dependent": 0,
                "still_image": 0
            },
            "tags": {
                "language": "und",
                "handler_name": "VideoHandler",
                "vendor_id": "[0][0][0][0]"
            }
        },
        {
            "index": 1,
            "codec_name": "h264",
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
            "profile": "High",
            "codec_type": "video",
            "codec_tag_string": "avc1",
            "codec_tag": "0x31637661",
            "width": 720,
            "height": 1280,
            "coded_width": 720,
            "coded_height": 1280,
            "closed_captions": 0,
            "film_grain": 0,
            "has_b_frames": 2,
            "pix_fmt": "yuv420p",
            "level": 31,
            "color_range": "tv",
            "color_space": "bt709",
            "color_transfer": "bt709",
            "color_primaries": "bt709",
            "chroma_location": "left",
            "field_order": "progressive",
            "refs": 1,
            "is_avc": "true",
            "nal_length_size": "4",
            "id": "0x2",
            "r_frame_rate": "179/6",
            "avg_frame_rate": "3448256/115597",
            "time_base": "1/11456",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 115597,
            "duration": "10.090520",
            "bit_rate": "1293284",
            "bits_per_raw_sample": "8",
            "nb_frames": "301",
            "extradata_size": 46,
            "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,
                "non_diegetic": 0,
                "captions": 0,
                "descriptions": 0,
                "metadata": 0,
                "dependent": 0,
                "still_image": 0
            },
            "tags": {
                "language": "eng",
                "handler_name": "\u001fMainconcept Video Media Handler",
                "vendor_id": "[0][0][0][0]"
            }
        },
        {
            "index": 2,
            "codec_name": "aac",
            "codec_long_name": "AAC (Advanced Audio Coding)",
            "profile": "LC",
            "codec_type": "audio",
            "codec_tag_string": "mp4a",
            "codec_tag": "0x6134706d",
            "sample_fmt": "fltp",
            "sample_rate": "44100",
            "channels": 2,
            "channel_layout": "stereo",
            "bits_per_sample": 0,
            "initial_padding": 0,
            "id": "0x3",
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/44100",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 566244,
            "duration": "12.840000",
            "bit_rate": "130447",
            "nb_frames": "554",
            "extradata_size": 5,
            "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,
                "non_diegetic": 0,
                "captions": 0,
                "descriptions": 0,
                "metadata": 0,
                "dependent": 0,
                "still_image": 0
            },
            "tags": {
                "language": "und",
                "handler_name": "SoundHandler",
                "vendor_id": "[0][0][0][0]"
            }
        }
    ],
    "format": {
        "filename": "output21.mp4",
        "nb_streams": 3,
        "nb_programs": 0,
        "nb_stream_groups": 0,
        "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
        "format_long_name": "QuickTime / MOV",
        "start_time": "0.000000",
        "duration": "12.840000",
        "size": "3543155",
        "bit_rate": "2207573",
        "probe_score": 100,
        "tags": {
            "major_brand": "isom",
            "minor_version": "512",
            "compatible_brands": "isomiso2avc1mp41",
            "encoder": "Lavf59.16.100"
        }
    }
}



    


    I want the timeline to display correctly according to the shorter video track when it is being played, without truncating the timeline of the longer video track and affecting its playback.

    


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