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• error when converting .flv to .mp4 using ffmpeg

  14 août 2024, par Jayce

  I converted the 1.flv file using the tool on https://convertio.co/ and still created a normal .mp4 file. However, when I use the python code, I get the error below.

  


  import os 
import subprocess 
 
def convert_flv_to_mp4(input_file, output_file):      
    try:         
        subprocess.run(["ffmpeg", "-i", input_file, "-c:v", "libx264", "-c:a", "aac", "-preset",                                                   "medium", "-crf", "23", output_file], check=True)
    except subprocess.CalledProcessError as e:         
        print(f"error {input_file} to {output_file}: {e}") 
 
if __name__ == "__main__":     
    input_file = r"C:\Users\vann4\OneDrive\Desktop\flv\1.flv"     
    output_file = r"C:\Users\vann4\OneDrive\Desktop\flv\1.mp4"          
    convert_flv_to_mp4(input_file, output_file)  


  


  [flv @ 0000016342270d80] Video codec (c) is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[flv @ 0000016342270d80] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
[flv @ 0000016342270d80] Could not find codec parameters for stream 1 (Video: none ([12][0][0][0] / 0x000C), none, 1150 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, flv, from 'C:\Users\vann4\OneDrive\Desktop\flv\1.flv':
  Metadata:
    start_time      : 1723543887483
    fp_coderate     : 1150000
    sdk_version     : 16.8.1.2
    old_link_info   : (push-rtmp-f5-sg01.tiktokcdn.com:stage:stream-2133275252817395781)n.vn-lts55c.7qmt_34825,n.my-93iclg.4epc_3521416 
    default_bitrate : 1700
    fp_vmode        : 1
    max_bitrate     : 2700
    fp_amode        : 0
    push_protocol   : rtmpq
    fp_dispatch_expr_tag:
    e_id            : 0
    stream_id       : push-rtmp-f5-sg01.tiktokcdn.com:stage:stream-2133275252817395781_uhd5b
    s_id            : 8
    h_id            : 4
    interval        : 2
    publish_time_stamp: 1723543887
    encoder         : Lavf58.45.100
    min_bitrate     : 1000
    link_info       : n.my-93iclg.4epc_3521416,n.my-93iclg.hebn_3413106,n.sg-awn1ns.n4qb_644528,n.sg-awn1ns.kq7p_4176740,n.sg-elmss9.00jt_909,n.sg-elmss9.d4b4_59676,n.vn-6tkh26.ntnt_2987,n.vn-6tkh26.vuv7_56190
    is_hardware_encode: 1
    model           : iPhone XR
    hit_node_optimize: 0
    fp_nb           : 0
    ab              : 0
    p_id            : 0
    os_version      : 17.5.1
    platform        : iOS
    qId             : {"newbitrate_ios_bT":1,"ByteAudioAUUnsplit+new_session_api+with_aec_sw_true+framesize_10ms":true,"rc_bwe_ios":4,"ios_70742354_2":2,"not_rc_bwe_ios":1,"ios_fix_low_enc_bit_vpaas_4":4,"default_config_bugfix":1,"newbitrate_ios_resolution_no480p":1}     
  Duration: 00:02:26.09, start: 0.000000, bitrate: 958 kb/s
  Stream #0:0: Audio: aac (HE-AAC), 44100 Hz, stereo, fltp, 64 kb/s
  Stream #0:1: Video: none ([12][0][0][0] / 0x000C), none, 1150 kb/s, 25 fps, 25 tbr, 1k tbn
[vist#0:1/none @ 0000016343d38c00] Decoding requested, but no decoder found for: none
Error opening output file C:\Users\vann4\OneDrive\Desktop\flv\1.mp4.
Error opening output files: Invalid argument
error C:\Users\vann4\OneDrive\Desktop\flv\1.flv to C:\Users\vann4\OneDrive\Desktop\flv\1.mp4: Command '['ffmpeg', '-i', 'C:\\Users\\vann4\\OneDrive\\Desktop\\flv\\1.flv', '-c:v', 'libx264', '-c:a', 'aac', '-preset', 'medium', '-crf', '23', 'C:\\Users\\vann4\\OneDrive\\Desktop\\flv\\1.mp4']' returned non-zero exit status 4294967274.


  


  I tried converting the .mp4 file to .avi and it's completely normal.

  


  hope everyone can help me. Thanks for reading

  


• ffmpeg crashes on crossfades between 3 clips if 2 clips coming from same input file [closed]

  14 avril 2020, par Erik

  I observed that ffmpeg 4.2.2 (macOS) crashes in particular cases of crossfades between clips, if one clip comes from file 1.dv, and two clips are cut out of file 2.dv, as shown below :

  



  ffmpeg -f lavfi -i color=black:size=720x576:duration=11:rate=25 -i 1.dv -i 2.dv -filter_complex "\
    [1:v]trim=5:10,setpts=expr=PTS-STARTPTS,yadif,fade=alpha=1:d=2:st=3:type=out,setpts=expr=PTS-STARTPTS,fifo[s5];\
    [2:v]split=2[s7][s8];\
    [s7]trim=5:10,setpts=expr=PTS-STARTPTS,yadif,fade=alpha=1:d=2:type=in,fade=alpha=1:d=2:st=6:type=out,setpts=expr=PTS-STARTPTS+(3/TB),fifo[s15];\
    [s8]trim=12:17,setpts=expr=PTS-STARTPTS,yadif,fade=alpha=1:d=2:type=in,setpts=expr=PTS-STARTPTS+(6/TB),fifo[s22];\
    [0:v][s5]overlay=eof_action=repeat[s6];\
    [s6][s15]overlay=eof_action=repeat[s16];\
    [s16][s22]overlay=eof_action=repeat[s24];\
    [1:a]atrim=5:10,asetpts=expr=PTS-STARTPTS[s26];\
    [2:a]asplit=2[s27][s28];\
    [s27]atrim=5:10,asetpts=expr=PTS-STARTPTS[s30];\
    [s28]atrim=12:17,asetpts=expr=PTS-STARTPTS[s33];\
    [s26][s30]acrossfade=d=2[s31];\
    [s31][s33]acrossfade=d=2[s36]" \
     -map "[s24]" -map "[s36]" -ab 128k -acodec aac -crf 23 -movflags faststart -preset medium -tune film -vcodec libx264 -aspect 1024:576 out.mp4 -y


