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  • Losing audio quality when merging multiple videos with FFmpeg

    30 mai 2021, par Charly

    I am trying to merge multiple videos (a few seconds each) into one, using FFmpeg.

    


    Merging all at once

    


    I first tried merging all videos with one FFmpeg command, but it only seems to work with up to a certain amount of videos. On my Raspberry Pi 4 (2BG RAM), it worked for 16 videos and broke (ran out of memory ?) while merging 36 videos (command and ouput below)

    


    ffmpeg -i 1Rbrdn1Xp.mp4 -i G7eYqdFPb.mp4 -i -Xo-6ABm3.mp4 -i 6As9IlqbW.mp4 -i tz9tVKFA-.mp4
-i MS6DHZoJE.mp4 -i CeJYs99-G.mp4 -i Hsv5X48IC.mp4 -i Gm_DtjNU4.mp4 -i PZytbInZL.mp4
-i qsIJuvKO2.mp4 -i c5wxGk_Fx.mp4 -i j4K1qA7ih.mp4 -i AIpVWuhGV.mp4 -i yiLk0snSh.mp4
-i q1zmytaXZ.mp4 -i VRwQvLxaW.mp4 -i 0_3yLrokH.mp4 -i fW28LPQsk.mp4 -i La6WsGeE8.mp4
-i FlroQnCHq.mp4 -i c7SiL_qSU.mp4 -i aaGTUMJXD.mp4 -i hvXYBaCSM.mp4 -i CMDaFrWM4.mp4
-i _YAGDRyQN.mp4 -i RQXyshs_o.mp4 -i 96pKlIZxW.mp4 -i HVOOeCUYG.mp4 -i pJFxq7BTx.mp4
-i VxMJQqbK5.mp4 -i mkgbViPTI.mp4 -i zrjj93b5c.mp4 -i AL9oG1F36.mp4 -i IsUnC0NPb.mp4
-i Qhj2bhab9.mp4 -y -filter_complex concat=n=36:v=1:a=1 -vsync 2 kn-dQSN-v.mp4


    


    ffmpeg version 4.1.6-1~deb10u1+rpt1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
(...)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1Rbrdn1Xp.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.20.100
  Duration: 00:00:08.08, start: 0.000000, bitrate: 602 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 533 kb/s, 57.62 fps, 60 tbr, 15360 tbn, 120 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 64 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'G7eYqdFPb.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.20.100
  Duration: 00:00:21.00, start: 0.000000, bitrate: 310 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 229 kb/s, 59.09 fps, 60 tbr, 15360 tbn, 120 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 72 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
(...)
Stream mapping:
  Stream #0:0 (h264) -> concat:in0:v0
  Stream #0:1 (aac) -> concat:in0:a0
  Stream #1:0 (h264) -> concat:in1:v0
  Stream #1:1 (aac) -> concat:in1:a0
(...)
  concat:out:v0 -> Stream #0:0 (libx264)
  concat:out:a0 -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[libx264 @ 0x17cb5e0] using SAR=1/1   0kB time=-577014:32:22.77 bitrate=  -0.0kbits/s speed=N/A    
[libx264 @ 0x17cb5e0] using cpu capabilities: ARMv6 NEON
[libx264 @ 0x17cb5e0] profile High, level 3.2
[libx264 @ 0x17cb5e0] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
(...)
Output #0, mp4, to 'kn-dQSN-v.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.20.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 60 fps, 15360 tbn, 60 tbc (default)
    Metadata:
      encoder         : Lavc58.35.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 69 kb/s (default)
    Metadata:
      encoder         : Lavc58.35.100 aac
frame=15952 fps= 52 q=31.0 size=   10240kB time=00:04:33.02 bitrate= 307.3kbits/s speed=0.844x
[h264 @ 0x3472d80] get_buffer() failed40kB time=00:04:33.02 bitrate= 307.3kbits/s speed=0.844x    
[h264 @ 0x3472d80] thread_get_buffer() failed
[h264 @ 0x3472d80] decode_slice_header error
[h264 @ 0x3472d80] no frame!
Error while decoding stream #15:0: Invalid data found when processing input
[h264 @ 0x34f54d0] get_buffer() failed
[h264 @ 0x34f54d0] thread_get_buffer() failed
[h264 @ 0x34f54d0] decode_slice_header error
[h264 @ 0x34f54d0] no frame!
[h264 @ 0x3472d80] get_buffer() failed
[h264 @ 0x3472d80] thread_get_buffer() failed
(...)
Error while decoding stream #15:0: Invalid data found when processing input
[h264 @ 0x3472d80] reference picture missing during reorder
[h264 @ 0x3472d80] Missing reference picture, default is 65660
[h264 @ 0x34c4540] mmco: unref short failure
[h264 @ 0x34f54d0] get_buffer() failed08kB time=00:04:45.37 bitrate= 316.0kbits/s speed=0.845x    
[h264 @ 0x34f54d0] thread_get_buffer() failed
[h264 @ 0x34f54d0] decode_slice_header error
[h264 @ 0x34f54d0] no frame!
[h264 @ 0x3472d80] decode_slice_header error
[h264 @ 0x3472d80] no frame!
Error while decoding stream #15:0: Invalid data found when processing input
[h264 @ 0x34f54d0] mmco: unref short failure
Error while decoding stream #15:0: Invalid data found when processing input
[h264 @ 0x3472d80] get_buffer() failed
[h264 @ 0x3472d80] thread_get_buffer() failed
[h264 @ 0x3472d80] decode_slice_header error
[h264 @ 0x3472d80] no frame!
Error while decoding stream #15:0: Invalid data found when processing input
[h264 @ 0x3472d80] get_buffer() failed
[h264 @ 0x3472d80] thread_get_buffer() failed
[h264 @ 0x3472d80] decode_slice_header error
[h264 @ 0x3472d80] no frame!
[h264 @ 0x34f54d0] reference picture missing during reorder
    Last message repeated 1 times
[h264 @ 0x34f54d0] Missing reference picture, default is 65708
    Last message repeated 1 times
Error while decoding stream #15:0: Invalid data found when processing input
[h264 @ 0x34dccb0] reference picture missing during reorder
[h264 @ 0x34dccb0] Missing reference picture, default is 65716
[h264 @ 0x3472d80] mmco: unref short failure
[h264 @ 0x34f54d0] decode_slice_header error
[h264 @ 0x34f54d0] no frame!
Error while decoding stream #15:0: Invalid data found when processing inputbits/s speed=0.845x    
[h264 @ 0x3480010] get_buffer() failed
[h264 @ 0x3480010] thread_get_buffer() failed
[h264 @ 0x3480010] decode_slice_header error
[h264 @ 0x3480010] no frame!
[h264 @ 0x34c4540] decode_slice_header error
[h264 @ 0x34c4540] no frame!
Error while decoding stream #15:0: Invalid data found when processing input
[h264 @ 0x3480010] mmco: unref short failure
Error while decoding stream #15:0: Invalid data found when processing input
[h264 @ 0x34c4540] get_buffer() failed
[h264 @ 0x34c4540] thread_get_buffer() failed
[h264 @ 0x34c4540] decode_slice_header error
[h264 @ 0x34c4540] no frame!
Error while decoding stream #15:0: Invalid data found when processing input
[h264 @ 0x34c4540] get_buffer() failed
[h264 @ 0x34c4540] thread_get_buffer() failed
[h264 @ 0x34c4540] decode_slice_header error
[h264 @ 0x34c4540] no frame!
[h264 @ 0x34f54d0] decode_slice_header error
[h264 @ 0x34f54d0] no frame!
Error while decoding stream #15:0: Invalid data found when processing input
[h264 @ 0x3480010] reference picture missing during reorder
    Last message repeated 1 times
[h264 @ 0x3480010] Missing reference picture, default is 65772
    Last message repeated 1 times
Error while decoding stream #15:0: Invalid data found when processing input
[h264 @ 0x3472d80] reference picture missing during reorder
[h264 @ 0x3472d80] Missing reference picture, default is 65780
[h264 @ 0x34c4540] mmco: unref short failure
av_interleaved_write_frame(): Cannot allocate memory
[mp4 @ 0x295c7e0] Application provided duration: 3689347710924763697 / timestamp: 6291454 is out of range for mov/mp4 format
Segmentation fault


