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  • Create fragmented MP4 from MP3

    25 octobre 2020, par Stefan Falk

    I am trying to convert an MP3 file to a fragmented MP4 like this :

    


    ffmpeg -i input.mp3 -strict experimental -acodec aac -b:a 256k -f mp4 \
       -movflags faststart+frag_keyframe+empty_moov+separate_moof output.mp4 


    


    However, using Bento4 I can see that there is just one giant mdat object instead of a series of those :

    


    [ftyp] size=8+24
  major_brand = isom
  minor_version = 200
  compatible_brand = isom
  compatible_brand = iso2
  compatible_brand = iso6
  compatible_brand = mp41
[moov] size=8+701
  ...
[moof] size=8+62364
  ...
[mdat] size=8+5794679
[mfra] size=8+59
  [tfra] size=12+31, version=1
    track_ID = 1
    length_size_of_traf_num = 0
    length_size_of_trun_num = 0
    length_size_of_sample_num = 0
  [mfro] size=12+4
    mfra_size = 67


    


    I think what I want is this :

    


    enter image description here

    


    (source)

    


    But I can't seem to be able to get this from ffmpeg.

    


    I found some other options here like

    


    $ ffmpeg -h muxer=ismv&#xA;...&#xA;-frag_duration     <int>   E.... Maximum fragment duration&#xA;-min_frag_duration <int>   E.... Minimum fragment duration&#xA;-frag_size         <int>   E.... Maximum fragment size&#xA;</int></int></int>

    &#xA;

    but playing around with these didn't change the output.

    &#xA;

    How can I create fragments of a specific sice e.g. 5 seconds each ?

    &#xA;

  • avformat/pcm : decrease target audio frame per sec to 10

    3 mars 2024, par Marton Balint
    avformat/pcm : decrease target audio frame per sec to 10

    This makes the wav and pcm demuxer demux bigger packets, which is more
    
efficient.
    

    As a side effect of the bigger packets, audio durations can become less exact
    
for command lines such as "ffmpeg -i $INPUT -c:a copy -t 1.0 $OUTPUT".
    

