[FFmpeg-user] Lossless JPEG encoding

[Tom Sparks]

there is no Lossless JPEG cmpresstion in libjpeg

if you are dealing with single images use mozjpeg[1]

[1] https://github.com/mozilla/mozjpeg

On Thu, 3 Apr 2025 at 18:20, Gianluca Cannata <gcannata23 at gmail.com> wrote:
>
> What is the right command to produce a Lossless JPEG file ?
>
> magick wizard: ppm:- | ffmpeg -v trace -i - -map 0:v -c:v ljpeg -b:v 1M
> -pred median -f mjpeg -y wizard.jpg
> ffmpeg version N-119135-g1722f08acf Copyright (c) 2000-2025 the FFmpeg
> developers
>   built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
>   configuration: --prefix=/usr --disable-static --enable-shared
> --enable-gpl --enable-version3 --disable-doc --disable-avdevice
> --enable-swresample --disable-swscale --disable-postproc --disable-network
> --disable-everything --enable-protocol='fd, file, subfile, pipe'
> --enable-demuxer='image_jpeg_pipe, mjpeg, mpjpeg, smjpeg, image_ppm_pipe'
> --enable-muxer='mjpeg, mpjpeg, smjpeg' --enable-decoder='mjpeg, ppm'
> --enable-encoder='ljpeg, mjpeg, ppm' --disable-ffplay
>   libavutil      60.  0.100 / 60.  0.100
>   libavcodec     62.  0.101 / 62.  0.101
>   libavformat    62.  0.100 / 62.  0.100
>   libavfilter    11.  0.100 / 11.  0.100
>   libswresample   6.  0.100 /  6.  0.100
> Splitting the commandline.
> Reading option '-v' ... matched as option 'v' (set logging level) with
> argument 'trace'.
> Reading option '-i' ... matched as input url with argument '-'.
> Reading option '-map' ... matched as option 'map' (set input stream
> mapping) with argument '0:v'.
> Reading option '-c:v' ... matched as option 'c' (select encoder/decoder
> ('copy' to copy stream without reencoding)) with argument 'ljpeg'.
> Reading option '-b:v' ... matched as option 'b' (video bitrate (please use
> -b:v)) with argument '1M'.
> Reading option '-pred' ... matched as AVOption 'pred' with argument
> 'median'.
> Reading option '-f' ... matched as option 'f' (force container format
> (auto-detected otherwise)) with argument 'mjpeg'.
> Reading option '-y' ... matched as option 'y' (overwrite output files) with
> argument '1'.
> Reading option 'wizard.jpg' ... matched as output url.
> Finished splitting the commandline.
> Parsing a group of options: global .
> Applying option v (set logging level) with argument trace.
> Applying option y (overwrite output files) with argument 1.
> Successfully parsed a group of options.
> Parsing a group of options: input url -.
> Successfully parsed a group of options.
> Opening an input file: -.
> [AVFormatContext @ 0x5ea397c38a40] Opening 'fd:' for reading
> [fd @ 0x5ea397c39200] Setting default whitelist 'crypto,data'
> Probing ppm_pipe score:52 size:2048
> [ppm_pipe @ 0x5ea397c38a40] Format ppm_pipe probed with size=2048 and
> score=52
> [ppm_pipe @ 0x5ea397c38a40] Before avformat_find_stream_info() pos: 0 bytes
> read:16384 seeks:0 nb_streams:1
> [ppm_pipe @ 0x5ea397c38a40] parser not found for codec ppm, packets or
> times may be invalid.
> [ppm_pipe @ 0x5ea397c38a40] stream 0: start_time: NOPTS duration: NOPTS
> [ppm_pipe @ 0x5ea397c38a40] format: start_time: NOPTS duration: NOPTS
> (estimate from bit rate) bitrate=0 kb/s
> [ppm_pipe @ 0x5ea397c38a40] Could not find codec parameters for stream 0
> (Video: ppm, 1 reference frame, none): unspecified size
> Consider increasing the value for the 'analyzeduration' (0) and 'probesize'