    


    Merging videos 2 by 2

    


    I then tried gradually merging videos into one, using multiple FFmpeg commands.

    


    # Pseudocode
final = merge(clip1, clip2)
final = merge(final, clip3)
final = merge(final, clip4)
final = merge(final, clip5)
...


    


    with each command, looking like this :

    


    ffmpeg -i 1Rbrdn1Xp.mp4 -i G7eYqdFPb.mp4 -y -filter_complex concat=n=2:v=1:a=1 -vsync 2 UMVDl9jki.mp4


    


    ffmpeg -i UMVDl9jki.mp4 -i -Xo-6ABm3.mp4 -y -filter_complex concat=n=2:v=1:a=1 -vsync 2 azE1Uombp.mp4


    


    This works but there is a loss in audio quality on the first clips, and it is slowly improving over time. I am guessing this is due to the first videos being merged more times than the last ones. You can see this effect happen in this video (weird artefacts in the voice).

    


    


    So, am I doing something wrong ?
    
Is there a way of merging a lot of videos, without running out of memory or worsening the audio quality ?

    


  • avcodec/aacenc : Avoid 0 lambda

    28 mai 2021, par Michael Niedermayer
    avcodec/aacenc : Avoid 0 lambda

    Fixes : Ticket8003
    
Fixes : CVE-2020-20453
    

    Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/aacenc.c

  • How to fix grainy recoding with ffmpeg mp4 x264 ?

    21 mars 2020, par teenserie

    I recorded the audio and video stream from a streaming with ffmpeg. when I go to re-encode the file using libx264, the video in the movements looks bad and grainy as in the image.
    Where did I go wrong ?

    Sample

    this is the code I used

    ffmpeg -i input.mp4 -c:v libx264 -c:a aac output.mp4

    and these are mediainfo of original file

        Metadata:
    
    major_brand     : isom
    
    minor_version   : 1
    
    compatible_brands: isom
    
    creation_time   : 2020-03-19T22:43:32.000000Z
    
  Duration: 00:39:51.99, start: 0.000000, bitrate: 1300 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x1080 [SAR 3:2 DAR 16:9], Closed Captions, 1268 kb/s, 59.94 fps, 59.94 tbr, 90k tbn, 59.94 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(spa): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 22 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler

    mediainfo of the file recoded

     Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf58.29.100
    
  Duration: 00:39:51.99, start: 0.000000, bitrate: 7924 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions, 7892 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(spa): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 22 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler

    How can I recode the file without loss of quality ? (sorry for my poor english)

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