    Signed-off-by : Marton Balint <cus@passwd.hu>
    • [DH] libavformat/pcm.c
    • [DH] tests/ref/acodec/pcm-s16be
    • [DH] tests/ref/acodec/pcm-s16be_planar
    • [DH] tests/ref/acodec/pcm-s16le_planar
    • [DH] tests/ref/acodec/pcm-s24be
    • [DH] tests/ref/acodec/pcm-s24le_planar
    • [DH] tests/ref/acodec/pcm-s32be
    • [DH] tests/ref/acodec/pcm-s32le_planar
    • [DH] tests/ref/acodec/pcm-s8_planar
    • [DH] tests/ref/acodec/pcm-u16be
    • [DH] tests/ref/acodec/pcm-u16le
    • [DH] tests/ref/acodec/pcm-u24be
    • [DH] tests/ref/acodec/pcm-u24le
    • [DH] tests/ref/acodec/pcm-u32be
    • [DH] tests/ref/acodec/pcm-u32le
    • [DH] tests/ref/acodec/s302m
    • [DH] tests/ref/fate/dcinema-encode
    • [DH] tests/ref/fate/filter-acrossfade
    • [DH] tests/ref/fate/filter-adelay
    • [DH] tests/ref/fate/filter-aecho
    • [DH] tests/ref/fate/filter-aemphasis-50fm
    • [DH] tests/ref/fate/filter-aemphasis-75kf
    • [DH] tests/ref/fate/filter-afade-esin
    • [DH] tests/ref/fate/filter-afade-exp
    • [DH] tests/ref/fate/filter-afade-hsin
    • [DH] tests/ref/fate/filter-afade-iqsin
    • [DH] tests/ref/fate/filter-afade-log
    • [DH] tests/ref/fate/filter-afade-qsin
    • [DH] tests/ref/fate/filter-agate
    • [DH] tests/ref/fate/filter-alimiter
    • [DH] tests/ref/fate/filter-amerge
    • [DH] tests/ref/fate/filter-anequalizer
    • [DH] tests/ref/fate/filter-apad
    • [DH] tests/ref/fate/filter-asegment-samples-absolute
    • [DH] tests/ref/fate/filter-asegment-samples-relative
    • [DH] tests/ref/fate/filter-asegment-timestamps-absolute
    • [DH] tests/ref/fate/filter-asegment-timestamps-relative
    • [DH] tests/ref/fate/filter-asetrate
    • [DH] tests/ref/fate/filter-atrim-mixed
    • [DH] tests/ref/fate/filter-atrim-time
    • [DH] tests/ref/fate/filter-chorus
    • [DH] tests/ref/fate/filter-compand
    • [DH] tests/ref/fate/filter-crystalizer
    • [DH] tests/ref/fate/filter-dcshift
    • [DH] tests/ref/fate/filter-earwax
    • [DH] tests/ref/fate/filter-extrastereo
    • [DH] tests/ref/fate/filter-pan-downmix1
    • [DH] tests/ref/fate/filter-pan-downmix2
    • [DH] tests/ref/fate/filter-pan-mono1
    • [DH] tests/ref/fate/filter-pan-mono2
    • [DH] tests/ref/fate/filter-pan-stereo1
    • [DH] tests/ref/fate/filter-pan-stereo2
    • [DH] tests/ref/fate/filter-pan-stereo3
    • [DH] tests/ref/fate/filter-pan-stereo4
    • [DH] tests/ref/fate/filter-pan-upmix1
    • [DH] tests/ref/fate/filter-pan-upmix2
    • [DH] tests/ref/fate/filter-stereotools
    • [DH] tests/ref/fate/flcl1905
    • [DH] tests/ref/fate/g722-encode
    • [DH] tests/ref/fate/g726-encode-2bit
    • [DH] tests/ref/fate/g726-encode-3bit
    • [DH] tests/ref/fate/g726-encode-4bit
    • [DH] tests/ref/fate/g726-encode-5bit
    • [DH] tests/ref/fate/matroska-move-cues-to-front
    • [DH] tests/ref/fate/mov-channel-description
    • [DH] tests/ref/fate/mov-mp4-pcm
    • [DH] tests/ref/fate/mov-mp4-pcm-float
    • [DH] tests/ref/lavf/ast
    • [DH] tests/ref/lavf/mov
    • [DH] tests/ref/lavf/mov_rtphint
    • [DH] tests/ref/lavf/s16.voc
    • [DH] tests/ref/lavf/smjpeg
    • [DH] tests/ref/lavf/voc
    • [DH] tests/ref/seek/acodec-adpcm-ima_wav
    • [DH] tests/ref/seek/acodec-adpcm-ima_wav-trellis
    • [DH] tests/ref/seek/acodec-adpcm-ms
    • [DH] tests/ref/seek/acodec-adpcm-ms-trellis
    • [DH] tests/ref/seek/acodec-adpcm-yamaha
    • [DH] tests/ref/seek/acodec-adpcm-yamaha-trellis
    • [DH] tests/ref/seek/acodec-pcm-alaw
    • [DH] tests/ref/seek/acodec-pcm-f32be
    • [DH] tests/ref/seek/acodec-pcm-f32le
    • [DH] tests/ref/seek/acodec-pcm-f64be
    • [DH] tests/ref/seek/acodec-pcm-f64le
    • [DH] tests/ref/seek/acodec-pcm-mulaw
    • [DH] tests/ref/seek/acodec-pcm-s16le
    • [DH] tests/ref/seek/acodec-pcm-s24le
    • [DH] tests/ref/seek/acodec-pcm-s32le
    • [DH] tests/ref/seek/acodec-pcm-u8
    • [DH] tests/ref/seek/lavf-al
    • [DH] tests/ref/seek/lavf-au
    • [DH] tests/ref/seek/lavf-mov
    • [DH] tests/ref/seek/lavf-ul
    • [DH] tests/ref/seek/lavf-voc
    • [DH] tests/ref/seek/lavf-wav

  • ff_put_wav_header : add flag to force WAVEFORMATEX

    30 avril 2014, par Daniel Verkamp
    ff_put_wav_header : add flag to force WAVEFORMATEX

    Partially undoes commit 2c4e08d89327595f7f4be57dda4b3775e1198d5e :
    

        riff : always generate a proper WAVEFORMATEX structure in
    
    ff_put_wav_header
    

    A new flag, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX, is added to force the
    
use of WAVEFORMATEX rather than PCMWAVEFORMAT even for PCM codecs.
    