> (5000000) options
> [ppm_pipe @ 0x5ea397c38a40] After avformat_find_stream_info() pos: 0 bytes
> read:16384 seeks:0 frames:0
> Input #0, ppm_pipe, from 'fd:':
>   Duration: N/A, bitrate: N/A
>   Stream #0:0, 0, 1/25: Video: ppm, 1 reference frame, none, 25 fps, 25
> tbr, 25 tbn
> Successfully opened the file.
> Parsing a group of options: output url wizard.jpg.
> Applying option map (set input stream mapping) with argument 0:v.
> Parsing stream specifier: v
> Parsed media type: video; remainder:
> Applying option c:v (select encoder/decoder ('copy' to copy stream without
> reencoding)) with argument ljpeg.
> Parsing stream specifier: v
> Parsed media type: video; remainder:
> Applying option b:v (video bitrate (please use -b:v)) with argument 1M.
> Applying option f (force container format (auto-detected otherwise)) with
> argument mjpeg.
> Successfully parsed a group of options.
> Opening an output file: wizard.jpg.
> [out#0/mjpeg @ 0x5ea397c3b5c0] Adding streams from explicit maps...
> [vost#0:0/ljpeg @ 0x5ea397c3c0c0] Created video stream from input stream 0:0
> Parsing stream specifier: v
> Parsed media type: video; remainder:
> [file @ 0x5ea397c48040] Setting default whitelist 'file,crypto,data'
> Successfully opened the file.
> Stream mapping:
>   Stream #0:0 -> #0:0 (ppm (native) -> ljpeg (native))
> [vost#0:0/ljpeg @ 0x5ea397c3c0c0] Starting thread...
> [vf#0:0 @ 0x5ea397c3d680] Starting thread...
> [vist#0:0/ppm @ 0x5ea397c3ae40] [dec:ppm @ 0x5ea397c43880] Starting
> thread...
> [in#0/ppm_pipe @ 0x5ea397c386c0] Starting thread...
> [in#0/ppm_pipe @ 0x5ea397c386c0] EOF while reading input
> [in#0/ppm_pipe @ 0x5ea397c386c0] Terminating thread with return code 0
> (success)
> [vist#0:0/ppm @ 0x5ea397c3ae40] [dec:ppm @ 0x5ea397c43880] Decoder thread
> received EOF packet
> [vist#0:0/ppm @ 0x5ea397c3ae40] [dec:ppm @ 0x5ea397c43880] Decoder returned
> EOF, finishing
> [vist#0:0/ppm @ 0x5ea397c3ae40] [dec:ppm @ 0x5ea397c43880] Terminating
> thread with return code 0 (success)
> [vf#0:0 @ 0x5ea397c3d680] Cannot determine format of input 0:0 after EOF
> [vf#0:0 @ 0x5ea397c3d680] Task finished with error code: -1094995529
> (Invalid data found when processing input)
> [vf#0:0 @ 0x5ea397c3d680] Terminating thread with return code -1094995529
> (Invalid data found when processing input)
> [vost#0:0/ljpeg @ 0x5ea397c3c0c0] [enc:ljpeg @ 0x5ea397c3cb00] Encoder
> thread received EOF
> [vost#0:0/ljpeg @ 0x5ea397c3c0c0] [enc:ljpeg @ 0x5ea397c3cb00] Could not
> open encoder before EOF
> [vost#0:0/ljpeg @ 0x5ea397c3c0c0] Task finished with error code: -22
> (Invalid argument)
> [vost#0:0/ljpeg @ 0x5ea397c3c0c0] Terminating thread with return code -22
> (Invalid argument)
> [out#0/mjpeg @ 0x5ea397c3b5c0] Nothing was written into output file,
> because at least one of its streams received no packets.
> frame=    0 fps=0.0 q=0.0 Lsize=       0KiB time=N/A bitrate=N/A speed=N/A
>
> [AVIOContext @ 0x5ea397c47f00] Statistics: 0 bytes written, 0 seeks, 0
> writeouts
> [in#0/ppm_pipe @ 0x5ea397c386c0] Input file #0 (fd:):
> [in#0/ppm_pipe @ 0x5ea397c386c0]   Input stream #0:0 (video): 0 packets
> read (0 bytes); 0 frames decoded; 0 decode errors;
> [in#0/ppm_pipe @ 0x5ea397c386c0]   Total: 0 packets (0 bytes) demuxed
> [AVIOContext @ 0x5ea397c495c0] Statistics: 16384 bytes read, 0 seeks
> Conversion failed!
>
> Gianluca
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