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I am trying to convert flv video to mp4 using ffmpeg.

I have checked questions about converting from flv like this one and this one but it didn't help.

Commands I have executed:

ffmpeg -i input.flv -c:v libx264 output.mp4

also:

ffmpeg -i input.flv -c:v libx264 -crf 19 -strict experimental output.mp4

also:

ffmpeg -i input.flv -codec copy output.mp4

also:

ffmpeg -i input.flv -c copy -copyts output.mp4

also:

ffmpeg -i input.flv -vcodec libvpx -acodec libvorbis output.mp4

also:

ffmpeg -analyzeduration 2147483647 -probesize 2147483647 -i input.flv -c:v libx264 output.mp4

I get below error from all above variants:

[flv @ 0xaaab0f4ec060] Packet mismatch 1703445535 198421 198574

[flv @0xaaab0f4ec060] Could not find codec parameters for stream 0 (Video: h264, none): unspecified size Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options

Input #0, flv, from 'input.flv': Duration: 00:00:07.12, start: 0.000000, bitrate: 16070 kb/s Stream #0:0: Video: h264, none, 1k tbr, 1k tbn

Output #0, mp4, to 'output.mp4': Output file #0 does not contain any stream

Please note that I cannot reproduce the video using vlc. I managed to reproduce the video after downloading FLV-Media-Player

I think my video needs some kind of pre-processing but have no idea how to go about this.

UPDATE:

Using MediaInfoOnline tool to process my flv video I got below information (no errors reported from the tool):

General
Complete name                            : input.flv
Format                                   : Flash Video
File size                                : 12.2 MiB
Overall bit rate mode                    : Constant
Video
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4
Format settings                          : CABAC / 1 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 1 frame
Codec ID                                 : 7
Bit rate mode                            : Constant
Bit rate                                 : 16.0 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Standard                                 : NTSC
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Color range                              : Full
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
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  • You could try ffmpeg -analyzeduration 2147483647 -probesize 2147483647 -i input.flv -c:v libx264 output.mp4 which might work out here ?? Commented Sep 16, 2024 at 9:32
  • 1
    @Prem I have tried this as well. Same result. Commented Sep 16, 2024 at 12:27
  • (1) You could try online tools like mediaarea.net/MediaInfoOnline to check what is wrong with the media. (2) You could try to make the FLV Player make a copy with minor modifications , where the error may get automatically rectified, Commented Sep 16, 2024 at 15:21
  • 1
    It is then definitely confirmed that your media file is faulty. It is not related to ffmpeg. You could try converting with handbrake tool. Commented Sep 18, 2024 at 16:02
  • 1
    Best Course Of Action : [[1]] you could try to make flv player save a copy with minor modifications ( size , quality , volume , some thing else ) where that copy will not have the error , hence you can convert that later. [[2]] you could record the output of flv player to make a new media file. Commented Sep 20, 2024 at 7:36

1 Answer 1

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1

I finally managed to get a working solution. I first installed flvmeta

$ git clone https://github.com/noirotm/flvmeta.git
$ cd flvmeta
$ cmake .
$ make
$ sudo make install

I then executed following command:

$ flvmeta -t -f input.flv output_meta.flv

After this, following command works as expected:

$ ffmpeg -i output_meta.flv -c:v libx264 -crf 19 -strict experimental output.mp4
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