ffmeg -r 20 -pattern_type glob -i "*.jpg" -c:v libx264 test.mp4

I recorded USB webcam pictures with MJPG_streamer and converted them to mp4 using ffmeg -r 20 -pattern_type glob -i "*.jpg" -c:v libx264 test.mp4 Firefox complains "video can't be played because the file is corrupt" Google Chrome and VLC have no problems playing the file. What options for ffmpeg do I need to create the mp4 files so that firefox can play them? The firefox web console says: could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_DECODE_ERR (0x806e0004) Details: RefPtr<MediaDataDecoder::DecodePromise> __cdecl mozilla::WMFMediaDataDecoder::ProcessError(HRESULT, const char *): MFTManager::Output(2):80004005 This is what mediainfo shows for the test video: Complete name : test.mp4 Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2/avc1/mp41) File size : 421 KiB Duration : 3 s 500 ms Overall bit rate : 985 kb/s Writing application : Lavf58.76.100 Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : High 4:2:2@L3 Format settings : CABAC / 4 Ref Frames Format settings, CABAC : Yes Format settings, Reference frames : 4 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 3 s 500 ms Bit rate : 981 kb/s Width : 800 pixels Height : 448 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 20.000 FPS Color space : YUV Chroma subsampling : 4:2:2 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.137 Stream size : 419 KiB (100%) Writing library : x264 core 163 r3060 5db6aa6 Encoding settings : 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=20 / 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 Color range : Full Matrix coefficients : BT.470 System B/G Codec configuration box : avcC