  



  The order makes a difference : if the two clips from 2.dv are used first and then the clip from 1.dv is appended, everything works fine. Also, if all clips are coming from different files.

  



  ffmpeg 3.4.6 (ubuntu 18.04) shows no issues in any case.

  



  A self-compiled ffmpeg version N-97322-gb1699f4 (commit 2020-04-13) works with short clips as above, but crashes if one of the two clips taken from 2.dv is getting longer. In my tests 1500 frames (64 sec) is OK, 1700 (68 sec) leads to a segmentation fault. That is, if you replace in the command line above :

  



  

  • [s7]trim=5:10... -> [s7]trim=0:68 and accordingly

  


  • [s27]atrim=5:10... -> [s27]atrim=0:68

  


  



  Interestingly, the length of the clip taken from 1.dv does not play a role.

  



  The ffmpeg output shows about 20 times :

  



  frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x  


  



  before it continues (seg fault case) :

  



  frame=    4 fps=0.3 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   24 fps=1.6 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   25 fps=1.5 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   34 fps=1.9 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   36 fps=2.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   39 fps=2.1 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   40 fps=2.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   40 fps=2.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   40 fps=1.9 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    



  



  success case :

  



  frame=    5 fps=0.4 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   42 fps=3.2 q=28.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
frame=   53 fps=3.9 q=28.0 size=       0kB time=00:00:00.36 bitrate=   2.9kbits/s speed=0.0264x    
frame=   65 fps=4.6 q=28.0 size=       0kB time=00:00:00.84 bitrate=   1.2kbits/s speed=0.0594x 
...   


  



  Slightly older versions included in the newest MacOS builds from zeranoe.com (git-2020-04-13-59e3a9a) and evermeet.cx (N-97308-g14dd0a9057-tessus, from 2020-04-12) are working nicely - also on my production cases (longer clips).

  



  Any feedback would be appreciated !

  


• ffmpeg - extract timecode start metadata from tmcd track to a drawtext filter

  3 mars 2015, par mwjb

  I have a Quicktime file with a timecode track. I’m encoding it to a new video codec and would like to burnin the timecode from timecode track. Setting the timecode manually isn’t an option as this will be used for many files with unique starting timecodes.

  This is the current work-in-progress ffmpeg command. Obviously I need to find a way to extract the metadate:timecode value and have this start the timecode count instead of the manual entry seen below :

  ffmpeg -i infile.mov -y -c:v mjpeg -qscale:v 4 -vendor ap10 -pix_fmt yuvj422p -s 1280x720 -vf drawtext="fontfile=thefont.ttf: timecode='01\:00\:00\:00': rate=24: fontsize=40: fontcolor=white: boxcolor=black: box=1: x=1700: y=80" outfile.mov

  The Timecode metadata is there in the Stream #0:1 track, as read by ffmpeg :

  ffmpeg version 2.5.2 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jan  1 2015 20:24:48 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
  configuration: --prefix=/Volumes/tempdisk/sw --as=yasm --enable-gpl --enable-pthreads --disable-ffplay --disable-ffserver --disable-shared --enable-static --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libx265 --enable-libxvid --enable-zlib --enable-avfilter --enable-fontconfig --enable-libfreetype --enable-libass --enable-libutvideo --enable-filters --enable-postproc --enable-runtime-cpudetect
  
  libavutil      54. 15.100 / 54. 15.100
  
  libavcodec     56. 13.100 / 56. 13.100
  
  libavformat    56. 15.102 / 56. 15.102
  
  libavdevice    56.  3.100 / 56.  3.100
  
  libavfilter     5.  2.103 /  5.  2.103
  
  libswscale      3.  1.101 /  3.  1.101
  
  libswresample   1.  1.100 /  1.  1.100
  
  libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'infile.mov':
  
    Metadata:
  
  major_brand     : qt  
  
  minor_version   : 537199360
  
  compatible_brands: qt  
  
  creation_time   : 2015-03-02 22:06:00
  
  timecode        : 06:00:00:00
  
  Duration: 00:20:00.00, start: 0.000000, bitrate: 36175 kb/s
  
  Stream #0:0(eng): Video: dnxhd (AVdn / 0x6E645641), yuv422p, 1920x1080, 36175 kb/s, 24 fps, 24 tbr, 24k tbn, 24k tbc (default)
  
  Metadata:
  
    creation_time   : 2015-03-02 22:06:00
  
    handler_name    : Apple Alias Data Handler
  
    encoder         : Avid DNxHD Codec
  
  Stream #0:1(eng): Data: none (tmcd / 0x64636D74) (default)
  
  Metadata:
  
    creation_time   : 2015-03-02 22:06:58
  
    handler_name    : Apple Alias Data Handler
  
    timecode        : 06:00:00:00

  I came across this post ffmpeg and timecode from movie metadata which appeared to be on the same sort of track as I’m on. Would certainly appreciate some guidance on this. Many Thanks.