mpv/demux
wm4 74e62ed2d1 Revert "demux_lavf: always give libavformat the filename when probing"
This reverts commit 41243e7c4f.

This fixes image format detection. FFmpeg has an utter called "image2",
which is designed to read patterns in filenames (so you can play
something like "%*.jpg" for all jpg files in the current directory).
"image2" is not what we want; it's just broken with custom I/O like
mpv uses it, and we don't want to "accidentally" interpret filenames
as pattern. That's why mpv blacklists it.

Unfortunately, "image2" is sometimes the format that FFmpeg's probe API
returns as best match. Thus demux_lavf fails to detect the file type,
and after some more futile attempts, we end up at demux_mf, which uses
detection by file extension. (Not sure why. I guess MPlayer did that,
and foudn that sufficient.) If the file extension is wrong (which
happens a lot because apparently the world is full of idiots who don't
manage to get the most simple things right), the image "loads", but
decoding obviously fails.

There's no easy way around this. The FFmpeg API has no mechanism to
exclude a specific format from probing (like image2, which breaks stuff
for us). Out of the 5 probe functions the API provides, none can probe
a specific format or include or exclude specific formats. The main
problem is that AVInputFormat.read_probe is a private symbol.

FFmpeg itself has no problem opening such files. It turns out that it
works, because even though image2 by itself uses detection by file
extension, it uses private API to further probe the exact format. It
explicitly excludes itself to prevent recursion.

But fortunately, that also means that it's impossible to get the image2
format if no filename is passed to the prober. (No filename, no file
extension.) Apparently we pass it in because it helps in corner cases.
Until almost 3 years ago, we passed the filename only when normal
probing already failed. Restore this by this revert. It makes
incorrectly named files work. The revert also makes the (apparently
forgotten) comment above the touched line of code true again.

Yes, quite possible that this breaks some mp3s again. You can't win
with FFmpeg. Thanks FFmpeg for making us fail at opening simple image
files and/or the most widely used file format for audio.
2020-08-23 12:44:54 +02:00
..
cache.c options: change option macros and all option declarations 2020-03-18 19:52:01 +01:00
cache.h demux: add a on-disk cache 2019-09-19 20:37:05 +02:00
codec_tags.c Remove remains of Libav compatibility 2020-02-16 15:14:55 +01:00
codec_tags.h
cue.c cue: tolerate NBSP as whitespace 2020-02-03 19:13:44 +01:00
cue.h
demux.c demux: don't let --sub-create-cc-track add a track for attached pictures 2020-04-13 15:56:52 +02:00
demux.h demux: add a way to block reading after seeks 2020-02-29 21:49:00 +01:00
demux_cue.c options: change option macros and all option declarations 2020-03-18 19:52:01 +01:00
demux_disc.c stream, demux: redo origin policy thing 2019-12-20 13:00:39 +01:00
demux_edl.c ytdl_hook, edl: add fps, samplerate codec parameters 2020-02-21 14:48:23 +01:00
demux_lavf.c Revert "demux_lavf: always give libavformat the filename when probing" 2020-08-23 12:44:54 +02:00
demux_libarchive.c stream_libarchive: remember archive headers from initial open 2020-04-28 22:13:03 -07:00
demux_mf.c demux_mf: actually report errors 2020-08-22 20:46:45 +02:00
demux_mkv.c demux_mkv: add png intra support 2020-04-16 00:03:26 +02:00
demux_mkv_timeline.c demux_mkv: warn against some other aspects of mismatching codec data 2020-08-16 01:00:29 +02:00
demux_null.c
demux_playlist.c playlist: change from linked list to an array 2019-12-28 21:32:15 +01:00
demux_raw.c options: cleanup .min use for OPT_CHANNELS 2020-04-09 11:27:38 +02:00
demux_timeline.c demux_timeline: fix bad EOF reporting 2020-02-28 00:08:36 +01:00
ebml.c build: change filenames of generated files 2020-06-04 16:59:05 +02:00
ebml.h build: change filenames of generated files 2020-06-04 16:59:05 +02:00
matroska.h
packet.c Remove remains of Libav compatibility 2020-02-16 15:14:55 +01:00
packet.h demux: add a on-disk cache 2019-09-19 20:37:05 +02:00
stheader.h video, demux: rip out unused spherical metadata code 2019-10-17 22:49:26 +02:00
timeline.c stream, demux: redo origin policy thing 2019-12-20 13:00:39 +01:00
timeline.h edl: make it possible to delay-load files with multiple tracks 2020-02-21 00:19:17 +01:00