    This flag is used in the Matroska muxer (the cause of the original
    
change) and in the ASF muxer, because the specifications for
    
these formats indicate explicitly that WAVEFORMATEX should be used.
    

    Muxers for other formats will return to the original behavior of writing
    
PCMWAVEFORMAT when writing a header for raw PCM.
    

    In particular, this causes raw PCM in WAV to generate the canonical
    
44-byte header expected by some tools.
    

    Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libavformat/asfenc.c
    • [DH] libavformat/avienc.c
    • [DH] libavformat/matroskaenc.c
    • [DH] libavformat/movenc.c
    • [DH] libavformat/riff.h
    • [DH] libavformat/riffenc.c
    • [DH] libavformat/wavenc.c
    • [DH] libavformat/wtvenc.c
    • [DH] tests/fate/filter-audio.mak
    • [DH] tests/ref/acodec/adpcm-adx
    • [DH] tests/ref/acodec/adpcm-ima_qt
    • [DH] tests/ref/acodec/adpcm-ima_wav
    • [DH] tests/ref/acodec/adpcm-ms
    • [DH] tests/ref/acodec/adpcm-swf
    • [DH] tests/ref/acodec/adpcm-yamaha
    • [DH] tests/ref/acodec/alac
    • [DH] tests/ref/acodec/flac
    • [DH] tests/ref/acodec/g723_1
    • [DH] tests/ref/acodec/mp2
    • [DH] tests/ref/acodec/mp2fixed
    • [DH] tests/ref/acodec/pcm-alaw
    • [DH] tests/ref/acodec/pcm-f32be
    • [DH] tests/ref/acodec/pcm-f32le
    • [DH] tests/ref/acodec/pcm-f64be
    • [DH] tests/ref/acodec/pcm-f64le
    • [DH] tests/ref/acodec/pcm-mulaw
    • [DH] tests/ref/acodec/pcm-s16be
    • [DH] tests/ref/acodec/pcm-s16be_planar
    • [DH] tests/ref/acodec/pcm-s16le
    • [DH] tests/ref/acodec/pcm-s16le_planar
    • [DH] tests/ref/acodec/pcm-s24be
    • [DH] tests/ref/acodec/pcm-s24le
    • [DH] tests/ref/acodec/pcm-s24le_planar
    • [DH] tests/ref/acodec/pcm-s32be
    • [DH] tests/ref/acodec/pcm-s32le
    • [DH] tests/ref/acodec/pcm-s32le_planar
    • [DH] tests/ref/acodec/pcm-s8
    • [DH] tests/ref/acodec/pcm-s8_planar
    • [DH] tests/ref/acodec/pcm-u16be
    • [DH] tests/ref/acodec/pcm-u16le
    • [DH] tests/ref/acodec/pcm-u24be
    • [DH] tests/ref/acodec/pcm-u24le
    • [DH] tests/ref/acodec/pcm-u32be
    • [DH] tests/ref/acodec/pcm-u32le
    • [DH] tests/ref/acodec/pcm-u8
    • [DH] tests/ref/acodec/roqaudio
    • [DH] tests/ref/fate/mapchan-6ch-extract-2
    • [DH] tests/ref/fate/mapchan-6ch-extract-2-downmix-mono
    • [DH] tests/ref/fate/mapchan-silent-mono
    • [DH] tests/ref/lavf/w64
    • [DH] tests/ref/lavf/wav
    • [DH] tests/ref/seek/acodec-pcm-s16le
    • [DH] tests/ref/seek/acodec-pcm-u8
    • [DH] tests/ref/seek/lavf-wav

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